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Honeycomb ceramic catalyst for simultaneously desulfurizing and denitrifying fume and its preparation and use

A technology of desulfurization and denitration and honeycomb ceramics, which is applied in the field of preparation and application of honeycomb ceramic catalysts for simultaneous desulfurization and denitrification of flue gas. , the effect of high denitrification activity

Inactive Publication Date: 2005-12-21
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The honeycomb catalyst has the advantages of small pressure drop and overcoming dust clogging, and has been widely used in flue gas denitration, but so far there are no reports of honeycomb catalysts for simultaneous desulfurization and denitrification at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 152gAl(NO 3 ) 3 9H 2 Dissolve O in 200ml of distilled water, heat to dissolve and add 80g of urea to obtain the coating solution. Soak the surface-treated ceramics with the above-mentioned coating solution for 8 hours, take them out, dry them at 50°C for 8 hours, dry them at 110°C for 12 hours, and calcinate them at 500°C for 6 hours. The coating was repeated 5 times to obtain a coating carrier with a ceramic content of 81% and an activated alumina content of 19%. Using water as an adsorbent to conduct a blank experiment on the adsorption capacity of the coated ceramic carrier, it was found that 100 grams of the carrier can absorb 36 ml of water. The prepared CuO content is 0.236gCuO / ml, Na 2 O content is 0.11gNa 2 O / ml Cu(NO 3 ) 2 and NaNO 3 The mixed solution was impregnated with the coated film carrier, taken out after standing for 6 hours, dried at 50°C for 8 hours, dried at 110°C for 12 hours, and calcined at 500°C for 6 hours to obtain 8.5 grams of C...

Embodiment 2

[0027] Catalyst preparation method is the same as embodiment 1. Take a Φ21×30mm catalyst and place it in a reaction tube (Φ21mm), control the reaction temperature at 400°C, and the space velocity at 1800h -1 , the flue gas composition is 1800ppmSO 2 , 500ppm NO, 5.4% O 2 , 2.5%H 2 O, equilibrated Ar, with 600ppm NH 3 As a reducing agent, under the operating conditions, the steady-state NO removal rate is 92%, SO 2 The sulfur capacity with conversion greater than 80% is 6.2%.

Embodiment 3

[0029] Catalyst preparation method is the same as embodiment 1. Take a Φ21×30mm catalyst and place it in a reaction tube (Φ21mm), control the reaction temperature at 400°C, and the space velocity at 1500h -1 , the flue gas composition is 2200ppmSO 2 , 550ppm NO, 5.4% O 2 , 2.5%H 2 O, equilibrated Ar, at 550ppm NH 3 As a reducing agent, under the operating conditions, the steady-state NO conversion rate is 90%, SO 2 The sulfur capacity with a conversion rate of 80% is 6.6%.

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Abstract

A honeycomb ceramic catalyst for simultaneous desulfurization and denitration of flue gas is based on surface-treated cordierite honeycomb ceramics as a carrier, coated with an activated alumina membrane, and loaded with active components CuO and Na 2 O, prepared by dipping method. The denitrification rate of atmospheric flue gas is about 88%, and when the desulfurization rate is greater than 80%, the SO adsorbed per gram of catalyst 2 The amount is about 62mg, the bed resistance is small, and it is suitable for industrial application.

Description

Technical field: [0001] The invention belongs to the simultaneous removal of flue gas SO 2 and NO x A honeycomb catalyst and its preparation and application. Background technique: [0002] Since the 1980s, with the rapid development of my country's economy, coal consumption has increased day by day, coal-fired SO 2 And NOx emissions continue to grow, becoming the main pollution source of the atmospheric environment. According to Coal Transformation, 1998, 21(4): 7-11, SO 2 and NOx emissions, causing damage to the ecological environment and serious acid rain. The economic loss caused by acid rain deposition on agriculture, forestry and material damage is as high as more than 20 billion yuan per year. According to my country's sustainable development strategy and "China's 21st Century Agenda", it is necessary to develop flue gas purification technologies suitable for different scales from a long-term perspective and based on national conditions. [0003] Flue gas purific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/60B01D53/86B01D53/94B01J21/04B01J23/78
Inventor 刘振宇刘清雅牛宏贤
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI