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A medium and low temperature nh 3 -scr catalyst and its preparation method and application

An NH3-SCR, catalyst technology, applied in the field of flue gas purification, can solve the problem of performance without any data support, and achieve the effects of avoiding raw material waste, good medium and low temperature SCR activity, and high N2 selectivity

Active Publication Date: 2020-12-18
MCC CAPITAL ENGINEERING & RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The catalyst described in this patent only gives the preparation scheme, and does not give any data support for the performance

Method used

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  • A medium and low temperature nh <sub>3</sub> -scr catalyst and its preparation method and application
  • A medium and low temperature nh <sub>3</sub> -scr catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a medium and low temperature NH 3 -The preparation method of SCR catalyst, it comprises the following steps:

[0051] Step (1): Prepare 9.5g of hydrogen-type ZSM-5 molecular sieve carrier with a silicon-aluminum ratio of 25;

[0052] Step (2): Weighing 0.5g of CuCl powder, stirring and mixing with molecular sieve carrier powder to obtain a powder mixture;

[0053] Step (3): The mixed powder obtained in step (2) is made into a compact solid tablet under a pressure of 10 MPa with a tablet machine, and then the solid tablet is crushed and ground into solid particles with a size of 40-60 mesh, and the obtained solid The pellets are loaded into a sealed tube furnace;

[0054] Step (4): Feed N into the tube furnace tube at room temperature 2 Air for 30 minutes to ensure that the air in the furnace tube is completely removed, and then heated to 150 ° C at a rate of 5 ° C per minute and maintained for 10 minutes, in N 2 Introduce NO gas with a conce...

Embodiment 2

[0056] This embodiment provides a medium and low temperature NH 3 -The preparation method of SCR catalyst, it comprises the following steps:

[0057] Step (1): Prepare 9g of hydrogen-type Beta molecular sieve carrier with a silicon-aluminum ratio of 30;

[0058] Step (2): Weigh 0.2g of CuCl powder and 0.2g of FeCl 2 Powder, after grinding, ensure that the particle size is less than 30 μm, stir and mix with molecular sieve carrier powder evenly to obtain a powder mixture;

[0059] Step (3): The mixed powder obtained in step (2) is made into a compact solid tablet under a pressure of 10 MPa with a tablet machine, and then the solid tablet is crushed and ground into solid particles with a size of 40-60 mesh, and the obtained solid The pellets are loaded into a sealed tube furnace;

[0060] Step (4): Feed N into the tube furnace tube at room temperature 2 Air for 30 minutes to ensure that the air in the furnace tube is completely removed, and then heated to 150 ° C at a rate o...

Embodiment 3

[0062] This embodiment provides a medium and low temperature NH 3 -The preparation method of SCR catalyst, it comprises the following steps:

[0063] Step (1): Prepare 9g of ammonia-type Y molecular sieve carrier with a silicon-aluminum ratio of 5.3;

[0064] Step (2): Weigh 0.7g of CuCl powder and 0.8g of FeCl 3 Powder, after grinding, ensure that the particle size is less than 30 μm, stir and mix with molecular sieve carrier powder evenly to obtain a powder mixture;

[0065]Step (3): The mixed powder obtained in step (2) is made into a compact solid tablet under a pressure of 10 MPa with a tablet machine, and then the solid tablet is crushed and ground into solid particles with a size of 40-60 mesh, and the obtained solid The pellets are loaded into a sealed tube furnace;

[0066] Step (4): Feed N into the tube furnace tube at room temperature 2 Air for 30 minutes to ensure that the air in the furnace tube is completely removed, and then heated to 150 ° C at a rate of 5 ...

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Abstract

The invention provides a medium-low temperature NH3-SCR (selective catalytic reduction) catalyst as well as a preparation method and an application of the catalyst. The preparation method comprises steps as follows: 3-15 parts by weight of hydrochloride of Cu and / or hydrochloride powder of Fe are uniformly mixed with 90-95 parts by weight of carrier powder, and a powder mixture is obtained; a compact solid sheet is prepared from the powder mixture, and then the solid sheet is smashed and ground into solid particles; the solid particles are put in a sealed tubular furnace, and nitrogen is introduced to remove air in the furnace; the temperature of the furnace is increased to 120-160 DEG C and the temperature is kept for 10-30 min, NO gas is introduced into nitrogen atmosphere, and meanwhile, the temperature of the furnace is increased to 220-250 DEG C and the temperature is kept for 4-6 h; NO introduction is cut off, the temperature of the furnace is increased to 500-600 DEG C and the temperature is kept for 5-12 h; the temperature is reduced to the room temperature in N2 atmosphere. The obtained catalyst has better medium-low temperature SCR activity, can limit side reactions and has higher N2 selectivity.

Description

technical field [0001] The invention relates to a medium and low temperature NH 3 - The SCR catalyst and its preparation method and application belong to the technical field of flue gas purification. Background technique [0002] In the metallurgical industry, a large number of high-temperature combustion processes are often involved, resulting in a large amount of nitrogen oxides (NOx). In chemical production, oil and gas refining, coal-fired power generation and other fields, flue gas rich in NOx will also be produced. Denitration treatment refers to reducing the generated NOx to N 2 , so as to remove NOx in the flue gas, the world's mainstream denitrification treatment process is divided into: SCR and SNCR. [0003] SCR (Selective Catalytic Reduction) refers to selective catalytic reduction denitrification technology, which is currently the most widely used flue gas denitrification technology in the world, and is basically used in most power plants in Japan, Europe, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/76B01J29/14B01J29/85B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283B01J29/146B01J29/46B01J29/7615B01J29/85B01J2229/18
Inventor 徐瑞年周向张传波任乐
Owner MCC CAPITAL ENGINEERING & RESEARCH