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Kim J, Nam KB, Ha HP. Comparative study of HSO A-/SO A2- versus H 3-BPO 4B- functionalities anchored on TiO 2-supported antimony oxide-vanadium oxide-cerium oxide composites for low-temperature NO X activation. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125780. [PMID: 33865113 DOI: 10.1016/j.jhazmat.2021.125780] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/11/2021] [Accepted: 03/26/2021] [Indexed: 06/12/2023]
Abstract
TiO2-supported antimony oxide-vanadium oxide-cerium oxide (SVC) imparts Lewis acidic (L)/Brönsted acidic (B) sites, labile (Oα)/mobile oxygens (OM), and oxygen vacancies (OV) for selective catalytic NOX reduction (SCR). However, these species are harmonious occasionally, readily poisoned by H2O/sulfur/phosphorus/carbon, thus limiting SCR performance of SVC. Herein, a synthetic means is reported for immobilizing HSOA-/SOA2- (A= 3-4) or H3-BPO4B- (B= 1-3) on the L sites of SVC to form SVC-S and SVC-P. HSOA-/SOA2-/H3-BPO4B- acted as additional B sites with distinct characteristics, altered the properties of Oα/OM/OV species, thereby affecting the SCR activities and performance of SVC-S and SVC-P. SVC-P activated Langmuir-Hinshelwood-typed SCR better than SVC-S, as demonstrated by a greater Oα-directed pre-factor and smaller binding energy between Oα and NO. Meanwhile, SVC-S provided a larger B-directed pre-factor, thereby outperforming SVC-P in activating Eley-Rideal-typed SCR that dictated the overall SCR activities. Compared with SVC-S, SVC-P contained fewer OV species, yet, had higher OM mobility, thus enhancing the overall redox cycling feature, while providing greater Brönsted acidity. Consequently, the resistance of SVC-P to H2O or soot were greater than or similar to that of SVC-S. Conversely, SVC-S revealed greater tolerance to hydro-thermal aging and SO2 than SVC-P. This study highlights the pros and cons of HSOA-/SOA2-/H3-BPO4B- functionalities in tailoring the properties of metal oxides in use as SCR catalysts.
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Affiliation(s)
- Jongsik Kim
- Extreme Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea.
| | - Ki Bok Nam
- Extreme Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea.
| | - Heon Phil Ha
- Extreme Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, South Korea.
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Huizenga C, Hratchian HP, Jarrold CC. Lanthanide Oxides: From Diatomics to High-Spin, Strongly Correlated Homo- and Heterometallic Clusters. J Phys Chem A 2021; 125:6315-6331. [PMID: 34265204 DOI: 10.1021/acs.jpca.1c04253] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Small lanthanide (Ln) oxide clusters present both experimental and theoretical challenges because of their partially filled, core-like 4f n orbitals, a feature that results in a plethora of close-lying and fundamentally similar electronic states. These clusters provide a bottom-up approach toward understanding the electronic structure of defective or doped bulk material but also can offer a challenge to the theorists to find a method robust enough to capture electronic structure patterns that emerge from within the 4f n (0 < n < 14) series. In this Feature Article, we explore the electronic structures of small lanthanide oxide clusters that deviate from bulk stoichiometry using anion photoelectron spectroscopy and supporting density functional theory calculations. We will describe the evolution of electronic structure with oxidation and how LnxOy- cluster reactivities can be correlated with specific Ln-local orbital occupancies. These strongly correlated systems offer additional insights into how interactions between electrons and electronically complex neutrals can lead to detachment transitions that lie outside of the sudden one-electron detachment approximation generally assumed in anion photoelectron spectroscopy. With a better understanding of how we can control nominally forbidden transitions to sample an array of spin states, we suggest that more in-depth studies on the magnetic states of these systems can be explored. Extending these studies to other Ln-based materials with hidden magnetic phases, along with sequentially ligated single molecule magnets, could advance current understanding of these systems.
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Affiliation(s)
- Caleb Huizenga
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Hrant P Hratchian
- Department of Chemistry and Chemical Biology, University of California, Merced, 5200 North Lake Road, Merced, California 95343, United States
| | - Caroline Chick Jarrold
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
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Sun Y, Cop P, Djerdj I, Guo X, Weber T, Khalid O, Guo Y, Smarsly BM, Over H. CeO2 Wetting Layer on ZrO2 Particle with Sharp Solid Interface as Highly Active and Stable Catalyst for HCl Oxidation Reaction. ACS Catal 2019. [DOI: 10.1021/acscatal.9b03482] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yu Sun
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Pascal Cop
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Zentrum für Materialforschung, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Igor Djerdj
- Department of Chemistry, J. J. Strossmayer University of Osijek, Ulica cara Hadrijana 8/a, HR-31000 Osijek, Croatia
| | - Xiaohan Guo
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Tim Weber
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Zentrum für Materialforschung, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Omeir Khalid
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Zentrum für Materialforschung, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Yanglong Guo
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, PR China
| | - Bernd M. Smarsly
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Zentrum für Materialforschung, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
| | - Herbert Over
- Physikalisch-Chemisches Institut, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
- Zentrum für Materialforschung, Justus Liebig University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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Xi Y, Yang W, Ammal SC, Lauterbach J, Pagan-Torres Y, Heyden A. Mechanistic study of the ceria supported, re-catalyzed deoxydehydration of vicinal OH groups. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01782d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Deoxydehydration (DODH) is an emerging biomass deoxygenation process whereby vicinal OH groups are removed.
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Affiliation(s)
- Yongjie Xi
- Department of Chemical Engineering
- University of South Carolina
- Columbia
- USA
| | - Wenqiang Yang
- Department of Chemical Engineering
- University of South Carolina
- Columbia
- USA
| | | | - Jochen Lauterbach
- Department of Chemical Engineering
- University of South Carolina
- Columbia
- USA
| | - Yomaira Pagan-Torres
- Department of Chemical Engineering
- University of Puerto Rico-Mayaguez Campus
- Mayaguez
- Puerto Rico 00681-9000
| | - Andreas Heyden
- Department of Chemical Engineering
- University of South Carolina
- Columbia
- USA
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