Chabazite molecular sieve and application thereof

A technology of molecular sieve and chabazite, which is applied in the field of chabazite molecular sieve and its application, can solve the problems of low crystallinity of chabazite and difficulty in meeting practical application requirements, and achieve low production cost, good thermal stability and hydrothermal stability of products , The effect of improving the separation performance

Active Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crystallinity of chabazite synthesized without organic template i

Method used

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  • Chabazite molecular sieve and application thereof
  • Chabazite molecular sieve and application thereof
  • Chabazite molecular sieve and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Mix 0.4167g NaOH and 0.164g NaAlO 2 Dissolve in 26.2 g of deionized water, and add 10.55 g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide under stirring. Stirring was continued until the solid was completely dissolved and cooled to room temperature, 10.1 g of 30% silica sol was slowly added dropwise under vigorous stirring and stirring was continued for 6 hours. The mixed solution was transferred to a high-pressure reactor equipped with a polytetrafluoroethylene liner for dynamic crystallization at 160°C for 4 days. After the reaction was completed, the temperature was naturally lowered to room temperature, and the solid product was filtered out by vacuum suction, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder, and then calcined at 550° C. for 12 hours to remove the template agent, and the calcining atmosphere was air.

[0032] (2) Weigh 1g of...

Embodiment 2

[0035] (1) Mix 0.4167g NaOH and 0.156g Al(OH) 3 It was dissolved in 21.36 g of deionized water, and 10.55 g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide was added under stirring. Stirring was continued until the solid was completely dissolved and cooled to room temperature, 10.1 g of 30% silica sol was slowly added dropwise under vigorous stirring and stirring was continued for 6 hours. The mixed solution was transferred to a high-pressure reactor equipped with a polytetrafluoroethylene liner for dynamic crystallization at 160°C for 4 days. After the reaction was completed, the temperature was naturally lowered to room temperature, and the solid product was filtered out by vacuum suction, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder, and then calcined at 550° C. for 12 hours to remove the template agent, and the calcining atmosphere was air.

[0036]...

Embodiment 3

[0039] (1) Mix 0.4167g NaOH and 0.078g Al(OH) 3 It was dissolved in 21.22 g of deionized water, and 10.55 g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide was added under stirring. Stirring was continued until the solid was completely dissolved and cooled to room temperature, 10.3 g of 30% silica sol was slowly added dropwise under vigorous stirring and stirring was continued for 6 hours. The mixed solution was transferred to a high-pressure reactor equipped with a polytetrafluoroethylene liner for dynamic crystallization at 160°C for 4 days. After the reaction was completed, the temperature was naturally lowered to room temperature, and the solid product was filtered out by vacuum suction, and washed with a large amount of deionized water until the pH of the filtrate was less than 8. The product was dried at 100° C. for 12 hours to obtain a white powder, and then calcined at 550° C. for 12 hours to remove the template agent, and the calcining atmosphere was air.

[0040]...

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Abstract

The invention relates to a chabazite molecular sieve and application thereof, belonging to the field of preparation of molecular-sieve inorganic cellular materials. The chabazite molecular sieve is aninorganic porous material with a CHA topological structure formed by self-assembling of silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons, and the chabazite molecular sieve has a Si/Al molar ratio of 4 to 8, a BET-process specific surface area of 400-800 m<2>/g and a grain size of 0.8-20 [mu]m. Alkyl ammonium hydroxide and adamantyl ammonium hydroxide are used as dual templates in thepreparation of the molecular sieve, so the usage amount of expensive adamantyl ammonium hydroxide is reduced, and preparation cost is lowered. The molecular sieve has large specific surface area and pore volume; the octatomic ring pore window of the molecular sieve facilitates the improvement of CO2/N2 separation performance, and out-of-skeleton balanced cations are favorable for improving N2/O2 separation performance.

Description

technical field [0001] The invention belongs to the preparation of molecular sieve microporous materials and their application to CO 2 / N 2 and N 2 / O 2 The technical field of mixed gas separation, specifically relates to a chabazite molecular sieve and its application. Background technique [0002] Chabazite has a CHA topology, and the skeleton is staggered by double six-membered rings to form an ellipsoidal cage structure. The theoretical diameter of the eight-membered ring window is 0.38nm×0.38nm, which belongs to a typical small-pore molecular sieve. Chabazite with a high silicon-aluminum ratio (Si / Al>20) has good hydrophobicity and hydrothermal stability, and at the same time has a large specific surface area and pore volume, so it can still maintain a certain level in the presence of water vapor. adsorption separation performance. In addition, the small hole window of its eight-membered ring is conducive to the screening of mixed gases. such as CO 2 / N 2 Se...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01D53/02B01J20/18
CPCB01D53/02B01D2253/108B01D2257/102B01D2257/104B01D2257/504B01J20/186C01B39/04C01P2002/72C01P2004/03C01P2004/61C01P2004/62C01P2006/12C01P2006/17Y02P20/151Y02C20/40
Inventor 王树东郭亚孙天军赵生生乌荣光
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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