1
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Ma YP, Wang GC. Comparative theoretical study of CO 2 activation on clean and potassium-preadsorbed low index surfaces of transition metals. J Mol Model 2023; 29:375. [PMID: 37964098 DOI: 10.1007/s00894-023-05784-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 11/07/2023] [Indexed: 11/16/2023]
Abstract
CONTEXT The efficient catalysis of CO2 adsorption and activation presents a formidable challenge due to its pronounced thermodynamic stability and kinetic inertia. Previous experiments have left gaps in understanding the promotional effects and underlying mechanism of potassium. In this study, we systematically investigate CO2 adsorption and activation on clean and potassium-preadsorbed low index surfaces of transition metals. Theoretical results reveal a substantial augmentation in CO2 binding strength when potassium is introduced, concomitant with a general reduction in activation energies. Notably, linear correlations are significant on close-packed metal surfaces without and with potassium additive. Through a comprehensive analysis encompassing geometric parameters, electronic structures, and energy decomposition, we discern the physical underpinnings of the potassium effect. This enhancement is primarily ascribed to direct electron transfer and dipole-dipole interactions. Furthermore, we scrutinize the impact of an external electric field, demonstrating that the application of a negative electric field accelerates CO2 activation, mirroring the effects observed with potassium. METHODS All the periodic density function theory (DFT) calculations were performed by the Vienna Ab Initio Simulation package (VASP). The interaction between nucleus and valence electron was described using the pseudopotentials found in the projector augmented wave method (PAW). Throughout the entire work, the Bayesian error estimation functional (BEEF) was used.
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Affiliation(s)
- Yin-Ping Ma
- Frontiers Science Center for New Organic Matter, Tianjin Key Lab and Molecule-Based Material Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China
| | - Gui-Chang Wang
- Frontiers Science Center for New Organic Matter, Tianjin Key Lab and Molecule-Based Material Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
- Haihe Laboratory of Sustainable Chemical Transformation, Tianjin, 300192, China.
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2
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Pang K, Ren R, Lv Y, Wang GC. Theoretical insight into the promotion effect of potassium additive on the water-gas shift reaction over low-coordinated Au catalysts. J Mol Model 2023; 29:250. [PMID: 37452193 DOI: 10.1007/s00894-023-05649-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 07/03/2023] [Indexed: 07/18/2023]
Abstract
CONTEXT How to elucidate the effect of alkali metal promoters on gold-catalyzed water-gas shift reaction intrinsically remains a challenging, because that the complex synergy effects such as strong metal-support interactions, interfacial effects, and charge transfer of supported metal catalysts makes people difficulty in the understanding the alkali promotion phenomenon in nature. Herein, we report a systematically study of whole water-gas shift reaction mechanism on pure and the K-modified defected-Au(211) (i.e., by removing one surface Au atom from perfect Au(211) and make one model with the Au-Au coordination number is six) by using the microkinetic modeling based on first principles. Our results indicate that the presence of K can increase the adsorption ability of oxygen-containing species via the attractive coulomb interaction, has no significant effect on the adsorption of H species, but inhibits the adsorption of CO due to the steric effect. K promoter stabilizes the water adsorption by ~0.3 eV, which results in one order increasing of whole reaction rate. Interestingly, the strong promotion effect of the K can be assigned to the significant direct space interaction between K and the adsorbate H2O* through the inducted electric field, which can be further confirmed by the posed negative electric field on the unpromoted D-Au(211). Microkinetic modeling results revealed that the carboxyl mechanism is the most likely to occur, redox mechanism is the next one, and the formate mechanism is the least likely to occur. For different kinds of alkali metal additives, the adsorption strength of water molecules gradually weakens from Li to Cs, but Na shows the best promoter behavior at the low temperature. By considering the effect of K contents on the reactivity of water-gas shift reaction, we found that the K with the medium coverage (~0.2~0.3 ML) has the strongest promoting effect. It is expected that the conclusion of this work can be extended to other WGSR catalytic systems like Cu(or Pt). METHODS All calculations were performed by using the plane-wave based periodic method implemented in Vienna ab initio simulation package (VASP, version 5.4.4), where the ionic cores are described by the projector augmented wave (PAW) method. The exchange and correlation energies were computed using the Perdew, Burke and Ernzerhof functional with the vdw correction (PBE-D3). The transition states (TSs) were searched using the climbing image nudged elastic band (CI-NEB) method. Some electronic structure properties like work function was predicated by the DS-PAW software. Microkinetic simulation was carried out using MKMCXX software.
