A kind of precious metal hydrogenation catalyst and its preparation method and application

Abstract

The invention discloses a preparation method of a precious metal hydrogenation catalyst. The preparation method comprises the following steps: (1) roasting the original clay soil at high temperature, then enabling the roasted original clay soil to react with mixed acid, and pulping to prepare slurry, wherein the mixed acid is a mixture of strong acid and weak acid; (2) adding a Y type molecular sieve to the slurry in the step, stirring uniformly, adding an aluminum-containing acid solution and an alkaline solution under a parallel flow condition, carrying out a gel forming reaction, and after gel forming, carrying out ageing, filtering, washing and drying to obtain silicon-containing alumina powder; (3) adding an adhesion agent to the silicon-containing alumina powder prepared in the step (2), and carrying out extrusion molding, drying and baking to obtain a silicon-containing alumina supporter; (4) preparing a noble metal aqueous solution containing esters and organic acid, adding the supporter prepared in the step (3) to the solution to be impregnated, and after impregnation, drying and roasting to obtain the precious metal hydrogenation catalyst. The catalyst has the advantages of small active component crystal grain, low dispersity, low strong acid center and the like; the catalyst can be used for paraffin hydrogenation production to produce a food-grade paraffin product.

Description

technical field [0001] The invention relates to a noble metal hydrogenation catalyst and its preparation method and application, in particular to an alumina-based noble metal paraffin deep refining catalyst for hydrogenation and its preparation method and application. Background technique [0002] With the heavy and inferior quality of crude oil and the increasing quantity of imported crude oil, the sources of paraffin hydrorefining raw materials are diversified. Coupled with factors such as the use of various additives in the oil recovery process and the fluctuations in the production process of some refineries, the quality of paraffin wax raw materials has become more and more obvious. At the same time, with the birth of the new paraffin wax standard, the smell of food-grade paraffin wax has been reduced from 1 to 0 in the original standard. Some refineries use clay for supplementary refining or pre-refining, resulting in an increase in processing costs and a decrease in p...

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Problems solved by technology

The above existing paraffin hydrogenation technologies generally have the problem that the product quality cannot meet the requirements during long-term operation

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