Preparation method of water-surface active agent-alcohol system small crystal grain Beta zeolite

A surfactant and beta zeolite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve problems such as difficulty in mass production, unseen problems, and achieve the goal of improving yield, simplifying operation process, and avoiding damage. Effect

Inactive Publication Date: 2010-06-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kantam and others even use supercritical fluid to synthesize nano-beta zeolite, with high yield but difficult mass production
In conclusion, although there are methods for synthesizing small crystal β zeolite, there is no report about the synthesis in water-surfactant-alcohol system so far.

Method used

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  • Preparation method of water-surface active agent-alcohol system small crystal grain Beta zeolite
  • Preparation method of water-surface active agent-alcohol system small crystal grain Beta zeolite
  • Preparation method of water-surface active agent-alcohol system small crystal grain Beta zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 0.134g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 8.0g of 25wt% tetraethylammonium hydroxide solution, then 2.0g of white carbon black was added, stirred evenly and then put into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and stirred and reacted in an oil bath at 140°C 47h. Add the above-mentioned pretreated precursor to a mixed solution containing 0.085g CTAB and 18mL n-butanol, mix well, and crystallize at 140°C for 7-14 days to obtain the starting gel SiO 2 / Al 2 o 3 50 small grain beta zeolite.

Embodiment 2

[0030] 0.067g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 8.0g of 25wt% tetraethylammonium hydroxide solution, then 2.0g of white carbon black was added, stirred evenly and then put into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and stirred and reacted in an oil bath at 140°C 22h. Add the above pretreated precursor to a mixed solution containing 0.032g CTAB and 7mL n-butanol, mix well, and crystallize at 140°C for 7-14 days to obtain the starting gel SiO 2 / Al 2 o3 100 small grain beta zeolite.

Embodiment 3

[0032] 0.033g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 8.0g of 25wt% tetraethylammonium hydroxide solution, then 2.0g of white carbon black was added, stirred evenly, and then put into a stainless steel reactor with a polytetrafluoroethylene liner, and stirred and reacted in an oil bath at 140°C 12-16h. The above pretreated precursor was added to a mixed solution containing 0.032 g CTAB and 7 mL n-butanol, and after mixing evenly, crystallized at 140 °C for 14 days to obtain the starting gel SiO 2 / Al 2 o 3 200 small grain beta zeolite.

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Abstract

The invention discloses a method for preparing small crystal grain Beta zeolite, which is characterized in that the precursor gel containing a Beta zeolite secondary structure unit serves as synthetic raw material and is added into mixed solution containing alcohol and surface active agent, and is hydrothermally crystallized. The method can overcome the defects of high water consumption and low zeolite yield of the traditional small crystal grain zeolite synthesis technology, prevent the use of raw material containing sodion in a synthesis system, so as to reduce ammonium exchange and filtration, baking and a series of processes afterwards, and improving the zeolite yield. Compared with the Beta zeolite which is prepared hydrothermally in water phase with the same synthetic raw material, the zeolite prepared through the method displays higher catalytic activity in small molecule alkane cracking reaction.

Description

technical field [0001] The present invention relates to beta zeolite microporous material and a preparation method thereof, and more particularly relates to a method for synthesizing small-grain beta zeolite using a water-surfactant-alcohol system. Background technique [0002] Microporous molecular sieves have a uniform pore structure and strong acidity, and play a very important role in acid-catalyzed reactions. For small crystal zeolite, its large external area and more exposed active centers can effectively eliminate the diffusion effect and give full play to the catalyst efficiency; its high surface energy can increase the adsorption capacity of zeolite and accelerate the adsorption speed, thus Improve the effective adsorption capacity of zeolite; its shortened pores can reduce the diffusion resistance in the crystal, and more pores exposed to the outside can not only facilitate the entry and exit of reactants or product molecules, but also prevent or reduce the impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/00
Inventor 孔令东陈海涵邰菁菁沈建东陈建民
Owner FUDAN UNIV
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