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Straight channel mesoporous-sapo-34 molecular sieve and preparation method thereof

A-SAPO-34, mesoporous molecular sieve technology, applied in the field of straight-through-channel mesoporous-SAPO-34 molecular sieve and its preparation, can solve the problems of low crystallinity, high cost, poor straightness, etc., and achieve cost reduction and good technical effect Effect

Active Publication Date: 2020-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problems of high cost, low crystallinity and poor straight-through property of the obtained mesoporous SAPO-34 molecular sieve in the prior art, and a new straight-through mesoporous SAPO-34 molecular sieve is provided

Method used

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  • Straight channel mesoporous-sapo-34 molecular sieve and preparation method thereof
  • Straight channel mesoporous-sapo-34 molecular sieve and preparation method thereof
  • Straight channel mesoporous-sapo-34 molecular sieve and preparation method thereof

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Effect test

Embodiment 1

[0032] The preparation of straight-through mesoporous SAPO-34 molecular sieve is carried out as follows: first prepare SAPO-34 water-in-oil microemulsion, the aqueous solution of triethylamine (TEA) and phosphoric acid, trin-octylamine is the microemulsion aqueous phase, orthosilicic acid The toluene solution of ethyl ester (TEOS) and aluminum isopropoxide is the oil phase, and the clear microemulsion I is obtained by mixing the two phases of water and oil. The molar ratio of Si:Al:TEA in microemulsion I is 1:1:3; the molar ratio of toluene to tri-n-octylamine to water is 2:1:1; Precursor II was obtained by impregnating SBA-15 molecular sieves with a channel diameter of 4-8 nanometers at a mass ratio of 0.5:1. After aging at 60°C for 1 hour, the precursor II was loaded into a stainless steel reactor, and crystallized at 180°C for 48 hours to obtain a mesoporous SAPO-34 molecular sieve containing a template. After the product was taken out, it was calcined at 550°C for 6 hours...

Embodiment 2

[0034] The preparation of straight-through mesoporous SAPO-34 molecular sieve is carried out as follows: first prepare SAPO-34 water-in-oil microemulsion, the aqueous solution of triethylamine (TEA) and phosphoric acid, trin-octylamine is the microemulsion aqueous phase, orthosilicic acid The toluene solution of ethyl ester (TEOS) and aluminum isopropoxide is the oil phase, and the clear microemulsion I is obtained by mixing the two phases of water and oil. The molar ratio of Si:Al:TEA in microemulsion I is 1:1:3; the molar ratio of toluene to tri-n-octylamine to water is 2:1:1; Precursor II was obtained by impregnating hexagonal MCM-41 with a channel diameter of 2-6 nanometers at a mass ratio of 0.5:1. After aging at 60°C for 1 hour, the precursor II was loaded into a stainless steel reactor, and crystallized at 180°C for 48 hours to obtain a mesoporous SAPO-34 molecular sieve containing a template. After the product was taken out, it was calcined at 550°C for 6 hours to obt...

Embodiment 3

[0036] The preparation of straight-through mesoporous SAPO-34 molecular sieve is carried out as follows: first prepare SAPO-34 water-in-oil microemulsion, the aqueous solution of triethylamine (TEA) and phosphoric acid, trin-octylamine is the microemulsion aqueous phase, orthosilicic acid The toluene solution of ethyl ester (TEOS) and aluminum isopropoxide is the oil phase, and the clear microemulsion I is obtained by mixing the two phases of water and oil. The molar ratio of Si:Al:TEA in microemulsion I is 1:1:3; the molar ratio of toluene to trin-octylamine to water is 2:1:1; The precursor II is obtained by impregnating the pore molecular sieve at a mass ratio of 0.5:1, wherein the mesoporous molecular sieve is a cubic MCM-48 molecular sieve with a pore diameter of 2-4 nanometers. After aging at 60°C for 1 hour, the precursor II was loaded into a stainless steel reactor, and crystallized at 180°C for 48 hours to obtain a mesoporous SAPO-34 molecular sieve containing a template...

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Abstract

The invention relates to a through-channel mesopore-SAPO-34 molecular sieve and a preparation method thereof, and mainly solves the problems that when the prior art is used to prepare a mesopore-SAPO-34 molecular sieve, the micropore-mesopore channels cannot be fully through, and the mesopore channels collapse easily and the like. According to the invention, through the adoption of a secondary treatment method, a micro-emulsion rich in silicon / aluminum / phosphorus / SAPO-34 template / structure-directing agent is impregnated in a mesoporous molecular sieve; the pH value is adjusted to be proper; ata certain temperature, a SAPO-34 molecular sieve is epitaxially grown on the inner surface of the mesoporous molecular sieve through secondary crystallization; and then the through-type mesoporous SAPO-34 molecular sieve is generated. The method can be used in the industrial production of preparing various through mesoporous molecular sieves.

Description

technical field [0001] The invention relates to a through-channel mesoporous-SAPO-34 molecular sieve and a preparation method thereof. Background technique [0002] SAPO-34 molecular sieve belongs to the series of microporous molecular sieves and belongs to the chabazite class. Its skeleton is mainly composed of silicon aluminum phosphorus oxide, and has a CHA cage composed of double six-membered rings, eight-membered rings and four-membered rings and a three-dimensional cross channel structure. SAPO-34 has high selectivity, high hydrothermal stability, suitable acidity, and exhibits excellent catalytic performance in MTO reaction. SAPO-34 molecular sieve was first developed by United Carbide Corporation (UCC) in 1984, using triethylamine as a structure-directing agent and prepared by crystallization at 100-180°C for 6h-10 days. The active centers of microporous molecular sieves are mostly inside the pores. The longer main channel of molecular sieve will increase the diffu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54
CPCC01B39/54C01P2002/72C01P2004/04C01P2006/12
Inventor 袁晓红叶迎春唐康健许中强
Owner CHINA PETROLEUM & CHEM CORP
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