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Au/nickel phosphate-5 (Au/VSB-5) composite with the noble metal loading amount of 1.43 wt.% is prepared by using microporous VSB-5 nanocrystals as the support. Carbon monoxide (CO) oxidation reaction is carried out over the sample with several catalytic cycles. Complete conversion of CO is achieved at 238°C over the catalyst at the first catalytic cycle. The catalytic activity improved greatly at the second cycle with the complete conversion fulfilled at 198°C and preserved for the other cycles. A series of experiments such as X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), ultraviolet-visible (UV-vis) spectroscopy, and X-ray photoelectron spectroscopy (XPS) are carried out to characterize the catalysts before and after the reaction to study the factors influencing this promotion at the second cycle.

Catalytic CO Oxidation over Au Nanoparticles Loaded Nanoporous Nickel Phosphate Composite