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Affiliation(s)
- Ke Pang
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China
| | - Ruipeng Ren
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China
| | - Yongkang Lv
- Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.
- Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, 030024, Shanxi, China.
| | - Gui-Chang Wang
- College of Chemistry, Nankai University, Tianjin, 300071, China.
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3
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Zhang Z, Guo R, Yang X, Fang YX. Potassium Carbonate (K 2CO 3)-Assisted Copper-Catalyzed Liquid-Phase Hydrogenation of Furfural: Striking Promotion Synergy Enables a Superior High Furfuryl Alcohol Yield at Mild Reaction Conditions. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhaoxia Zhang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Renxin Guo
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Xu Yang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
| | - Yan-Xiong Fang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
- Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory (Rongjiang Laboratory), Jieyang 515200, China
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4
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Shi R, Liao W, Ramírez PJ, Orozco I, Mahapatra M, Kang J, Hunt A, Waluyo I, Senanayake SD, Liu P, Rodriguez JA. The Interaction of K and O
2
on Au(111): Multiple Growth Modes of Potassium Oxide and Their Catalytic Activity for CO Oxidation. Angew Chem Int Ed Engl 2022; 61:e202208666. [DOI: 10.1002/anie.202208666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Rui Shi
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
| | - Wenjie Liao
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
| | - Pedro J. Ramírez
- Facultad de Ciencias Universidad Central de Venezuela 1020-A Caracas Venezuela
- Current address: Zoneca-CENEX Alta Vista 64770 Monterrey México
| | - Ivan Orozco
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
| | - Mausumi Mahapatra
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
| | - Jindong Kang
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
| | - Adrian Hunt
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
| | - Iradwikanari Waluyo
- National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA
| | | | - Ping Liu
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
| | - José A. Rodriguez
- Department of Chemistry SUNY Stony Brook Stony Brook NY 11794 USA
- Chemistry Division Brookhaven National Laboratory Upton NY 11973 USA
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5
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Huang E, Rui N, Rosales R, Kang J, Nemšák S, Senanayake SD, Rodriguez JA, Liu P. Highly Selective Methane to Methanol Conversion on Inverse SnO 2/Cu 2O/Cu(111) Catalysts: Unique Properties of SnO 2 Nanostructures and the Inhibition of the Direct Oxidative Combustion of Methane. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03060] [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]
Affiliation(s)
- Erwei Huang
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Ning Rui
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Rina Rosales
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Jindong Kang
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
| | - Slavomir Nemšák
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Sanjaya D. Senanayake
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - José A. Rodriguez
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Ping Liu
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, United States
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
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6
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Shi R, Liao W, Ramírez PJ, Orozco I, Mahapatra M, Kang J, Hunt A, Waluyo I, Senanayake SD, Liu P, Rodriguez JA. The Interaction of K and O2 on Au(111): Multiple Growth Modes of Potassium Oxide and Their Catalytic Activity for CO Oxidation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rui Shi
- SUNY Stony Brook: Stony Brook University Department of Chemistry UNITED STATES
| | - Wenjie Liao
- Stony Brook University Department of Chemistry UNITED STATES
| | - Pedro J. Ramírez
- Universidad Central de Venezuela Facultad de Ciencias UNITED STATES
| | - Ivan Orozco
- SUNY Stony Brook: Stony Brook University Department of Chemistry UNITED STATES
| | | | - Jindong Kang
- SUNY Stony Brook: Stony Brook University Department of chemistry UNITED STATES
| | - Adrian Hunt
- Brookhaven National Laboratory National Synchrotron Light Source II UNITED STATES
| | - Iradwikanari Waluyo
- Brookhaven National Laboratory National Synchrotron Light Source II UNITED STATES
| | | | - Ping Liu
- Brookhaven National Laboratory Chemistry Division UNITED STATES
| | - Jose A Rodriguez
- Brookhaven National Laboratory Chemistry 555 Lewis Avenue 11973 Upton UNITED STATES
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7
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Zhang H, Wang X, Liu P. Reaction-driven selective CO 2 hydrogenation to formic acid on Pd(111). Phys Chem Chem Phys 2022; 24:16997-17003. [PMID: 35730189 DOI: 10.1039/d2cp01971j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conversion of CO2 to useful fuels and chemicals has gained great attention in the past decades; yet the challenge persists due to the inert nature of CO2 and the wide range of products formed. Pd-based catalysts are extensively studied to facilitate CO2 hydrogenation to methanol via a reverse water gas shift (rWGS) pathway or formate pathway where formic acid may serve as an intermediate species. Here, we report the selective production of formic acid on the stable Pd(111) surface phase under CO2 hydrogenation conditions, which is fully covered by chemisorbed hydrogen, using combined Density Functional Theory (DFT) and Kinetic Monte Carlo (KMC) simulations. The results show that with the full coverage of hydrogen, instead of producing methanol as reported for Pd(111), the CO2 activation is highly selective to formic acid via a multi-step process involving the carboxyl intermediate. The high formic acid selectivity is associated with surface hydrogen species on Pd(111), which not only acts as a hydrogen reservoir to facilitate the hydrogenation steps, but also enables the formation of confined vacancy sites to facilitate the production and removal of formic acid. Our study highlights the importance of reactive environments, which can transform the surface structures and thus tune the activity/selectivity of catalysts.
