Method for preparing reforming catalyst

Abstract

The invention provides a method for preparing a reforming catalyst. The catalyst comprises the following active components calculated on the basis of the weight of a dry-basis alumina carrier: 0.01 to 2.0 percent of platinum group metals, 0.01 to 3.0 percent of VIIB group metals, 0.01 to 2.0 percent of third metal components and 0.1 to 5.0 percent of halogen. The third metal components are selected from rare earth elements or IIIA, IVA or VA group metals; the active components are introduced into the alumina carrier through fractional impregnation or co-impregnation, wherein impregnation liquid prepared from platinum group metals introduced into the carrier contains dispersant; the dispersant is selected from C1-C3 alcohol, organic acid, nitrogen-containing compounds or a mixture thereof; and the organic acid is formic acid, oxalic acid, tartaric acid, citric acid or acrylic acid. The reforming catalyst prepared by the method has the advantages of high activity stability and aromatic selectivity.

Description

technical field [0001] The invention is a preparation method of a reforming catalyst. Specifically, it is a method for preparing a multi-metal reforming catalyst containing platinum and rhenium. Background technique [0002] Catalytic reforming is an important process for the production of high-octane gasoline components and aromatics from naphtha fractions, while producing cheap hydrogen as a by-product. In recent years, with the increasing social demand for reformed products, the production capacity of catalytic reforming units in the world has increased year by year, among which semi-regenerative reforming units still occupy a dominant position. Mass production has been widely used. [0003] At present, the semi-regenerative reforming catalyst commonly used in industry is a platinum-rhenium bimetallic catalyst. Although the addition of rhenium components can greatly increase the stability of the catalyst, it also increases the hydrogenolysis activity of the catalyst, re...

AI Technical Summary

Problems solved by technology

The catalyst has the characteristics of high activity and good selectivity, but the preparation method is cumbersome. The catalyst obtained after treatment with sodium polyacrylate needs to be roasted in stages in a nitrogen atmosphere. After the treatment, it must be washed with water to remove sodium ions to obtain the final catalyst.

If the catalyst is not handled well during the activation process, the decomposition of sodium polyacrylate will not be complete, which will easily cause the catalyst to contain carbon and reduce the performance of the catalyst.

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