A honeycomb denitrification catalyst suitable for high arsenic flue gas and its preparation method

A denitration catalyst and catalyst technology, applied in the field of denitration catalysts, can solve the problems of failing to meet the guaranteed chemical life value of SCR denitration catalyst, affecting the normal production and operation of thermal power plants, catalyst poisoning, etc., achieving easy continuous production and improving arsenic poisoning resistance. , The effect of preventing poisoning and inactivation

Active Publication Date: 2019-03-29
CHONGQING YUANDA CATALYST MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simultaneous physical and chemical processes mentioned above will quickly poison the catalyst, and the activity will decline sharply, which cannot meet the guaranteed chemical life of conventional SCR denitrification catalysts of 16000-24000h, seriously affecting the normal production and operation of thermal power plants

Method used

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  • A honeycomb denitrification catalyst suitable for high arsenic flue gas and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A honeycomb type denitrification catalyst suitable for high arsenic flue gas, when feeding, the components include by weight: TiO 2 86 copies, MoO 3 5 parts, V 2 o 5 1 part, SiO 2 4 parts, 2 parts of organic additives, 1 part of inorganic structural aids, 1 part of monoethanolamine.

[0028] Above-mentioned catalyst preparation method is as follows:

[0029] (1) 86 parts of titanium dioxide, ammonium heptamolybdate (using MoO 3 by mass) 5 parts, ammonium metavanadate (in V 2 o 5 mass) 1 part, glass fiber (as SiO 2 4 parts by mass), 2 parts of hydroxymethylcellulose ammonium and polyethylene fiber, 1 part of USY molecular sieve (Si / Al=25-100), 1 part of monoethanolamine, supplemented with appropriate amount of water, ammonia and lactic acid After mixing for 4 hours, the water content after mixing is 28.67%, the pH value is 8.76, and the ductility is 0.4987;

[0030] (2) extruding the material of step (1) to obtain an 18-hole honeycomb catalyst;

[0031] (3) ...

Embodiment 2

[0037] A honeycomb type denitrification catalyst suitable for high arsenic flue gas, when feeding, the components include by weight: TiO 2 79 copies, MoO 3 7 copies, V 2 o 5 1.5 parts, SiO 2 4 parts, 4 parts of organic additives, 3 parts of inorganic structural aids, 1.5 parts of monoethanolamine.

[0038] Above-mentioned catalyst preparation method is as follows:

[0039] (1) 79 parts of titanium dioxide, ammonium heptamolybdate (using MoO 3 mass) 7 parts, ammonium metavanadate (in V 2 o 5 mass) 1.5 parts, silica sol (as SiO 2 4 parts by mass), 4 parts in total of hydroxymethylcellulose ammonium and polyethylene fiber, 3 parts of natural zeolite, 1.5 parts of monoethanolamine, mixed with appropriate amount of water, ammonia and lactic acid for 4.5 hours, and the water after mixing is 26.54% , the pH value is 8.51, and the ductility is 0.5642;

[0040] (2) extruding the material of step (1) to obtain an 18-hole honeycomb catalyst;

[0041] (3) drying the honeycomb...

Embodiment 3

[0047] A honeycomb type denitrification catalyst suitable for high arsenic flue gas, when feeding, the components include by weight: TiO 2 84 copies, MoO 3 5 parts, V 2 o 5 1 part, SiO 2 4 parts, 5 parts of organic additives, 0 parts of inorganic structural aids, 1 part of monoethanolamine.

[0048] Above-mentioned catalyst preparation method is as follows:

[0049] (1) 84 parts of titanium dioxide, ammonium tetramolybdate (using MoO 3 Mass) 5 parts, vanadyl sulfate (in V 2 o 5 by mass) 1 part, white carbon black (as SiO 2 4 parts by mass), 5 parts in total of hydroxymethylcellulose ammonium, polyethylene fiber, and polypropylene fiber, 1 part of monoethanolamine, mixed with an appropriate amount of water, ammonia and lactic acid for 3 hours, the water after mixing is 27.65%, and the pH The value is 8.61, and the ductility is 0.5348;

[0050] (2) extruding the material of step (1) to obtain an 18-hole honeycomb catalyst;

[0051] (3) drying the honeycomb catalyst ...

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Abstract

The invention discloses a honeycomb de-nitration catalyst suitable for high-arsenic fume and a preparation method of the honeycomb de-nitration catalyst. The catalyst is a V2O5-MoO3-TiO2 system catalyst, and the catalyst comprises the following components in parts by weight: 77-96 parts of TiO2, 1.5-10 parts of MoO3, 0.15-3 parts of V2O5, and 2-10 parts of SiO2. The invention discloses a preparation method of the catalyst. According to the honeycomb de-nitration catalyst disclosed by the invention, molybdenum is added to a conventional V-Ti system catalyst, an organic additive is changed, and an inorganic additive is added, so that a hole structure is enriched, and the arsenic poisoning resistance of the de-nitration catalyst is improved. The molybdenum can react with vanadium in the catalyst to generate a metal complex, so that the vanadium can be protected, and the vanadium is prevented from generating vanadium arsenate and poisoning deactivation; and the rich hole structure of the catalyst enables the catalytic reaction to have an enough place, and besides, the speed that As2O3 blocks ducts can be decelerated.

Description

technical field [0001] The invention belongs to the field of denitration catalysts, and in particular relates to a honeycomb denitration catalyst suitable for high-arsenic flue gas and a preparation method thereof. Background technique [0002] The quality of coal used in various regions of my country varies greatly. For example, the arsenic content in coal in Northeast China, Inner Mongolia and Southwest China is relatively high, some even as high as 50-60ppm. Middle As 2 o 3 The content exceeds the standard. Since most thermal power plants in my country use SCR denitrification catalysts of the V-W-Ti system, As 2 o 3 It will lead to rapid poisoning and deactivation of the catalyst in this system. [0003] Under flue gas conditions, As 2 o 3 dimer As 4 o 6 form, which will cover the surface of the denitration catalyst to cover the active sites and block the microscopic pores of the catalyst, while As 2 o 3 will match the V in the catalyst 2 o 5 The reaction gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/28B01J29/48B01J29/03B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01D2255/40B01D2255/50B01D2255/504B01D2258/0283B01J23/002B01J23/28B01J29/0341B01J29/48B01J2523/00B01J2523/41B01J2523/47B01J2523/55B01J2523/68
Inventor 黄锐刘红辉平原席文昌周林成丹刘伟解晓斌刘强张河坤杨欢
Owner CHONGQING YUANDA CATALYST MFG
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