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Affiliation(s)
- Hong Zhang
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA.
| | - Xuelong Wang
- Chemistry Division, Brookhaven National Lab, Upton, NY 11973, USA
| | - Ping Liu
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794, USA. .,Chemistry Division, Brookhaven National Lab, Upton, NY 11973, USA
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8
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Zhang G, Liu M, Fan G, Zheng L, Li F. Efficient Role of Nanosheet-Like Pr 2O 3 Induced Surface-Interface Synergistic Structures over Cu-Based Catalysts for Enhanced Methanol Production from CO 2 Hydrogenation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:2768-2781. [PMID: 34994552 DOI: 10.1021/acsami.1c20056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In a complex heterogeneous metal-catalyzed reaction process, unique cooperative effects between metal sites and surface-interface active sites, as well as favorable synergy between surface-interface active sites, can play crucial roles in improving their catalytic performances. In this work, a ZnO-modified Cu-based catalyst over defect-rich Pr2O3 nanosheets for high-efficiency CO2 hydrogenation to produce methanol was successfully constructed. It was demonstrated that an as-fabricated nanosheet-like Cu-based catalyst presented several structural advantages including the formation of highly dispersive Cu0 sites and the coexistence of abundant defective Pr3+-Vo-Pr3+ structures (Vo: oxygen vacancy) and interfacial Cu-O-Pr sites. Combining structural characterization and catalytic reaction results with density functional theory calculations, it was clearly unveiled that the synergy between surface defective structures and Cu-Pr2O3 interfaces over the catalyst remarkably promoted the adsorption of CO2 and CO intermediate, thus boosting the CO2 hydrogenation simultaneously via both the formate intermediate pathway and the intense reverse water-gas shift reaction-derived CO hydrogenation pathway, along with a high space-time yield of methanol of 0.395 gMeOH·gcat-1·h-1 under mild reaction conditions (260 °C and 3.0 MPa). The study provides a new strategy to construct high-performance Cu-based catalysts for high-efficiency CO2 hydrogenation to produce methanol and a deep understanding of the promotional roles of synergy between surface-interface active sites in the CO2 hydrogenation.
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Affiliation(s)
- Guangcheng Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Mengran Liu
- Beijing Institute of Aerospace Testing Technology, Beijing Key Laboratory of Research and Application for Aerospace Green Propellants, Beijing 100074, China
| | - Guoli Fan
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Lirong Zheng
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Feng Li
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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9
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Cheng J, Hou Y, Lian K, Xiao H, Lin S, Wang X. Metalized Carbon Nitrides for Efficient Catalytic Functionalization of CO2. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05013] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jiajia Cheng
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Yuchen Hou
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Kangkang Lian
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Hongxiang Xiao
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Sen Lin
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Xinchen Wang
- State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, China
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10
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Liao W, Liu P. Enhanced descriptor identification and mechanism understanding for catalytic activity using a data-driven framework: revealing the importance of interactions between elementary steps. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00284a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A data-driven framework was developed which used ML surrogate model to extract activity controlling descriptors from kinetics dataset. It enhanced mechanic understanding and predicted catalytic activities more accurately than derivate-based method.
