Preparation method of C10+ bicyclo-heavy aromatics selective hydrogenation cracking catalyst

Abstract

The invention relates to a preparation method of a C10+ bicyclo-heavy aromatics selective hydrogenation cracking catalyst. The preparation method comprises the following steps of adding a surface active agent into an ethanol solution of nanometer lanthanum, cerium and yttrium oxides, uniformly stirring the mixture, slowly dropwise adding H2PtCl4 and / or H2PdCl4 solution under a microwave stirring condition, and forming stable metal colloid; loading the metal colloid on a carrier; drying the obtained catalyst in the shade under a room-temperature condition for 36 to 54 hours, and then drying the catalyst in an oxygen-free atmosphere at the temperature of 80DEG C to 180DEG C. The catalyst adopts one or two of Y molecular sieve and aluminum dioxide as the carrier, one or two of platinum and palladium as a main agent and one or more of lanthanum, cerium and yttrium as assistant, wherein based on the catalyst, the content of the main agent is 0.01 to 0.1 percent by weight, the content of the assistant is 1 to 5 percent by weight, and in the C10+ heavy aromatics selective hydrogenation cracking reaction, the catalyst has the characteristics of high hydrogenation reaction activity, high single-loop saturation selectivity and high liquid yield.

Description

technical field [0001] The present invention relates to C 10 + Selective Hydrogenation of Bicyclic Heavy Aromatics to C 8 ~C 9 In the field of aromatic hydrocarbon mixtures, specifically to provide a C with high activity and high monocyclic saturation selectivity 10 + A preparation method of a catalyst for selective hydrocracking of heavy aromatics. Background technique [0002] The production capacity of aromatics in my country is seriously insufficient, and a large amount of them needs to be imported from abroad. Heavy aromatics above carbon nine produced by refineries including steam cracking units and continuous reforming units are valuable petrochemical resources. The production of BTX from heavy aromatics is an important method for the comprehensive utilization of heavy aromatics. The utilization rate of heavy aromatics in my country is still relatively low. For a long time, a large amount of heavy aromatics have been blended into gasoline and burned, resulting ...

AI Technical Summary

Problems solved by technology

This method overcomes the defect that the main agent and the auxiliary metal particles are easy to wrap each other when the traditional metal colloid method is used to prepare the catalyst. Under microwave conditions, the main agent Pt / Pd salt is first reduced to nano-element Pt by using solvent ethanol and uniformly distributed on the nano-rare earth. Oxide crystal (auxiliary) surface

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