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Supported catalyst, preparation method and applications thereof

A supported catalyst and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems that have not been found to synthesize isobutylene with high selectivity from methyl bromide, and the selectivity of a single product is not high, and achieve the preparation method Simple, mild reaction conditions, easy industrialization effect

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the technology with higher value-added low-carbon olefins as the target product, the selectivity of a single product is not high, and no relevant reports have been found on the synthesis of isobutene with high selectivity from methyl bromide

Method used

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  • Supported catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 50g of hydrogen-type ZSM-5 molecular sieve (silicon-aluminum ratio 50), add it to 125mL magnesium nitrate solution with a concentration of 0.5mol / L, let it stand for 8h, then dry at 110°C for 10h, and roast at 550°C for 4h to obtain magnesium Modified ZSM-5 molecular sieve with a content of 3%.

[0031] Dissolve zirconium nitrate in deionized water to prepare a 0.5mol / L solution, add an appropriate amount of polyethylene glycol 400, mix well, add the mixed solution dropwise to 10% ammonia water at a speed of 3ml / min, and drop Stir while adding. When the pH value of the solution is 9.1, a stable and uniform solution is formed. Continue to stir for 12 hours. The obtained colloid is washed with deionized water, filtered with suction, and dried at 100°C for 12 hours. The obtained powder is calcined at 400°C for 4 hours. Zirconia is produced.

[0032] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on Mg-modified ZSM-5 molec...

Embodiment 2

[0035] Weigh 50g of hydrogen-type ZSM-5 molecular sieve (silicon-aluminum ratio 50), add it to 125mL magnesium nitrate solution with a concentration of 0.5mol / L, let it stand for 8h, then dry at 110°C for 10h, and roast at 550°C for 4h to obtain magnesium Modified ZSM-5 molecular sieve with a content of 3%.

[0036] Dissolve cerium nitrate in deionized water to prepare a 0.5mol / L solution, add an appropriate amount of polyethylene glycol 400, mix well, add the mixed solution dropwise to 10% ammonia water at a speed of 3ml / min, and drop Stir while adding, when the pH value of the solution is 9.8, a stable and uniform solution is formed, continue to stir for 15 hours, wash the obtained colloid with deionized water, suction filter, dry at 120°C for 10 hours, and roast the obtained powder at 500°C for 4 hours, that is Cerium oxide is produced.

[0037] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on Mg-modified ZSM-5 molecular sieve ...

Embodiment 3

[0041] Weigh 50g of hydrogen-type ZSM-5 molecular sieve (silicon-aluminum ratio 50), add it to 125mL magnesium nitrate solution with a concentration of 0.5mol / L, let it stand for 8h, then dry at 110°C for 10h, and roast at 550°C for 4h to obtain magnesium Modified ZSM-5 molecular sieve with a content of 3%.

[0042] Dissolve titanium nitrate in deionized water to prepare a 0.5mol / L solution, add an appropriate amount of polyethylene glycol 400, mix well, and add the mixed solution dropwise to 0.1mol / L ammonium carbonate solution at a speed of 3ml / min , stirring while adding dropwise, when the pH value of the solution is 9.3, a stable and uniform solution is formed, and the stirring is continued for 10 hours. The obtained colloid is washed with deionized water, filtered with suction, and dried at 90°C for 15 hours. Roasting 4h, namely the preparation of titanium oxide.

[0043] Weigh an appropriate amount of zinc nitrate and dissolve it in deionized water, and load it on Mg-mo...

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Abstract

The invention discloses a supported catalyst, its preparation method and application. The supported catalyst is composed of zinc oxide, zinc bromide, additive oxide and magnesium-modified hydrogen-type ZSM-5 molecular sieve carrier. According to the weight content of the catalyst, the content of zinc oxide is 0.5%-20%. The zinc content is 10%-50%, and the weight content of the auxiliary oxide in the catalyst is 0.1%-10% in terms of metal elements. The preparation method of the catalyst comprises the following process: (1) treating the hydrogen ZSM-5 molecular sieve with a magnesium salt solution to obtain a magnesium-modified ZSM-5 molecular sieve carrier; (2) introducing zinc oxide into the magnesium-modified hydrogen Type ZSM-5 molecular sieve carrier; (3) carry out bromination treatment on the carrier after introducing zinc oxide; (4) prepare auxiliary oxide; (5) introduce auxiliary oxide into step (3) brominated in the material. The catalyst can convert methyl bromide into isobutene with high selectivity.

Description

technical field [0001] The invention relates to a supported catalyst and its preparation method and application, in particular to a supported catalyst with modified ZSM-5 molecular sieve as a carrier, its preparation method and application. Background technique [0002] Isobutene is an important basic organic chemical raw material. Its derivative products are numerous, the upstream and downstream industrial chains are complicated, and the consumption structure shows a trend of diversification. A variety of high value-added products can be prepared from isobutylene, such as: butyl rubber, polyisobutylene, methyl tert-butyl ether, isoprene and organic glass and other organic chemical raw materials and fine chemical products. As the market scale of isobutene downstream products continues to expand, the contradiction between supply and demand will gradually become prominent, especially in the context of the depletion of oil resources, the output of isobutene has become a key bot...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C11/09C07C1/26
Inventor 张信伟张舒冬李杰孙晓丹倪向前尹泽群刘全杰张喜文
Owner CHINA PETROLEUM & CHEM CORP
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