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Dehydrogenation catalyst as well as preparation method and application thereof

A technology of dehydrogenation catalyst and auxiliary agent, applied in the field of alkane dehydrogenation, can solve the problems of catalyst coke deposition, deactivation, expensive catalyst, etc., and achieve the effects of improving stability and mild reaction conditions

Pending Publication Date: 2022-01-11
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above methods all use high content of Pt as the active metal, the catalyst is expensive, and most of the catalyst supports are γ-Al 2 o 3 As a carrier, it has strong acidity, which makes the catalyst carbon deposit serious and deactivated quickly

Method used

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  • Dehydrogenation catalyst as well as preparation method and application thereof

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preparation example Construction

[0031] The present invention provides the preparation method of dehydrogenation catalyst described in above-mentioned scheme, comprises the following steps:

[0032] Na-type ZSM-5 molecular sieves are impregnated into a solution containing a Pt precursor, dried and calcined to obtain a dehydrogenation catalyst;

[0033] The mass of Pt in the solution corresponds to the content of noble metal Pt in the dehydrogenation catalyst.

[0034] In the present invention, the Na-type ZSM-5 molecular sieve is preferably obtained by self-preparation. The present invention has no special requirements for the preparation method of the Na-type ZSM-5 molecular sieve, and the Na-type ZSM-5 molecular sieve well-known in the art is used. method. In an embodiment of the present invention, the preparation method of the Na-type ZSM-5 molecular sieve preferably includes: adding sodium hydroxide, aluminum nitrate, tetrapropylammonium hydroxide, ethyl orthosilicate and water into the crystallization tan...

Embodiment 1～3

[0042] The preparation method of Na type ZSM-5 molecular sieve used in embodiment 1~3 is as follows:

[0043] 1.54g sodium hydroxide, 0.24g aluminum nitrate, 23.42g tetrapropylammonium hydroxide, 40g tetraethyl orthosilicate and 86.2gh 2 Add O into the crystallization kettle, then stir at room temperature for 20min, crystallize in a homogeneous reactor at 170°C for 2 days, filter, dry overnight at 80°C, and roast in a muffle furnace at 580°C for 12h to synthesize Si / Al Na type ZSM-5 molecular sieve with a ratio of 200.

Embodiment 4～6

[0044] The preparation method of Na type ZSM-5 molecular sieve used in embodiment 4~6 is as follows:

[0045] Add 1.54g of sodium hydroxide, 0.48g of aluminum nitrate, 23.42g of tetrapropylammonium hydroxide, 40g of tetraethyl orthosilicate and 86.2g of water into the crystallization tank and stir at room temperature for 20min. After internal crystallization for 2 days, filter, dry overnight at 80°C, and calcine in a muffle furnace at 570°C for 14 hours, the Na-type ZSM-5 molecular sieve with a Si / Al ratio of 100 can be synthesized.

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Abstract

The invention provides a dehydrogenation catalyst as well as a preparation method and application thereof, and belongs to the technical field of alkane dehydrogenation. The dehydrogenation catalyst comprises a carrier and an active component loaded on the carrier; the carrier is a Na type ZSM-5 molecular sieve; the active component is precious metal Pt; and the mass content of the active component in the dehydrogenation catalyst is 0.05-0.3%. According to the catalyst disclosed by the invention, the content of active precious metal Pt is reduced, the preparation cost of the catalyst is saved, the catalyst has super-long service life in a reaction for preparing dodecamonoolefine through dehydrogenation of n-dodecane, and meanwhile, the selectivity of dodecamonoolefine can be improved.

Description

technical field [0001] The invention relates to the technical field of alkane dehydrogenation, in particular to a dehydrogenation catalyst and its preparation method and application. Background technique [0002] Long-chain alkanes generally refer to straight-chain alkanes with more than 10 carbon atoms. The dehydrogenation of long-chain n-alkanes to long-chain monoolefins is an important operation unit in the petrochemical industry chain. Among them, long-chain n-dodecane is one of the typical representatives of long-chain alkanes, and its dehydrogenation product long-chain n-dodecamonoolefin (hereinafter referred to as dodecane) is the key to the preparation of dodecylbenzenesulfonate Intermediate product, mainly used in the synthesis of surfactants, detergents and emulsifiers. The synthesis of dodecylbenzenesulfonate from dodecane has the advantages of high atom utilization rate, less discharge of three wastes, and meets the requirements of green chemical industry. Ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J29/46B01J35/02C07C5/333C07C11/02B01J35/00
CPCB01J29/44B01J29/46C07C5/3332B01J2229/18C07C2529/46C07C2529/44B01J35/393B01J35/40C07C11/02
Inventor 朱善辉樊卫斌何月董梅
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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