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Bifunctional catalyst containing hierarchical porous SAPO-34 molecular sieve as well as preparation method and application of bifunctional catalyst

A SAPO-34, bifunctional catalyst technology, applied in the field of molecular sieves, can solve the problems of high cost, complicated process, cumbersome steps, etc., and achieve the effect of low cost, simple and easy steps, and improved selectivity

Pending Publication Date: 2022-05-06
CHIA TAI ENERGY MATERIALS DALIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method involved in the above-mentioned patents has disadvantages such as complex process, cumbersome steps, and high cost.

Method used

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  • Bifunctional catalyst containing hierarchical porous SAPO-34 molecular sieve as well as preparation method and application of bifunctional catalyst
  • Bifunctional catalyst containing hierarchical porous SAPO-34 molecular sieve as well as preparation method and application of bifunctional catalyst
  • Bifunctional catalyst containing hierarchical porous SAPO-34 molecular sieve as well as preparation method and application of bifunctional catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Weigh 10.10g of pseudo-boehmite and 51.6g of deionized water and stir evenly, then slowly add 16.09g of phosphoric acid, 2.93g of silica sol, and 20.26g of triethylamine in sequence, and continue stirring until a uniform gel is formed. The obtained gel was transferred into a 150 mL stainless steel synthesis kettle with a polytetrafluoroethylene liner, heated to 200°C over 120 min, and crystallized at this temperature for 38 h. After the crystallization was completed, the synthesis kettle was taken out of the rotary oven and cooled to room temperature with flowing water, and then the crystallized product was rotated in a constant temperature 40° C. rotary oven for 20 minutes. The obtained product is subjected to centrifugal washing to neutrality, and placed in an oven at 110° C. to dry overnight to obtain the original powder of multi-order porous SAPO-34 molecular sieve. After the raw powder is calcined at 550°C in air to remove the organic template, a calcined hierarchi...

Embodiment 2

[0050] Same as Example 1, except that the reaction temperature in the reaction conditions is changed from 350°C to 375°C.

Embodiment 3

[0052] The preparation process of the catalyst was the same as in Example 1, except that the crystallized product was rotated in a rotary oven at a constant temperature of 40° C. for 40 minutes, and the obtained multi-order porous SAPO-34 molecular sieve was designated as SP34-40. The XRD results show that it is a SAPO-34 molecular sieve structure, and the scanning electron microscope results can clearly observe the formation of a butterfly-like macroporous structure. Scanning electron microscope results show that SAPO-34 molecular sieve has a hierarchical pore structure, which consists of micropores and macropores.

[0053] Preparation of bifunctional catalyst: uniformly mix SP34-40 molecular sieve (40-60 mesh) with metal oxide ZnCrAl (40-60 mesh) prepared by co-precipitation method according to the weight ratio of molecular sieve to metal oxide of 1:2.

[0054] The evaluation conditions and process of the bifunctional catalyst are the same as in Comparative Example 1.

[00...

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Abstract

The invention discloses a bifunctional catalyst containing a hierarchical pore SAPO-34 molecular sieve, the bifunctional catalyst comprises a component I and a component II, the component I is the hierarchical pore SAPO-34 molecular sieve obtained by performing post-treatment on the SAPO-34 molecular sieve with a microporous structure in an original mother solution, and the component II is a ZnCrAl metal oxide. The invention also discloses a preparation method of the bifunctional catalyst containing the hierarchical porous SAPO-34 molecular sieve. The bifunctional catalyst containing the hierarchical porous SAPO-34 molecular sieve prepared by the invention can shorten the residence time of an olefin product in a crystal in a reaction of preparing low-carbon olefin from synthesis gas and inhibit a secondary reaction of hydrogen transfer of the olefin product, so that the selectivity of the low-carbon olefin can be improved. The method provided by the invention has the advantages of simple and feasible steps, rapidness, environmental friendliness and low cost.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a bifunctional catalyst containing hierarchically porous SAPO-34 molecular sieves, a preparation method and its application in the reaction of synthesis gas to light olefins. Background technique [0002] Low-carbon olefins (mainly including ethylene, propylene, and butene) are very important chemical raw materials and are widely used in the production of plastics, pharmaceuticals, solvents, and coatings. At present, the production of light olefins still largely relies on naphtha cracking. As energy consumption increases and crude oil depletes, there is hope to develop new routes to meet tight demand for hydrocarbon fuels and chemicals, which could reduce heavy reliance on petroleum resources. Against this backdrop, there is renewed research interest in converting non-petroleum carbon resources such as coal, natural gas, biomass, and even industrial waste into the fuels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C07C1/04C07C11/04C07C11/06C07C11/08
CPCB01J29/85C07C1/043C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 魏晓娜李文双王闯刘志强陈诗通袁龙李丽尹冬雪周玖玲
Owner CHIA TAI ENERGY MATERIALS DALIAN
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