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 deactivat

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
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Taking the molecular sieve APO-5 as a precursor, 5.904 g of APO-5 is placed in an atmosphere tube furnace, and the gas phase fluorine source CHFCl is in 300 ° C. 2 The gas phase fluorine source flow rate is 10 ml / min fluorinated 3h, and then the gas phase fluorination is completed, and the atmosphere in the tube furnace is switched to N. 2 It is until naturally cooling to room temperature, that is, a stable nano-ALFX catalyst is obtained. The obtained nano Alfx catalyst was characterized by XRD, and the nano-ALFX catalyst was 32.55 nm via Xiele formula. The resulting catalyst sample was pressed under 10-20 MPa, crushed, sieved with 20 to 40 sieve sieves, for use in the following catalytic reaction.

[0022] The above-mentioned nano ALFX catalyst was used to catalyze 1,1-difluoroethane (HFC-152A) cleavage preparation fluoride, the reaction formula is as follows:

[0023]

[0024] The reaction conditions are: catalyst filled in the fixed bed reactor, ca...

Example Embodiment

[0025] Example 2

[0026] Taking the molecular sieve APO-18 as a precursor, 6.03 g of APO-18 is placed in an atmosphere tube furnace, and the gas phase fluorine source is in 300 ° C. 3 The gas phase fluorine source flow rate is 20 ml / min fluorination 1.5 h, and then the gas phase fluorination is completed, and the atmosphere in the tube furnace is switched to N. 2Until natural cooling to room temperature to obtain stable nano catalyst AlFx. The prepared catalysts were characterized by XRD nano AlFx, and by the Scherrer formula, the particle size of the nano catalyst AlFx 33.10nm. The resulting catalyst sample in 10-20MPa under compression, crushing, with the purpose of 20 to 40 minutes after the sieve-like, used in the next catalytic reaction.

[0027] The above prepared catalyst AlFx nano for catalytic 1,1,1,3,3-pentafluoropropane (HFC-245fa) was prepared by cleaving 1,3,3,3-tetrafluoropropene (HFO-1234ze), the reaction of formula as follows:

[0028]

[0029] Reaction condit...

Example Embodiment

[0030] Example 3

[0031] Molecular sieve SAPO-5 as the precursor of the SAPO-5 7.43g tubular furnace into an atmosphere, at 300 deg.] C into the fluorine source gas CHF 3 , A fluorine source gas flow rate of 10mL / min fluorinated 3h, and then wait until the end of the gas-phase fluorination, the switching tube furnace atmosphere of N 2 Until natural cooling to room temperature to obtain stable nano catalyst AlFx. The prepared catalysts were characterized by XRD nano AlFx, and by the Scherrer formula, the particle size of the nano catalyst AlFx 33.09nm. The resulting catalyst sample in 10-20MPa under compression, crushing, with the purpose of 20 to 40 minutes after the sieve-like, used in the next catalytic reaction.

[0032] The above prepared catalyst AlFx nano for catalytic 1,1-difluoroethane (HFC-152a) was prepared by cleaving fluoride, the following reaction formula:

[0033]

[0034] Reaction conditions: catalyst loaded into a fixed bed reactor, catalyst loading 1mL, into...

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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
CPCB01J27/125B01J35/0013B01J35/1019C07C17/25C07C21/18
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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