期刊
APPLIED SURFACE SCIENCE
卷 532, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147455
关键词
Bi-active sites; Platinum cluster; Oxygen vacancy; Perovskite-type oxide; Carbon monoxide oxidation
类别
资金
- Natural Science Foundation of China [21872101, 21962014]
- Science and Technology Program of Tianjin, China [18ZXSZSF00070]
- Beijing Synchrotron Radiation Facility (BSRF)
A new scheme for constructing bi-active sites of highly dispersed N and oxygen vacancies on a catalyst was put forward in this study. Pt/LaCoxNi1-xO3/SiO2 was synthesized by reducing LaCoxNi0.87-xPt0.13O3 with the structure of perovskite loaded on silica. The catalytic performance for carbon monoxide oxidation over the catalysts were studied. The catalysts were characterized via using XRD, XPS, XAFS, N-2 adsorption-desorption, H-2-TPR, TEM, O-2 and CO-TPD techniques. The results pointed out that nanocrystal lines of LaCoxNi0.87Pt0.13O3 were supported on SiO2. N clusters could be formed through reduction process at 300 degrees C and highly dispersed on catalyst's surface, and the catalyst transformed to Pt/LaCoxNi1-xO3/SiO2; at the same time, oxygen vacancies also formed on the surface of LaCoxNi1-xO3. The catalytic WA revealed that LaCo0.44Ni0.43Pt0.13O3/SiO2 displayed high activity and good stability for the oxidation of CO. The highly dispersed closely contact bi-active sites, the confinement of oxygen vacancies and strong interaction between N clusters and support were responsible for the significant catalytic activity and stability of LaCo0.44Ni0.43Pt0.13O3/SiO2 catalyst.
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