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- W3036320908 abstract "Abstract CuO x /SiO 2 precursor was successfully fabricated by an ammonia evaporation hydrothermal method. Upon reduction in 5 vol % H 2 /N 2 at 250, 300, 350, 400, or 450 °C, CuO and copper phyllosilicate species in the precursor bring about the formation of highly dispersed Cu 0 and Cu + species, respectively. The Cu + /Cu 0 ratios were studied by XAES technique, while the particle sizes were estimated on the basis of HRTEM images. It is disclosed that the ratios and particle sizes varied with CuO x /SiO 2 reduction temperatures. The results of in situ DRIFTS and XAES characterization reveal that both Cu 0 and Cu + are active for CO adsorption and water dissociation, especially so with Cu 0 and Cu + particles of small sizes. It was also observed that the adsorption of CO on Cu + is stronger than that on Cu 0 , and Cu 0 is more active than Cu + for water dissociation. Among the prepared Cu/SiO 2 catalysts, the one resulted from precursor reduction at 300 °C shows the highest CO conversion in WGS reaction, which is attributed to the small size of Cu 0 (2.45 nm) and the large amount of Cu + ." @default.
- W3036320908 created "2020-06-25" @default.
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- W3036320908 date "2020-08-26" @default.
- W3036320908 modified "2023-10-12" @default.
- W3036320908 title "Unraveling the Role of Cu <sup>0</sup> and Cu <sup>+</sup> Sites in Cu/SiO <sub>2</sub> Catalysts for Water‐Gas Shift Reaction" @default.
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- W3036320908 doi "https://doi.org/10.1002/cctc.202000523" @default.
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