Catalyst and preparation method and application thereof

A catalyst and production method technology, applied in molecular sieve catalysts, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of reducing dehydration activity and selectivity, reducing selectivity of conversion rate, prolonging residence time, etc. performance, avoid secondary side reactions, and prolong service life

Active Publication Date: 2020-12-01
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the branched molecular size of the anthraquinone compound precursor, the conversion rate of the dehydration precursor and the selectivity of the anthraquinone series products all decreased, confirming that in the dehydration reaction, with the increase of the molecular size, the molecules in the zeolite molecular sieve The diffusion resistance in the channel increases, and the residence time of the reactant molecules in the channel increases, resulting in the side reaction of transalkylation, thereby reducing the activity and selectivity of dehydration of larger molecules
In addition, during the dehydration reaction, the microporous channels of zeolite zeolite are easily blocked by intermolecular dehydration by-products, which eventually leads to rapid deactivation of the catalyst.

Method used

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  • Catalyst and preparation method and application thereof
  • Catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] The micron Hβ molecular sieve powder is fully mixed with citric acid and 5% of citric acid and 5% of polyacrylonitrile-based activated carbon fibers with a fiber length of 3 mm and a diameter of 10 microns, which account for the mass percentage of the wet plastomer after kneading. After kneading, the wet plastomer mass percentage of 35% aluminum sol (aluminum hydroxide mass percentage of 30%) is fully stirred and kneaded to obtain a plastic molded body; with an all-stainless steel kneading extruder, it is extruded through an orifice plate of Φ1.5mm. The wet elongated solid cylinder was dried in an oven at 40°C for 10h, then in an air atmosphere, at a heating rate of 2°C / min to 550°C, and calcined at 550°C for 12h to obtain a cylindrical bar-shaped catalyst sample C, Mesopore and macropore volume in total pore volume increased by 14.6% compared to sample A.

[0157] Wherein, the source of the micron Hβ molecular sieve powder described in this example refers to Comparativ...

Embodiment 2

[0159] Example 1 was repeated, but the micron Hβ molecular sieve powder was replaced with nano Hβ molecular sieve powder to obtain a shaped catalyst sample D, whose mesopore and macropore volume in the total pore volume increased by 18.5% compared with that of sample B.

[0160] Wherein, the source of the nano Hβ molecular sieve powder described in this example refers to Comparative Example 2.

Embodiment 3

[0162] Repeat Example 1, change the addition amount of polyacrylonitrile-based activated carbon fibers, and change the mass percentage of polyacrylonitrile-based activated carbon fibers in the wet plastomer after kneading to 1%, 2%, 15% and 20%, and obtain samples in turn For E, F, G and H, the mesopore and macropore volumes in the total pore volume increased by 8.1%, 24.5%, 27.6% and 29.3%, respectively, compared with sample A.

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Abstract

The invention discloses a catalyst and a preparation method and application thereof. The catalyst comprises a beta molecular sieve, the catalyst comprises a through-pore channel. The catalyst is provided with a through diffusion pore channel and can be repeatedly utilized; the pore diameter in the range can generate a shape selection effect on the reaction so that the reaction selectivity is improved. Meanwhile, the preparation method of the catalyst is simple.

Description

technical field [0001] The present application relates to a catalyst, a preparation method and application thereof, and belongs to the field of fine organic chemical catalysts. Background technique [0002] Anthraquinone series compounds are important fine chemical raw materials, mainly used as carriers for the synthesis of hydrogen peroxide, and can also be used in the preparation of photosensitive compounds, modified electrodes, dyes, degradable resins, pharmaceutical intermediates and other fields. In recent years, with the increasing demand for hydrogen peroxide, 2-ethylanthraquinone and 2-pentylanthraquinone have become fine chemicals with considerable development potential. [0003] At present, the preparation methods of anthraquinone mainly include: (1) Phthalic anhydride method, which is a condensation of phthalic anhydride (PhA) and benzene into o-benzoylbenzoic acid (OBB acid) in the presence of aluminum trichloride. ), o-benzoylbenzoic acid is dehydrated with con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70C07C46/00C07C50/18C07C50/16
CPCB01J29/7007C07C46/00C07C50/18C07C50/16Y02P20/584
Inventor 刘家旭郭洪臣王桂茹
Owner DALIAN UNIV OF TECH
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