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Catalytic performance of Nb2O5 modified Ru/CeO2 for dichloromethane oxidation.

Authors :: Hao, Wencheng
Wang, Zhiwei
Xie, Shaohua
Wei, Lu
Hou, Zhiquan
Liu, Yuxi
Dai, Hongxing
Deng, Jiguang
Source :: Progress in Natural Science. Aug2023, Vol. 33 Issue 4, p486-494. 9p.
Publication Year :: 2023
Abstract: 1 wt% Ru/5 wt% Nb 2 O 5 /CeO 2 (RuNbCe) catalyst was synthesized via the incipient wetness impregnation method, and measured for the catalytic oxidation of dichloromethane (DCM). The physicochemical properties of catalysts were determined used various characterization techniques. Compared with 1 wt% Ru/CeO 2 , 5 wt% Nb 2 O 5 /CeO 2 , CeO 2 , 1 wt% Ru/ x Nb 2 O 5 /CeO 2 (x = 1 wt%, 2 wt%, and 3 wt%) and 1 wt% Ru/ yM O n /CeO 2 (M = Co, Cr, Fe, Mg, Cu; y = 5 wt%), the addition of 5 wt% Nb 2 O 5 obviously improved the catalytic performance of 1 wt% Ru/CeO 2 , with the T 90% and apparent activation energy (E a) being 287 oC and 43.5 kJ/mol, respectively, and less formation of polychlorinated byproducts at space velocity (SV) = 15,000 mL g‒1 h‒1. The RuNbCe catalyst showed good thermal and hydrothermal stability, as well as HCl-resistance performance. We deduced that the higher oxidation performance of the RuNbCe catalyst may be attributed to the suitable acidic sites, good redox capacity, high surface adsorbed oxygen species concentration, and the strong interaction among Ru, Nb 2 O 5 and CeO 2. The RuNbCe catalyst has the potential to be applied for the elimination of chlorinated volatile organic compounds (CVOCs). [Display omitted] • Ru/Nb 2 O 5 /CeO 2 catalyst is prepared by an incipient wetness impregnation method. • Ru/Nb 2 O 5 /CeO 2 exhibits high catalytic activity for dichloromethane removal. • Ru/Nb 2 O 5 /CeO 2 shows high (hydro-)thermal stability and HCl-resistance. • High performance relates to acidity, redox capacity, O ads , and strong interaction. [ABSTRACT FROM AUTHOR]