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Medium-low temperature SCR denitration mesoporous molecular sieve catalyst and preparation method and application method thereof

A technology of mesoporous molecular sieve and application method, which is applied in the field of medium and low temperature SCR denitration mesoporous molecular sieve catalyst, can solve the problem of low medium and low temperature activity, achieve uniform pore size distribution, increase effective active sites, and improve medium and low temperature denitration efficiency. Effect

Inactive Publication Date: 2015-04-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating temperature of the catalyst used in the existing SCR system is generally above 300°C, and the activity at the middle and low temperature is not high. It is urgent to develop an SCR catalyst with higher activity at the middle and low temperature to reduce the operating cost of the denitrification system

Method used

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  • Medium-low temperature SCR denitration mesoporous molecular sieve catalyst and preparation method and application method thereof
  • Medium-low temperature SCR denitration mesoporous molecular sieve catalyst and preparation method and application method thereof
  • Medium-low temperature SCR denitration mesoporous molecular sieve catalyst and preparation method and application method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] Preparation of SBA-15:

[0029] Take 4g P123 (polyoxyethylene-polyoxypropylene-polyoxyethylene), 132.45g distilled water, 20ml hydrochloric acid, dissolve P123 in water, stir magnetically until a uniform solution is formed, add 8.4g ethyl orthosilicate, and stir magnetically for 20 hours Transfer to a hydrothermal kettle and crystallize at 100°C for 24h, cool to room temperature and filter, wash the filtrate with distilled water to neutrality, then wash with absolute ethanol, dry the obtained solid, and finally place it in a muffle furnace at 1 The heating rate of ℃ / min was raised to 550 ℃, and the temperature was kept for 5 hours to obtain the mesoporous molecular sieve SBA-15.

Embodiment 1

[0031] Take a certain amount of copper nitrate (mass fraction of copper element 10%) and dissolve it in absolute ethanol, and uniformly impregnate the above solution on 1 g of the above-mentioned treated SBA-15 carrier. Calcined in a furnace to obtain a Cu / SBA-15 denitration catalyst with a copper content of 10%.

[0032] Get 0.2g of above-mentioned Cu / SBA-15 catalyst packing in the fixed tubular reactor, feed simulated flue gas (1000ppm NO, 1000ppm NH 3 , 5.0%O 2 , N 2 As balance gas), the space speed ratio is 30,000h -1, in the temperature range of 90-240 ℃ to measure the denitrification efficiency of the catalyst, the denitrification efficiency is calculated by the following method:

[0033] α NO = C in - C out C in

[0034] The denitrificati...

Embodiment 2

[0036] The 0.2g Cu / SBA-15 catalyst prepared by embodiment 1 is in the same experimental platform, feeds H in the reactor before use 2 / N 2 (volume ratio of 1:5), activated at 300°C for 1 hour, tested under the same conditions as described in Example 1 after H 2 The denitrification activity of the activated Cu / SBA-15 catalyst (denoted as H 2 -Cu / SBA-15), the denitration efficiency is shown in Table 1.

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Abstract

The invention provides a medium-low temperature SCR denitration mesoporous molecular sieve catalyst and a preparation method and an application method of the medium-low temperature SCR denitration mesoporous molecular sieve catalyst. The catalyst is prepared from active components and a carrier, wherein the active components are one or more of iron, copper and manganese, and the carrier is an SBA-15 silicon dioxide mesoporous molecular sieve and has the characteristics of large specific surface area and uniform pore size distribution. According to the medium-low temperature SCR denitration mesoporous molecular sieve catalyst, the active components can be uniformly dispersed on the surface of the SBA-15, the effective active sites for catalytic reaction can be increased, the denitration efficiency of the catalyst is improved at a medium-low temperature interval of 90 DEG C-240 DEG C, and the catalyst can achieve better denitration effect after H2 reduction activation, and can achieve the denitration efficiency at medium-low temperature up to 80-99%.

Description

technical field [0001] The invention belongs to the technical field of denitrification, and in particular relates to a medium-low temperature SCR denitrification mesoporous molecular sieve catalyst and a preparation and application method thereof. Background technique [0002] Nitrogen oxides (NOx) mainly include NO, NO 2 , N 2 O, etc., are one of the main air pollutants and an important cause of acid rain and photochemical smog. The sources of nitrogen oxides in nature include natural sources and man-made sources, 63% of which come from industrial pollution and traffic pollution, which is twice that of naturally occurring sources. In my country, the coal-based energy structure leads to the flue gas emissions from coal-fired power plants being the main source of man-made nitrogen oxides. In recent years, the emission of nitrogen oxides from coal-fired power plants in my country has been increasing, and the situation of environmental protection has become increasingly seve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03B01D53/90B01D53/56
Inventor 蒋崇文赖素凤蒋泽宇王帅鈡宏
Owner CENT SOUTH UNIV
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