Structural response of Ni/ZrO2 to feed modulations during CH4 reforming reactions

16th International Conference on X-ray Absorption Fine Structure

Steib, M.^1 ; Jentys, A.^1 ; Lercher, J.A.^1

Department of Chemistry, Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, Garching

85747, Germany^1

关键词: Conventional systems;    Different pressures;    Gas compositions;    Oxidation and reduction;    Parallel treatments;    Reaction conditions;    Spectral quality;    Structural response;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012049/pdf
DOI  :  10.1088/1742-6596/712/1/012049

来源: IOP

【 摘 要 】

Time resolved oxidation and reduction cycles of ZrO2-supported Ni catalysts for dry reforming of CH4(CO2+ CH4↔ 2 CO + 2 H2) during feed modulations have been studied. Under reaction conditions (1073 K) Ni remains fully reduced, whereas switching the feed gas to pure CO2results in a slow (25 sec) formation of a stable NiO phase. When switching back to reaction conditions the NiO phase is rapidly reduced (∼ 1 sec) to metallic Ni. In the context of this study, a novel capillary cell has been built, allowing the parallel treatment of 5 catalyst samples with different gas compositions and different pressures. A comparison of the capillary cell to conventional systems regarding the spectral quality and the kinetic data shows that the capillary cell can be used to obtain identical kinetic data and high quality X-ray absorption spectra.