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This Week

Aug 1
Friday

In situ x-ray diffraction applied to the study of metal oxide and carbide catalysts

Speaker: Wenqian Xu
XSD Seminar
Advanced Photon Source, Argonne, IL
401/A1100 @ 11:00 AM
View Description
In situ x-ray diffraction (XRD) is nowadays widely applied in physical science to study material structures under desired conditions. In the field of catalysis, it is of key interest to know how a catalyst functions and how its structure related to its catalytic property. Probing the catalyst with x-ray at its working state is helpful in providing such information. In this talk, two studies are presented. In the first one, a Ni/CeO2 catalyst for ethanol steam reforming (ESR) is investigated with both in situ XRD and in situ infrared spectroscopy. Ethoxyl, acetate, carbonate and hydroxyl species are identified as surface intermediates that appear during the reaction process. The synergy between metallic Ni and the CeO2 support is revealed. The second study is on carburization of molybdenum oxide by temperature-programmed reduction in hydrocarbons. Formation of either the cubic or the hexagonal carbide phase is found to be affected by both concentration and speciation of the hydrocarbons as well as the heating procedures. Close examination of the XRD and the pair distribution function (PDF) profile of the cubic carbide phase shows the presence of stacking faults in its structure.
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Aug 1
Friday

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Wednesday

APS/Users Operations Monthly Meeting

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