Unraveling the role of oxygen vacancies in high-performance catalysts based on Ni/CeO2 for CO2 reduction to CO with hydrogen
Carbon dioxide (CO2) has been attributed to be one of the main sources of the greenhouse effect. Nowadays, there are increasing attempts to consider it as a resource rather than a waste. Conversion of CO2 into CO by catalytic reduction with hydrogen (reverse water gas shift reaction (rWGS, CO2 + H2 „\ CO + H2O) has been recognized as one of the most promising processes for CO2 valorization. We have succeeded in the development of catalysts based on Niy(Ce1-xLxO2-x/2)1-y (L: Lanthanide) cermets with high efficiency for the rWGS reaction. These cermet materials consist of a lanthande-doped-CeO2 matrix with supported Ni nanoparticles. The presence of oxygen vacancies in the matrix is essential for the catalytic process. These phases can be perfectly fitted in the structural model of a cubic fluorite for the ceria support. In this proposal we aim to investigate the crystal structure features at RT, including the evolution of the oxygen vacancies with rare-earth nature and the doping level, with respect to a catalyst based on non-doped CeO2. We ask for 3 days of beam time at D2B diffractometer, for 12 samples ((Ni)0.10(Ce1-xLxO2-d)0.90) (x= 0, 0.05, 0.1 and 0.2 for L= La, Pr, Nd).
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Consuelo Alvarez-Galvan; ALONSO Jose Antonio and FERNANDEZ DIAZ Maria Teresa. (2021). Unraveling the role of oxygen vacancies in high-performance catalysts based on Ni/CeO2 for CO2 reduction to CO with hydrogen. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-746
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