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Method for preparing difunctional composite catalyst of light aromatics from benzene and synthesis gas in one step

A technology of composite catalyst and light aromatics, which is applied in the field of coal chemical industry, can solve the problems of low benzene conversion rate, no efficient coupling of active sites, low conversion rate, etc., achieve high selectivity, inhibit the formation of ethylbenzene, and catalyze Good performance and stability

Inactive Publication Date: 2019-08-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN104945219A proposes a method for producing toluene and p-xylene from benzene and synthesis gas catalyzed by metal oxide and solid acid, but the conversion rate of benzene is only 15.7%
The reason may be that the conversion rate is not high due to the inefficient coupling of active sites

Method used

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  • Method for preparing difunctional composite catalyst of light aromatics from benzene and synthesis gas in one step
  • Method for preparing difunctional composite catalyst of light aromatics from benzene and synthesis gas in one step
  • Method for preparing difunctional composite catalyst of light aromatics from benzene and synthesis gas in one step

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Co-precipitation method is used to prepare CuO catalyst: under the condition of heating in a water bath at 70°C, add 0.5 mol / L of Cu(NO 3 ) 2 Add 1mol / L of (NH 4 ) 2 CO 3 solution until the pH is 8.5, stop stirring, age at 70°C for 2h, then filter the liquid with suction, wash, dry the obtained solid at 100°C overnight, and then calcinate at 500°C for 6h to obtain CuO catalyst;

[0021] Step 2, using hydrothermal synthesis to synthesize acidic molecular sieves:

[0022] 1) Dissolve 0.05g of sodium hydroxide and 0.1g of aluminum isopropoxide in an appropriate amount of distilled water, stir continuously until they are completely dissolved, then add 15ml of tetrapropylammonium hydroxide (TPAOH) solution to the above mixture, After stirring at room temperature for 2 h, a clear solution A was obtained;

[0023] 2) Add 10ml of tetraethyl orthosilicate (TEOS) dropwise to solution A, and keep stirring for 5 hours to obtain mixed sol B.

[0024] The above-mention...

Embodiment 2

[0030] Step 1: Co-precipitation method is used to prepare CuO catalyst: under the condition of heating in a water bath at 70°C, add 0.5 mol / L of Cu(NO 3 ) 2 Add 1mol / L of (NH 4 ) 2 CO 3 solution until the pH is 8.5, stop stirring, age at 70°C for 2h, then filter the liquid with suction, wash, dry the obtained solid at 100°C overnight, and then calcinate at 500°C for 6h to obtain CuO catalyst.

[0031] Step 2. Use hydrothermal synthesis method to synthesize acidic molecular sieve: 1) Dissolve 0.05g sodium hydroxide and 0.2g aluminum isopropoxide in appropriate amount of distilled water, stir continuously until they are completely dissolved, and then add 10ml of tetrapropyl Ammonium hydroxide (TPAOH) solution was added to the above mixture, and stirred at room temperature for 2 hours to obtain a clear solution A.

[0032] 2) Add 10ml of tetraethyl orthosilicate (TEOS) dropwise to solution A, and keep stirring for 5 hours to obtain mixed sol B.

[0033] The above sol B was ...

Embodiment 3

[0039]Step 1: Co-precipitation method is used to prepare CuO catalyst: under the condition of heating in a water bath at 70°C, add 0.5 mol / L of Cu(NO 3 ) 2 Add 1mol / L of (NH 4 ) 2 CO 3 Solution, until the pH is 8, stop stirring, age at 70°C for 2h, then filter the liquid with suction, wash, dry the obtained solid at 100°C overnight, and then calcinate at 500°C for 6h to obtain CuO catalyst.

[0040] Step 2. Synthesize acidic molecular sieves by hydrothermal synthesis: 1) Dissolve 0.15g of sodium hydroxide and 0.1g of aluminum isopropoxide in an appropriate amount of distilled water, stir continuously until they are completely dissolved, and then add 15ml of tetrapropyl Ammonium hydroxide (TPAOH) solution was added to the above mixture, and stirred at room temperature for 2 hours to obtain a clear solution A.

[0041] 2) Add 12ml of tetraethyl orthosilicate (TEOS) dropwise to solution A, and keep stirring for 5 hours to obtain mixed sol B.

[0042] The above sol B was tra...

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Abstract

The invention relates to the field of coal chemical industry, in particular to a method for preparing a difunctional composite catalyst of light aromatics from benzene and synthesis gas in one step. The difunctional composite catalyst is composed of acidic molecular sieve and a metallic oxide, wherein the mass ratio of the acidic molecular sieve to the metallic oxide is 0.5-10; the acidic molecular sieve is HZSM-5 molecular sieve, and the metallic oxide is one or more of transition metals including Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Mo, In, W and Re. The difunctional composite catalyst is prepared through ball-mill mixing. The difunctional composite catalyst can be used for preparing the light aromatics from carbonic oxide, hydrogen and the benzene through an alkylation reaction.

Description

technical field [0001] The invention relates to the field of coal chemical industry. Background technique [0002] Aromatic compounds are one of the most important bulk chemical raw materials, accounting for one-third of the petrochemical product market. For example, in 2010, global consumption of paraxylene exceeded 28 million tons. These aromatic compounds are mainly used to synthesize polymers such as polystyrene, phenolic resin, polycarbonate, nylon, polyurethane, polyethylene terephthalate fiber, resin and film. At present, the world's demand for benzene derivatives and downstream products is increasing year by year. In the modern chemical industry, the production of aromatic compounds is strongly dependent on petroleum. About 70% of the global supply of toluene and xylene comes from naphtha. There are few studies on the successful synthesis of aromatic compounds from other carbon sources. [0003] Alkylation of benzene with methanol, ethane and alkyl halides can pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J37/03B01J37/10B01J37/08C07C29/154C07C31/04C07C2/86C07C15/06C07C15/08
CPCB01J29/46B01J37/0036B01J37/03B01J37/082B01J37/10B01J2229/18C07C2/864C07C29/154C07C31/04C07C15/06C07C15/08Y02P20/52
Inventor 丁传敏王俊文于波张永康高碧泽冀渐飞
Owner TAIYUAN UNIV OF TECH
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