期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 45, 页码 50739-50750出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c11248
关键词
rWGS; nickel; CeO2; La-doping; DFT calculations
资金
- Spanish Ministry of Science and Innovation [PID2021-123287OB-I00, PID2021122477-OB-I00, PID2021-128915NB- I00, RTI2018101604-B-I00]
- CSIC through the i-LINK 2021 program [LINKA20408]
- AEI-MINECO/FEDER [PID2019-106315RB-I00]
- Comunidad de Madrid regional government
- European Structural Funds (FotoArt-CM project) [S2018/NMT-4367]
- MCIN/AEI [PLEC2021-007906]
- European Union NextGenerationEU/PRTR
- European Union [832121]
- PRACE
- Marie Curie Actions (MSCA) [832121] Funding Source: Marie Curie Actions (MSCA)
The design of an active and economically viable catalyst for CO2 conversion is crucial in the fight against global warming and energy demand. We have developed efficient catalysts for reverse water-gas shift reaction, and shown that Ni/La-doped CeO2 catalysts have unprecedented catalytic performance. The correlation between physicochemical properties and catalytic activity has provided insights for optimizing the catalyst.
The design of an active, effective, and economically viable catalyst for CO2 conversion into value-added products is crucial in the fight against global warming and energy demand. We have developed very efficient catalysts for reverse water-gas shift (rWGS) reaction. Specific conditions of the synthesis by combustion allow the obtention of macroporous materials based on nanosized Ni particles supported on a mixed oxide of high purity and crystallinity. Here, we show that Ni/La-doped CeO2 catalysts-with the right Ni and La proportions-have an unprecedented catalytic performance per unit mass of catalyst for the rWGS reaction as the first step toward CO2 valorization. Correlations between physicochemical properties and catalytic activity, obtained using a combination of different techniques such as X-ray and neutron powder diffraction, Raman spectroscopy, in situ near ambient pressure X-ray photoelectron spectroscopy, electron microscopy, and catalytic testing, point out to optimum values for the Ni loading and the La proportion. Density functional theory calculations of elementary steps of the reaction on model Ni/ ceria catalysts aid toward the microscopic understanding of the nature of the active sites. This finding offers a fundamental basis for developing economical catalysts that can be effectively used for CO2 reduction with hydrogen. A catalyst based on Ni0.07/ (Ce0.9La0.1Ox)0.93 shows a CO production of 58 x 10-5 molCO center dot gcat-1 center dot s-1 (700 degrees C, H2/CO2 = 2; selectivity to CO > 99.5), being stable for 100 h under continuous reaction.
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