Efficient low-temperature soot combustion by bimetallic Ag–Cu/SBA-15 catalysts


Zhaojun Wen , Xinping Duan , Menglin Hu , Yanning Cao , Linmin Ye , Lilong Jiang , Youzhu Yuan

DOI:10.1016/j.jes.2016.12.021

Received September 06, 2016,Revised November 23, 2016, Accepted December 17, 2016, Available online February 14, 2017

Volume 64,2018,Pages 122-129

In this study, the effects of copper (Cu) additive on the catalytic performance of Ag/SBA-15 in complete soot combustion were investigated. The soot combustion performance of bimetallic Ag–Cu/SBA-15 catalysts was higher than that of monometallic Ag and Cu catalysts. The optimum catalytic performance was acquired with the 5Ag1-Cu0.1/SBA-15 catalyst, on which the soot combustion starts at Tig225°C with a T50285°C. The temperature for 50% of soot combustion was lower than that of conventional Ag-based catalysts to more than 50°C (Aneggi et al., 2009). Physicochemical characterizations of the catalysts indicated that addition of Cu into Ag could form smaller bimetallic Ag–Cu nanolloy particles, downsizing the mean particle size from 3.7nm in monometallic catalyst to 2.6nm in bimetallic Ag–Cu catalyst. Further experiments revealed that Ag and Cu species elicited synergistic effects, subsequently increasing the content of surface active oxygen species. As a result, the structure modifications of Ag by the addition of Cu strongly intensified the catalytic performance.

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