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Honeycomb-ceramic-type monolithic catalyst, and preparation method and application thereof

A monolithic catalyst and honeycomb ceramic carrier technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of easy-to-break cordierite mechanical strength, harsh synthesis conditions, and uneven growth of molecular sieves. Achieve the effects of easy industrial application, easy control of synthesis conditions, good activity and stability

Inactive Publication Date: 2011-07-27
ZHEJIANG CENWAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Patent US4800187 uses in-situ synthesis technology to synthesize a variety of molecular sieves on the surface of honeycomb ceramics. Patent US4904518 hydrothermally synthesizes ZSM-5, ZSM-20 and other molecular sieves on the surface of silicon wafers. Molecular sieves grow unevenly, so the patent CN99112822 proposes to coat a layer containing Al on the cordierite honeycomb ceramics first. 2 o 3 , SiO 2 and Na 2 The gel solution of O is then carried out the method of loading molecular sieve, and its serial patent 99130818 adopts the same method to load and synthesize magnesium alkali molecular sieve, and this method condition is harsh to synthetic condition, so patent CN101574664 proposes to adopt cordierite first and then acid Alkali treatment and then carrying out the method of loading and synthesizing MCM-22 molecular sieve, but the operation of this method is relatively complicated, the temperature of acid-base treatment is high, and the mechanical strength of cordierite is easily damaged

Method used

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  • Honeycomb-ceramic-type monolithic catalyst, and preparation method and application thereof
  • Honeycomb-ceramic-type monolithic catalyst, and preparation method and application thereof
  • Honeycomb-ceramic-type monolithic catalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 Coating of all-silicon β molecular sieve on the surface of honeycomb ceramics

[0032] Cordierite honeycomb ceramics were treated with 10% HNO at 90°C 3 The solution was treated for 2 hours, then washed with deionized water to neutrality, dried at 110°C for 8 hours, roasted at 500°C for 3 hours, then placed in an aqueous solution of tetraethylammonium hydroxide with a mass concentration of 25%, and soaked at room temperature for 4 hours to obtain a pretreated The final honeycomb ceramic carrier.

[0033] The molar ratio of each component in the all-silicon β molecular sieve synthesis liquid is template agent: silicon source: hydrogen halide: water=0.51: 1: 0.36: 13.77, the silicon source used is tetraethyl orthosilicate (TEOS), and the template agent is Tetraethylammonium hydroxide (TEAOH), the hydrogen halide is hydrogen fluoride; accurately weigh 28.27g of TEAOH, 19.67g of TEOS, 1.70g of HF and 2g of deionized water according to the molar ratio of the fe...

Embodiment 2

[0035] The treatment temperature of the cordierite honeycomb ceramic carrier in 10% nitric acid solution is 80°C, and other operations are the same as in Example 1. By comparing the quality of cordierite before and after loading, the mass ratio of all-silicon β molecular sieve to cordierite carrier is about 0.2: 1.

Embodiment 3

[0036] Example 3 Coating all-silicon β molecular sieves on the surface of honeycomb ceramics by in-situ synthesis

[0037] Treat the cordierite honeycomb ceramic carrier in a nitric acid solution with a mass concentration of 50% at 30°C for 10 hours, and other operations are the same as in Example 1. The XRD results show that the cordierite carrier is loaded with all-silicon β molecular sieve, and the cordierite before and after loading is compared. The mass ratio of available all-silicon β molecular sieve to cordierite carrier is about 0.1:1.

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Abstract

The invention discloses a honeycomb-ceramic-type monolithic catalyst, and preparation method and application thereof. The monolithic catalyst takes honeycomb ceramic as a carrier, a Beta molecular sieve is coated on the surface of the honeycomb ceramic and taken as a coating layer, and then active component, namely precious metal, is loaded on the surface of Beta molecular sieve; the active component of the precious metal is one or two selected from palladium or platinum; in the honeycomb-ceramic-type monolithic catalyst, the mass ratio of the coating layer of the Beta molecular sieve to the honeycomb ceramic is 0.02-0.2:1, the mass ratio of the precious metal to the coating layer of the Beta molecular sieve is 0.02-0.2:1, the honeycomb ceramic is cordierite honeycomb ceramic; and in the invention, the high-silicon or full-silicon Beta molecular sieve is taken as the coating layer of the monolithic catalyst, and has the characteristics of good water resistance, high heat stability andthe like, and the monolithic burning catalyst taking the Beta molecular sieve as the coating layer can keep better activity and stability under high temperature, and suitable for being taken as catalytic combustion catalyst for application.

Description

(1) Technical field [0001] The invention relates to a monolithic catalyst, in particular to a monolithic catalyst with honeycomb ceramics as the base and all-silicon or high-silicon β molecular sieve as the coating, its preparation method and its application in the field of catalytic combustion. (2) Background technology [0002] As an exhaust gas treatment technology, catalytic combustion can effectively oxidize the small molecule volatile organic compounds contained in the exhaust gas to CO at a lower temperature. 2 and H 2 O and removed. In recent years, with people's emphasis on environmental issues, this technology has been researched and developed rapidly at home and abroad. [0003] The key to the implementation of the catalytic combustion method lies in the efficiency of the catalyst. The catalysts currently being studied can be divided into noble metal catalysts and non-noble metal oxide catalysts according to the type of active components. In practice, in order ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/00B01J35/10B01D53/86
Inventor 张泽凯王洪平陈银飞
Owner ZHEJIANG CENWAY MATERIALS CO LTD
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