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Method for catalytic oxidation NO with ZSM-5 type molecular sieve as catalyst

A catalytic oxidation, ZSM-5 technology, applied in molecular sieve catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of high active temperature and poor water vapor resistance, and achieve simple operation, low cost, and reduced consumption and cost. Effect

Inactive Publication Date: 2008-09-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved in the present invention is to provide a method for catalytic oxidation of NO using ZSM-5 molecular sieve as a catalyst to solve the shortcomings of poor water vapor resistance and high activation temperature of NO oxidation catalysts in the prior art

Method used

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  • Method for catalytic oxidation NO with ZSM-5 type molecular sieve as catalyst

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Experimental program
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Effect test

Embodiment 1

[0030] Na-ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 =300), into powder, its specific surface area is 300m 2 / g, the single crystal grain size is 1μm~3μm, and the pore size is 0.56nm. Dry at 110°C for 2 hours, calcined at 500°C for 3 hours, tablet, crush and sieve the powdered Na-ZSM-5 to obtain 0.6mm-0.9mm particles, which is the catalyst used in this experiment.

Embodiment 2

[0032] Take the H-ZSM-5 type molecular sieve (SiO 2 / Al 2 o 3 =300), into powder, its physical properties are the same as the molecular sieve in Example 1. The specific implementation method is also the same as above, and the particles of 0.6mm to 0.9mm are obtained for subsequent use.

Embodiment 3

[0034] Take 40g of Na-ZSM-5 raw powder from Shanghai Zhuoyue Chemical Co., Ltd. and mix it with 0.8mol / L and 300ml copper nitrate solution, reflux and stir at 80°C for 8 hours to carry out ion exchange reaction, and after the reaction, use a centrifuge to separate and wash until There is no metal ion in the lotion, and then dried at 110°C overnight, roasted at 550°C for 2 hours, pressed into tablets, crushed, and sieved to obtain 0.6mm-0.9mm particles for future use.

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Abstract

The invention discloses a method for catalytic oxidizing NO with a ZSM-5 type molecular sieve as catalyst, which uses an H type, a Na type and the ZSM-5 type molecular sieve exchanged with, metallic ion as catalyst and uses the O2 in aerobic NOx exhaust gas as oxidant to oxidize the NO in the aerobic NOx exhaust gas into NO2 under the condition of 0-100 DEG C; the moisture content of the aerobic NOx exhaust gas is counted as 0 percent to 100 percent according to the relative humidity at ambient temperature. The Si / A1 rate of the ZSM-5 molecular sieve is no less than 30 to full silicon, which is provided with good low temperature catalytic activity and hydrophobicity and still can keep good catalytic activity when the relative humidity reaches 100 percent, thus solving the difficult problems of bad water-resistant performance and high activity temperature in traditional NO oxidation catalyst, which is especially suitable for NOx desorption of low temperature emission source of aerobic exhaust gas. At the same time, the method has the advantages of simple operation and low cost, which has good promotional value.

Description

(1) Technical field [0001] The invention relates to a method for catalytically oxidizing NO. (2) Background technology [0002] NO x It is the basis of nitric acid rain, photochemical smog, and one of the main substances that destroy the ozone layer, causing great harm to the ecological environment and human health. It mainly comes from automobile exhaust, flue gas mainly from coal-fired power plants, and industrial waste gas from nitric acid plants and nitric acid plants. Relevant information shows: Global NO x Emissions have reached 35-58Mt / a, of which NO accounts for NO x The total amount is 90% to 95%. due to NO x The exhaust gas also contains O 2 and a small amount of SO 2 , CO, H 2 O etc. This gives the elimination of NO x Pollution poses great challenges. At present, people adopt reasonable treatment methods according to different pollution sources. For automobile exhaust, three-way catalysts are generally used to catalyze the oxidation and reduction of NO ...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/86B01J29/42
Inventor 陈银飞刘华彦李玉芳卢晗锋袁从慧
Owner ZHEJIANG UNIV OF TECH
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