Transition metal oxide is one category of heterogeneous catalysts. Surface lattice oxygen atoms and oxygen vacancies can directly particulate catalytic reactions. Other than the generation of surface vacancies, phase transformation is another potential structural evolution observable under reaction conditions or during catalysis. In-situ studies of reduction of nitric oxides and methane combustion on cobalt oxides, nickel oxides, and mixed oxides have been performed under reaction conditions by using ambient pressure XPS. Surface chemistry including surface composition and density of oxygen vacancies was revealed under different reaction conditions. Products from isotope-replaced reactants and isotope-labeled catalysts were analyzed with quadrupole mass spectrometer. Correlation between surface chemistry of these transition metal oxides and their catalytic performances has been the built.

In-situ studies of catalysis on transition metal oxides

248th National Meeting (2014)

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