Iolite honeycomb ceramic catalyst for denitrification of flue gas, preparing method and use thereof

A cordierite honeycomb and ceramic catalyst technology, applied in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalysts that are difficult to popularize and apply, have weak physical properties, and are difficult to prepare, and achieve good resistance to SO2 Poisoning performance, low cost, low bed resistance

Inactive Publication Date: 2003-03-12
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

But according to Ind.Eng.Chem.Res.1991, 30 969-978, only the anatase form of TiO 2 It is suitable as the carrier of denitrification catalyst, anatase TiO 2 Difficult to prepare and weak in physical properties
At the same time TiO 2 The price is higher, with TiO 2 Catalysts prepared as carriers are difficult to promote and apply in China

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 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. Take a honeycomb ceramic carrier with a diameter of 21 mm and a length of 60 mm, soak it in the above coating solution for 8 hours, blow off the excess glue in the hole after taking it out, dry it at 50°C for 10 hours, and dry it at 110°C for 12 hours to obtain a coated film carrier. Prepare 2% Cu(NO 3 ) 2 solution, impregnated the coated film carrier, took it out after standing for 10h, dried at 50°C for 8h, dried at 110°C for 12h, and calcined at 450°C for 9h to prepare a catalyst with an active alumina content of 3% and a CuO loading of 1.25wt.%. . Take 30mm of the catalyst and place it in a reaction tube (Φ21mm), at 400°C, 2300ppm SO 2 , 5.4% O 2 , After 12 hours of vulcanization in an atmosphere with Ar as the balance gas, control the reaction temperature at 350°C and the space velocity at 3000h -1 , the flue gas compositio...

Embodiment 2

[0017] The preparation method of the coated film carrier is the same as in Example 1. Prepare 2% Cu(NO 3 ) 2 The solution was impregnated with the coated film carrier, left for 12 hours, taken out, dried at 50°C for 10 hours, dried at 110°C for 12 hours, and calcined at 500°C for 8 hours to obtain a catalyst with an active alumina content of 3% and a CuO loading of 1.25wt.%. Take 30mm of the catalyst and place it in a reaction tube (Φ21mm), at 400°C, 2300ppm SO 2 , 5.4% O 2 , After curing for 12 hours in an atmosphere where Ar is the balance gas, control the reaction temperature at 400°C and the space velocity at 3000 hours -1 , the flue gas composition is 500ppm NO, 5.4%O 2 , 2.5%H 2 O, equilibrated Ar, with 600ppm NH 3 As a reducing agent, the conversion rate of NO is 98% under the operating conditions.

Embodiment 3

[0019] The preparation method of the coated film carrier is the same as in Example 1. Prepare 4% Cu(NO 3 ) 2 The solution was impregnated with the coated film carrier, left for 12 hours, taken out, dried at 50°C for 8 hours, dried at 110°C for 10 hours, and calcined at 400°C for 10 hours to obtain a catalyst with an active alumina content of 3% and a CuO loading of 2.5wt.%. Take 30mm of the catalyst and place it in a reactor (Φ21mm), at 400°C, 2300ppm SO 2 , 5.4% O 2 , After curing for 12 hours in an atmosphere where Ar is the balance gas, control the reaction temperature at 450°C and the space velocity at 3000 hours -1 , the flue gas composition is 500ppm NO, 5.4%O 2 , 2.5%H 2 O, equilibrated Ar, with 600ppm NH 3 As a reducing agent, the conversion rate of NO is 92% under the operating conditions.

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Abstract

A cellular cordierite ceramic catalyst for denitrifying flue gas is composed of cellular cordierite ceramics as the first carrier, the active alumina film (3-5.3 wt.%) as the second carrier and CuO (1.25-15 wt.%) as active component. It is prepared through applying active alumina film on the first carrier, and carrying CuO. Its advantages are low cost, high strength and activity, and high resistance to water and SO2 poisoning.

Description

[0001] Field: [0002] The invention belongs to a method for removing flue gas NO x The preparation and application of the catalyst, in particular to the preparation and application of a low-cost, high-activity cordierite honeycomb ceramic catalyst for flue gas denitrification. Background technique: [0003] 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/86B01J23/72B01J32/00
Inventor 刘振宇刘清雅牛宏贤
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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