Method for preparing nano ZSM-5 molecular sieve

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 high cost, pollution, low crystallinity, etc., and achieve product quality , save production cost, and the effect of simple and easy process

Inactive Publication Date: 2011-04-06
岳阳三生化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The organic amines used in the above methods have the disadvantages of high cost and pollution in the production process
The shortcoming of thi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take by weighing 6.0 grams of NaOH (NaOH≥96%wt%, analytically pure), 2.46 grams of NaAlO 2 (Sinopec, Yueyang Changling Catalyst Factory), add 203 grams of deionized water, NaOH, NaAlO 2 , deionized water was put into a 500 ml round-bottomed three-neck flask, stirred at a speed of 300 rpm for 3 hours, and the temperature of the water bath was controlled at 70° C. to make the solution evenly mixed. Then slowly add 130ml of silica sol (SiO 2 content of 30%wt%, produced by Qingdao Ocean Chemical Factory), after the silica sol was added dropwise, the prepared glue solution was aged at room temperature for 24 hours. Put the aged glue into a crystallization tank, seal it, and crystallize it at a temperature of 180°C for 50 hours. Cool to room temperature, wash with deionized water, filter with suction, dry at 120°C for 10 hours, and roast to obtain the ZSM-5 product.

Embodiment 2

[0047] Take by weighing 6.0 grams of NaOH (NaOH≥96%wt%, analytically pure), 2.46 grams of NaAlO 2 (Sinopec, Yueyang Changling Catalyst Factory), add 203 grams of deionized water, NaOH, NaAlO 2 , deionized water was put into a 500 ml round-bottomed three-neck flask, stirred at a speed of 300 rpm for 3 hours, and the temperature of the water bath was controlled at 70° C. to make the solution evenly mixed. Then slowly add 130ml of silica sol (SiO 2 Content 30% wt%, produced by Qingdao Ocean Chemical Factory). After the silica sol was added dropwise, the prepared glue solution was aged at room temperature for 24 hours. Add 2% of the product prepared in Example 1 as a seed crystal according to the mass ratio to the aged glue, stir evenly, put it into a crystallization tank, seal it, and crystallize at a temperature of 180° C. for 30 h. Cool to room temperature, wash with deionized water, filter with suction, dry at 120°C for 10 hours, and roast to obtain the ZSM-5 product.

Embodiment 3

[0049] Same as Example 2, the difference is to take an appropriate amount of NaOH, NaAlO 2 , deionized water, slowly drop 104ml of silica sol.

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PUM

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Abstract

The invention discloses a method for preparing a nano ZSM-5 molecular sieve, comprising the steps of preparing a precursor, crystallizing, filtering, drying and roasting. The precursor is prepared by adopting a two-step method; a mixed solution is prepared by adopting a template-free method; a mixed glue solution is prepared by a stirring and dropping method; and the granularity of the molecular sieve obtained by roasting is 50-100 nanometers. In the step of preparing the mixed solution by using the template-free method, NaOH and NaAlO2 in a reactor and deionized water are stirred at the rotating speed of 200-300/min and the bath temperature of 60-90DEG C for 2-4 hours to obtain the uniformly-mixed solution, wherein the mass ratio of the NaOH to the NaAlO2 to the deionized water is 10:(3-6):(320-380). In the step of preparing the mixed glue solution by the stirring and dropping method, silica sol is slowly dropped in the solution according to the volume ratio while the mixed solution is continuously stirred; the mixed glue solution is obtained after the silica sol is dropped; and the volume ratio of the mixed solution to the silica sol is 200:(115-135).

Description

technical field [0001] The invention relates to a method for preparing nano ZSM-5 molecular sieve. Background technique [0002] In the early 1970s, Mobil Corporation of the United States introduced ammonium salt as a template into the hydrothermal synthesis system of molecular sieves, and first successfully synthesized ZSM-5 molecular sieves. This high-silicon medium-porous zeolite with MFI topology has a unique pore structure and excellent physical and chemical properties because it has no cage. ZSM-5 zeolite is a crystalline silicate catalytic material, which is made into a catalyst and widely used in petroleum refining, petrochemical and fine chemical synthesis. ZSM-5 zeolite has a unique crystal structure and shape-selective catalytic performance, no corrosion, no pollution, and can be recycled and reused. It is an important catalytic material for the development of green chemical processes. The application of ZSM-5 zeolite has penetrated into almost every field of he...

Claims

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Application Information

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IPC IPC(8): C01B39/38
Inventor 万焱波黄道培周继承
Owner 岳阳三生化工有限公司
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