Nano alloy modified cerium oxide powder applied to soot combustion reaction, and preparation method thereof

Abstract

The invention discloses a nano alloy modified cerium oxide powder applied to soot combustion reaction, and a preparation method thereof, and relates to cerium oxide powder. The powder is prepared from a platinum nano alloy phase and a cerium oxide or cerium-zirconium mixed oxide carrier. The method comprises the following steps: mixing organic salt of each metal component, and then preparing into a mixed metal ion octyl ether solution or a mixed metal ion dibenzyl ether solution; adding a mixed surfactant to the mixed metal ion octyl ether solution or the mixed metal ion dibenzyl ether solution, so as to obtain a reduction-type mixed metal particle dispersed solution; heating and refluxing the reduction-type mixed metal particle dispersed solution, and then adding a high-polarity alcohol solvent to separate out nano particles in a gathering manner; dispersing into a low-boiling point organic solvent after removing the alcohol solvent in a volatilizing manner, so as to prepare nano alloy disperse precursor solution; putting the carrier into a container, and wetting by using an organic solvent, so as to obtain a wetting vector; injecting the nano alloy disperse precursor solution to the wetting carrier, lastingly stirring until a mobile phase volatilizes, so as to obtain wetting powder; drying and burning, so as to obtain the product.

Description

technical field [0001] The invention relates to cerium oxide powder, in particular to a material preparation technology and method for surface modification of cerium oxide powder with a nano-alloy material with high-efficiency oxygen reduction ability to improve the catalytic oxidation activity of carbon particles, which is used for soot Combustion reaction nano-alloy modified cerium oxide powder and its preparation method. Background technique [0002] Using a particulate filter (DPF) to filter out particulate matter in exhaust gas is the most effective means of removing particulate matter in the exhaust gas treatment technology of diesel internal combustion engines, and has the least impact on the power and economy of motor vehicles. The introduction of a complete oxidation catalyst in the device can reduce the thermal decomposition temperature of soot particles to 150-400°C, so as to effectively prevent excessive accumulation of carbon particles on the filter and cause fi...

AI Technical Summary

Problems solved by technology

Soot combustion catalysts with platinum group noble metals as the main catalyst have the advantages of catalytic oxidation efficiency (including four-way catalytic activity) and low-temperature light-off, so they are often used in the design of practical soot combustion catalyst systems, such as Chinese patent CN102240544A And CN102794175A disclosed precious metal type catalyst, yet, because precious metal is expensive and resource is scarce, so this type catalyst is subjected to the severe restriction of raw material cost in commercialization process

Practical catalytic systems usually use the assistance of active supports to increase the reaction accessible area of ​​noble metal components. However, due to the limitation of the intrinsic oxygen reduction characteristics of noble metals, the conversion frequency of single reaction sites still does not improve in this improved way.

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