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A kind of Fe-sapo-34 molecular sieve with high skeleton iron content and preparation method thereof

A SAPO-34, fe-sapo-34 technology, applied in the field of molecular sieve preparation, can solve the problems of low heteroatom metal content and low catalytic activity, achieve high metal content, high specific surface area, increase B acid and L acid center effect

Active Publication Date: 2016-08-17
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a Fe-SAPO-34 molecular sieve with high skeleton iron content and its preparation method, which overcomes the low heteroatom metal content in the existing metal-modified SAPO-34 molecular sieve prepared and is used for MTO The problem of low catalytic activity during the reaction

Method used

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  • A kind of Fe-sapo-34 molecular sieve with high skeleton iron content and preparation method thereof
  • A kind of Fe-sapo-34 molecular sieve with high skeleton iron content and preparation method thereof
  • A kind of Fe-sapo-34 molecular sieve with high skeleton iron content and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] Add 10g of phosphoric acid and 10g of ethyl orthosilicate to 60ml of deionized water, stir for 15min, then add 11g of K 4 Fe(CN) 6 After continuing to stir for 60 minutes, 8 ml of diethylamine was added, and after 3 hours of reaction, the solution was transferred to a polytetrafluoro-lined autoclave, and crystallized under autogenous pressure of 160° C. for 72 hours. Then the sample was suction-filtered, washed with deionized water until neutral, and dried at 100°C for 6 hours. at 1°C min -1 The rate was programmed to increase the temperature to 550°C, keep the temperature for 5h, and remove the template agent.

Embodiment 2

[0030] Add 10g of phosphoric acid and 12.1g of ethyl orthosilicate to 60ml of deionized water, stir for 15min, then add 11g of K 4 Fe(CN) 6 After continuing to stir for 60 min, 10 ml of diethylamine was added, and after 3 hours of reaction, the solution was transferred to a polytetrafluoro-lined autoclave, and crystallized at an autogenous pressure of 160° C. for 72 hours. Then the sample was suction-filtered, washed with deionized water until neutral, and dried at 100°C for 6 hours. at 1°C·min -1 The rate was programmed to increase the temperature to 550°C, keep the temperature for 5h, and remove the template agent.

Embodiment 3

[0032] Add 8g of phosphoric acid and 12.1g of ethyl orthosilicate to 60ml of deionized water, stir for 15min, then add 11g of K 4 Fe(CN) 6 After continuing to stir for 60 min, 10 ml of diethylamine was added, and after 3 hours of reaction, the solution was transferred to a polytetrafluoro-lined autoclave, and crystallized under autogenous pressure of 180° C. for 72 hours. Then the sample was suction-filtered, washed with deionized water until neutral, and dried at 100°C for 6 hours. at 1°C·min -1 The temperature was programmed to 550°C, and the temperature was kept for 5 hours to remove the templating agent.

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Abstract

The invention provides a Fe-SAPO-34 molecular sieve with high skeleton ion content and a preparation method thereof, overcoming the problems that the prepared metal-modified SAPO-34 molecular sieve reported in literature is low in skeleton metal content and low in catalytic activity when being applied to reaction for preparing olefin by employing methanol. The invention provides a synthetic method of the Fe-SAPO-34 molecular sieve with high skeleton ion content. The method has the characteristics that the prepared SAPO-34 molecular sieve is high in skeleton ion atom content and good in catalytic activity, and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to a preparation method of molecular sieves, in particular to a Fe-SAPO-34 molecular sieve with high skeleton iron content and a preparation method thereof. Background technique [0002] SAPO-34 molecular sieve is a member of the SAPO-n series of molecular sieves first synthesized by UCC in 1982. It has a chabazite-like structure, has moderate acidity and good thermal and hydrothermal stability. The reaction to prepare light olefins has attracted much attention due to its excellent catalytic performance. It has a CHA structure and moderate acidity, and has been valued for its excellent catalytic performance in methanol-to-olefins (MTO) technology. CHA contains an 8-membered ring orifice to form an ellipsoidal cage and a three-dimensional channel structure. The catalytic performance of SAPO molecular sieves has a great relationship with its structure. In order to expand the applicable performance of SAPO molecular sieves, modifyi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54B01J29/85
Inventor 徐俊青陈涛
Owner CHINA TIANCHEN ENG
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