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Heteropoly acid catalyst and preparation method thereof

A technology of catalyst and heteropolyacid, which is applied in the field of supported heteropolyacid catalyst and its preparation, can solve the problems of high reaction temperature requirements, achieve high anti-coking performance, increase total acid content, high activity and selectivity Effect

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using ethanol aqueous solution with a concentration of 5-100% as raw material, the catalyst exhibits high ethanol conversion and ethylene selectivity, but the reaction temperature is relatively high, and the activity of the catalyst needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of carrier:

[0022] Add 2.9g of citric acid and 3.0g of polyethylene glycol 200 into deionized water to form a mixed solution, then add 33.2mL of tetraethyl orthosilicate, stir well, and then add to the prepared 79.2g of In spherical alumina, stir at 60°C for 2h, then stir at 80°C until gelling, age at 40°C for 8h, then dry at 110°C for 8h, and bake at 550°C for 3h to obtain silica-coated Alumina carrier, wherein silicon oxide accounts for 10% of carrier weight, the molar ratio of citric acid and silicon oxide is 0.1, and the molar ratio of polyethylene glycol 200 and silicon oxide is 0.1.

[0023] (2) Preparation of catalyst: The catalyst is prepared by supersaturated impregnation method, and the steps are as follows:

[0024] Add 7.1g of boric acid and 8.3g of phosphotungstic acid into deionized water to prepare a mixed solution; add the prepared carrier to the mixed solution, stir at 60°C until the solution is evaporated to dryness; then place the o...

Embodiment 2

[0030] (1) Preparation of carrier:

[0031] Add 4.8g of citric acid and 15.0g of polyethylene glycol 600 into deionized water to form a mixed solution, then add 37.8mL of tetraethyl orthosilicate, stir well, and then add to the prepared 73.0g of In spherical alumina, stir at 60°C for 2 hours, then stir at 80°C until gelling, age at 40°C for 8 hours, then dry at 110°C for 8 hours, and bake at 550°C for 3 hours to obtain silica coating The alumina carrier, wherein silica accounts for 12% of the weight of the carrier, the molar ratio of citric acid to silica is 0.15, and the molar ratio of polyethylene glycol 600 to silica is 0.15.

[0032] (2) Preparation of catalyst: The catalyst is prepared by supersaturated impregnation method, and the steps are as follows:

[0033] Add 8.9g of boric acid and 12.5g of phosphotungstic acid into deionized water to prepare a mixed solution; add the prepared carrier to the mixed solution, stir at 60°C until the solution is evaporated to dryness;...

Embodiment 3

[0037] (1) Preparation of carrier:

[0038] Add 7.6g of citric acid and 14.3g of polyethylene glycol 400 into deionized water to make a mixed solution, then add 44.9mL of tetraethyl orthosilicate, stir well, and then add to the prepared 67.2g of In spherical alumina, stir at 60°C for 2h, then stir at 80°C until gelling, age at 40°C for 8h, then dry at 110°C for 8h, and bake at 550°C for 3h to obtain silica-coated Alumina carrier, wherein silicon oxide accounts for 15% of carrier weight, the molar ratio of citric acid and silicon oxide is 0.2, and the molar ratio of polyethylene glycol 400 and silicon oxide is 0.18.

[0039] (2) Preparation of catalyst: The catalyst is prepared by supersaturated impregnation method, and the steps are as follows:

[0040] 10.6g of boric acid and 15.6g of phosphotungstic acid were added to deionized water to prepare a mixed solution; the prepared carrier was added to the mixed solution, at 60 o C under stirring until the solution was evaporated...

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PUM

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Abstract

The invention discloses a heteropoly acid catalyst and a preparation method thereof. The catalyst adopts alumina as the carrier, uses heteropoly acid as the active component, and takes boron oxide as the assistant, wherein the surface of the alumina carrier is coated with silica. The preparation method consists of: coating the surface of the alumina carrier with an appropriate amount of silica, and then loading heteropoly acid and the assistant component. The catalyst has high activity and selectivity when used for preparation of ethylene by ethanol dehydration.

Description

technical field [0001] The invention relates to a heteropolyacid catalyst and a preparation method thereof, in particular to a supported heteropolyacid catalyst for ethanol dehydration to ethylene and a preparation method thereof. Background technique [0002] Ethylene is a basic organic chemical raw material and a leading product in the petrochemical industry. About 75% of chemical products are prepared from ethylene. Therefore, ethylene production has become an important indicator to measure the development level of a country's petrochemical industry. Traditional ethylene is mainly produced through the distillation and cracking of light petroleum, which relies heavily on petroleum resources. With the increasingly tense international energy situation and the depletion of oil resources, it is imperative to develop new renewable alternative energy sources. [0003] Recently, the dehydration of ethanol, especially renewable bioethanol, to ethylene has attracted more and more ...

Claims

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Application Information

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IPC IPC(8): B01J31/26C07C11/04C07C1/24
CPCY02P20/52
Inventor 金浩孙素华朱慧红刘杰杨光蒋立敬
Owner CHINA PETROLEUM & CHEM CORP
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