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EMT zeolite synthesizing method

A synthesis method and technology of zeolite, which are applied in chemical instruments and methods, crystalline aluminosilicate zeolite, fauhhedral crystalline aluminosilicate zeolite, etc., can solve the problems of application limitation, high price, EMT application limitation, etc., and achieve good economical efficiency. Benefits and social benefits, simple and easy production methods, and the effect of shortening the crystallization time

Active Publication Date: 2008-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These synthetic methods cannot obtain EMT zeolites in the hexagonal crystal phase
[0004] Existing methods for synthesizing EMT must use an excessive amount of highly toxic and expensive crown ether templates, as well as the huge energy consumption caused by the long crystallization time, which limits the application of EMT
In recent years, there have been few relevant reports in this area, and there has been no greater progress, which may be related to the high cost of crown ethers and the difficulty of work
CN1369433A discloses a kind of synthetic method of EMT zeolite, take 18-crown-6 ether as template agent, and add a certain amount of phosphorus-containing inorganic salt emulsions such as sodium phosphate, sodium dipolyphosphate, sodium pentapolyphosphate, etc. in the synthesis system, The amount of crown ether can be reduced by 40% to 50%, and the crystallization time can also be shortened, but the highly toxic and expensive crown ether cannot be eliminated, so the application is still limited
Also, the use of phosphorus-containing additives may make the zeolite contain a small amount of phosphorus

Method used

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Experimental program
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Embodiment 1

[0020] Embodiment 1: first a certain amount of solid silica sol (containing SiO 2 25-30%), sodium aluminate (containing Al 2 o 3 38%), sodium hydroxide and polyethylene glycol 400 templating agent are mixed, and the molar ratio of gained mixture is 35SiO 2 : 1Al 2 o 3 : 2.5Na 2 O: 7PEO: 200H 2 O. The mixture was stirred and aged at room temperature (25°C) for 24h, then transferred to a stainless steel reactor, and then heated to 110°C for crystallization for 3 days. The resulting solid precipitate was filtered, washed and dried to obtain a synthetic EMT. Calcined under atmosphere (program: 250°C for 2h, 500°C for 4h) to obtain a calcined EMT. The XRD spectrum is figure 1 (a).

Embodiment 2

[0021] Embodiment 2: first a certain amount of silica sol (SiO 2 , 25-30%), sodium aluminate (Al 2 o 3 , 38%), sodium hydroxide and polyethylene glycol 800 template solution mixed, the molar ratio of the resulting mixture is 35SiO 2 : 1Al 2 o 3 : 5.5Na 2 O: 6PEO: 800H 2 O. The mixture was stirred and aged at room temperature (30°C) for 24h, and then transferred to a stainless steel reactor; then heated to 110°C for crystallization for 3 days, and the resulting solid precipitate was filtered, washed and dried to obtain a synthetic EMT, which was Calcined in air atmosphere (program: 250°C for 2h, 500°C for 4h) to obtain a calcined EMT. The XRD spectrum is figure 1 (b).

Embodiment 3

[0022] Embodiment 3: first a certain amount of silica gel (SiO 2 , 98%), sodium aluminate (Al 2 o 3 , 38%), sodium hydroxide and polyethylene glycol 6000 template solution mixed, the molar ratio of the resulting mixture is 50SiO 2 : 1Al 2 o 3 : 2.0Na 2 O: 10PEO: 180H 2 O. The mixture was stirred and aged at room temperature (30°C) for 24h, and then transferred to a stainless steel reactor; then heated to 110°C for crystallization for 3 days, and the resulting solid precipitate was filtered, washed and dried to obtain a synthetic EMT, which was Calcined in air atmosphere (program: 250°C for 2h, 500°C for 4h) to obtain a calcined EMT. The XRD spectrum is figure 1 (c).

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Abstract

The invention discloses a synthesizing method of EMT zeolite, which comprises the following steps: adopting carbowax as moulding agent to synthesize EMT zeolite through normal hydrothermal method; improving safety in the synthesizing course; reducing pollution; saving cost; shortening crystallizing time. The invention synthesizes EMT with hexagonal crystal phase and two new octahedra zeolites, which is similar to cubic crystal phase.

Description

technical field [0001] The invention relates to a method for synthesizing EMT zeolite, in particular to a method for synthesizing EMT zeolite by using a non-crown ether template agent. Background technique [0002] EMT zeolite is a kind of faujasite, which is a hexagonal zeolite. It was first synthesized by the French in the laboratory in 1990 using 18-crown-6 template agent, and then 15-crown-5 Faujasite (FAU) in the cubic crystal phase was synthesized as a template. Later, other crown ether compounds were used as templates to synthesize the corresponding faujasite. Both of these two zeolites are composed of sodalite cages (or β cages) connected to each other through double six-membered rings, but due to the different connection methods, there are significant differences between the two, mainly as follows: EMT zeolites include Hypercage and Hypocage has two types of supercages and has a two-dimensional intersecting 12-member ring straight channel system, so the structure ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/20B01J29/08
Inventor 谷明镝王刚陈松
Owner CHINA PETROLEUM & CHEM CORP