Composite catalyst for synthesizing benzene through methane anaerobic aromatization and preparation method and application thereof

Abstract

The invention provides a composite catalyst for synthesizing benzene through methane anaerobic aromatization and a preparation method and application thereof. The catalyst comprises a Mo base solid phase catalyst and a hydrogen absorption material, the Mo base solid phase catalyst comprises a molecular sieve carrier and an active component Mo, an auxiliary M1 and an auxiliary M2 loaded on the molecular sieve carrier; the M1 is Fe or Co or Ni or Ru, and the M2 is Mg or Mn or Cu or Rh; the hydrogen absorption material is Zr or Ti or ZrTi alloy. By mass, the contents of Mo, M1 and M2 in the Mo base solid phase catalyst are 2-10%, 0.1-1.5% and 0.05-0.5% respectively, and the mass ratio of the Mo base solid phase catalyst to the hydrogen absorption material is 1:(1-3). The catalyst remarkably increases the methane conversion rate and the yield of the product benzene.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts, and in particular relates to a catalyst for methane aromatization, and more particularly to a composite catalyst for synthesizing benzene by anaerobic aromatization of methane and its preparation method and application. Background technique [0002] In recent years, shale gas and coalbed methane have been developing vigorously in the world. They have gone through the research of shale gas geological conditions, the selection of "sweet spots" and the drilling of evaluation wells and the preliminary preparations for exploration and development, to the industrial exploitation test of marine shale gas, and the transition between land and sea. There are two development stages of exploration and evaluation of shale gas, namely, marine shale gas and continental shale gas, and they are advancing in an orderly manner to the large-scale exploitation of marine shale gas, and the experimental stage...

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Problems solved by technology

However, the reaction is limited by thermodynamics and the methane conversion rate is low. In order to solve this problem, researchers have tried to add various metal additives to improve the activity and stability of the catalyst. For example, Xu Yide et al. reported in the patent document CN1167653 that methane was The aromatization process is carried out under the action of the Mo-R / HZSM-5 catalyst with the second component R (R=La, Ce, Pr, Nd), but the thermodynamic limit cannot be broken, and the methane conversion rate is still low

[0006] At present, a lot of work has been done on the aromatization of pure methane at home and abroad, but there are no reports involving composite catalysts

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