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Modified cerium-silicon catalyst, preparation method thereof, and application in 2,6-xylenol synthesis

A technology of dimethylphenol and catalyst, which is applied in the field of new catalytic systems, can solve the problems of high reaction temperature and high decomposition rate of methanol, and achieve the effect of improving the service life

Active Publication Date: 2019-02-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the selectivity of the magnesium oxide catalyst is high, the reaction temperature is also high, and the decomposition rate of methanol is high

Method used

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  • Modified cerium-silicon catalyst, preparation method thereof, and application in 2,6-xylenol synthesis
  • Modified cerium-silicon catalyst, preparation method thereof, and application in 2,6-xylenol synthesis
  • Modified cerium-silicon catalyst, preparation method thereof, and application in 2,6-xylenol synthesis

Examples

Experimental program
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Embodiment 1

[0015] Modification of embodiment 1 cerium-silicon catalyst-preparation of CeSi-Li

[0016] Weigh 0.5g of anhydrous lithium carbonate and dissolve it in 20ml of ultrapure water to obtain modified solution 1. The pretreated CeSi was impregnated into modification solution 1 for 4 h, then filtered and washed with ultrapure water. The resulting filter cake was dried at 120° C. for 8 hours and then calcined at 500° C. for 8 hours. The obtained solid was pressed into tablets for use, labeled as CeSi-Li, and used in Examples 5-10.

Embodiment 2

[0017] Modification of embodiment 2 cerium-silicon catalyst-preparation of CeSi-Na

[0018] Weigh 0.5 g of anhydrous sodium carbonate and dissolve it in 20 ml of ultrapure water to obtain modified solution 2. The pretreated CeSi was impregnated into modification solution 2 for 4 h, then filtered and washed with ultrapure water. The resulting filter cake was dried at 120° C. for 8 hours and then calcined at 500° C. for 8 hours. The resulting solid was pressed into tablets for use, marked as CeSi-Na, and used in Examples 11-16.

Embodiment 3

[0019] Modification of embodiment 3 cerium-silicon catalyst-preparation of CeSi-K

[0020] Weigh 0.5 g of anhydrous potassium carbonate and dissolve it in 20 ml of ultrapure water to obtain modified solution 3. The pretreated CeSi was impregnated into modification solution 3 for 4 h, then filtered and washed with ultrapure water. The obtained filter cake was dried at 120° C. for 8 hours and then calcined at 500° C. for 8 hours. The obtained solid was pressed into tablets for later use, marked as CeSi-K, and used in Examples 17-24 and Examples 38-48.

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Abstract

The invention relates to a novel catalytic system which takes methyl alcohol and phenol as raw materials to efficiently synthesize 2,6-xylenol under a gaseous phase condition. In the system, through afirst main group element, cerium-silicon catalyst is modified. Under the same condition, the percent conversion of the phenol is improved to 100%, the yield of the 2,6-xylenol is improved to 98% from25%, and in addition, the service life of the catalyst is prolonged to more than 3000 hours from original less than 24 hours after modification.

Description

technical field [0001] The invention relates to a novel catalytic system for efficiently synthesizing 2,6-dimethylphenol under gas-phase conditions by using methanol and phenol as raw materials, and belongs to the technical field of catalyst synthesis. Background technique [0002] 2,6-Dimethylphenol is an important organic chemical raw material and intermediate, and is a monomer for preparing polyphenylene oxide (PPO), one of the five major engineering plastics. It has important applications in pharmacy, medicine, military industry and aviation. At present, the industrial production of 2,6-dimethylphenol mainly uses phenol as the raw material and methanol as the alkylating agent to carry out the alkylation reaction through a fixed bed or a fluidized bed. In many research reports, the catalysts used can be divided into three categories: molecular sieves, hydrotalcites and metal oxides, and metal oxide catalysts can be further divided into single metal oxides and composite m...

Claims

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Application Information

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IPC IPC(8): B01J23/10C07C37/11C07C39/07
CPCB01J23/10C07C37/11C07C39/07
Inventor 黄家辉徐吉磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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