La1-xKxMnO3催化剂同时消除柴油机尾气中NO和碳烟性能

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Abstract La₁_-xk_xMnO₃ (x=0, 0.10, 0.15, 0.20, 0.25) perovskite oxide catalysts were prepared by solvothermal method. Various methods such as XRD, FT-IR, SEM, H₂-TPR, XPS and NO-TPD, were used to characterize structure, composition, surface morphology, and the redox properties of the catalysts. Their catalytic performance of the simultaneous NO and soot removal was investigated in a fixed-bed micro-reactor under atmospheric pressure. The results indicated that the La₁_-xK_xMnO₃ catalysts showed perovskite structure. For La₁_-xK_xMnO₃ catalysts, with the partial substitution of La³⁺ by K⁺ in the Mn-based perovskite lattice, a portion of Mn³⁺ was transformed into Mn⁴⁺ and the number of oxygen vacancies was increased, leading to an improvement of the redox properties and NO adsorption performance. As a result, the catalytic reactivity of La_0.80K_0.20MnO₃ catalyst was also improved, achieving the simultaneous removal of NO and soot. The maximum conversion of NO (Xmax NO) and the reaction temperature (T_max) were 46.5% and 436 ℃, respectively. The ignition temperature of soot (T_ig), peak CO₂ formation temperature (Tmax CO₂) and CO₂ selectivity (Smax CO₂) were 341℃, 454℃ and 98.8%, respectively.

Key words： Mn-based perovskite K NO soot

Received: 15 May 2020

PACS:	X701
	O643.3

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	Articles by authors
	ZHAO Yu
	WEI Bo
	ZHANG Peng
	TIAN Yu
	CHI Yao-ling
	WANG Hong
	LI Cui-qing
	SONG Yong-ji

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ZHAO Yu,WEI Bo,ZHANG Peng等. Simultaneous removal of NO and soot from diesel engines over La₁_-xK_xMnO₃ catalysts[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 114-121.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/114

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