Preparation method and application of hierarchical porous ZSM-5 molecular sieve

A ZSM-5, molecular sieve technology, applied in molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of restricting the industrial production and application of multi-level porous ZSM-5 molecular sieves, discharging a large amount of synthetic waste liquid, and single-pot synthesis. problems such as low efficiency, to achieve good industrial application prospects, significant economic and environmental benefits, and the effect of improving synthesis efficiency

Inactive Publication Date: 2018-10-16
SHENYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesis method of multi-stage pore ZSM-5 molecular sieve is relatively complicated, the preparation conditions of high temperature and high pressure are harsh, the single-pot

Method used

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  • Preparation method and application of hierarchical porous ZSM-5 molecular sieve
  • Preparation method and application of hierarchical porous ZSM-5 molecular sieve
  • Preparation method and application of hierarchical porous ZSM-5 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0033]A preparation method of a multi-stage pore ZSM-5 molecular sieve: 3.2 g of surfactant cetyltrimethylammonium bromide is dissolved in 40.0 g of deionized water, and stirred at room temperature until completely dissolved to form a mixed solution A; Then add 0.2g of aluminum isopropoxide and 10.4g of tetraethyl orthosilicate, stir in a constant temperature water bath at 40°C for 2h to form a mixed solution B; then add 3.0g of tetrapropylammonium hydroxide dropwise to the B solution, A mixed solution is formed, and the above mixed solution is heated to 60°C and stirred in a constant temperature water bath for 24 hours for aging to form a mixture of molecular sieves to synthesize an initial sol-gel; place the above-mentioned initial sol-gel in an oven at 100°C for 24 hours to obtain a molecular sieve synthetic dry gel, dry The glue was transferred to the crystallization kettle, and the molecular sieve crystallization process was realized by steam-assisted crystallization metho...

Embodiment 2

[0036] A preparation method of a multi-stage porous ZSM-5 molecular sieve: Dissolve 2.8 g of surfactant cetyltrimethylammonium bromide in 36.0 g of deionized water, stir at room temperature until completely dissolved, and form a mixed solution A; Then add 0.4g of aluminum isopropoxide and 20.8g of tetraethyl orthosilicate, stir in a constant temperature water bath at 40°C for 2h to form a mixed solution B; then add 6.0g of tetrapropylammonium hydroxide dropwise to the B solution, A mixed solution is formed, and the above mixed solution is heated to 60°C and stirred in a constant temperature water bath for 24 hours for aging to form a mixture of molecular sieves to synthesize an initial sol-gel; place the above-mentioned initial sol-gel in an oven at 100°C for 24 hours to obtain a molecular sieve synthetic dry gel, dry The glue was transferred to the crystallization kettle, and the molecular sieve crystallization process was realized by steam-assisted crystallization method. The...

Embodiment 3

[0038] A preparation method of a multi-stage porous ZSM-5 molecular sieve: Dissolve 1.6 g of surfactant cetyltrimethylammonium bromide in 40.0 g of deionized water, stir at room temperature until completely dissolved, and form a mixed solution A; Then add 0.2g of aluminum isopropoxide and 10.4g of tetraethyl orthosilicate, stir in a constant temperature water bath at 40°C for 2h to form a mixed solution B; then add 6.0g of tetrapropylammonium hydroxide dropwise to the B solution, A mixed solution is formed, and the above mixed solution is heated to 60°C and stirred in a constant temperature water bath for 24 hours for aging to form a mixture of molecular sieves to synthesize an initial sol-gel; place the above-mentioned initial sol-gel in an oven at 100°C for 24 hours to obtain a molecular sieve synthetic dry gel, dry The glue was transferred to the crystallization kettle, and the molecular sieve crystallization process was realized by steam-assisted crystallization method. The...

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Abstract

The invention provides a preparation method for a hierarchical porous ZSM-5 molecular sieve. According to the preparation method for the hierarchical porous ZSM-5 molecular sieve, in a synthesis system of a silicon source, an aluminum source, an organic structure directing agent and deionized water, a proper amount of cationic surfactant cetyl trimethyl ammonium bromide is added to serve as a softtemplate agent, full stirring and uniform mixing are carried out so as to form molecular sieve synthesis sol-gel, then the sol-gel is dried so as to obtain dry glue, and then the hierarchical porousZSM-5 molecular sieve is prepared by using a dry glue conversion method. The preparation method for the hierarchical porous ZSM-5 molecular sieve has the advantages of being mild in preparation conditions, simple, convenient to use, high in efficiency, free of emission of synthetic waste liquid, environmentally friendly and capable of realizing industrial production, the good catalytic performanceis realized in the reaction of preparing the low-carbon olefins through catalytic cracking of n-octane, and therefore, remarkable environmental benefits and economic benefits can be achieved, and theindustrial production prospect is good.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to a method for synthesizing a multi-stage pore ZSM-5 molecular sieve, and uses the prepared multi-stage pore molecular sieve as a catalyst for catalytic cracking of hydrocarbons to produce low-carbon olefins. Background technique [0002] Low-carbon olefins such as ethylene and propylene are the most basic raw materials in the chemical industry. With the rapid development of my country's national economy, the market demand for low-carbon olefins is increasing day by day, so the research and development of new and efficient low-carbon olefins preparation technology has attracted more and more attention. At present, the production technologies of low-carbon olefins mainly include steam thermal cracking, catalytic cracking, methanol to olefins, olefins disproportionation, propane dehydrogenation and Fischer-Tropsch synthesis. Among the above proc...

Claims

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Application Information

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IPC IPC(8): C01B39/40B01J29/40C07C4/06C07C11/04C07C11/06
CPCB01J29/40C01B39/40C01P2002/72C01P2004/03C07C4/06C07C2529/40C07C11/04C07C11/06Y02P20/52
Inventor 赵震肖霞范晓强孔莲于学华
Owner SHENYANG NORMAL UNIV
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