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Date of Award
Department or Program Affiliation
Master of Science (MS)
Bussell, Mark E.
Bao, Ying (Materials scientist)
Berger, Robert F.
The reverse water gas shift (RWGS) reaction converts a greenhouse gas, carbon dioxide (CO2) into a useful reagent, carbon monoxide (CO). As a platform molecule, CO can be converted into fuels such as methanol (CH3OH), methane (CH4), and olefins (CxH2x) via reactions such as the Fischer-Tropsch synthesis. Nickel phosphide (Ni2P) and indium oxide (In2O3) are two noted catalysts capable of converting CO2 into CO via the RWGS reaction, but photocatalysts comprised of Ni2P and In2O3 together have had little investigation. Ni2P/In2O3 catalysts were synthesized via an initial incipient wetness impregnation followed by a temperature-programmed reduction using in situ generated PH3 to form Ni2P/In2O3. Light absorption was recorded using UV-Vis-NIR spectral analysis. Reaction studies were performed using a batch photocatalytic reactor utilizing a 300 W Xe lamp and gas chromatography. Initial studies were performed using nanostructured In2O3 to enable photothermal enhancement from loadings of Ni2P. Trends of increased photoenhancement were observed from the introduction of Ni2P onto the In2O3 support materials. Studies were conducted with Ni2P loadings of 0.5, 1, 2.5, 5, and 7.5 wt% on In2O3 in light and dark environments to evaluate enhancement of the RWGS reaction; the optimal Ni2P loading was determined to be 2.5 wt% for the most active In2O3 support.
nickel phosphide, reducible oxide, RWGS, heterogeneous catalysis, indium oxide
Western Washington University
Subject – LCSH
Nickel catalysts; Phosphides--Synthesis; Indium--Synthesis; Oxides--Synthesis; Heterogeneous catalysis; Catalysts--Absorption and adsorption; Water-gas--Reactivity; Reduction (Chemistry)
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Baldwin, Michael, "Development of nickel phosphide-indium oxide photothermal catalysts for the reverse water gas shift reaction" (2023). WWU Graduate School Collection. 1257.
Available for download on Thursday, December 12, 2024