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Affiliation(s)
- Wenjie Liao
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York, 11794, USA
| | - Ping Liu
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York, 11794, USA
- Chemistry Division, Brookhaven National Laboratory, Upton, New York, 11973, USA
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11
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Song YY, Wang G. Effect of Potassium for Propylene Epoxidation on Cu2O(111) by Molecular Oxygen: A DFT Study. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01857d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, spin-polarized density functional theory (DFT) calculations with a Hubbard U correction were employed to investigate the effect of potassium for propylene epoxidation on Cu2O(111) surface by...
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12
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Fernández-Catalá J, Navlani-García M, Berenguer-Murcia Á, Cazorla-Amorós D. Exploring CuxO-doped TiO2 modified with carbon nanotubes for CO2 photoreduction in a 2D-flow reactor. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101796] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Roy D, Mandal SC, Pathak B. Machine Learning-Driven High-Throughput Screening of Alloy-Based Catalysts for Selective CO 2 Hydrogenation to Methanol. ACS APPLIED MATERIALS & INTERFACES 2021; 13:56151-56163. [PMID: 34787997 DOI: 10.1021/acsami.1c16696] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The revolutionary development of machine learning and data science and exploration of its application in material science are huge achievements of the scientific community in the past decade. In this work, we have reported an efficient approach of machine learning-aided high-throughput screening for finding selective earth-abundant high-entropy alloy-based catalysts for CO2 to methanol formation using a machine learning algorithm and microstructure model. For this, we have chosen earth-abundant Cu, Co, Ni, Zn, and Mg metals to form various alloy-based compositions (bimetallic, trimetallic, tetrametallic, and high-entropy alloys) for selective CO2 reduction reaction toward CH3OH. Since there are several possible surface microstructures for different alloys, we have used machine learning along with DFT calculations for high-throughput screening of the catalysts. In this study, the stability of various 8-atom fcc periodic (111) surface unit cells has been calculated using the atomic-size difference factor (δ) as well as the ratio taken from Gibbs free energy of mixing (Ω). Thinking about the simplicity and accuracy, microstructure models by considering the neighboring atoms of the adsorption sites and others as Cu atoms have been considered for different adsorption sites (on-top, bridge, and hollow-hcp). Moreover, the adsorption energies of the *H, *O, *CO, *HCO, *H2CO, and *H3CO intermediates have been predicted using the best fitted algorithm of the training set. The predicted adsorption energies have been screened based on the pure Cu adsorption energy. Furthermore, the screened catalysts have been correlated among different adsorption site microstructures. At the end, we were able to find seven active catalysts, among which two catalysts are CuCoNiZn-based tetrametallic, three catalysts are CuNiZn-based trimetallic, and two catalysts are CuCoZn-based trimetallic alloys. Hence, this work demonstrates not an ultimate but an efficient approach for finding new product-selective catalysts, and we expect that it can be convenient for other similar types of reactions in forthcoming days.
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Affiliation(s)
- Diptendu Roy
- Department of Chemistry, Indian Institute of Technology Indore, Indore 453552, India
| | - Shyama Charan Mandal
- Department of Chemistry, Indian Institute of Technology Indore, Indore 453552, India
| | - Biswarup Pathak
- Department of Chemistry, Indian Institute of Technology Indore, Indore 453552, India
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14
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Wang X, Ramírez PJ, Liao W, Rodriguez JA, Liu P. Cesium-Induced Active Sites for C-C Coupling and Ethanol Synthesis from CO 2 Hydrogenation on Cu/ZnO(0001̅) Surfaces. J Am Chem Soc 2021; 143:13103-13112. [PMID: 34297573 DOI: 10.1021/jacs.1c03940] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The efficient conversion of carbon dioxide, a major air pollutant, into ethanol or higher alcohols is a big challenge in heterogeneous catalysis, generating great interest in both basic scientific research and commercial applications. Here, we report the facilitated methanol synthesis and the enabled ethanol synthesis from carbon dioxide hydrogenation on a catalyst generated by codepositing Cs and Cu on a ZnO(0001̅) substrate. A combination of catalytic testing, X-ray photoelectron spectroscopy (XPS) measurements, and calculations based on density functional theory (DFT) and kinetic Monte Carlo (KMC) simulation was used. The results of XPS showed a clear change in the reaction mechanism when going from Cs/Cu(111) to a Cs/Cu/ZnO(0001̅) catalyst. The Cs-promoting effect on C-C coupling is a result of a synergy among Cs, Cu, and ZnO components that leads to the presence of CHx and CHyO species on the surface. According to the DFT-based KMC simulations, the deposition of Cs introduces multifunctional sites with a unique structure at the Cu-Cs-ZnO interface, particularly being able to promote the interaction with CO2 and thus the methanol synthesis predominantly via the formate pathway. More importantly, it tunes the CHO binding strongly enough to facilitate the HCOOH decomposition to CHO via the formate pathway, but weakly enough to allow further hydrogenation to methanol. The fine-tuning of CHO binding also enables a close alignment of a CHO pair to facilitate the C-C coupling and eventually ethanol synthesis. Our study opens new possibilities to allow the highly active and selective conversion of carbon dioxide to higher alcohols on widely used and low-cost Cu-based catalysts.
