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Catalyst for aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch synthesis tail gas and its preparation method and use

A technology of catalysts and mixed hydrocarbons, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to achieve good selectivity, low carbon deposition, and good stability

Active Publication Date: 2014-04-30
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, researchers have not developed such a composite catalyst with both dehydrogenation and aromatization functions.

Method used

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  • Catalyst for aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch synthesis tail gas and its preparation method and use
  • Catalyst for aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch synthesis tail gas and its preparation method and use
  • Catalyst for aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch synthesis tail gas and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare ZSM-5 molecular sieve according to the method described in patent CN102874843A: mix 8g aluminum isopropoxide, 20g tetraethyl orthosilicate, 25g tetrapropylammonium hydroxide (25%wt), and 120g water evenly, then stir and age After 12 hours, dry the aged sol-gel into dry glue, then grind the dry glue into powdery dry glue powder to obtain dry glue seed crystals; mix 30g of aluminum nitrate, 1200g of water glass (27.5wt%) and Prepare a mixed solution with 600g of water, stir evenly, then add all the above-mentioned dry glue seeds to the mixed solution, stir evenly, put the above-mentioned mixed solution with dry glue seeds into the reaction kettle, and statically crystallize at 120°C After 72 hours, the crystallized product was obtained; the crystallized product was taken out, washed with water, dried, and roasted at 600°C for 2 hours to obtain a nano-sized ZSM-5 molecular sieve with a relative crystallinity of 90.7%, a single crystal grain size of 1.5 μm, and stati...

Embodiment 2

[0030] Prepare ZSM-5 molecular sieve according to the method described in patent CN102874843A: 8g of aluminum isopropoxide, 22g of tetraethyl orthosilicate, 27g of tetrapropylammonium hydroxide (25%wt), and 125g of water are evenly mixed, then stirred and aged After 4 hours, dry the aged sol-gel into dry glue, then grind the dry glue into powdery dry glue powder to obtain dry glue seed crystals; mix 30g of aluminum nitrate, 1100g of water glass (27.5wt%) and Make a mixed solution with 570g of water, stir evenly, then add all the above-mentioned dry glue seeds to the mixed solution, stir evenly, put the above-mentioned mixed solution with dry glue seeds into the reaction kettle, and statically crystallize at 130°C After 60 hours, the crystallized product was obtained; the crystallized product was taken out, washed with water, dried, and roasted at 580°C for 4 hours to obtain a nano-sized ZSM-5 molecular sieve with a relative crystallinity of 92.3%, a single crystal grain size of...

Embodiment 3

[0034] Prepare ZSM-5 molecular sieve according to the method described in patent CN102874843A: mix 8g aluminum isopropoxide, 24g tetraethyl orthosilicate, 30g tetrapropylammonium hydroxide (25%wt), and 135g water evenly, then stir and age After 8h, dry the aged sol-gel into dry glue, then grind the dry glue into powdery dry glue powder to obtain dry glue seed; 28g aluminum nitrate, 1050g water glass (27.5wt%) and Make a mixed solution with 450g of water, stir evenly, then add all the above-mentioned dry glue seeds to the mixed solution, stir evenly, put the above-mentioned mixed solution with dry glue seeds into the reaction kettle, and statically crystallize at 150°C After 48 hours, the crystallized product was obtained; the crystallized product was taken out, washed with water, dried, and roasted at 570°C for 6 hours to obtain a nano-sized ZSM-5 molecular sieve with a relative crystallinity of 95.5% and a single crystal grain size of 1.2 μm. The adsorption is 12.2%, the pore...

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Abstract

The invention discloses a catalyst for aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch synthesis tail gas and its preparation method and use. The catalyst comprises a Pt-loading inorganic refractory oxide and a transition metal- and heteropoly acid-modified ZSM-5 molecular sieve according to a weight ratio of 0.3-3.0: 1. The Pt-loading inorganic refractory oxide comprises 0.2-5wt% of Pt2O and the balance an inorganic refractory oxide. The transition metal- and heteropoly acid-modified ZSM-5 molecular sieve comprises 0.5-10wt% of a transition metal oxide, 1.0-15wt% of heteropoly acid and the balance a ZSM-5 molecular sieve. The catalyst can be directly used for an aromatization reaction of mixed low-carbon alkanes and mixed low-carbon olefins separated from Fischer-Tropsch synthesis tail gas, can avoid a raw material dehydrogenation step, and has the advantages of high activity, good selectivity, carbon formation difficulty and good stability.

Description

technical field [0001] The invention relates to a catalyst for the aromatization of low-carbon mixed hydrocarbons in Fischer-Tropsch tail gas, a preparation method and application. technical background [0002] Light aromatics benzene, toluene and xylene (BTX) are widely used in synthetic fibers, synthetic resins, synthetic rubber and various fine chemicals. Toluene and xylene are also important blending components for the production of high-octane gasoline. Due to the rapid development of aromatics downstream products, the demand for aromatics in domestic and foreign markets continues to grow. my country is already a net importer of "triphenyl". 3 million tons. At present, BTX mainly comes from precious metal platinum reforming process and steam cracking ethylene process. Due to the lack of naphtha resources in my country's Gaofang potential, the use of platinum reforming technology to provide BTX is greatly restricted. [0003] The low-carbon alkane resources such as pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J31/34B01J31/36B01J31/28C07C15/04C07C15/06C07C15/08C07C2/76
CPCY02P20/52
Inventor 李德宝刘岩侯博陈从标孙德魁
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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