Monolithic cordierite carrier hydrodechlorination catalyst and preparation method and application thereof

Abstract

The present invention discloses a monolithic cordierite carrier hydrodechlorination catalyst and a preparation method and applications thereof, the monolithic cordierite carrier hydrodechlorination catalyst comprises: a carrier which is a nitrogen-doped carbon-coated monolithic cordierite carrier; an active metal loaded on the carrier, wherein the active metal is selected from at least one of palladium, platinum, iridium and nickel; a second metal loaded on the carrier, wherein the second metal is selected from one of copper, tin, silver and zinc; the catalyst is a coated bimetallic particle with a core-shell structure, the core part is the active metal, and the shell layer is the second metal. The catalyst provided by the invention has high activity and stability, is applied to a hydrodechlorination reaction, and can improve the reaction selectivity.

Description

Technical field[0001]The present invention relates to the field of catalysts, and more particularly to a monochromatic cordierite carrier hydrocarbon chlorination catalyst, and the preparation method thereof, and the use of the integral cordierite carrier hydroblodechlorination in gas phase hydrocarbon. In particular It is the application of trifluoroethylene chloride in trifluoroetholechane.Background technique[0002]The catalytic hydrocarbon-hydrocatalytic hydrocatalytic hydrocarbon reactions of the conventional chemical reduction method have caused people's widespread concern in important monomeric reactions such as fluorine-containing materials, and is considered to be the most economical green, most application prospects. One. At present, the common hydrocarbon chloride catalyst is mainly prepared by the auxiliary of palladium as the main active component, magnesium, cobalt, copper, and ruthenium, which is supported on supported by the activated carbon, silica, magnesium fluorid...

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Problems solved by technology

[0004] European patent EP0747337B1 and Chinese patent CN1065261A disclose a bimetallic composite carbon-supported catalyst, the bimetal is formed by compounding at least one VIII group metal and copper, wherein copper accounts for 12 to 22% of the total mass of the catalyst; the bimetal The composite catalyst can be used in the hydrodechlorination reaction of CFC-113, but the reaction product is chlorotrifluoroethylene and trifluoroethylene or tetrafluoroethylene, and chlorotrifluoroethylene cannot be selectively obtained

European Patent EP0416615A1 discloses Fe, Ni, Cu, Sn, Zn, Cr or their oxides as catalyst active components, silica, magnesium oxide, alumina, zirconia, Y-type zeolite, silica-alumina , silicon carbide, diatomaceous earth, etc. as a carrier catalyst, the catalyst can be applied to CFC-113 hydrodechlorination to prepare chlorotrifluoroethylene, but the selectivity of the catalyst varies greatly when using different active components or carriers, and the highest Only about 80%, which makes the application of this catalyst have certain limitations

[0005] Chinese patent CN1351903A discloses a quaternary catalyst with precious metal ruthenium or palladium or platinum and copper as the main active component, adding lanthanum-rich mixed rare earth or metal lanthanum, and alkali metal lithium as modification aids, and using coconut shell activated carbon as the carrier. Catalyst, the life of the catalyst is about 600 hours, but in the absence of modifying aids, the selectivity of the catalyst is only 70-80%, and the method provided by this patent compares the selection of active components and modifying aids restricted

[0007] The above-mentioned hydrodechlorination catalysts all have low catalytic activity and poor stability. When applied to hydrodechlorination reactions, there is generally a problem of low reaction selectivity. Therefore, it is necessary to develop a catalyst with high activity, high selectivity and stable New catalysts with high performance are particularly important

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