1
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Nakasaka Y, Kushima K, Yasumura S, Shimizu KI, Totani K, Shibata G, Masuda T. Experimental studies on intracrystalline diffusion of NO and NH3 in Cu-CHA. Catal Today 2022. [DOI: 10.1016/j.cattod.2022.06.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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2
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Yoshioka T, Iyoki K, Hotta Y, Kamimura Y, Yamada H, Han Q, Kato T, Fisher CAJ, Liu Z, Ohnishi R, Yanaba Y, Ohara K, Sasaki Y, Endo A, Takewaki T, Sano T, Okubo T, Wakihara T. Dealumination of small-pore zeolites through pore-opening migration process with the aid of pore-filler stabilization. SCIENCE ADVANCES 2022; 8:eabo3093. [PMID: 35731864 PMCID: PMC9216521 DOI: 10.1126/sciadv.abo3093] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Small-pore zeolites are gaining increasing attention owing to their superior catalytic performance. Despite being critical for the catalytic activity and lifetime, postsynthetic tuning of bulk Si/Al ratios of small-pore zeolites has not been achieved with well-preserved crystallinity because of the limited mass transfer of aluminum species through narrow micropores. Here, we demonstrate a postsynthetic approach to tune the composition of small-pore zeolites using a previously unexplored strategy named pore-opening migration process (POMP). Acid treatment assisted by stabilization of the zeolite framework by organic cations in pores is proven to be successful for the removal of Al species from zeolite via POMP. Furthermore, the dealuminated AFX zeolite is treated via defect healing, which yields superior hydrothermal stability against severe steam conditions. Our findings could facilitate industrial applications of small-pore zeolites via aluminum content control and defect healing and could elucidate the structural reconstruction and arrangement processes for inorganic microporous materials.
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Affiliation(s)
- Tatsushi Yoshioka
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kenta Iyoki
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan
- Corresponding author. (K.I.); (T.W.)
| | - Yuusuke Hotta
- Mitsubishi Chemical Corporation, Science and Innovation Center, Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
| | - Yoshihiro Kamimura
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5-2, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Hiroki Yamada
- Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Qiao Han
- Mitsubishi Chemical Corporation, Science and Innovation Center, Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
| | - Takeharu Kato
- Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Craig A. J. Fisher
- Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Zhendong Liu
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Ryohji Ohnishi
- Mitsubishi Chemical Corporation, Science and Innovation Center, Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
| | - Yutaka Yanaba
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Koji Ohara
- Japan Synchrotron Radiation Research Institute/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Yukichi Sasaki
- Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan
| | - Akira Endo
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5-2, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Takahiko Takewaki
- Mitsubishi Chemical Corporation, Science and Innovation Center, Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
| | - Tsuneji Sano
- Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tatsuya Okubo
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Toru Wakihara
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- Institute of Engineering Innovation, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
- Corresponding author. (K.I.); (T.W.)
