Method for improving catalytic property of methane aromatization catalyst

Abstract

The invention relates to a method for improving the catalytic property of methane aromatization catalyst, belonging to the technical field of molecular sieve catalysis. The invention is characterized in that on the condition of no-second template, the crystal growth of zeolite molecular sieve is controlled by reasonablely controlling zeolite molecular sieve synthesis conditions such as synthesis formulation, charging sequence, ageing time, crystallization temperature, crystallization time and the like, small molecular sieve crystal is used for assembly and intergrowth to form MCM-22 and ZSM-5 molecular sieve assembly with multi-stage pore path structure, Mo or Re used can be adopted as active component to perform loading and modification to the prepared molecular sieve assembly, and the invention provides Mo-based MCM-22 and ZSM-5 molecular sieve assembly catalysts and an application thereof in methane non-oxidative aromatization reaction. The effects and the benefits of the invention is that the operation is simple, the cost is low and in methane non-oxidative aromatization reaction, the multi level structure assembly catalyst prepared by the method of the invention has better catalytic performance compared with the traditional catalyst.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve catalysis, and relates to a method for improving the catalytic performance of a methane aromatization reaction catalyst, in particular to improving catalytic performance by directly preparing a molecular sieve assembly catalyst with a multi-level pore structure without a second template. performance method. Background technique [0002] Methane is the main component of natural gas and coalbed methane. The latest proven reserves show that the total reserves of methane in the world are very rich, even greater than the sum of oil and coal. As a hydrocarbon species similar to coal and petroleum, natural gas with methane as the main component will become one of the important energy sources in this century. How to use high-tech and efficient use of natural gas is a major strategic measure to alleviate the contradiction between oil supply and demand, solve the oil crisis, and ensure my country's...

AI Technical Summary

Problems solved by technology

[0004] However, since the oxygen-free aromatization of methane needs to be carried out at a temperature above 700°C, the low conversion rate and serious carbon deposition problems lead to catalyst deactivation, which greatly restricts the industrial development of the oxygen-free aromatization of methane.

Therefore, the majority of researchers have conducted a lot of research on how to improve the stability of the catalyst and how to reduce carbon deposition, such as by adding various types of metal additives, changing the type of molecular sieve carrier or performing special post-treatment on molecular sieves. Add a small amount of CO, CO to the gas 2 、H 2 O impurities and other methods to improve the activity and stability of the aromatization reaction of the catalyst, and achieved certain results, but still not satisfactory enough

In addition, so far, there has been no related report on improving the catalytic performance of methane anaerobic aromatization catalysts by directly preparing molecular sieves with hierarchical pore structures and applying them to methane anaerobic aromatization reactions

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