Preparation method of cerium-zirconium based solid solution

Abstract

The invention discloses a preparation method of a cerium-zirconium based solid solution. The preparation method comprises the following sequential steps: (1) preparation of Ce<4+>; (2) preparation of active ingredient solution; (3) precipitation reaction; (4) surface modification; (5) roasting. The Ce<4+> is prepared firstly and then mixed with other rare earth ions and positively quadrivalent zirconium ions to obtain a mixed metal nitrate solution; as the mixed metal nitrate solution contains an organic complexing agent, the precipitation speed in the precipitation reaction process is controlled by virtue of complexing coordination of the organic complexing agent and the rare earth and zirconium ions, so that a precursor uniform and stable in particle size is obtained; the surface treatment is performed on the precipitate precursor by use of polyacrylic acid, and therefore, the agglomeration problem of particles in the roasting process is solved, and the pore diameter and the pore volume of the roasted product are increased, and consequently, the cerium-zirconium based solid solution catalytic material excellent in heat stability is obtained. The preparation method is suitable for the preparation of the solid solutions.

Description

technical field [0001] The invention belongs to the field of catalysts, and relates to a method for preparing a catalytic material for purifying motor vehicle exhaust, in particular to a method for preparing a cerium-zirconium-based solid solution. Background technique [0002] Reducing vehicle exhaust pollution, protecting the quality of the atmospheric environment, and realizing the sustainable development of the ecological environment and society are one of the important issues of my country's environmental protection at present and in the future for a long time. [0003] In order to reduce pollution, breakthroughs must be made in three aspects: improving the quality of gasoline, improving the combustion state of the engine, and increasing the catalytic efficiency of exhaust gas purification. So far, the most effective way to use automobile exhaust purification catalysts is to reduce the content of three toxic gases HC, CO and NOx in exhaust gas through three-way catalyti...

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Problems solved by technology

However, the above-mentioned preparation method requires high-pressure equipment through hydrothermal treatment, which is not conducive to industrial production.

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