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3
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Kubota H, Liu C, Amada T, Kon K, Toyao T, Maeno Z, Ueda K, Satsuma A, Tsunoji N, Sano T, Shimizu K. In situ/operando spectroscopic studies on NH3–SCR reactions catalyzed by a phosphorus-modified Cu-CHA zeolite. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.07.084] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Kubota H, Toyao T, Maeno Z, Inomata Y, Murayama T, Nakazawa N, Inagaki S, Kubota Y, Shimizu KI. Analogous Mechanistic Features of NH 3-SCR over Vanadium Oxide and Copper Zeolite Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02860] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hiroe Kubota
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Zen Maeno
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Yusuke Inomata
- Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
| | - Toru Murayama
- Research Center for Hydrogen Energy-Based Society, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
- Yantai Key Laboratory of Gold Catalysis and Engineering, Shandong Applied Research Center of Gold Nanotechnology (Au-SDARC), School of Chemistry & Chemical Engineering, Yantai University, Yantai 264005, China
| | - Naoto Nakazawa
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Satoshi Inagaki
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yoshihiro Kubota
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
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5
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Ohata Y, Ohnishi T, Moteki T, Ogura M. High NH 3-SCR reaction rate with low dependence on O 2 partial pressure over Al-rich Cu-*BEA zeolite. RSC Adv 2021; 11:10381-10384. [PMID: 35423523 PMCID: PMC8695709 DOI: 10.1039/d1ra00943e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/05/2021] [Indexed: 11/21/2022] Open
Abstract
Dependence of NH3-SCR reaction rate on O2 partial pressure was investigated at 473 K over Cu ion-exchanged MOR, MFI, CHA and *BEA zeolites with varying “Cu density in micropores”. Among the zeolites, Cu–*BEA zeolite demonstrated promising potential as an effective catalyst for NH3-SCR over a wide range of O2 partial pressure. It was revealed that Al-rich Cu–*BEA zeolite exhibit high reaction rate for NH3-SCR at 473 K in low PO2 reaction condition.![]()
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Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan
| | - Takeshi Ohnishi
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan
| | - Takahiko Moteki
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan .,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University Katsura Kyoto 615-8520 Japan
| | - Masaru Ogura
- Institute of Industrial Science, The University of Tokyo Komaba, Meguro Tokyo 153-8505 Japan .,Elements Strategy Initiative for Catalysts and Batteries, Kyoto University Katsura Kyoto 615-8520 Japan
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6
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AFX Zeolite for Use as a Support of NH3-SCR Catalyst Mining through AICE Joint Research Project of Industries–Academia–Academia. Catalysts 2021. [DOI: 10.3390/catal11020163] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This paper introduces a joint industries–academia–academia research project started by researchers in several automobile companies and universities working on a single theme. Our first target was to find a zeolite for NH3-SCR, that is, zeolite mining. Zeolite AFX, having the same topology of SSZ-16, was found to be the one of the zeolites. SSZ-16 can be synthesized by using an organic structure-directing agent such as 1,1′-tetramethylenebis(1-azonia-4-azabicyclo[2.2.2]octane; Dab-4, resulting in the formation of Al-rich SSZ-16 with Si/Al below five. We found that AFX crystallized by use of N,N,N′,N′-tetraethylbicyclo[2.2.2]oct-7-ene-2,3:5,6-dipyrrolidinium ion, called TEBOP in this study, had the same analog as SSZ-16 having Si/Al around six and a smaller particle size than SSZ-16. The AFX demonstrated a high performance for NH3-SCR as the zeolitic support to load a large number of divalent Cu ionic species with high hydrothermal stability.
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7
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Onishi M, Tsunoji N, Sadakane M, Sano T. Synthesis of Phosphorus-Modified AFX Zeolite by the Hydrothermal Conversion of Tetraalkylphosphonium Hydroxide-Impregnated FAU Zeolite. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200224] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Misae Onishi
- Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Nao Tsunoji
- Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Masahiro Sadakane
- Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Tsuneji Sano
- Applied Chemistry Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
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8
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Yoshioka T, Liu Z, Iyoki K, Chokkalingam A, Yonezawa Y, Hotta Y, Ohnishi R, Matsuo T, Yanaba Y, Ohara K, Takewaki T, Sano T, Okubo T, Wakihara T. Ultrafast and continuous-flow synthesis of AFX zeolite via interzeolite conversion of FAU zeolite. REACT CHEM ENG 2021. [DOI: 10.1039/d0re00219d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Continuous-flow synthesis of AFX zeolite is achieved with the residence time of 10 min, using FAU zeolite as the silica and alumina source, and acid-leached seeds which promote secondary nucleation of AFX.
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9
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Zhao P, Boekfa B, Shimizu KI, Ogura M, Ehara M. Selective catalytic reduction of NO with NH 3 over Cu-exchanged CHA, GME, and AFX zeolites: a density functional theory study. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02342f] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Density functional theory calculations have been applied to study the selectivity caused by the cage size during the selective catalytic reduction of NO by NH3 over the Cu-exchanged zeolites with cha, gme, and aft cages.
