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Method for synthesizing zeolite on cordierite carrier

A technology for synthesizing zeolite and cordierite, which is applied in the direction of separation methods, chemical instruments and methods, molecular sieves and alkali exchange compounds, etc., can solve the problems of harsh synthesis conditions, unfavorable zeolite synthesis, and uneven growth of zeolite on the carrier surface, etc., to achieve The effect of low processing cost, easy control of synthesis conditions, and simple method

Inactive Publication Date: 2009-11-11
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent US4800187 uses in-situ synthesis technology to synthesize a variety of zeolites on the surface of honeycomb ceramics. Patent US4904518 hydrothermally synthesizes ZSM-5, ZSM-11 and other zeolites on the surface of silicon wafers. The growth is very uneven, so the patent CN99112822 proposes to dip-coat a layer containing Al on the cordierite ceramics. 2 o 3 , SiO 2 and Na 2 The O gel solution is then loaded and synthesized, using a series of chemical reactions that occur during the dip coating process, which can make the carrier surface and the zeolite layer bonded very firmly.
Its series of patents 99120818 used the same method to synthesize ferrierite on cordierite; the problem brought about by this method is that the dipping coating introduces new substances as part of the raw materials for zeolite synthesis and participates in the synthesis process, resulting in harsh synthesis conditions. Not conducive to the synthesis of zeolite

Method used

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  • Method for synthesizing zeolite on cordierite carrier
  • Method for synthesizing zeolite on cordierite carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The cordierite with a volume of 5ml was treated in a 50% oxalic acid solution with a mass concentration at 80℃ for 6 hours, washed with deionized water to neutrality, and then put into a 10% mass concentration sodium hydroxide solution at 80℃ Lower treatment for 5 hours, wash and dry at 120℃, then put it into MCM-22 synthetic solution, the molar ratio of each component in MCM-22 synthetic solution is SiO 2 : Al 2 O 3 : Na 2 O: HMI: H 2 O=1:0.33:0.1:0.35:20, the silicon source used is silica gel, and the aluminum source is sodium metaaluminate. Crystallized at 140°C for 72 hours. Take out the treated cordierite, dry it at 120°C for 12 hours, roast it at 540°C for 10 hours, and ultrasonically clean it for 20 minutes. The XRD characterization results are shown in figure 1 , Indicating that MCM-22 zeolite was synthesized on the carrier, and the electron microscope results (see figure 2 ) Shows that the cordierite surface is firmly loaded with a layer of MCM-22 zeolite, which c...

Embodiment 2

[0016] The carrier treatment process and the support synthesis process were the same as in Example 1, using citric acid with a concentration of 60%, the treatment temperature was 70°C, and the time was 10 hours. The silicon source used was ethyl orthosilicate, XRD results showed that the supported zeolite was MCM-22 zeolite, and the loading amount was 40%.

Embodiment 3

[0018] The carrier treatment process and the supported synthesis process are the same as in Example 1. The molar ratio of the components of the MCM-22 synthesis solution is SiO 2 : Al 2 O 3 : Na 2 O:HMI:H2O=1:0.25:0.12:0.35:20, XRD results show that the loaded zeolite is MCM-22 and some mordenite impurities.

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Abstract

The invention provides a method for in-situ synthesis of zeolite on a cordierite carrier, which comprises the following steps: performing acidizing on cordierite by acid; processing the cordierite by alkali; and synthesizing in MCM-22 synthetic fluid at high temperature and high pressure. The method of the invention performs combined treatment on the cordierite by the acid and the alkali, not only can increase the external surface area of the cordierite, but also can form a great deal of -OH in the zeolite synthetic fluid, contributes to MCM-22 load synthesis, and has simplicity, easy grasp and easy control of synthetic conditions; and the obtained loaded zeolite has firm combination.

Description

Technical field [0001] The invention relates to a method for supporting synthetic zeolite, in particular to a method for synthesizing MCM-22 zeolite on a cordierite ceramic carrier. Background technique [0002] Supported zeolite (zeolite membrane on carrier) has very important application value in catalysis science and separation science. For example, membrane reactors used in the separation process of petrochemicals and monolithic catalytic converters used to purify automobile exhaust gas use zeolite loaded on different carriers. Generally, there are two methods for loading zeolite: one is to immerse the carrier in a slurry containing zeolite, so that the surface of the carrier is loaded with a layer of zeolite, which is called the loading method. This method is simple to operate but will cause the zeolite coating layer and the surface of the carrier to not be firmly bonded , The zeolite layer is easy to peel off. Another method is called in-situ support synthesis technology, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/70B01J21/16C01B39/00B01D53/94
Inventor 陈标华金映李英霞
Owner BEIJING UNIV OF CHEM TECH
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