Tianjin University

Gm Global Technolgoy Operations, Inc.

Meiqing Shen

Wei Ping Li

Gongshin Qi

Jianqiang Wang

Jun Wang

Guangxi Wei

Xinquan Wang

The present invention involves micron-scale cerium oxide particles having a multi-cores single-shell structure, comprising: a cerium oxide shell, the shell being composed of crystalline and/or amorphous nano-scale cerium oxide particles; and a plurality of nano-scale cerium oxide grain cores aggregates located in the interior of the shell. Also involved is a preparation method for the micron-scale cerium oxide particle having a multi-cores single-shell structure. A supported catalyst with the micron-scale cerium oxide particles according to the invention as the support have good hydrothermal stability and good sulfur resistance, and the active components of the supported catalyst are not easily embedded, and the supported catalyst has a great application prospect in the field of catalytic oxidation of exhaust emissions such as CO, NO or volatile organic compounds.

Micron-scale cerium oxide particle having multi-core single-shell structure and preparation method therefor

A non-stoichiometric perovskite oxide having the general chemical formula LaMnO, in which the molar ratio of lanthanum to manganese ('X') ranges from 0.85 to 0.95, can be used in particle form as an oxidation catalyst to oxidize NO to NOin an exhaust aftertreatment system for a hydrocarbon-fueled engine. The oxygen content ('Y') fluctuates with variations in the molar ratio of lanthanum to manganese but generally falls somewhere in the range of 3.0 to 3.30. The crystal lattice adjustments spurred by the non-stoichiometric molar ratio of lanthanum to manganese are believed responsible for an enhanced NO oxidative activity relative to similar perovskite oxides with a higher molar ratio of lanthanum and manganese.

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Growing community of inventors

Nankai District, China

Meiqing Shen