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Affiliation(s)
- Pei Zhao
- Research Center for Computational Science
- Institute for Molecular Science
- Okazaki
- Japan
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
| | - Bundet Boekfa
- Department of Chemistry
- Faculty of Liberal Arts and Science
- Kasetsart University, Kamphaengsaen Campus
- Thailand
| | - Ken-ichi Shimizu
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
- Kyoto University
- Kyoto 615-8245
- Japan
- Institute for Catalysis
| | - Masaru Ogura
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
- Kyoto University
- Kyoto 615-8245
- Japan
- Institute of Industrial Science
| | - Masahiro Ehara
- Research Center for Computational Science
- Institute for Molecular Science
- Okazaki
- Japan
- Element Strategy Initiative for Catalysts and Batteries (ESICB)
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10
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Liu C, Kubota H, Amada T, Toyao T, Maeno Z, Ogura M, Nakazawa N, Inagaki S, Kubota Y, Shimizu KI. Selective catalytic reduction of NO over Cu-AFX zeolites: mechanistic insights from in situ/ operando spectroscopic and DFT studies. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00282a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ/operando spectroscopic experiments and DFT calculations unravel the redox mechanism of NH3-SCR over Cu-AFX zeolites.
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Affiliation(s)
- Chong Liu
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Hiroe Kubota
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takehiro Amada
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takashi Toyao
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Zen Maeno
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Masaru Ogura
- Elements Strategy Initiative for Catalysts and Batteries
- Kyoto University
- Kyoto 615-8520
- Japan
- Institute of Industrial Science
| | - Naoto Nakazawa
- Division of Materials Science and Chemical Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Satoshi Inagaki
- Division of Materials Science and Chemical Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Yoshihiro Kubota
- Division of Materials Science and Chemical Engineering
- Yokohama National University
- Yokohama 240-8501
- Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
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11
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Ohata Y, Kubota H, Toyao T, Shimizu KI, Ohnishi T, Moteki T, Ogura M. Kinetic and spectroscopic insights into the behaviour of Cu active site for NH 3-SCR over zeolites with several topologies. Catal Sci Technol 2021. [DOI: 10.1039/d0cy01838d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zeolite topology has a great effect on the dependence of NH3-SCR rates over Cu–zeolites at 473 K on Cu density. It is revealed by the time-resolved UV-vis measurements that zeolites mainly affect the oxidation property of Cu ion by O2.
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Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Hiroe Kubota
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takashi Toyao
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Ken-ichi Shimizu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Takeshi Ohnishi
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
| | - Takahiko Moteki
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Masaru Ogura
- Institute of Industrial Science
- The University of Tokyo
- Tokyo 153-8505
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
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12
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Understanding the high hydrothermal stability and NH3-SCR activity of the fast-synthesized ERI zeolite. J Catal 2020. [DOI: 10.1016/j.jcat.2020.08.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Tanigawa T, Tsunoji N, Sadakane M, Sano T. High-quality synthesis of a nanosized CHA zeolite by a combination of a starting FAU zeolite and aluminum sources. Dalton Trans 2020; 49:9972-9982. [PMID: 32484170 DOI: 10.1039/d0dt01013h] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chabazite (CHA zeolite) was synthesized using high-silica faujasite (FAU) zeolites with a Si/Al ratio of 93, an additional alumina source (aluminum hydroxide) combined with seed crystals, and N,N,N-trimethyl-1-adamantammonium hydroxide. We compared the crystallization behavior of the starting material (HSY + Al) with that of other combinations of silica/alumina sources (high-silica and low-silica FAU, fumed silica, and aluminum hydroxide). HSY + Al rapidly yielded nanosized CHA zeolites with a crystal size of approximately 70 nm, exhibited high product crystallinity and high yield and offered a wide synthesis window. A combination of analytic experiments using electrospray-ionization mass spectrometry and nuclear magnetic resonance (NMR) suggested that in the early stage, the pre-introduced CHA seeds provide a crystal nucleus and the FAU zeolites decompose to form oligomer species in the liquid phase. Meanwhile, aluminum hydroxide retains its solid phase. Subsequent crystallization of the zeolites is accelerated by the liquid silicate oligomer and solid aluminate sources, resulting in a high yield and rapid synthesis of nanosized CHA zeolites. We observed that phosphorus-modified CHA zeolites synthesized using HSY + Al perform well as a catalyst for ethanol conversion reactions. Controlled Si/Al ratios and additional phosphorus modifications improve catalytic durability, thereby exhibiting a higher propylene yield from the reaction within the zeolite pore system.
