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A kind of catalyst for aromatic hydrocarbon synthesis and its preparation method and application

A catalyst and a technology for aromatic hydrocarbons, which are applied to catalysts for aromatic hydrocarbon synthesis and the fields of their preparation and application, can solve the problems of undiscovered aromatic hydrocarbons, difficult to prepare, restricting large-scale industrial application, etc., and achieve the problem of reducing energy consumption, high utilization efficiency, The effect of suppressing the reverse water gas shift reaction

Active Publication Date: 2022-05-27
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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  • A kind of catalyst for aromatic hydrocarbon synthesis and its preparation method and application
  • A kind of catalyst for aromatic hydrocarbon synthesis and its preparation method and application
  • A kind of catalyst for aromatic hydrocarbon synthesis and its preparation method and application

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 200 ml of deionized water to prepare a saline solution. Dissolve 25 g of ammonium carbonate in 200 ml of deionized water to prepare an alkaline solution. The salt solution and the alkali solution were mixed and co-precipitated with two peristaltic pumps in parallel. The temperature of the precipitation reaction was controlled at 60 °C, the pH value was 7.2, and aged at this temperature for 4 hours. After filtering and washing, it was dried at 100 °C for 24 hours and 500 °C. After calcination for 4h, zinc-aluminum spinel oxide was obtained, numbered as A. X-ray fluorescence spectrometry (XRF) showed that Zn / Al (molar ratio) in A = 1:1, and the XRD pattern is as follows figure 1 As shown, the TEM image is as 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 200 ml of deionized water to prepare a saline solution. 25g ammonia water (containing 25% NH) 3 ) dissolved in 200ml of deionized water to prepare an alkaline solution. The salt solution and the alkali solution were mixed and co-precipitated with two peristaltic pumps in parallel. The temperature of the precipitation reaction was controlled at 70 °C, the pH value was 7.5, and aged at this temperature for 6 hours. After filtering and washing, it was dried at 100 °C for 24 hours and 500 °C. After calcination for 4h, zinc-aluminum spinel oxide was obtained, numbered B. XRF showed Zn / Al (molar ratio) = 1:2 in B.

Embodiment 3

[0066] 10.6g Zn(NO 3 ) 2 6H 2 O and 80gAl (NO 3 ) 3 9H 2 O was dissolved in 200 ml of deionized water to prepare a saline solution. Dissolve 25g of sodium carbonate in 200ml of deionized water to prepare an alkaline solution. The salt solution and the alkali solution were mixed and co-precipitated with two peristaltic pumps in parallel. The temperature of the precipitation reaction was controlled at 80 °C, the pH value was 7.8, and aged at this temperature for 6 hours. After filtering and washing, it was dried at 100 °C for 24 hours and 500 °C. After calcination for 6h, zinc-aluminum spinel oxide was obtained, numbered C. XRF showed Zn / Al (molar ratio) = 1:9 in C.

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Abstract

The invention discloses a catalyst for aromatic hydrocarbon synthesis, a preparation method and application thereof. The catalyst comprises a zinc-aluminum spinel oxide and an acidic molecular sieve at a mass ratio of 1:5 to 5:1, wherein the zinc-aluminum spinel oxide optionally contains chromium, zirconium, copper, manganese, At least one other element of indium, gallium and silicon, and the acidic molecular sieve is selected from acidic ZSM-5 molecular sieves, acidic ZSM-11 molecular sieves and mixtures thereof. When the catalyst is applied to the method for directly producing aromatics by hydrogenation of carbon dioxide, it can make the hydrogenation of carbon dioxide highly selective to generate aromatics, and the catalyst has good stability. The method of the invention realizes the hydrogenation of carbon dioxide to generate aromatics in one step, and reduces the problem of a large amount of energy consumption caused by step-by-step production.

Description

technical field [0001] The present invention relates to a catalyst for aromatic hydrocarbon synthesis and its preparation method and application. Background technique [0002] In the past two centuries, the large-scale development and utilization of petrochemical resources represented by petroleum, coal and natural gas have 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 effect 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 high volatility, it is difficult to...

Claims

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Application Information

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Patent Type & Authority Patents(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