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Heteropolyacid ammonium salt catalyst and preparation method thereof

A heteropolyacid ammonium salt and catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of reducing catalyst activity, affecting product selectivity, weakening catalyst acidity, etc., to achieve Effect of reduced interaction, high selectivity, enhanced interaction

Active Publication Date: 2019-06-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this catalyst also has some problems. First, the active component heteropolyacid ammonium salt interacts with the carrier alumina during the loading process, which weakens the acidity of the catalyst and correspondingly reduces the activity of the catalyst.
Secondly, the ammonium salt of the heteropolyacid is uniformly dispersed on the catalyst, and the ammonium salt of the heteropolyacid inside the channel will cause excessive reaction of the raw material and affect the selectivity of the product.

Method used

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  • Heteropolyacid ammonium salt catalyst and preparation method thereof
  • Heteropolyacid ammonium salt catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Preparation of catalyst:

[0045] Weigh 3.8g phosphoric acid H 3 PO 4 (concentration 85 wt%) was dissolved in 100mL water, added to 85.1g alumina carrier (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm), mixed evenly and dried at 70°C for 4h, then heated to 110°C and dried for 4h to prepare catalyst precursor A; then added to 200mL containing 11.8g dodecyl In the cyclohexane solution of trimethoxysilane, react at 50°C for 3.0h, and dry at 70°C for 8h to obtain catalyst precursor B; ℃ low temperature reaction bath, then add 150mL aqueous solution containing 42.6g citric acid, soak for 30min, pour out the solution, then add 150mL ammonium carbonate solution with a mass fraction of 30% and soak for 5min, pour out the solution, then add 100mL An aqueous solution containing 10.4g of phosphotungstic acid was impregnated for 5 minutes and then filtered, and the obtained solid was dried at 110°C for 8.0h at a relativ...

Embodiment 2

[0051] (1) Preparation of catalyst:

[0052] Weigh 7.6g phosphoric acid H 3 PO 4 (concentration 85 wt%) was dissolved in 100mL water, added to 76.4g alumina carrier (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm), mixed evenly and dried at 70°C for 4h, then heated to 110°C and dried for 4h to prepare catalyst precursor A; then added to 200mL containing 21.7g hexadecyl In the cyclohexane solution of trimethoxysilane, react at 50°C for 3.0h, and dry at 70°C for 8h to obtain catalyst precursor B; then add it to 200mL0# diesel oil, filter after soaking for 30min, and place the obtained material in- In a low-temperature reaction bath at 10°C, add 150mL of an aqueous solution containing 76.4g of citric acid, soak for 30 minutes, pour out the solution, then add 150mL of ammonium carbonate solution with a mass fraction of 30%, and soak for 5 minutes, pour out the solution, and then add 100mL of an aqueous solution containing 1...

Embodiment 3

[0058] (1) Preparation of catalyst:

[0059] Weigh 11.4g phosphoric acid H 3 PO 4 (concentration 85 wt%) was dissolved in 100mL water, added to 67.3g alumina support (pore volume 0.70mL / g, specific surface area 300m 2 / g, spherical shape, particle diameter 0.4mm~0.6mm), mixed evenly and dried at 70°C for 4h, then heated to 110°C and dried for 4h to prepare catalyst precursor A; then added to 200mL containing 34.0g octadecyl In the cyclohexane solution of trimethoxysilane, react at 50°C for 3.0h, and dry at 70°C for 8h to obtain catalyst precursor B; In a low-temperature reaction bath at -20°C, add 150mL of an aqueous solution containing 80.8g of citric acid, soak for 30 minutes, pour out the solution, then add 150mL of ammonium carbonate solution with a mass fraction of 30%, soak for 5 minutes, and pour out the solution. Then add 100mL of an aqueous solution containing 20.8g of phosphotungstic acid, filter after soaking for 5min, dry the obtained solid at 110°C for 8.0h at ...

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Abstract

The invention discloses a heteropolyacid ammonium salt catalyst and a preparation method thereof, wherein the catalyst comprises an active component, an auxiliary agent and a carrier, the active component is a heteropolyacid ammonium salt, the auxiliary agent is phosphorus, and the carrier is an alumina and silica composite support. The preparation method comprises: preparing a catalyst precursor,modifying it, and finally supporting an active component. The catalyst of the invention has high reactivity and high selectivity, and is particularly suitable for the reactions for preparing ethyleneby using a low-concentration ethanol aqueous solution as a raw material.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a catalytic material and a preparation method thereof, in particular to a catalyst for ethanol dehydration to produce 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/16B01J31/18B01J27/19B01J27/188B01J23/28B01J23/30B01J37/02B01J37/08B01J35/10C07C1/24C07C11/04
CPCY02P20/52
Inventor 金浩朱慧红葛海龙孟兆会杨光孙素华杨涛
Owner CHINA PETROLEUM & CHEM CORP
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