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Catalyst with meso pore characteristics and application thereof

A catalyst and mesoporous technology, applied in the field of environmental catalysis, can solve the problems of low conversion rate of pollutants, great damage, and affecting the practicality of catalysts, and achieve high catalytic activity and avoid loss

Inactive Publication Date: 2011-11-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is well known that nitrogen oxides are extremely harmful to the environment and the human body. There are two main sources of nitrogen oxides. One is fixed sources, such as power plants and nitric acid plants. At this time, nitrogen oxides are mainly due to the high-temperature combustion of coal and the preparation of nitric acid. The other is the flow source, such as: automobile, which is caused by the high temperature generated by the combustion of the internal combustion engine, which causes nitrogen and oxygen in the air to form nitrogen oxides. The current method for eliminating nitrogen oxides Catalytic methods are mainly used, such as: Co-BEA (Italian patent: MI 93A 2337), Fe-Mo / ZSM-5 (Chinese patent: Publication No. CN1401412A), Pt / Al 2 o 3 (R.Burch, J.Catal.176 (1998) 204) etc., the catalyst activity of these reports is not high, and stability is relatively poor, easily due to SO 2 , water vapor poisoning and deactivation, and the conversion rate of pollutants is low; thus, it affects the practicability of the catalyst

Method used

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  • Catalyst with meso pore characteristics and application thereof
  • Catalyst with meso pore characteristics and application thereof
  • Catalyst with meso pore characteristics and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Under constant temperature conditions of 35°C, 4 grams of P123 (triblock nonionic surfactant polyoxyethylene propylene ether polyoxypropylene ether polyoxyethylene ether) was added to a 250 ml three-necked flask, and 90 ml of deionized water was added as Solvent, after stirring until completely dissolved (about 2 hours), add 60 ml of hydrochloric acid solution (4 mol / liter) dropwise, continue stirring for 1 hour, finally slowly add 9.8 ml of tetraethylsiloxane (TEOS) dropwise, and stir for 22 hours later. Move the solution to a stainless steel reaction bottle with a polytetrafluoroethylene liner, let it stand at 100°C for 24 hours, filter and wash to neutrality after cooling, dry naturally, and roast at 550°C for 6 hours to remove the template agent (heating rate 1°C / min), the mesoporous molecular sieve SBA-15 white powder is obtained. Then, the Cu-Al / SBA-15 mesoporous material catalyst prepared by impregnation method; its transmission electron microscope picture is sh...

example 2

[0030] The SBA-15 raw powder was prepared by hydrothermal crystallization method, and then the Cr / SBA-15 mesoporous material catalyst was obtained by impregnation method, and it was aimed at the removal of nitrogen oxides in automobile exhaust. 3 h 6 , 3000ppm CO, 1% O 2 , and the space velocity is 36,000 / h. The catalytic activity is shown in Table 2: the catalyst exhibits high activity, and the nitrogen oxide conversion rate can reach 79% at 400°C. Further increasing the temperature to 600°C, the conversion rates of nitrogen oxides and hydrocarbons can reach more than 92.4%.

[0031] Table 2

[0032]

example 3

[0034] The V / MCM-41 mesoporous material catalyst prepared by the in-situ synthesis method is aimed at the removal of nitrogen oxides in the tail gas of power plants, at 3000ppm NO, 3000ppm NH 3 , 4% O 2 , and the space velocity is 55,000 / h. The catalytic activity is shown in Table 3. The catalyst exhibits high activity, and the conversion rate of nitrogen oxides can reach 66.4% at 250°C. Further raising the temperature to 300°C, the conversion rates of nitrogen oxides and hydrocarbons can reach more than 99.8%.

[0035] table 3

[0036]

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Abstract

The invention discloses a catalyst with meso pore characteristics and an application thereof. The catalyst with meso pore characteristics is produced by loading ingredients with catalytic activity onto the inner tunnel surface of a meso pore molecular sieve carrier, wherein the meso pore molecular sieve carrier contains one or more elements selected from the group consisting of MCM-41, MCM-48, SBA-15, SBA-16, KIT-5 and KIT-6 with the aperture being from 2nm to 50nm; and the active ingredients contain one or more elements selected from the group consisting of Co, Fe, Ni, Mn, Cr, Ti, Cu, Mg, Nb, Ta, Mo, W, Zn, Zr, Ru, Ag, Au, Ru, Rh, Pt, Re, Al, W, Ga, Ge, Sn, Sb and metal oxide thereof. The catalyst with meso pore characteristics can be applied to the catalytic purification of tail gases containing nitrogen oxide. The catalyst provided by the invention has high catalytic activity and is suitable for a plurality of pollutants; in addition, the active ingredients of the catalyst are fixed so as to avoid loss, volatilization and high-temperature sintering.

Description

technical field [0001] The invention relates to a catalyst with mesoporous characteristics and its application in catalytic purification of motor vehicle tail gas and industrial waste gas, belonging to the field of environmental catalysis. technical background [0002] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be divided into three categories according to the size of their pore diameters: materials with pore diameters less than 2 nm are microporous materials; materials with pore diameters in the range of 2-50 nm are mesoporous materials ; A material with a pore diameter greater than 50 nanometers is a macroporous material. Mesoporous materials have ultra-high specific surface area, adjustable pore size, narrow pore size distribution and regular pore structure, which can facilitate the diffusion of reactant molecules, and are considered to be the most potential and ideal carrier materials, which can be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/035B01J29/78B01J29/00B01D53/94B01D53/86B01D53/56B01D53/72B01D53/62B01D53/58
Inventor 张润铎薛君陈标华曹维良
Owner BEIJING UNIV OF CHEM TECH
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