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Honeycomb de-nitration catalyst suitable for high-arsenic fume and preparation method of honeycomb de-nitration catalyst

A denitration catalyst and honeycomb technology, which is applied in the field of denitration catalysts, can solve the problems such as the inability to meet the guaranteed value of the chemical life of the SCR denitration catalyst, affecting the normal production and operation of thermal power plants, and catalyst poisoning, so as to facilitate continuous production and improve resistance to arsenic poisoning. Ability, the effect of preventing poison inactivation

Active Publication Date: 2016-12-07
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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  • Honeycomb de-nitration catalyst suitable for high-arsenic fume and preparation method of honeycomb de-nitration catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0028] The preparation method of the above catalyst is as follows:

[0029] (1) Combine 86 parts of titanium dioxide, ammonium heptamolybdate (with MoO 3 Mass basis) 5 parts, ammonium metavanadate (in V 2 O 5 Mass) 1 part, glass fiber (in SiO 2 By mass) 4 parts, 2 parts of hydroxymethyl cellulose 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 moisture content 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) Dry the honeycomb catalyst of...

Embodiment 2

[0037] A honeycomb denitrification catalyst suitable for high arsenic flue gas, the components by weight include: 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 additives, 1.5 parts of monoethanolamine.

[0038] The preparation method of the above catalyst is as follows:

[0039] (1) Mix 79 parts of titanium dioxide, ammonium heptamolybdate (with MoO 3 Mass) 7 parts, ammonium metavanadate (in V 2 O 5 Mass basis) 1.5 parts, silica sol (in SiO 2 By mass) 4 parts, 4 parts of hydroxymethyl cellulose ammonium and polyethylene fiber, 3 parts of natural zeolite, 1.5 parts of monoethanolamine, supplemented by appropriate amount of water, ammonia and lactic acid for 4.5 hours, the moisture content after mixing is 26.54% , PH value is 8.51, ductility is 0.5642;

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

[0041] (3) Dry the honeycomb catalyst of step (2) at 50°C for...

Embodiment 3

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

[0048] The preparation method of the above catalyst is as follows:

[0049] (1) Combine 84 parts of titanium dioxide, ammonium tetramolybdate (with MoO 3 Mass basis) 5 parts, vanadyl sulfate (in V 2 O 5 Mass) 1 part, white carbon black (by SiO 2 By mass) 4 parts, 5 parts of hydroxymethyl cellulose ammonium, polyethylene fiber, polypropylene fiber, 1 part of monoethanolamine, supplemented with appropriate amount of water, ammonia and lactic acid for mixing for 3 hours, the water content after mixing is 27.65%, 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) Dry the honeycomb catalyst of step (2) at 70°C f...

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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 particularly relates to a honeycomb type 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 coal in Northeast, Inner Mongolia and Southwest has high arsenic content, some even as high as 50-60ppm. The high arsenic content directly results in coal-fired flue gas from thermal power plants. Medium As 2 O 3 The content exceeds the standard. Since most of the thermal power plants in my country use the SCR denitration catalyst of the V-W-Ti system, As 2 O 3 Will lead to rapid poisoning and deactivation of the system catalyst. [0003] Under flue gas conditions, As 2 O 3 Dimer As 4 O 6 Exist in the form, it will cover the surface of the denitration catalyst to block the active sites and block the microscopic pores of the catalyst. At the same ti...

Claims

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Application Information

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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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