Pr掺杂Ni~(Ce-Zr)O2/Al2O3用于三效催化(TWC)反应:缺陷性质-活性关系

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Abstract To investigate the influence of defect structures in CeZrO_x catalysts, which induced by rare earth metal doping, on the control of automotive exhaust pollution, series of Ni~(Ce₆Zr_4-xPr_x)O₂/Al₂O₃ catalysts with varied Pr doping content were synthesized, and their TWC activities and SO₂ resistance performance were tested. The prepared catalysts were also systematically characterized. The collected results suggested that two kinds of defects in Ni~(Ce-Zr)O₂/Al₂O₃ were generated after Pr doping, including oxygen vacancies (O_v) and lattice distortion, whose types and concentrations depended on the Pr doping content. The results also indicated that O_v play a vital role on the catalytic performance, whereas lattice distortion play a small effect on it. In addition, it is found that the concentrations of O_v in as-prepared catalysts determined their TWC catalytic performance, the Ni~(Ce₆Zr₃Pr₁)O₂/Al₂O₃ catalyst with most O_v concentrations performed superior three-way catalytic performance at 200~600℃ and also exhibited excellent anti-sulfur poisoning performance after introducing 100ppm SO₂ at 600℃. This is because O_v not only promoted the dispersion of NiO, accelerating the migration and diffusion of bulk oxygen to form active oxygen species, thus promoting the adsorption and oxidation of CO and HC species on the catalyst, but also the O_v can weaken the N-O bonds boosting the dissociative adsorption and reduction of NO species.

Key words： Ni~(Ce-Zr-Pr)O₂ Pr-doped oxygen vacancy (Ov) lattice distortion defect properties-activity relationship

Received: 13 March 2023

PACS:

X703.5

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	Articles by authors
	ZHANG Tong
	LI Qiao-yan
	WANG Xiao-yan
	LIANG Mei-sheng
	LAI Zhuo-jun

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ZHANG Tong,LI Qiao-yan,WANG Xiao-yan等. Pr-doped Ni~(Ce-Zr)O₂/Al₂O₃ for TWC reaction: Defect property-activity relationship[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5157-5169.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5157

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