Method for preparing mordenite molecular sieve

A technology of zeolite molecular sieve and mordenite, which is applied in the field of synthesis of zeolite molecular sieve, can solve the problems of large synthetic particle size and achieve the effects of reducing synthesis cost, shortening crystallization time, and less pollution

Active Publication Date: 2012-09-12
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN 1050011A reports the synthesis method of using cheap water glass as the silicon source mordenite as the seed crystal to prepare high silicon-aluminum ratio mordenite. The highest silicon-aluminum ratio can

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  • Method for preparing mordenite molecular sieve
  • Method for preparing mordenite molecular sieve
  • Method for preparing mordenite molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 9.50 g NaOH to 190 ml of deionized water, stir until a clear solution, add 4.8 g of sodium metaaluminate to the above solution, continue stirring at room temperature until the solids are completely dissolved, then add 200 ml of water, and continue stirring for 15 minutes . Add 29.1 g of fuming silica gel to the above mixed solution, continue to stir strongly for 1 hour, then add 1.7 g of ZSM-5 zeolite molecular sieve as a seed crystal into the reaction system, continue to stir for 0.5 hours after the addition, and finally put the mixture into Put it into a polytetrafluoroethylene-lined stainless steel crystallization kettle, seal it and crystallize in an oven at 170°C for 24 hours, and obtain a solid product after conventional suction filtration, washing, and drying; the molar composition of the initial sol of the mixture is: SiO 2 :Al 2 o 3 =20, Na 2 O: SiO 2 =0.25,H 2 O: SiO 2 =45.

[0024] The solid product is analyzed as mordenite by X-ray, and its SiO ...

Embodiment 2

[0026] Except that Silicate-1 zeolite molecular sieve was used instead of ZSM-5 zeolite molecular sieve in Example 1 as the seed crystal, other preparation conditions were the same as in Example 1. The X-ray diffraction spectrum of the product hasfigure 1 Characterization, demonstrated for mordenite molecular sieves.

Embodiment 3

[0028] Except that the ZSM-11 zeolite molecular sieve was used as the seed crystal instead of the ZSM-5 zeolite molecular sieve in Example 1, other preparation conditions were the same as in Example 1. The X-ray diffraction spectrum of the product has figure 1 Characterization, demonstrated for mordenite molecular sieves.

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Abstract

The invention relates to a method for preparing a mordenite molecular sieve. The method comprises the following steps of: dissolving an aluminum source in a sodium hydroxide solution, adding silicon sources, stirring at room temperature by strong magnetic force, and dispersing for a period of time; mixing the silicon sources which are dispersed uniformly and an aluminum source solution to form glue, adding a zeolite molecular sieve containing a five-membered ring as a crystal seed, stirring and mixing uniformly by the strong magnetic force at room temperature, and transferring the mixture into a reaction crystallization kettle, and performing crystallization reaction at the temperature of between 150 and 170 DEG C for 0.5 to 3 days; and performing suction filtration, washing and drying conventionally to obtain the mordenite molecular sieve. According to the method, an expensive organic amine template agent is not used as a structure guiding agent, and the zeolite molecular sieve which is wide in using, low in cost and readily available and contains the five-membered ring is used as the crystal seed to synthesize the mordenite molecular sieve with a high silica-alumina ratio directly, so the prepared mordenite molecular sieve has the advantages of high crystallinity and purity, controllable granular sizes and appearance, high yield, convenience for industrial production and the like.

Description

technical field [0001] The invention relates to the synthesis of zeolite molecular sieves, in particular to a synthesis method of mordenite molecular sieves. Specifically, it is a method for synthesizing mordenite molecular sieves by adding zeolite molecular sieves containing five-membered rings as crystal seeds without using organic ammonium as a structure-directing agent. Background technique [0002] Microporous molecular sieves have uniform pore structure, suitable acidity and good hydrothermal stability, and have become important petrochemical catalytic materials. Hydrogen-type mordenite with one-dimensional twelve-membered ring straight cylindrical channels (pore size 0.695 nm × 0.581 nm) exhibits excellent catalytic performance in toluene disproportionation, alkylation, isomerization of C8 aromatics and selective disproportionation of toluene . However, the mordenite molecular sieves synthesized by traditional methods usually have a relatively low silicon-aluminum r...

Claims

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Application Information

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IPC IPC(8): C01B39/26B82Y40/00
Inventor 张坤马晓静罗琛徐浪浪袁恩辉吴鹏
Owner EAST CHINA NORMAL UNIVERSITY
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