Catalyst for catalyzing ethane to prepare ethylene or oxygen-containing compound as well as preparation method and application of catalyst

By loading Ti on the MWW molecular sieve and combining Au and/or Pd catalysts, H2 and O2 are used to generate H2O2 in situ, the problems of high activation temperature and insufficient selectivity are solved, and the effect of efficient catalyzing the preparation of acetic acid, acetaldehyde or ethanol at low temperatures is achieved.

CN120268450APending Publication Date: 2025-07-08WUHAN INST OF TECH
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Patent Information

Application Number
CN202510516741.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-23
Publication Date
2025-07-08

AI Technical Summary

Technical Problem

The prior art is difficult to efficiently catalyze ethane for the preparation of ethylene or oxygen-containing compounds under low temperature conditions, and traditional catalysts have problems with limited activation ability and insufficient selectivity.

Method used

Based on the MWW structure of silicon boron type or silicon-aluminum type molecular sieve, Ti is loaded by atomic in-situ transplantation method, combined with Au and/or Pd, a catalyst with a silicon-titanium framework structure is formed, and H2O2 is used to generate H2O2 in situ, and ethane is activated to form an oxygen-containing compound or ethylene.

Benefits of technology

It is achieved efficient catalytic conversion of ethane to high added value acetic acid, acetaldehyde or ethanol at lowering the ethane activation temperature, which improves the selectivity and activity of the catalyst and provides a new catalytic pathway.

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Abstract

The invention discloses a catalyst for catalyzing ethane to prepare ethylene or an oxygen-containing compound as well as a preparation method and application of the catalyst, and belongs to the field of catalysts. On the basis of ERB-1 and MCM-22, a large number of hydroxyl structures are formed through post-treatment of nitric acid or ammonium nitrate; a titanium source and molecular sieve silicon hydroxyl are subjected to a dehydrohalogenation reaction in a titanium halide gas form to form a Ti-O-Si bond, so that titanium successfully enters a molecular sieve framework and is uniformly distributed. Au or Pd is anchored by a framework Ti, Au or Pd is loaded by using a deposition-precipitation method, and the introduced Ti species can provide a better environment for further dispersing Au or Pd by changing isoelectric points on the surface of a molecular sieve carrier, so that the size of Au or Pd nanoparticles is controlled; secondly, due to the high specific surface area of the MWW molecular sieve, the gold precursor can be effectively dispersed, and agglomeration is inhibited; compared with an MWW molecular sieve of pure Si, Au or Pd nanoparticles can be dispersed and anchored by introducing a framework Ti, so that an Au and Pd-based catalyst which is about 2nm in size and good in dispersion is prepared.
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