Alumina coats pulp and preparation method thereof

Abstract

The invention relates to alumina coat slurry and a preparation method thereof, and mainly solves the problems of the prior art of poor stability of a prepared laminar composite carrier and short service life of a prepared thin-shelled noble metal catalyst. The alumina coat slurry comprises the following components: aluminum sol with an average granularity of less than 20 micrometres, active alumina, an organic adhesive, an inorganic adhesive, a surfactant, a pH modifying agent and the balance being water, wherein the average granularity of the slurry is less than 10 micrometres. The preparation method comprises the following steps: dissolving the aluminum sol, the organic adhesive, the surfactant and the pH modifying agent in water; mixing the mixture evenly with stirring at a high speed;then adding the inorganic adhesive and active alumina powder for high-speed dispersion; and regrinding the obtained alumina coat slurry to prepare the alumina coat slurry. Thus, the preparation method better solves the problems by adopting the technical proposal, and can be used in the industrial production of laminar composite carrier.

Description

Alumina coating slurry and preparation method thereof technical field The invention relates to an alumina coating slurry and a preparation method thereof. Background technique At present, a considerable part of catalysts used in chemical industry and oil refining process and automobile exhaust gas are supported catalysts using noble metals as active components. Because precious metals are expensive, their content in catalysts tends to be low. Studies have found that the non-uniform distribution of active components in the carrier can reduce the amount of precious metals and improve the utilization of precious metals; at the same time, in many reactions, catalysts with non-uniform distribution also show better activity, selectivity and life. The most important one is the eggshell catalyst, that is, the surface thin shell type in which the active components are concentrated on the surface of the carrier. Such as automobile exhaust gas purification catalyst, CN1342520 inv...

AI Technical Summary

Problems solved by technology

One of the technical problems to be solved by the present invention is the poor stability of the layered composite carrier and the short service life of the thin shell-shaped noble metal catalyst in the prior art. A new alumina coating slurry is provided

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