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Chang J, Hülsey MJ, Wang S, Li M, Ma X, Yan N. Electrothermal Water-Gas Shift Reaction at Room Temperature with a Silicomolybdate-Based Palladium Single-Atom Catalyst. Angew Chem Int Ed Engl 2023; 62:e202218265. [PMID: 36700387 DOI: 10.1002/anie.202218265] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 01/21/2023] [Accepted: 01/24/2023] [Indexed: 01/27/2023]
Abstract
The water-gas shift (WGS) reaction is often conducted at elevated temperature and requires energy-intensive separation of hydrogen (H2 ) from methane (CH4 ), carbon dioxide (CO2 ), and residual carbon monoxide (CO). Designing processes to decouple CO oxidation and H2 production provides an alternative strategy to obtain high-purity H2 streams. We report an electrothermal WGS process combining thermal oxidation of CO on a silicomolybdic acid (SMA)-supported Pd single-atom catalyst (Pd1 /CsSMA) and electrocatalytic H2 evolution. The two half-reactions are coupled through phosphomolybdic acid (PMA) as a redox mediator at a moderate anodic potential of 0.6 V (versus Ag/AgCl). Under optimized conditions, our catalyst exhibited a TOF of 1.2 s-1 with turnover numbers above 40 000 mol CO 2 ${{_{{\rm CO}{_{2}}}}}$ molPd -1 achieving stable H2 production with a purity consistently exceeding 99.99 %.
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Affiliation(s)
- Jinquan Chang
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai, New City, Fuzhou, 350207, China.,Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
| | - Max J Hülsey
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
| | - Sikai Wang
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai, New City, Fuzhou, 350207, China.,Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
| | - Maoshuai Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Xinbin Ma
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai, New City, Fuzhou, 350207, China.,Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Ning Yan
- Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University Binhai, New City, Fuzhou, 350207, China.,Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore
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Sun C, Huang S, Huang M, Zhang X, Xu S, Wang H, Chen Y, Shi XR. Single-metal-atom catalysts supported on graphdiyne catalyze CO oxidation. Dalton Trans 2021; 50:10867-10879. [PMID: 34297016 DOI: 10.1039/d1dt00934f] [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
Single-metal-atom catalysts supported on graphdiyne (GDY) exhibit great potential for catalyzing low temperature CO oxidation in solving the increasingly serious environmental problems caused by CO emissions due to the high catalytic activity, clear structure, uniform metal distribution and low cost. First principle calculations were employed to study CO oxidation activities of four M@GDY single-atom catalysts (M = Pt, Rh, Cu, and Ni). For each catalyst, five possible reaction mechanisms including bi-molecular and tri-molecular reactions were discussed. According to the calculated reaction barriers, the preferred reaction pathway is via the bi-molecular Langmuir-Hinshelwood (BLH) ((CO + O2)* → OCOO* → CO2 + O*) route to yield the first CO2 molecule with 0.55, 0.51, and 0.53 eV as the energy barriers of the rate-limiting steps of Pt@GDY, Rh@GDY, and Cu@GDY, respectively, whereas for Ni@GDY, it switches to the tri-molecular Eley-Rideal (TER1) ((2CO)* + O2→ OCOOCO* → 2CO2) mechanism with the reaction barrier of the rate-limiting step being 1.27 eV. Based on the energy difference in the initial states of the five reaction mechanisms, TER1 is generally viable. No matter it is based on the calculated reaction barrier or the energy of the initial state of each mechanism, the non-noble Cu@GDY is supposed to be an efficient catalyst as the noble ones. The electronic properties are calculated to explain the bonding strength and origin of the catalytic performance. The GDY support plays an important role in the electron transfer process.
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Affiliation(s)
- Chunyan Sun
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
| | - Simin Huang
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
| | - Mengru Huang
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
| | - Xiangrui Zhang
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
| | - Shusheng Xu
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
| | - Hui Wang
- Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, P.R. China and University of the Chinese Academy of Sciences, Beijing 100049, P.R. China
| | - Yanyan Chen
- University of the Chinese Academy of Sciences, Beijing 100049, P.R. China and State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, P.R. China
| | - Xue-Rong Shi
- School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, P.R. China.
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