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Preparation method of mesoporous mordenite

A mordenite and mesoporous technology, which is applied in the synthesis field of high-purity mesoporous mordenite molecular sieves, to achieve the effect of shortening the crystallization time and facilitating the growth of agglomeration

Active Publication Date: 2012-07-25
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The results of literature and Chinese patent surveys show that the synthesis of high-purity mesoporous mordenite with low cost and environmental friendliness has not been reported yet.

Method used

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  • Preparation method of mesoporous mordenite
  • Preparation method of mesoporous mordenite
  • Preparation method of mesoporous mordenite

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Add 9.50 g of NaOH to 190 ml of deionized water, stir until a clear solution, add 4.8 g of sodium metaaluminate to the above solution, and continue stirring at room temperature until all the solids are dissolved. Add 29.1 g of fuming silica gel to the above mixed solution, continue strong magnetic stirring for 1 hour, then mix 1.7 g of dealuminated mordenite molecular sieve (SiO 2 : Al 2 o 3 = 80) into the reaction system as a seed crystal, and continued to stir for 0.5 hours after the addition, and finally put the mixture into a polytetrafluoroethylene-lined stainless steel crystallization kettle, sealed it and crystallized it in an oven at 170 °C for 24 hours. The solid product was obtained 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 2 : Al 2 o 3 T...

Embodiment 2

[0026] SiO 2 : Al 2 o 3 The dealuminated mordenite with a mol ratio of 40.0 replaces SiO in Example 1 2 : Al 2 o 3 Except that dealuminated mordenite with a molar ratio of 80.0 was used as the seed crystal, other preparation conditions were the same as in Example 1, and the specific surface area of ​​mordenite was 419 m 2 / g, pore volume 0.32 ml / g, mesopore volume 0.20 ml / g.

Embodiment 3

[0028] Except that aluminum nitrate was used instead of sodium metaaluminate in Example 1 as the aluminum source, other preparation conditions were the same as in Example 1, and a high-purity mordenite molecular sieve with abundant mesoporous pores was obtained, with a specific surface area of ​​410 m 2 / g, pore volume 0.31 ml / g, mesopore volume 0.21 ml / g.

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Abstract

The invention discloses a method for synthesizing a mesoporous mordenite molecular sieve. The method comprises the following steps of: dissolving an aluminum source in a sodium hydroxide solution; adding a silicon source and stirring to disperse for a certain period of time at room temperature under strong magnetic force, wherein the uniformly dispersed solution of silicon source and aluminum source is mixed into glue at room temperature; adding a dealuminated mordenite molecular sieve as seed crystal; stirring and uniformly mixing at room temperature under strong magnetic force, and transferring the product into a reaction crystallization kettle; performing crystallization reaction at 150-170 DEG C for 0.5-3 days; and performing conventional suction filtration, washing and drying to obtain a solid product. The synthesis method disclosed by the invention has the characteristics that the expensive organic amine template agent is not used as a structure directing agent, and the cheap and easily-available inorganic layered precursor with wide source is used as the seed crystal to directly synthesize a mordenite molecular sieve with high silica-alumina ratio; and the prepared nano mordenite molecular sieve has the advantages of high crystallinity and purity, abundant accumulation meso pores, controllable particle size, form and low cost, less environment pollution and convenience for industrial large-scale production.

Description

technical field [0001] The invention relates to the synthesis of zeolite molecular sieves, in particular to a synthesis method of high-purity mesoporous mordenite molecular sieves. Specifically, it is a method for synthesizing high-purity mesoporous mordenite molecular sieves by adding dealuminated mordenite molecular sieve as a nucleation accelerator (seed crystal) and adjusting synthesis conditions 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 ...

Claims

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Application Information

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IPC IPC(8): C01B39/26B82Y40/00
Inventor 张坤徐浪浪吴海虹陈丽吴鹏
Owner EAST CHINA NORMAL UNIV
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