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Honeycomb flue gas denitrification catalyst and preparation method thereof

A denitration catalyst, honeycomb technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems affecting the normal operation of thermal power plants, excessive catalyst wear, poor wear resistance, etc. The strength is guaranteed, the defect rate is low, and the effect of improving the high temperature resistance

Active Publication Date: 2015-02-04
河南康宁特环保科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, currently TiO 2 The nitrogen oxide removal catalyst as the core component also has disadvantages such as low mechanical strength, poor wear resistance, and high temperature resistance. The catalyst is prone to excessive wear and pulverization during operation, which will affect the normal operation of thermal power plant units.

Method used

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  • Honeycomb flue gas denitrification catalyst and preparation method thereof
  • Honeycomb flue gas denitrification catalyst and preparation method thereof
  • Honeycomb flue gas denitrification catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A honeycomb flue gas denitrification catalyst, which is formed by extruding and sintering the following raw materials in parts by weight: nano-TiO 2 (1~10μm) 83 parts, nano-SiO 2 (1~10nm) 8.3 parts, ammonium metatungstate and WO 3 10 parts by weight, ammonium metavanadate in V 2 o 5 1 weight, 6.7 parts of glass fiber, 0.42 part of extrusion aid (stearic acid), 0.17 part of carboxymethyl cellulose, 0.25 part of polyethylene oxide, and 0.17 part of squash powder.

[0031] Its preparation method comprises the following steps:

[0032] (1) Weigh nano-TiO 2 , nano-SiO 2 Powder, ammonium metatungstate and ammonium metavanadate, add extrusion aid, add water while stirring to form a paste, and add ammonia water to adjust the pH value of the material to 7.5;

[0033] (2) Add the remaining raw materials and mix evenly, and use a vacuum extruder to extrude a honeycomb embryo body with a cross-section of 150mm×150mm, a number of holes of 15×15, and a length of 1000mm;

[003...

Embodiment 2

[0037] A honeycomb flue gas denitrification catalyst, which is formed by extruding and sintering the following raw materials in parts by weight: nano-TiO 2 (1~10μm) 92.8 parts, nano-SiO 2 (1~10nm) 7.4 parts, ammonium metatungstate and WO 3 7.4 parts by weight, ammonium metavanadate with V 2 o 5 0.8 parts by weight, 9.3 parts of glass fibers, 0.46 parts of extrusion aid (stearic acid), 0.19 parts of carboxymethyl cellulose, 0.28 parts of polyethylene oxide, and 0.19 parts of squash powder.

[0038] Its preparation method comprises the following steps:

[0039] (1) Weigh nano-TiO 2 , nano-SiO 2 Powder, ammonium meta / paratungstate and ammonium metavanadate, add extrusion aid, add water while stirring to form a paste, and add ammonia water to adjust the pH value of the material to 8;

[0040] (2) Add the remaining raw materials and mix evenly, use a vacuum extruder to extrude a honeycomb embryo body with a section of 150mm×150mm, a number of holes of 15×15, and a length of 1...

Embodiment 3

[0044] A honeycomb flue gas denitrification catalyst, which is formed by extruding and sintering the following raw materials in parts by weight: nano-TiO 2 (1~10μm) 68 parts, nano-SiO 2 (1~10nm) 3.4 parts, ammonium paratungstate and WO 3 2.7 parts by weight, ammonium metavanadate in V 2 o 50.48 parts by weight, 3.4 parts of glass fibers, 0.14 parts of extrusion aid (glycerin), 0.14 parts of carboxymethyl cellulose, 0.2 parts of polyethylene oxide, and 0.14 parts of scallop powder.

[0045] Its preparation method comprises the following steps:

[0046] (1) Weigh nano-TiO 2 , nano-SiO 2 Powder, ammonium paratungstate and ammonium metavanadate, add extrusion aid, add water while stirring to form a paste, and add ammonia water to adjust the pH value of the material to 7;

[0047] (2) Add the remaining raw materials and mix evenly, and use a vacuum extruder to extrude a honeycomb embryo body with a cross-section of 150mm×150mm, a number of holes of 20×20, and a length of 1000...

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Abstract

The invention relates to a honeycomb flue gas denitrification catalyst and a preparation method thereof, belonging to the technical field of inorganic new materials. The honeycomb flue gas denitrification catalyst is mainly prepared by carrying out extrusion molding and sintering on the following raw materials in parts by weight: 68-92.8 parts of nano TiO2, 3-10 parts of nano SiO2, 2-10 parts of glass fiber, 0.1-0.5 part of extrusion aid, 0.1-0.2 part of carboxymethyl cellulose, 0.1-0.3 part of polyoxyethylene and 0.1-0.2 part of sesbania powder. The preparation method comprises the following steps: (1) weighing the nano TiO2 and nano SiO2 powder, adding the extrusion aid, adding water while stirring to obtain paste, and adding ammonia water to regulate the pH value to 7-11; (2) adding the rest of raw materials, evenly mixing, and extruding with an extruding machine to obtain a honeycomb blank; (3) drying the blank at 30-70 DEG C under the relative humidity of 20-100% for 7-15 days; and (4) calcining the dried blank at 250-300 DEG C for 8-15 hours, calcining at 380-420 DEG C for 5-10 hours, and calcining at 580-620 DEG C for 8-12 hours to obtain the finished product.

Description

technical field [0001] The invention belongs to the technical field of new inorganic materials, and in particular relates to a honeycomb catalyst for flue gas denitrification, and also relates to a preparation method of the catalyst. Background technique [0002] Nitrogen oxides (NO x ) is the main cause of acid rain and photochemical smog, which seriously endangers the natural environment and human health. my country's thermal power plants are major emitters of nitrogen oxides, accounting for about 50% of the country's total emissions. On September 21, 2011, the Ministry of Environmental Protection issued the "Emission Standards of Air Pollutants for Thermal Power Plants", which uniformly determined the emission concentration limit of nitrogen oxides in China as 100mg / m 3 , the implementation time of new units will start from 2012, and the execution time of old units will start from July 2014. This emission concentration limit requirement is for all regions of the countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38B01D53/86B01D53/56
Inventor 张福顺祁德祥陈江涛
Owner 河南康宁特环保科技股份有限公司
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