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Affiliation(s)
- Xuelong Wang
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Pedro J Ramírez
- Facultad de Ciencias, Universidad Central de Venezuela, Caracas 1020-A, Venezuela.,Zoneca-CENEX, R&D Laboratories, Alta Vista, 64770 Monterrey, México
| | - Wenjie Liao
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794, United States
| | - José A Rodriguez
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Ping Liu
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
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15
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Ha NN, Thi Thu Ha N, Cam LM. New insight into the mechanism of carbon dioxide activation on copper-based catalysts: A theoretical study. J Mol Graph Model 2021; 107:107979. [PMID: 34217023 DOI: 10.1016/j.jmgm.2021.107979] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/16/2021] [Accepted: 06/24/2021] [Indexed: 11/18/2022]
Abstract
A combination of Artificial Bee Colony algorithm, eXtended Tight Binding and Density functional theory methods were performed to study the activation process of carbon dioxide (CO2) over copper (Cu4 cluster) based catalytic systems. The findings revealed that the activation of the C-O bond resulted from the electron transfer to σ*, π* - MO of CO2. The more the electrons are transferred to CO2, the more the C-O bond is activated and elongated. The suitability of several metal oxide supports (Fe2O3, Al2O3, MgO, ZnO) is estimated using calculated electronic parameters (global electrophilicity index, vertical ionization potential and vertical electron affinity). Aside from demonstrating the appropriateness of Al2O3 and ZnO, a thorough examination of MgO revealed that, due to the formation of stable carbonate products, this oxide is not really appropriate as a support for copper-based catalysts in CO2 conversion. Our studies have also shown that the electron enrichment of copper atoms plays a key role in the activation of C-O bonds. Alkali metal doping (Li, K, Cs) significantly improves the catalytic efficiency of the Cu4 cluster. Based on the results of electron transfer to the CO2 molecule, the effect of doping alkali metal atoms may be organized in the following order: Cs > K > Li. A new core/shell catalytic system with potassium atoms in the core and copper atoms in the shell has been proposed and has proven to be a promising, efficient catalytic system in the CO2 adsorption and activation.
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Affiliation(s)
- Nguyen Ngoc Ha
- Faculty of Chemistry, Hanoi National University of Education, 100000, 136 Xuan Thuy Str., Hanoi, Viet Nam.
| | - Nguyen Thi Thu Ha
- Faculty of Chemistry, Hanoi National University of Education, 100000, 136 Xuan Thuy Str., Hanoi, Viet Nam.
| | - Le Minh Cam
- Faculty of Chemistry, Hanoi National University of Education, 100000, 136 Xuan Thuy Str., Hanoi, Viet Nam.
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16
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Abstract
Mitigation of anthropogenic CO2 emissions possess a major global challenge for modern societies. Herein, catalytic solutions are meant to play a key role. Among the different catalysts for CO2 conversion, Cu supported molybdenum carbide is receiving increasing attention. Hence, in the present communication, we show the activity, selectivity and stability of fresh-prepared β-Mo2C catalysts and compare the results with those of Cu/Mo2C, Cs/Mo2C and Cu/Cs/Mo2C in CO2 hydrogenation reactions. The results show that all the catalysts were active, and the main reaction product was methanol. Copper, cesium and molybdenum interaction is observed, and cesium promoted the formation of metallic Mo on the fresh catalyst. The incorporation of copper is positive and improves the activity and selectivity to methanol. Additionally, the addition of cesium favored the formation of Mo0 phase, which for the catalysts Cs/Mo2C seemed to be detrimental for the conversion and selectivity. Moreover, the catalysts promoted by copper and/or cesium underwent redox surface transformations during the reaction, these were more obvious for cesium doped catalysts, which diminished their catalytic performance.
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