Catalyst for low-temperature SCR (Selective Catalytic Reduction) denitration and preparation method of catalyst

A catalyst and denitration technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of expensive catalyst, short service life, high operating temperature, and achieve good catalytic activity, low price, Effects of low ammonia slip rates

Active Publication Date: 2013-06-26
TIANJIN RENDE SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of high operating temperature, high energy consumption, expensive catalyst and short service life of the exis

Method used

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  • Catalyst for low-temperature SCR (Selective Catalytic Reduction) denitration and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Catalyst preparation process

[0034] Weigh 240g of titanium dioxide (grain size 20nm), add 48ml of water, stir and mix at 50°C, after mixing evenly, add 24g of ammonium molybdate, the weight ratio of the amount of ammonium molybdate added to titanium dioxide is 1:10, continue stirring Uniformly, the slurry after mixing was continued to stir at this temperature for 2 hours.

[0035] In the slurry obtained above, add 8 g of ammonium metavanadate under stirring, the weight ratio of ammonium metavanadate addition to titanium dioxide is 1:30, then add iron acetate and copper acetate (mass ratio is about 1:1) composition Add 0.8 g of additives, continue to stir for 2 hours, and then ultrasonically vibrate at a frequency of 15 kHz for 30 minutes.

[0036] The treated slurry was dried in a drying oven for 4 hours, and then calcined at 250° C. for 2 hours at 250° C. for 3 hours in a muffle furnace to obtain a catalyst.

[0037] 2. Catalyst performance test

[0038] The de...

Embodiment 2

[0043] 1. Catalyst preparation process

[0044] Weigh 240g of titanium dioxide (grain size 10nm), add 48ml of water, stir and mix at 70°C, after mixing evenly, add 12g of ammonium molybdate, the weight ratio of ammonium molybdate to titanium dioxide is 1:20, continue stirring Uniformly, the slurry after mixing was continued to stir at this temperature for 2 hours.

[0045] In the slurry obtained above, add 6 g of ammonium metavanadate under stirring, the weight ratio of ammonium metavanadate addition to titanium dioxide is 1:40, then add iron acetate and manganese acetate (mass ratio is about 1:1) composition Auxiliary 4g, continue to stir evenly for 3 hours, then ultrasonically vibrate at a frequency of 20kHz for 20 minutes.

[0046] The treated slurry was dried in a drying oven for 4 hours, and then calcined in a muffle furnace with temperature zones, first at 300° C. for 3 hours, and then heated to 500° C. for 6 hours to obtain a catalyst.

[0047] 2. Catalyst performance...

Embodiment 3

[0052] 1. Catalyst preparation process

[0053]Weigh 240g of titanium dioxide (grain size 30nm), add 48ml of water, stir and mix at 90°C, after mixing evenly, add 8g of ammonium molybdate, the weight ratio of ammonium molybdate to titanium dioxide is 1:30, continue stirring Uniformly, the slurry after mixing was continued to stir at this temperature for 2 hours.

[0054] In the slurry obtained above, add 4 g of ammonium metavanadate under stirring, the weight ratio of ammonium metavanadate addition to titanium dioxide is 1: 60, then add copper acetate and chromium acetate (mass ratio is about 1: 1) composition Auxiliary 8g, continue to stir evenly for 3 hours, then ultrasonically vibrate at a frequency of 10kHz for 40 minutes.

[0055] The treated slurry was dried in a drying oven for 4 hours, and then calcined in a muffle furnace with temperature zones, first at 350° C. for 3 hours, and then heated to 600° C. for 10 hours to obtain a catalyst.

[0056] 2. Catalyst performan...

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Abstract

The invention relates to a catalyst for low-temperature SCR (Selective Catalytic Reduction) denitration. The catalyst is composed of titanium dioxide, vanadium pentoxide, molybdenum trioxide and an assistant, wherein the assistant is one or more of transition metal silicates. The invention further relates to a preparation method of the catalyst. The low-temperature SCR denitration catalyst provided by the invention is excellent in low temperature activity, and is capable of performing the denitration reaction at a low temperature, reducing the reaction energy consumption and lowering the treatment cost. Furthermore, the raw materials of the catalyst provided by the invention are easily available and low in cost, and the preparation process is simple.

Description

technical field [0001] The invention relates to the field of chemical materials, in particular to a catalyst for low-temperature SCR denitrification and a preparation method thereof. Background technique [0002] At present, with the increasingly stringent environmental protection regulations and the general improvement of public environmental protection awareness, the flue gas pollution of boilers has become a prominent environmental protection problem, and nitrogen oxides have become the main gas causing pollution. The environmental quality report in recent years shows that the concentration of nitrogen oxides over my country has been increasing since 2006, and the industrial-intensive area between Beijing and Shanghai has become one of the areas with the most serious nitrogen dioxide pollution in the troposphere in the world. The type of acid rain has changed from sulfuric acid to nitric acid. In the first half of 2010, the incidence of acid rain reached the highest valu...

Claims

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Application Information

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IPC IPC(8): B01J23/887B01J23/889B01J23/86B01D53/86B01D53/56
Inventor 李雪梅杨明久
Owner TIANJIN RENDE SCI
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