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Affiliation(s)
- Takuya Tanigawa
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
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14
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Liu C, Kubota H, Amada T, Kon K, Toyao T, Maeno Z, Ueda K, Ohyama J, Satsuma A, Tanigawa T, Tsunoji N, Sano T, Shimizu K. In Situ
Spectroscopic Studies on the Redox Cycle of NH
3
−SCR over Cu−CHA Zeolites. ChemCatChem 2020. [DOI: 10.1002/cctc.202000024] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chong Liu
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
| | - Hiroe Kubota
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
| | - Takehiro Amada
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
| | - Kenichi Kon
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
| | - Takashi Toyao
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
- Elements Strategy Initiative for Catalysts and BatteriesKyoto University Katsura, Kyoto 615-8520 Japan
| | - Zen Maeno
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
| | - Kakuya Ueda
- Department of Materials Chemistry, Graduate School of EngineeringNagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Junya Ohyama
- Elements Strategy Initiative for Catalysts and BatteriesKyoto University Katsura, Kyoto 615-8520 Japan
- Faculty of Advanced Science and TechnologyKumamoto University 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555 Japan
| | - Atsushi Satsuma
- Elements Strategy Initiative for Catalysts and BatteriesKyoto University Katsura, Kyoto 615-8520 Japan
- Department of Materials Chemistry, Graduate School of EngineeringNagoya University Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Takuya Tanigawa
- Department of Applied Chemistry, Graduate School of EngineeringHiroshima University Higashi-Hiroshima 739-8527 Japan
| | - Nao Tsunoji
- Department of Applied Chemistry, Graduate School of EngineeringHiroshima University Higashi-Hiroshima 739-8527 Japan
| | - Tsuneji Sano
- Department of Applied Chemistry, Graduate School of EngineeringHiroshima University Higashi-Hiroshima 739-8527 Japan
| | - Ken‐ichi Shimizu
- Institute for CatalysisHokkaido University N-21, W-10 Sapporo 001-0021 Japan
- Elements Strategy Initiative for Catalysts and BatteriesKyoto University Katsura, Kyoto 615-8520 Japan
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15
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Kubota H, Liu C, Toyao T, Maeno Z, Ogura M, Nakazawa N, Inagaki S, Kubota Y, Shimizu KI. Formation and Reactions of NH4NO3 during Transient and Steady-State NH3-SCR of NOx over H-AFX Zeolites: Spectroscopic and Theoretical Studies. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05151] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hiroe Kubota
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Chong Liu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Takashi Toyao
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
| | - Zen Maeno
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
| | - Masaru Ogura
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Naoto Nakazawa
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Satoshi Inagaki
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Yoshihiro Kubota
- Division of Materials Science and Chemical Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo 001-0021, Japan
- Elements Strategy Initiative for Catalysts and Batteries, Kyoto University, Katsura, Kyoto 615-8520, Japan
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16
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Liu C, Kubota H, Toyao T, Maeno Z, Shimizu KI. Mechanistic insights into the oxidation of copper(i) species during NH3-SCR over Cu-CHA zeolites: a DFT study. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00379d] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
DFT calculations suggest that Cu(i) oxidation with O2 as the sole oxidant plays a major role in the oxidation half cycle of standard NH3-SCR over Cu-CHA zeolites.
