Enhanced Activity for CO Preferential Oxidation over CuO Catalysts Supported on Nanosized CeO2 with High Surface Area and Defects
نویسندگان
چکیده
Nanosizedceria (n-CeO2) was synthesized by a facile method in 2-methylimidazolesolution. The characterization results of XRD, N2 adsorption-desorption, Raman and TEM indicate that n-CeO2 shows regular size 10 ± 1 nm, high surface area 130 m2·g−1 oxygen vacancies on the surface. A series CuO/n-CeO2 catalysts (CuCeOX) with different copper loading were prepared for preferential oxidation CO H2-rich gases (CO-PROX). All CuCeOX exhibit catalytic activity due to excellent structural properties n-CeO2, over which 100% conversion is obtained at 120 °C. increases order CuCeO12 < CuCeO3 CuCeO6 CuCeO9. It good agreement amount active Cu+ species, Ce3+ species these catalysts, suggesting strength interaction between highly dispersed CuO decisive factor activity. stronger formation more readily reducible CuCeO9, highest stability broadest temperature “window” complete (120–180 °C).
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ژورنال
عنوان ژورنال: Catalysts
سال: 2021
ISSN: ['2073-4344']
DOI: https://doi.org/10.3390/catal11080884