LAUSR

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.