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Catalyst for synthesizing aromatic hydrocarbon and preparation method and application of catalyst

A technology for catalysts and aromatics, which is applied in the field of catalysts for the synthesis of aromatics and its preparation and application. It can solve the problems of restricting large-scale industrial applications, no aromatics are found, and it is difficult to produce, so as to inhibit the reverse water gas shift reaction and reduce energy consumption. Problems, the effect of high utilization efficiency

Active Publication Date: 2019-11-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methanol-to-aromatics technology generally uses acidic ZSM-5 molecular sieve catalysts modified by metals such as zinc, gallium, and silver. However, the selectivity of aromatics decreases rapidly and the catalyst life is short, which restricts the large-scale industrial application of the methanol-to-aromatics technology.
[0004] Due to the high degree of unsaturation and complex molecular structure of aromatic hydrocarbons, it is difficult to prepare in a strong reducing reaction environment
So far, no research reports have been found on the direct high-selectivity production of aromatics by hydrogenation of carbon dioxide

Method used

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  • Catalyst for synthesizing aromatic hydrocarbon and preparation method and application of catalyst
  • Catalyst for synthesizing aromatic hydrocarbon and preparation method and application of catalyst
  • Catalyst for synthesizing aromatic hydrocarbon and preparation method and application of catalyst

Examples

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Effect test

Embodiment 1

[0062] 95g Zn(NO 3 ) 2 6H 2 O and 80g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. Dissolve 25g of ammonium carbonate in 200ml of deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and alkali solution respectively. The temperature of the precipitation reaction is controlled at 60°C, the pH value is 7.2, and it is aged at this temperature for 4 hours. Calcined for 4 hours to obtain zinc-aluminum spinel oxide, coded as A. X-ray fluorescence spectroscopic analysis (XRF) shows Zn / Al (molar ratio)=1: 1 in A, XRD figure is as follows figure 1 As shown, the TEM image is shown in figure 2 shown.

Embodiment 2

[0064] 48g Zn(NO 3 ) 2 6H 2 O and 80g Al(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. 25g ammonia water (containing 25% NH 3 ) was dissolved in 200ml deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and alkali solution respectively. The temperature of the precipitation reaction is controlled at 70°C, the pH value is 7.5, and it is aged at this temperature for 6 hours. After filtering and washing, dry at 100°C for 24 hours, Calcined for 4 hours to obtain zinc-aluminum spinel oxide, coded as B. XRF showed that Zn / Al (molar ratio) in B=1:2.

Embodiment 3

[0066] 10.6g Zn(NO 3 ) 2 6H 2 O and 80gAl(NO 3 ) 3 9H 2 O was dissolved in 200ml deionized water to prepare a saline solution. Dissolve 25g of sodium carbonate in 200ml of deionized water to prepare an alkaline solution. Use two peristaltic pumps to mix and co-precipitate the salt solution and the alkali solution respectively. The temperature of the precipitation reaction is controlled at 80°C, the pH value is 7.8, and it is aged at this temperature for 6 hours. Calcined for 6 hours to obtain zinc-aluminum spinel oxide, coded as C. XRF showed that Zn / Al (molar ratio) in C=1:9.

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Abstract

The invention discloses a catalyst for synthesizing aromatic hydrocarbon and a preparation method and application of the catalyst. The catalyst comprises a zinc-aluminate spinel oxide and an acidic molecular sieve in a mass ratio of (1:5)-(5:1), wherein the zinc-aluminate spinel oxide optionally contains at least one other element selected from chromium, zirconium, copper, manganese, indium, gallium and silicon, and the acidic molecular sieve is screened from an acidic ZSM-5 molecular sieve, an acidic ZSM-11 molecular sieve and a mixture of the acidic ZSM-5 molecular sieve and the acidic ZSM-11 molecular sieve. When the catalyst is applied to a method for directly preparing aromatic hydrocarbon by hydrogenation of carbon dioxide, aromatic hydrocarbon can be generated with high selectivityby hydrogenation of carbon dioxide, and the catalyst has good stability. According to the method disclosed by the invention, generation of aromatic hydrocarbon in one step by hydrogenation of carbon dioxide is realized, and the problem of a large amount of energy consumption caused by step-by-step production is reduced.

Description

technical field [0001] The invention relates to a catalyst for aromatic hydrocarbon synthesis, a preparation method and application thereof. Background technique [0002] Over the past two centuries, the large-scale development and utilization of petrochemical resources represented by oil, coal, and natural gas has provided human society with abundant energy and raw materials, and promoted the unprecedented prosperity and development of economy and civilization. However, it also results in a large amount of carbon dioxide emissions. As we all know, carbon dioxide is a typical greenhouse gas, and large-scale industrial emissions will pose a serious threat to the human living environment. Clean energy represented by solar energy, wind energy, tidal energy, geothermal energy, etc. has a large amount of energy and does not generate additional carbon dioxide emissions. However, due to the shortcomings of low energy density and large fluctuations, it is difficult to efficiently u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/48C10G2/00
CPCB01J29/405B01J29/48C10G2/50C10G2400/30B01J29/40C10G2/00C07C15/02C07C1/12B01J23/06
Inventor 倪友明朱文良刘中民刘勇刘红超马现刚刘世平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI