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A copper-based bimetallic catalyst efficiently catalyzes the method for the conversion of 3-cyclohexene formaldehyde to prepare toluene

A cyclohexene formaldehyde, copper-based bimetal technology, applied in the field of catalysis, can solve the problems of long process route and high energy consumption, and achieve the effects of simple process, high selectivity and low price

Active Publication Date: 2022-03-01
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

In addition, the co-production process of aromatics requires hydrogenation, reforming, aromatics conversion, separation and other steps to obtain xylene under the conditions of catalyst and high temperature and high pressure. of great significance

Method used

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  • A copper-based bimetallic catalyst efficiently catalyzes the method for the conversion of 3-cyclohexene formaldehyde to prepare toluene
  • A copper-based bimetallic catalyst efficiently catalyzes the method for the conversion of 3-cyclohexene formaldehyde to prepare toluene
  • A copper-based bimetallic catalyst efficiently catalyzes the method for the conversion of 3-cyclohexene formaldehyde to prepare toluene

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Experimental program
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Effect test

Embodiment 1

[0029] Preparation of bimetallic supported catalyst: with 1%Pd1%Cu / Al2 o 3 As an example, 4.95g of alumina was first impregnated in 5g of PdCl 2 with Cu(NO 3 ) 2 In the solution, stir evenly and let stand for 12h, then dry at 80°C for 12h, dry at 120°C overnight, calcine in air at 500°C for 4h, reduce in hydrogen atmosphere at 300°C for 1h, and control the hydrogen flow rate to 120ml / min. Reduce to room temperature after reduction, use O2 / N 2 Mixed gas (O 2 Passivation in 5% by volume) for 4h to obtain bimetallic 1%Pd1%Cu / Al 2 o 3 catalyst.

Embodiment 2

[0031] 1%Ni1%Cu / Al 2 o 3 Preparation: 4.95g alumina was first impregnated in 5g Ni(NO 3 ) 2 with Cu(NO 3 ) 2 In the solution, stir evenly and let stand for 12 hours, then dry at 80°C for 12 hours, dry at 120°C overnight, calcine at 500°C in air for 4 hours, reduce in hydrogen atmosphere at 550°C for 1 hour, and control the hydrogen flow rate to 120ml / min. Reduce to room temperature after reduction, use O2 / N 2 Mixed gas (O 2 Passivation in 5% by volume) for 4h to obtain bimetallic 1%Ni1%Cu / Al 2 o 3 catalyst.

Embodiment 3-6

[0033] Change Cu(NO in embodiment 1 3 ) 2 The addition amount, other steps are with embodiment 1, prepare respectively and obtain 1%Pd3%Cu / Al 2 o 3 , 1%Pd5%Cu / Al 2 o 3 , 1%Pd7%Cu / Al 2 o 3 , 1%Pd10%Cu / Al 2 o 3 .

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Abstract

The invention provides a method for efficiently catalyzing the conversion of 3-cyclohexene formaldehyde to prepare toluene by a copper-based bimetallic catalyst. Under the action of supported copper-based bimetallic catalyst, 3-cyclohexene formaldehyde undergoes dehydroaromatization and hydrodeoxygenation reactions at 100°C-300°C to efficiently generate toluene. The catalytic reaction of 3-cyclohexene formaldehyde is carried out in a fixed-bed reactor, using n-octane as a solvent, and the 3-cyclohexene formaldehyde solution is injected into the reaction tube by a high-pressure flow pump or passes through the catalyst bed under the purging of hydrogen gas layer to obtain toluene. The process has a simple reaction process and high selectivity of the target product. The substrate can be obtained from 1,3-butadiene and acrolein derived from biomass resources in one step. It provides a new method for directly preparing aromatic chemicals from biomass. .

Description

technical field [0001] The invention belongs to the field of catalysis, and in particular relates to a method for preparing toluene with high selectivity by using 3-cyclohexene formaldehyde as a raw material under the action of a copper-based bimetallic catalyst. Background technique [0002] Aromatic hydrocarbons refer to compounds containing benzene rings and containing only hydrocarbons. They are important organic chemical basic raw materials and are widely used in the fields of resins, cellulose monomers, medicines, explosives, fuels, coatings and fine chemicals. Toluene is an important chemical intermediate, toluene oxide, benzoic acid and its sodium salt can be used as a bacteriostatic agent for latex, toothpaste, jam or other foods, as well as a mordant for dyeing and printing, and an intermediate for pharmaceuticals and dyes , antirust agent for iron and steel equipment, used to prepare plasticizers and spices, etc. Toluene can also generate p-xylene through alkylat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/207C07C15/06B01J23/89B01J23/755
CPCC07C1/2076B01J23/8926B01J23/755C07C2523/755C07C2523/89C07C15/06Y02P20/52
Inventor 李昌志肖钰雪孟庆伟张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI