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ZSM-5 molecular sieve and preparation method thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of complex preparation methods, inappropriate particle size, and environmental pollution, and achieve crystal The effects of uniformity, reduction of preparation cost, and high value-added utilization

Active Publication Date: 2015-07-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In view of the unsuitable particle size of ZSM-5 molecular sieve in the prior art, the particle size of ZSM-5 molecular sieve prepared from natural minerals as raw material is large, the crystallinity is low, the preparation method is complicated, and the problem of polluting the environment, the purpose of the present invention is to provide a A submicron-level ZSM-5 molecular sieve with high crystallinity prepared from natural minerals and a preparation method thereof, the preparation process of the molecular sieve is simple, the raw materials are easy to obtain, the yield is high, no template agent is used, and no roasting treatment is required , conducive to environmental protection and energy saving

Method used

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  • ZSM-5 molecular sieve and preparation method thereof
  • ZSM-5 molecular sieve and preparation method thereof

Examples

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Effect test

Embodiment 1

[0088] A preparation method of ZSM-5 molecular sieve, comprising the steps of:

[0089] (1) Raw material pretreatment:

[0090] Pulverize the coal gangue to obtain coal gangue powder with an average particle size of less than 10 μm; then roast the coal gangue powder at 900°C for 2 hours; 1:5 acid leaching, the temperature of acid leaching is 80°C, and the time is 2h; after that, the solid-liquid mixture of acid leaching is filtered and washed, and the solid precursor obtained is SiO in the solid precursor 2 / Al 2 o 3 The molar ratio of is 21;

[0091] (2) Mix the solid precursor, alkali and water at a ratio of 1:0.10:10 to prepare a slurry mixture, wherein the solid precursor is the acid-treated coal gangue (SiO 2 / Al 2 o 3 =21); then add 1.0wt% ZSM-5 molecular sieve purchased from Nankai University Catalyst Factory to the mixture as a seed crystal, grind to obtain a uniform slurry, and let it stand for 3 hours;

[0092] (3) Put the slurry obtained in step (2) in a reac...

Embodiment 2

[0095] A preparation method of ZSM-5 molecular sieve, comprising the steps of:

[0096] (1) Raw material pretreatment:

[0097] Pulverize the coal gangue to obtain coal gangue powder with an average particle size of less than 10 μm; then roast the coal gangue powder at 900°C for 2 hours; 1:5 acid leaching, the temperature of acid leaching is 80°C, and the time is 2h; after that, the solid-liquid mixture of acid leaching is filtered and washed, and the solid precursor obtained is SiO in the solid precursor 2 / Al 2 o 3 The molar ratio of is 21;

[0098] (2) Mix the solid precursor, alkali and water at a ratio of 1:0.10:10 to prepare a slurry mixture, wherein the solid precursor is the acid-treated coal gangue (SiO 2 / Al 2 o 3 =21); then add 1.0wt% of the ZSM-5 molecular sieve prepared in Example 1 to the mixture as a seed crystal, grind to obtain a uniform slurry, and let it stand for 4 hours;

[0099] (3) Put the slurry obtained in step (2) in a reaction kettle, conduct ...

Embodiment 3

[0105] A preparation method of ZSM-5 molecular sieve, comprising the steps of:

[0106] (1) Raw material pretreatment:

[0107] Pulverize the coal gangue to obtain coal gangue powder with an average particle size of less than 10 μm; then roast the coal gangue powder at 600°C for 20 hours; 3 solution, with a solid-to-liquid ratio of 1:5 for acid leaching, the temperature of acid leaching is 80°C, and the time is 1h; after that, the solid-liquid mixture of acid leaching is filtered and washed, and the solid precursor obtained is SiO in the solid precursor. 2 / Al 2 o 3 The molar ratio of is 16.7;

[0108] (2') Preparation of seed crystals

[0109] Take part of the solid precursor obtained in step (1), alkali and water and mix them in a ratio of 1:0.183:11.67 to prepare a slurry mixture, wherein the solid precursor is the acid-treated coal gangue (SiO 2 / Al 2 o 3=16.7), the mixture was ground to obtain a uniform slurry; then the obtained slurry was placed in a reaction kett...

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Abstract

1)pretreating mineral raw materials containing silicon and aluminium to obtain a solid predecessor; 2)mixing the solid predecessor, sodium hydroxide and water to obtain a mixture, adding the ZSM-5 molecular sieve seeds, uniformly mixing, then grinding to obtain an uniform slurry, standing for aging; and 3)placing the slurry in a reaction vessel for a hydrothermal crystallization reaction, after reaction is finished, filtering, washing filter residue, and drying to obtain the ZSM-5 molecular sieve. According to the invention, a template is added in a synthetic method of the ZSM-5 molecular sieve, calcination is not be carried out for removing the template, the natural mineral raw materials containing silicon and aluminium are employed, technology is simplified, cost is reduced, and the preparation method has the advantages of environmental protection and energy saving. The ZSM-5 molecular sieve has high crystallization degree, and the particle size is submicron.

Description

technical field [0001] The invention relates to the field of deep processing of mineral resources, in particular to a ZSM-5 molecular sieve and a preparation method thereof, and further relates to a submicron ZSM-5 molecular sieve and a preparation method thereof. Background technique [0002] ZSM-5 molecular sieve was first reported by Mobil in 1972. It is a five-membered ring zeolite. Its basic structural unit is composed of 8 five-membered rings. This basic structural unit is connected into a chain structure through oxygen bridges, and then It forms a zeolite framework and has a two-dimensional 10×10 ring channel structure (0.56nm×0.53nm and 0.55nm×0.51nm) (edited by Xu Ruren et al., Chemistry of Molecular Sieves and Porous Materials, 2004). The unique pore structure and acidity of ZSM-5 molecular sieve make it widely used as a shape-selective solid acid catalyst material in the deep processing of low-carbon olefins and aromatization, isomerization, alkylation, dealkylati...

Claims

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Application Information

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IPC IPC(8): C01B39/38
Inventor 卢旭晨潘锋王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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