The catalytic purification for soot particles is dependent on the SO2 tolerance and activity of the catalysts in practical application. Herein, we have elaborately fabricated the nanocatalysts of three-dimensionally ordered… Click to show full abstract
The catalytic purification for soot particles is dependent on the SO2 tolerance and activity of the catalysts in practical application. Herein, we have elaborately fabricated the nanocatalysts of three-dimensionally ordered macroporous (3DOM) Al2O3-supported binary Pt-cobalt oxide nanoparticles (NPs) using the method of gas bubbling-assisted membrane precipitation (GBMP), abbreviated as Pt-CoOx/3DOM-Al2O3. 3DOM-Al2O3 support can not only improve the contact performance between soot and active sites, but also possesses surface acidity to improve the SO2 tolerance. Supported binary Pt-CoOx NPs over 3DOM-Al2O3 have high-efficient property for activating NO and O2. Pt-CoOx/3DOM-Al2O3 catalyst exhibits super catalytic performance and SO2 tolerance during removal of soot particles, whose values of TOF and T50 are 0.29 h-1 and 368 oC, respectively. The catalytic and SO2-tolerant mechanisms of Pt-CoOx/3DOM-Al2O3 catalyst for soot purification are systematically studied by in-situ DRIFT spectra. The synergy effect of binary Pt-CoOx NPs plays a vital role in oxidation of NO to NO2 as one key step during catalytic soot removal, and the surface acidity of 3DOM-Al2O3 can not only inhibit the adsorption of SO2, but also enhance the decomposition of surface hydrosulfate species. This work supplies one novel strategy to development of high-efficient catalysts for SO2-tolerant catalytic removal of soot particles in both fundament research and practical applications.
               
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