Anti-sintering nano AlFx catalyst prepared from porous material precursor containing PO4 tetrahedron, preparation method and application thereof

A porous material and catalyst technology, applied in the field of sintering-resistant nano-AlFx catalyst and its preparation, can solve problems such as catalyst deactivation, and achieve the effects of simple preparation method, high catalytic activity and stability, and improved service life

Pending Publication Date: 2022-01-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For the aluminum fluoride AlF in existing prior art 3 The above-mentioned carbon deposits and sintering phenomena that exist in the catalyst cause the problem of catalyst deactivation. The purpose of the present invention is to provide 4 Anti-sintering nano-AlF prepared from tetrahedral porous material precursor x Catalyst and its preparation method and application

Method used

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  • Anti-sintering nano AlFx catalyst prepared from porous material precursor containing PO4 tetrahedron, preparation method and application thereof
  • Anti-sintering nano AlFx catalyst prepared from porous material precursor containing PO4 tetrahedron, preparation method and application thereof
  • Anti-sintering nano AlFx catalyst prepared from porous material precursor containing PO4 tetrahedron, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Using molecular sieve APO-5 as the precursor, put 5.904g of APO-5 into the atmosphere tube furnace, and feed the gaseous fluorine source CHFCl at 300°C 2 , the gas-phase fluorine source flow rate is 10mL / min fluorination for 3h, and then wait until the gas-phase fluorination is completed, the atmosphere in the tube furnace is switched to N 2 Until the temperature is naturally lowered to room temperature, a stable nano-AlFx catalyst is obtained. The prepared nano-AlFx catalyst was characterized by XRD, and calculated by the Scherrer formula, the particle size of the nano-AlFx catalyst was 32.55nm. The obtained catalyst sample is pressed into tablets under 10-20 MPa, crushed, sieved with a 20-40 mesh sieve, and used for the following catalytic reaction.

[0022] The nano-AlFx catalyst prepared above is used to catalyze 1,1-difluoroethane (HFC-152a) cracking to prepare vinyl fluoride, and the reaction formula is as follows:

[0023]

[0024] The reaction conditions ar...

Embodiment 2

[0026] Using molecular sieve APO-18 as the precursor, put 6.03g of APO-18 into the atmosphere tube furnace, and feed the gas phase fluorine source CHF at 300°C 3 , the gas-phase fluorine source flow rate is 20mL / min fluorination for 1.5h, and then wait until the gas-phase fluorination is completed, the atmosphere in the tube furnace is switched to N 2Until the temperature is naturally lowered to room temperature, a stable nano-AlFx catalyst is obtained. The prepared nano-AlFx catalyst was characterized by XRD, and calculated by Scherrer's formula, the particle size of the nano-AlFx catalyst was 33.10nm. The obtained catalyst sample is pressed into tablets under 10-20 MPa, crushed, sieved with a 20-40 mesh sieve, and used for the following catalytic reaction.

[0027] The nano-AlFx catalyst prepared above is used to catalyze the cracking of 1,1,1,3,3-pentafluoropropane (HFC-245fa) to prepare 1,3,3,3-tetrafluoropropene (HFO-1234ze), the reaction formula as follows:

[0028] ...

Embodiment 3

[0031] Using molecular sieve SAPO-5 as the precursor, put 7.43g of SAPO-5 into the atmosphere tube furnace, and feed the gas phase fluorine source CHF at 300°C 3 , the gas-phase fluorine source flow rate is 10mL / min fluorination for 3h, and then wait until the gas-phase fluorination is completed, the atmosphere in the tube furnace is switched to N 2 Until the temperature is naturally lowered to room temperature, a stable nano-AlFx catalyst is obtained. The prepared nano-AlFx catalyst was characterized by XRD, and calculated by the Scherrer formula, the particle size of the nano-AlFx catalyst was 33.09nm. The obtained catalyst sample is pressed into tablets under 10-20 MPa, crushed, sieved with a 20-40 mesh sieve, and used for the following catalytic reaction.

[0032] The nano-AlFx catalyst prepared above is used to catalyze the cracking of 1,1-difluoroethane (HFC-152a) to prepare vinyl fluoride, and the reaction formula is as follows:

[0033]

[0034] The reaction condi...

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Abstract

The invention discloses an anti-sintering nano AlFx catalyst prepared from a porous material precursor containing a PO4 tetrahedron, a preparation method and application of the anti-sintering nano AlFx catalyst, and the preparation method of the catalyst comprises the following steps of: taking a porous material containing the PO4 tetrahedron as the precursor, and performing fluorination treatment on the porous precursor under the action of a fluorine source to obtain the nano AlFx catalyst, the fluorine source is at least one of a gas-phase fluorine source and a solid-phase fluorine source, and the solid-phase fluorine source is one of a fluorine-containing compound and a fluorine-containing polymer. The obtained nano AlFx catalyst has high catalytic activity and stability in the reaction of preparing fluorine-containing alkene by removing HF from the fluorine-containing alkane gas phase, the service life of the catalyst is prolonged, the catalyst is not prone to carbon deposition and sintering in the reaction, the target product yield is high, the fluorine-containing alkane conversion rate is high, and industrialization is easy.

Description

technical field [0001] The application belongs to the technical field of heterogeneous thermal catalysts, in particular to 4 Anti-sintering nano-AlF prepared from tetrahedral porous material precursor x Catalyst and its preparation method and application. Background technique [0002] Hydrofluorocarbons (HFCs) are a class of non-CO 2 Greenhouse gases. Fluorinated alkanes can be converted into fluorine-containing olefins (HFOs) that have less impact on the environment, and can be widely used in the fields of refrigerants, foams, and aerosols, and have high economic benefits. Therefore, converting fluorine-containing alkanes into fluorine-containing compounds such as fluorine-containing intermediates and fluorine-containing olefins with economic value can realize the effective utilization of fluorine resources. [0003] In the prior art, the reaction of fluorine-containing alkanes cracking and dehydrofluorination to prepare fluorine-containing olefins, the most commonly us...

Claims

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Application Information

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IPC IPC(8): B01J27/125B01J35/10C07C17/25C07C21/18
CPCB01J27/125C07C17/25B01J35/23B01J35/615C07C21/18
Inventor 韩文锋孙艺伟韦小丽刘兵王羽魏一凡刘力嘉黄云帆
Owner ZHEJIANG UNIV OF TECH
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