Preparation method of L zeolite containing gallium

A technology of zeolite and gallium source, which is applied in the field of preparation of L zeolite, can solve problems such as uneven distribution of metals and affect the application effect, and achieve the effects of superior performance, good thermal stability and hydrothermal stability, and wide application prospects

Inactive Publication Date: 2012-05-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other methods of introducing metal elements into zeolite, such as impregnation or ion exchange, may cause uneven distribution of metals and affect the application effect.

Method used

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  • Preparation method of L zeolite containing gallium
  • Preparation method of L zeolite containing gallium
  • Preparation method of L zeolite containing gallium

Examples

Experimental program
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Effect test

Embodiment 1

[0027] This example illustrates the preparation of Ga by using gallium metahydroxide, pseudoboehmite and silica sol 2 o 3 :Al 2 o 3 The method of zeolite L with a molar ratio of 2:8.

[0028] Get 162.9 grams of KOH, 7.0 grams of gallium metahydroxide (GaOOH), and 17.7 grams of pseudoboehmite (AlOOH) and add them to 246.0 grams of deionized water, stir and transfer to a polytetrafluoroethylene-lined autoclave for sealing. React at 150°C for 24 hours. A clear solution was obtained after cooling to room temperature, and the K in the Al / Ga precursor 2 O:Al 2 o 3 : Ga 2 o 3 :H 2 The molar ratio of O is 7:0.2:0.8:80. In this solution, slowly add 613 grams of silica sol (SiO 2 content 30wt%), stirred evenly, transferred to an autoclave, and reacted at 170°C for 36 hours. After the crystallization, the reactant was cooled to room temperature, filtered, washed and dried to obtain gallium-containing L zeolite.

Embodiment 2

[0030] This example illustrates the preparation of Ga by using gallium metahydroxide, pseudoboehmite and silica sol 2 o 3 :Al 2 o 3 The method of zeolite L with a molar ratio of 4:6.

[0031] Take 139.6 grams of KOH, 14.0 grams of GaOOH, and 13.3 grams of AlOOH and add them into 246.0 grams of deionized water, stir evenly, transfer to a polytetrafluoroethylene-lined autoclave and seal, and react at 160°C for 18 hours. A clear solution was obtained after cooling to room temperature, and the K in the Al / Ga precursor 2 O:Al 2 o 3 : Ga 2 o 3 :H 2The molar ratio of O is 6:0.4:0.6:80. In this solution, slowly add 613 grams of silica sol (SiO 2 content 30wt%), stirred evenly, transferred to an autoclave, and reacted at 160°C for 36 hours. After the crystallization, the reactant was cooled to room temperature, filtered, washed and dried to obtain gallium-containing L zeolite.

Embodiment 3

[0033] This example illustrates the preparation of Ga by using gallium metahydroxide, pseudoboehmite and silica sol 2 o 3 : Al 2 o 3 The method of zeolite L with a molar ratio of 6:4.

[0034] Take 116.3 grams of KOH, 21.0 grams of GaOOH, and 8.8 grams of AlOOH and add them to 246.0 grams of deionized water, stir evenly, transfer to a polytetrafluoroethylene-lined autoclave and seal, and react at 150°C for 36 hours. A clear solution was obtained after cooling to room temperature, and the K in the Al / Ga precursor 2 O:Al 2 o 3 : Ga 2 o 3 :H 2 The molar ratio of O is 5:0.6:0.4:80. In this solution, slowly add 613 grams of silica sol (SiO 2 content 30wt%), stirred evenly, transferred to an autoclave, and reacted at 150°C for 24 hours. After the crystallization, the reactant was cooled to room temperature, filtered, washed and dried to obtain gallium-containing L zeolite.

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Abstract

A preparation method of an L zeolite containing gallium. The method comprises steps of: preparing silicon source, aluminium source, gallium source, alkali source and water into an initial reaction mixture according to a certain feeding sequence and a method, wherein a total molar ratio of K2O: Al2O3:Ga2O3:SiO2:H2O equal to 2-20:0-1:0.01-1:6-18:40-400; crystallizing in a seal reaction kettle under hydro-thermal condition at a crystallization temperature of 120-200 DEG C for 1-192 h; filtering, washing, drying and roasting the crystallization products to obtain L zeolite with aluminium partially substituted or completely substituted by gallium in isomorphous substitution. The product has regular discoid morphology; and a catalyst prepared by using the L zeolite containing gallium has potential application prospect in alkane conversion reaction.

Description

technical field [0001] The invention relates to a preparation method of L zeolite. More specifically, the present invention relates to a method for preparing gallium-containing zeolite L. The crystallized product has a disk-like morphology and can be directly used as a catalyst carrier. Background technique [0002] L zeolite is a synthetic zeolite with twelve-membered rings and one-dimensional channels. It was first synthesized by Breck and Acara in 1965 by the classic hydrothermal crystallization method. The typical chemical composition of L zeolites is K 9 [(AlO 2 ) 9 (SiO 2 ) 27 ]·21H 2 O, belongs to the hexagonal crystal system, and its basic structural unit is cannonite cage, the skeleton silicon-aluminum ratio (molar ratio) of synthetic L zeolite SiO 2 / Al 2 o 3 = 5.2 to 7.0. L zeolite has good thermal stability and hydrothermal stability. It can be used as a catalyst active component or matrix) and other fields have important applications. [0003] The ga...

Claims

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Application Information

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IPC IPC(8): C01B39/02
Inventor 马怀军田志坚王炳春王磊徐竹生
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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