A kind of molecular sieve catalyst for the catalytic cracking of MTP by-product hydrocarbons and its preparation method

A technology of molecular sieves and catalysts, which is applied in the field of molecular sieve catalysts and their preparation, can solve problems such as separation difficulties, thermal stability and hydrothermal stability reduction of nano-molecular sieves, and achieve rich structural features, good catalytic cracking effect, and reduction of side effects such as aromatics. The effect of product formation
CN106669790BActive Publication Date: 2019-07-23CHNA ENERGY INVESTMENT CORP LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHNA ENERGY INVESTMENT CORP LTD
Publication Date
2019-07-23

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Abstract

The invention provides a molecular sieve catalyst used for the catalytic cracking of MTP by-product hydrocarbons and a preparation method thereof. In particular, it relates to a preparation method of a modified ZSM-5 molecular sieve catalyst, which includes the steps of: a. combining a silicon source, an aluminum source, Organic template, alkali and deionized water are prepared to synthesize silica-alumina gel, and then hydrothermal crystallization is performed in a closed reaction vessel to prepare a modified ZSM-5 molecular sieve precursor; b. Add organosilane ammonium salt to the obtained precursor. aqueous solution of TPXA+ and mix evenly; c. Adjust the pH of the system obtained in step b to 10-12 and continue crystallization at 150-180°C; d. Exchange and roast the product obtained in step c to obtain the final product. The catalyst of the invention is used for catalytic cracking of MTP by-product hydrocarbons and has the advantages of high selectivity to low-carbon olefins and long service life.
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Description

technical field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a molecular sieve catalyst used for catalytic cracking of MTP by-product hydrocarbons and a preparation method thereof. Background technique

[0002] With the development of the global economy, the demand for low-carbon olefins is increasing, and oil resources are increasingly scarce. The recent implementation of the coal-based methanol-to-olefins (MTP) project can effectively alleviate the shortage of naphtha and low-carbon oil in my country. The degree of dependence of olefins on the international market. MTP technology uses coal as raw material to produce propylene through dehydration of methanol and dimethyl ether. It is currently the most mature and economical production technology to replace petroleum route to produce propylene. The by-products are gasoline, liquefied gas and a small amount of ethylene and other hydrocarbons. compound.

[0003] As a new chemi...

Claims

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