Abstract
Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio<0.3). Mo deposition changed the apparent activation energy and CO2 and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO2, CO, and H2, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1min−1 under dark and light conditions at 473K, respectively, whereas the intrinsic activity of a Pt-MoOx site is increased to 22.7 and 160min−1 under dark and light conditions at 473K, respectively.
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