期刊
SCIENCE CHINA-CHEMISTRY
卷 65, 期 10, 页码 2015-2022出版社
SCIENCE PRESS
DOI: 10.1007/s11426-022-1383-x
关键词
zeolites; encapsulation; CO oxidation; Pt; atomic scale
资金
- National Natural Science Foundation of China [22172110]
By precisely controlling the distribution of Pt species in silicalite-1, the catalytic performance of 1 at.% Pt-loaded zeolite catalysts for CO oxidation can be maximized. Pt species exist as few-atom clusters in the channels and interact with Pt nanoparticles embedded in the zeolite framework.
Metal-zeolite catalysts are vital in chemical and fuel production for their great stability, stereo-selectivity, and atom economy. When metal species keep shrinking their sizes to the subnanometer region, their spatial distribution in the zeolite framework/channels could have a great impact on their catalytic performance. Here, we precisely control the Pt species loaded on a silicalite-1 zeolite and characterize their structural status to the catalytic performance for CO oxidation. We find that Pt species exits as few-atom clusters encapsulated in the channels and destructively embedded Pt nanoparticles in the framework, besides the conventional surface-supported Pt. By utilizing effective Pt sites and limiting their sizes in the zeolite, we can maximize the catalytic CO oxidation performance of 1 at.% Pt-loaded zeolite catalysts to achieve a T-100 as low as 90 degrees C and a stable reaction above 216 h.
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