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CHA type topological structure zinc-silicon molecular sieve catalyst with high zinc-silicon ratio as well as preparation method and application thereof

A topological structure and molecular sieve technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex feeding sequence, complex operation process, complex preparation process, and low zinc-silicon, etc., to achieve enhanced reaction performance , good technical effect, good stability effect

Pending Publication Date: 2021-01-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Chinese patent CN101293660 provides a method for preparing SAPO-34 molecular sieve by controlling the feeding sequence, but the feeding sequence and operation process involved in this method are relatively complicated
[0015] Up to now, there are only a few reports on zinc-silicon molecular sieves with high Zn-silicon ratio CHA-type topological structure, and the preparation process is relatively complicated and the Zn-silicon ratio is low.

Method used

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  • CHA type topological structure zinc-silicon molecular sieve catalyst with high zinc-silicon ratio as well as preparation method and application thereof
  • CHA type topological structure zinc-silicon molecular sieve catalyst with high zinc-silicon ratio as well as preparation method and application thereof
  • CHA type topological structure zinc-silicon molecular sieve catalyst with high zinc-silicon ratio as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take by weighing 312.36g of zinc nitrate (Zn(NO 3 ) 2 ·6H 2 (2, 1.04mol) was added to 8353.66g of distilled water, then 2219.81g of amantadine (TMADaOH, 40wt%, 14.70mol) was added and stirred evenly, then the homogeneously mixed solution was transferred to an oil bath environment at 30°C, and stirred Add 0.25% of all-silicon CHA-type seed crystals and 982.43g of amantadine (TMADaOH, 40wt%, 6.50mol) that will account for the total weight of the reactant on a dry basis. , 8.02mol) and lithium hydroxide (LiOH) which accounts for 5% of the total weight of the dry basis of the reactant is dropped into the reaction solution and the oil bath is heated up to 60°C to continue stirring, and the molar ratio of the controlled crystallization mixed solution is: nZnO / nSiO 2 / ntemplate T / nH 2 O=1: 7.71: 20.38: 587.42, after being completely mixed, the crystallized mixture was placed in a Teflon-lined pressure vessel for crystallization at 140°C for 3 days, the product was filtere...

Embodiment 2

[0045] Weigh 20.13g of zinc acetate (Zn(OAc) 2 2H 2 (O, 0.09mol) was added in 333.35g of distilled water, then added 12.98g of triethylenediamine (DABCO, ≥98wt%, 0.12mol) and 110.42g of triethylamine (TEA, 1.09mol), stirred evenly, and then Transfer the uniformly mixed solution to an oil bath environment at 60°C, add all-silicon CHA-type seed crystals accounting for 5% of the total weight of the dry basis of the reactants and 27.02% of triethylenediamine (DABCO, ≥98wt%, 0.24 mol) and 89.58g of triethylamine (TEA, 0.88mol), after closed stirring for 2.5h, 3.62g of white carbon black (SiO 2 , 99wt%, 0.06mol) and magnesium hydroxide (Mg(OH) 2 ) into the reaction liquid and heat the oil bath to 100°C to continue stirring, and control the molar ratio of the crystallization mixed liquid to be: nZnO / nSiO 2 / ntemplate T / nH 2 O = 1: 0.67: 25.89: 205.78. After being completely mixed, the crystallized mixture was placed in a polytetrafluoroethylene-lined pressure vessel and crystalli...

Embodiment 3

[0047] Weigh 1039.99g of zinc sulfate (ZnSO 4 ·6H 2 (2, 36.17mol) was added in 5335.66g of distilled water, then added 1259.84g of amantadine (TMADaOH, 98wt%, 8.32mol) and 3254.12g of di-n-propylamine (DPA, 32.16mol) and stirred uniformly, then mixed The solution was transferred to an oil bath environment at 50°C, and under stirring, 2.9% of all-silicon CHA-type seed crystals and 712.43g of TMADaOH (98wt%, 4.71mol) and 5654.52g of dinormal Propylamine (DPA, 55.88mol), after closed stirring for 5h, 21126.22g of silica sol (40wt%, 140.84mol) and lithium hydroxide (LiOH) and magnesium hydroxide (Mg (OH) 2 ) into the reaction liquid and heat the oil bath to 80°C and continue stirring to control the molar ratio of the crystallization mixed liquid: nZnO / nSiO 2 / ntemplate T / nH 2 O = 1: 3.89: 2.79: 27.66, after being completely mixed, the crystallized mixture was placed in a polytetrafluoroethylene-lined pressure vessel and crystallized at 160°C for 2.5 days. After the product was...

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Abstract

The invention relates to a CHA type topological structure zinc-silicon molecular sieve catalyst with a high zinc-silicon ratio as well as a preparation method and application thereof, and mainly solves the problems of low stability of a methanol-to-olefin catalyst, and low selectivity and low yield of ethylene and propylene, particularly propylene, in low-carbon olefin in the prior art. The technical scheme adopted by the invention comprises that the CHA type topological structure zinc-silicon molecular sieve catalyst with high zinc-silicon ratio is characterized by comprising the following components in parts by weight: a) 10-99 parts of a CHA type topological structure zinc-silicon molecular sieve with high zinc-silicon ratio, and b) 1-90 parts of a binder, the problems are well solved,and the catalyst can be used for methanol-to-olefin industrial production.

Description

technical field [0001] The invention relates to a high-zinc-silicon ratio CHA type topological structure zinc-silicon molecular sieve catalyst, a preparation method and an application thereof. Background technique [0002] Early zeolites refer to aluminosilicates, which are composed of SiO 4 Tetrahedron and AlO 4 Tetrahedron is the basic structural unit, a kind of microporous compound with cage or pore structure formed by bridge oxygen connection. According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into the following three categories according to their pore diameters: materials with a pore diameter less than 2 nm are microporous materials; materials with a pore diameter between 2 and 50 nm Materials are mesoporous materials (mesopore materials); materials with a pore diameter greater than 50nm are macropore materials (macropore materials), and zeolite molecular sieve channel diameters are generally b...

Claims

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Application Information

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IPC IPC(8): B01J29/70C07C1/20C07C11/06C07C11/04
CPCB01J29/7065C07C1/20C07C11/06C07C11/04Y02P20/52Y02P30/20Y02P30/40
Inventor 乔健刘松霖袁志庆张铁柱滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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