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Affiliation(s)
- Chong Liu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Hiroe Kubota
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Takashi Toyao
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
| | - Zen Maeno
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Ken-ichi Shimizu
- Institute for Catalysis
- Hokkaido University
- Sapporo 001-0021
- Japan
- Elements Strategy Initiative for Catalysts and Batteries
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17
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Ohata Y, Nishitoba T, Yokoi T, Moteki T, Ogura M. Effect of Zeolite Topology on Cu Active Site Formation for NO Direct Decomposition. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2019. [DOI: 10.1246/bcsj.20190216] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yusuke Ohata
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
| | - Toshiki Nishitoba
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Toshiyuki Yokoi
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
- PRESTO, JST, Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8503, Japan
| | - Takahiko Moteki
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan
| | - Masaru Ogura
- Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan
- Unit of Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Katsura, Nishikyo, Kyoto 615-8510, Japan
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18
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Synthesis of ZSM-5 via organotemplate-free and dry gel conversion method: Investigating the effects of experimental parameters. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120969] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Shibata G, Eijima W, Koiwai R, Shimizu KI, Nakasaka Y, Kobashi Y, Kubota Y, Ogura M, Kusaka J. NH3-SCR by monolithic Cu-ZSM-5 and Cu-AFX catalysts: Kinetic modeling and engine bench tests. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.06.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Nakasaka Y, Kanda T, Shimizu KI, Kon K, Shibata G, Masuda T. Micropore diffusivities of NO and NH3 in Cu-ZSM-5 and their effect on NH3-SCR. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.06.056] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Chokkalingam A, Chaikittisilp W, Iyoki K, Keoh SH, Yanaba Y, Yoshikawa T, Kusamoto T, Okubo T, Wakihara T. Ultrafast synthesis of AFX-Type zeolite with enhanced activity in the selective catalytic reduction of NOx and hydrothermal stability. RSC Adv 2019; 9:16790-16796. [PMID: 35516373 PMCID: PMC9064439 DOI: 10.1039/c9ra02787d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Accepted: 05/22/2019] [Indexed: 11/21/2022] Open
Abstract
Shortening the synthesis time of SSZ-16 (AFX type) zeolite from several days to 2 h has been achieved using an ultrafast synthesis route involving N,N,N′,N′-tetraethylbicyclo[2.2.2]oct-7-ene-2,3:5,6-dipyrrolidinium (TEBOP) as an organic structure-directing agent (OSDA) in a tubular reactor assisted by seed crystals. Recently, copper exchanged SSZ-16 has been looked upon as one of the few equivalents to SSZ-13 for the selective catalytic reduction of NOx with ammonia (NH3-SCR) from automobile exhausts. Hydrothermal stability is one of the crucial properties for any zeolites that compete for automobile applications. All the samples prepared were analyzed using sophisticated physio-chemical techniques and those prepared from TEBOP were subjected to SCR of NOx reactions. The rapid crystal growth induced by high synthesis temperature bestowed the ultrafast prepared SSZ-16 with high crystallinity and hydrothermal stability as well as enhanced SCR of NOx activity even when aged at 800 °C. Compared to 1,1′-(1,4-butanediyl)bis-4-aza-1-azoniabicyclo[2.2.2]octane dibromide (DABCO), TEBOP was found to be desirable as an OSDA for high crystallinity and hydrothermal stability. SSZ-16 (AFX-type) zeolite prepared in 2 h, so far the fastest, shows enhanced hydrothermal-stability and activity in selective-catalytic-reduction of NOx.![]()
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Affiliation(s)
- Anand Chokkalingam
- Department of Chemical System Engineering
- The University of Tokyo
- Tokyo
- Japan
| | | | - Kenta Iyoki
- Department of Chemical System Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Sye Hoe Keoh
- Department of Chemical System Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Yutaka Yanaba
- Institute of Industrial Science
- The University of Tokyo
- Tokyo
- Japan
| | | | - Tetsuro Kusamoto
- Department of Chemistry
- Graduate School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Tatsuya Okubo
- Department of Chemical System Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Toru Wakihara
- Department of Chemical System Engineering
- The University of Tokyo
- Tokyo
- Japan
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22
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Peng C, Liu Z, Okubo T, Wakihara T. Fast Synthesis of SSZ-24: A Pure Silica Zeolite with AFI Framework. CHEM LETT 2018. [DOI: 10.1246/cl.180112] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ce Peng
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Zhendong Liu
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tatsuya Okubo
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Toru Wakihara
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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