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Hierarchical porous structure SAPO molecular sieve material and preparation method thereof

A technology of multi-stage pores and molecular sieves, which is applied in the direction of molecular sieve catalysts, molecular sieves and alkali-exchanged phosphates, molecular sieve characteristic silicoaluminophosphates, etc., can solve the problems of poor diffusion performance of SAPO molecular sieves, and achieve easy control, high crystallinity, and preparation The effect of simple process

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the poor diffusion performance of existing SAPO molecular sieves

Method used

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  • Hierarchical porous structure SAPO molecular sieve material and preparation method thereof
  • Hierarchical porous structure SAPO molecular sieve material and preparation method thereof
  • Hierarchical porous structure SAPO molecular sieve material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 2.4 grams of PEG (polyethylene glycol) and 45 grams of deionized water evenly, then add 12.3 grams of aluminum isopropoxide and 11.97 grams of orthophosphoric acid (85% by weight) to it in turn, and form solution a after fully stirring; 60 grams of four Ethyl ammonium hydroxide (25% by weight) and 6 grams of silica sol (40% by weight) were mixed uniformly to form solution b; a and b were mixed and stirred at room temperature for 6 hours to obtain the crystallization liquid of synthetic SAPO-34 molecular sieve; The prepared crystallization solution was stirred and aged at room temperature for 24 h, and the aged crystallization solution was put into a crystallization kettle lined with polytetrafluoroethylene, and crystallized at 200 °C for 24 hours;

[0027] The weight ratio of each component is: R1 / Al2O3=0.4; R2 / Al2O3=10; H2O / Al2O3=7; SiO2 / Al2O3=0.4; P2O5 / Al2O3=1.1, wherein R1, R2 represent PEG (polyethylene glycol ) and TEAOH (tetraethylammonium hydroxide).

[0028...

Embodiment 2～14

[0031] According to the various steps and conditions of [Example 1], a molecular sieve with a multi-level pore structure was produced, only the parameters such as the ratio of raw materials (Table 1), the type of alkali, and the alkali treatment temperature were changed, which are specifically listed in Table 1. The characterization of the synthesized product shows that it has a crystal structure similar to that of [Example 1] and the product, and its specific physical and chemical parameters are shown in Table 2.

[0032]

[0033] Table 1

[0034]

[0035] Table 2

[0036]

Embodiment 15

[0038] A fixed-bed catalytic reaction device is adopted, and the reactor is a stainless steel tube. The catalyst prepared in Example 1 and the cubic catalyst prepared by the traditional method are evaluated for the reaction activity of methanol conversion to light olefins. The process conditions used for the investigation are: catalyst loading 0.5 g, the reaction temperature is 450°C, the reaction pressure is 0.1MPa, the water / raw material weight ratio is 0.25, and the gravimetric space velocity is 1 h -1 . Online analysis of all products. The evaluation results are shown in Table 3.

[0039]

[0040] table 3

[0041]

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Abstract

The invention relates to a preparation method of a hierarchical porous structure silicon-phosphorus-aluminum SAPO molecular sieve. The technical scheme adopted by the invention for mainly solving the problem that the hierarchical porous structure SAPO molecular sieve is hard to prepare in the prior art is as follows: the preparation method of the hierarchical porous structure silicon-phosphorus-aluminum SAPO molecular sieve comprises the following steps: hydrolyzing a mixture prepared by a high-molecular polymer R1, water, an organic template agent R2, a phosphorus source, an aluminum source and an alkali-treated silicon source at -20 DEG C to 100 DEG C to prepare sol, then putting the sol in a reaction kettle for crystallizing; and washing, drying and roasting a sample after crystallizing to prepare the hierarchical porous structure SAPO molecular sieve. The preparation method of the hierarchical porous structure silicon-phosphorus-aluminum SAPO molecular sieve can be applied to industrial production of the hierarchical porous structure molecular sieve.

Description

technical field [0001] The invention relates to a SAPO molecular sieve with hierarchical pore structure and a preparation method thereof. Background technique [0002] SAPO-34 molecular sieve is a silicoaluminophosphate molecular sieve developed by United Carbide Corporation (UCC), which has suitable acidity and pore structure, large specific surface area, good adsorption performance, thermal stability and hydrothermal stability. At present, it can be said that it is the best catalyst to promote the reaction process of methanol to olefins. However, as a typical gas-solid heterogeneous reaction, the pores of SAPO-34 molecular sieve are prone to carbon deposition due to internal and external diffusion resistance, coupled with the strong exothermic characteristics of the reaction itself, resulting in rapid catalyst deactivation. [0003] In order to solve the above problems, in recent years, researchers have taken a series of measures to improve the performance of catalysts fr...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B01J29/85C07C1/20C07C11/02
CPCB01J29/85B01J2229/60B01J2523/31B01J2523/41B01J2523/51C01B37/08C01B39/54C01P2004/03C01P2006/12C01P2006/16C01P2006/17C07C1/20C07C11/04C07C11/06Y02P30/20Y02P30/40
Inventor 杨贺勤刘志成高焕新
Owner CHINA PETROLEUM & CHEM CORP
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