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

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

Inactive Publication Date: 2003-11-26
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

[0024] 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

[0026] 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

[0028] 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

The honeycomb ceramic catalyst has surface treated honeycomb iolite ceramic as carrier, coated active alumina film and coated active components CuO and Na2O; and is prepared through soaking process. It has a normal pressure fume denitrifying rate as high as 88 %, desulfurizing rate higher than 80 %, SO2 adsorbing amount of 62 mg each gram of the catalyst and small bed resistance; and 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 NO x Emissions continue to grow and become the main source of pollution of the atmospheric environment. According to Coal Transformation, 1998, 21(4): 7-11, SO 2 and NO x A large amount of discharge, causing damage to the ecological environment, serious acid rain phenomenon. 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 cond...

Claims

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Application Information

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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
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