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A catalyst for the direct preparation of aromatic compounds from synthesis gas and its preparation and application

A technology of aromatic compounds and catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical/physical processes, etc., can solve problems such as escape of intermediate products, inability to activate, react, and uneven concentration distribution of two active sites. Achieve the effects of high aromatics selectivity, low methane selectivity, and simple preparation method

Active Publication Date: 2019-06-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the use of composite catalysts for the direct production of aromatics from syngas still has certain limitations. For example, for intermediate products that are easy to undergo aromatization reactions, such as C2-C5, they still need to undergo several diffusions before entering the aromatization catalyst. The active center is activated and reacted; at the same time, these intermediate products have the opportunity to escape; at the same time, after CO passes through the CO conversion catalyst, CO often cannot continue to be activated and reacted on the second catalyst; in addition, the physical mixing method is easy to cause two kinds of activity The uneven distribution of bit concentration in the reaction system will affect the aromatization reaction of intermediate products to varying degrees
Due to the existence of these problems, the final aromatics selectivity and yield are generally not high

Method used

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  • A catalyst for the direct preparation of aromatic compounds from synthesis gas and its preparation and application
  • A catalyst for the direct preparation of aromatic compounds from synthesis gas and its preparation and application
  • A catalyst for the direct preparation of aromatic compounds from synthesis gas and its preparation and application

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Experimental program
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Effect test

Embodiment 1

[0025] 11.84g ferric nitrate nonahydrate, 0.871g ammonium molybdate tetrahydrate and 0.644g potassium nitrate were dissolved in deionized water, and then impregnated onto 6.67g hydrogen ZSM-5 molecular sieve by equal volume co-impregnation. Rotary evaporation under vacuum to dryness, then drying in air at 120°C for 5h, and then calcining in air at 500°C for 5h, to obtain Catalyst A with iron oxide content of 23.4wt%, molybdenum oxide content of 7wt% and potassium oxide content of 3wt%. , the catalyst morphology is as figure 1 As shown in SEM, the average particle size of the catalyst is around 200nm.

Embodiment 2

[0027] Dissolve 9.39g of ferric nitrate nonahydrate, 1.14g of ammonium molybdate tetrahydrate and 1.06g of manganese nitrate in deionized water, and then impregnate 6.86g of hydrogen-type ZSM-5 molecular sieves in an excess volume co-impregnation method. Rotary evaporation under vacuum to dryness, and then drying in air at 120°C for 5h, followed by roasting in air at 500°C for 5h, to obtain iron oxide content of 18.6wt%, molybdenum oxide content of 8.6wt% and manganese oxide content of 4.2wt%. Catalyst B.

Embodiment 3

[0029] Dissolve 10.15g of ferric nitrate nonahydrate and 1.23g of potassium nitrate in deionized water, impregnate 6.72g of ZSM-5 molecular sieve by equal-volume impregnation method, rotary evaporate to dryness under vacuum, and then dry in air at 120°C for 5h. Next, the obtained sample was impregnated with a solution containing 0.90 g of ammonium molybdate tetrahydrate by an excess volume impregnation method, then evaporated to dryness under vacuum, then dried in air at 120°C for 5 hours, and then calcined in air at 500°C for 5 hours to obtain Catalyst C with an iron content of 20.1 wt%, a molybdenum oxide content of 6.8 wt% and a manganese oxide content of 5.7 wt%.

[0030] 2. The application of the invented catalyst in the conversion of synthesis gas to aromatics.

[0031] The prepared catalyst was shaped, crushed, and sieved under a pressure of 6.5 MPa to obtain a 40-60 mesh sample. Get 0.5g catalyst and place in the reactor of continuous flow, the catalyst before reactio...

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Abstract

The invention discloses a multifunctional catalyst capable of directly converting synthesis gas into aromatic hydrocarbon at one step and a preparation method and application of the multifunctional catalyst. The catalyst comprises one or more oxides in Fe, Mo, Co, Zn and Ga as active components, one or more oxides in Na, K, Ca, Mg, V, Cr, Mn and Cu as assistants, and hydrogen-type ZSM-5 molecular sieve as a carrier. The catalyst is cheap and easily available in raw materials, simple in preparation method and low in cost, has high catalytic activity in synthesis gas and has good industrial application prospect, CO conversion per pass can reach over 80%, and the content of aromatic components in products is not lower than 50%.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas conversion, and relates to a catalyst for directly producing aromatic compounds from synthesis gas through a Fischer-Tropsch synthesis route, as well as its preparation and application. Background technique [0002] Aromatic compounds including benzene, toluene and xylene (BTX) are important chemical basic raw materials, which are mainly derived from petroleum-based production processes, such as naphtha steam cracking for ethylene production and catalysis for gasoline and diesel production reforming or cracking. With the lightening of olefin raw materials, the reduction of crude oil resources and the increasingly prominent environmental problems, it is challenging and unsustainable to obtain aromatic compounds from petroleum routes. Therefore, more and more attention has been paid to the production of aromatics from non-petroleum routes. Based on my country's energy structure rich in coal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48C07C1/04C07C15/02C07C15/04C07C15/06C07C15/08
CPCY02P20/52
Inventor 刘小浩胥月兵刘大鹏
Owner JIANGNAN UNIV
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