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Preparation method of a phosphoric acid modified microporous molecular sieve shape-selective catalyst

A microporous molecular sieve and catalyst technology, which is applied in the field of preparation of phosphoric acid modified microporous molecular sieve shape-selective catalysts, can solve the problems of cumbersome preparation operations and high cost of shape-selective catalysts, and achieves increased effective coverage, low preparation cost, and reduced waste. The effect of coverage

Inactive Publication Date: 2015-04-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a kind of selective catalyst with simple synthesis method, low cost and high shape-selective performance aiming at the problems of cumbersome preparation and high cost of shape-selective catalyst in the process of synthesizing p-diethylbenzene from ethylphenylethanol. Form catalyst preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add phosphoric acid crystals to absolute ethanol, stir until mixed evenly; then add microporous molecular sieve ZSM-5 to the above solution, stir evenly, and let stand at room temperature; wherein the mass ratio of microporous molecular sieve ZSM-5 to absolute ethanol is 1:2, the mass ratio of microporous molecular sieve ZSM-5 to phosphoric acid is 100:7; the material obtained in the above steps is evaporated to dryness in a water bath, then put into an oven to dry, and then transferred to a muffle furnace, in an air atmosphere The temperature was raised to 500° C., and then lowered to room temperature to obtain the desired phosphoric acid-modified microporous molecular sieve shape-selective catalyst, which was designated as CAT-1.

Embodiment 2

[0017] Add phosphoric acid crystals to absolute ethanol, stir until mixed evenly; then add microporous molecular sieve ZSM-5 to the above solution, stir evenly, and let stand at room temperature; wherein the mass ratio of microporous molecular sieve ZSM-5 to absolute ethanol is The mass ratio of 1:2 microporous molecular sieve ZSM-5 to phosphoric acid is 100:15; the material obtained in the above steps is evaporated to dryness in a water bath, then put into an oven to dry, and then transferred to a muffle furnace, in an air atmosphere Raise the temperature to 500° C., and then lower it to room temperature to obtain the desired phosphoric acid-modified microporous molecular sieve shape-selective catalyst, which is denoted as CAT-2.

Embodiment 3

[0019] Add phosphoric acid crystals to absolute ethanol, stir until mixed evenly; then add microporous molecular sieve ZSM-5 to the above solution, stir evenly, and let stand at room temperature; wherein the mass ratio of microporous molecular sieve ZSM-5 to absolute ethanol is The mass ratio of 1:4 microporous molecular sieve ZSM-5 to phosphoric acid is 100:7; the material obtained in the above steps is evaporated to dryness in a water bath, then put into an oven to dry, and then transferred to a muffle furnace, in an air atmosphere Raise the temperature to 600° C., and then lower it to room temperature to obtain the desired phosphoric acid-modified microporous molecular sieve shape-selective catalyst, which is denoted as CAT-3.

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Abstract

The invention relates to a preparation method of a phosphoric acid modified microporous molecular sieve shape-selective catalyst. The method uses a microporous molecular sieve ZSM-5 or MCM-22 as a matrix, phosphoric acid as a precursor and ethanol as a solvent, and employs an impregnating method to load phosphorus oxide on the microporous molecular sieve, wherein the content of phosphorus oxide in the catalyst accounts for 5%-10% of the total weight of the catalyst. The shape-selective catalyst obtained by the invention has good shape-selective catalysis performance on the synthesis of p-diethyl benzene by styralyl alcohol alkylation.

Description

technical field [0001] The invention relates to the field of preparation of solid inorganic composite materials, in particular to a method for preparing a phosphoric acid-modified microporous molecular sieve shape-selective catalyst used in the process of alkylating ethylphenylethanol to synthesize p-diethylbenzene. Background technique [0002] The alkylation of ethylphenylethanol to p-diethylbenzene is a typical shape-selective catalytic process. Microporous molecular sieves such as ZSM-5 and MCM-22 are commonly used shape-selective catalysts for this process. However, since there are a large number of acid sites on the outer surface of these microporous molecular sieves, the p-diethylbenzene generated in the pores of the molecular sieve during the alkylation of ethylbenzene is easily isomerized on the acidic sites on the outer surface of the molecular sieve. Thereby reducing the selectivity of the para-product. In order to obtain p-diethylbenzene with high selectivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J29/40C07C15/02C07C2/86
Inventor 李永昕朱星兴柳娜薛冰许杰
Owner CHANGZHOU UNIV
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