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Method for solid-phase synthesis of ZSM-5 molecular sieve by using silica fume

A ZSM-5, solid-phase synthesis technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of large resource utilization of micro-silica powder, high production efficiency, single Problems such as high pot yield

Inactive Publication Date: 2016-10-12
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 1. In view of the insufficient technology of existing synthetic ZSM-5 molecular sieves and the problem that the output of microsilica powder is very large and the utilization rate of resources is extremely low, one of the purposes of the present invention is to provide a method for directly using microsilica powder for solid-phase synthesis of ZSM -5 molecular sieve method, the method has low synthesis cost, simple treatment process, short crystallization time, fast reaction speed; high single-pot yield and high production efficiency; and the prepared ZSM-5 molecular sieve has high crystallinity, physical and chemical excellent performance

Method used

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  • Method for solid-phase synthesis of ZSM-5 molecular sieve by using silica fume
  • Method for solid-phase synthesis of ZSM-5 molecular sieve by using silica fume
  • Method for solid-phase synthesis of ZSM-5 molecular sieve by using silica fume

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh 1.315g of sodium silicate, 0.43g of ammonium chloride, 0.24g of TPABr, 0.33g of microsilica, pour it into a mortar, grind and mix for 20 minutes, put the mixture into a PTFE-lined steel reaction vessel In the kettle, crystallize at 130°C for 48h, after cooling, the reactant is ground, dissolved, suction filtered and dried in a blast drying oven at 60°C for 12 hours to obtain the final product. attached figure 1 From the characterization results of the product's XRD, it can be seen that the product has a typical MFI structure with good crystallinity. figure 2 It is a scanning electron microscope photograph of the product of Example 1.

Embodiment 2

[0029] Weigh 1.315g of sodium silicate, 0.43g of ammonium chloride, 0.24g of TPABr, and 0.33g of microsilica powder, pour it into a mortar, grind and mix for 20 minutes, then put the mixture into a Teflon-lined steel reaction vessel. In the kettle, crystallize at 140°C for 36 hours, and after cooling, the reactants are ground, dissolved, suction filtered and dried in a blast drying oven at 60°C for 12 hours to obtain the final product. attached image 3 From the characterization results of the product's XRD, it can be seen that the product has a typical MFI structure with good crystallinity. Figure 4 It is a scanning electron microscope photograph of the product of Example 2.

Embodiment 3

[0031] Weigh 1.315g of sodium silicate, 0.43g of ammonium chloride, 0.24g of TPABr, and 0.33g of microsilica powder, pour it into a mortar, grind and mix for 20 minutes, then put the mixture into a Teflon-lined steel reaction vessel. In the kettle, crystallize at 160°C for 24h, after cooling, the reactants are ground, dissolved, suction filtered and dried in a blast drying oven at 60°C for 12 hours to obtain the final product. attached Figure 5 From the characterization results of the product's XRD, it can be seen that the product has a typical MFI structure with good crystallinity. Image 6 It is a scanning electron microscope photograph of the product of Example 3.

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Abstract

The invention discloses a method for solid-phase synthesis of ZSM-5 molecular sieve by using lignite and belongs to the preparation of molecular sieves; industrial waste, silica fume, is ground and mixed directly with sodium silicate, a template agent and an alkali source without any pretreatment and is crystallized at 130-220 DEG C for 1-48 h, and a reaction product is ground, dissolved, filtered and dried to obtain the ZSM-5 molecular sieve. The silica fume not requiring any pretreatment is used as an aluminum silicon source to replace Si and Al pure chemical regents to synthesize a molecular sieve, the synthetic cost of the ZSM-5 molecular sieve is reduced, environmental dust pollution due to silica fume is reduced, and high-value utilization of silica fume is also achieved. Meanwhile, the synthetic route involves only the mixing of initial materials and no use of any solvent, preventing the waste due to massive use of clean water resources and the pollution due to mass liquid waste containing organic template agents; the synthetic process is simple, energy-saving and emission-reducing and a huge industrial application prospect.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a kind of micro-silica powder using industrial waste, without any pretreatment, directly grinding and mixing with sodium silicate, template agent and alkali source, and crystallization reaction at 130-220° C. 1~48h, the reaction product is ground, dissolved, filtered and dried to obtain the method of ZSM-5 molecular sieve. Background technique [0002] Molecular sieves are crystalline aluminosilicates with uniform pore structure. Molecular sieves are widely used as industrial catalysts or catalyst carriers due to their well-defined pore distribution, extremely high specific surface area, and good thermal stability. With the increasing importance of molecular sieve catalysts in the industry, new types of molecular sieves have been greatly activated, ranging from molecular sieves with low and medium silicon ratios, to new molecular sieves with high silicon thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72C01P2004/03C01P2006/90
Inventor 陈秀华雷正涛朱文杰
Owner YUNNAN UNIV
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