Boosting the sintering resistance of platinum–alumina catalyst via a morphology-confined phosphate-doping strategy

Autor:	Jinshi Dong, Hongji Zou, Panpan Chang, Yan Guo, Yutao Zhang
Rok vydání:	2021
Předmět:	Coalescence (physics) Ostwald ripening Materials science Doping Sintering chemistry.chemical_element Catalysis symbols.namesake chemistry Chemical engineering symbols Particle Particle size Platinum
Zdroj:	Catalysis Science & Technology. 11:3047-3058
ISSN:	2044-4761 2044-4753
DOI:	10.1039/d0cy02386h
Popis:	It is still a great challenge to develop robust sintering-resistant automotive exhaust catalysts due to the harsh working temperature, varying from ambient to >1000 °C. Here we report a strategy to simultaneously control the sintering process of both particle migration and coalescence (PMC) and Ostwald ripening (OR) by introducing non-oxides MPO4 (M = Al, Ce, La) to the Pt–Al2O3 catalyst. The effects of the mix ratio, type of phosphates and their particle size on the catalysts' sintering-resistance performances were investigated. As a result, the catalyst of Pt–Al2O3 mixed with ball-milled LaPO4 (LaPO4mill) at a ratio of 2 : 1 showed the best sintering resistance. The outstanding sintering resistance of Pt–Al2O3–LaPO4mill was attributed to: 1) the strong interaction between Pt and the small-sized LaPO4, which induced an active Pt–O–La interface, 2) the mutual reinforced dual-supports with a high surface area, and 3) the confinement effect of the slim nanowire-shaped LaPO4 grains.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::413d65c1911158c6b9001d600206673a https://doi.org/10.1039/d0cy02386h Zobrazit plný text záznamu