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NOX reduction catalyst

A denitration catalyst and catalyst technology, applied in the field of denitration catalysts, can solve the problems of deactivation of the reaction active point of the denitration catalyst, the removal of the denitration catalyst, and the reduction of the efficiency of denitration, and achieve stress reduction, excellent wear resistance, and denitration efficiency. Reduce the effect of inhibition

Pending Publication Date: 2021-10-15
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sometimes the denitrification catalyst is chipped and worn out due to the coal dust contained in the exhaust gas
In addition, the alkali components contained in the coal dust may deactivate the reactive sites of the denitration catalyst.
As a result, the efficiency of denitrification gradually decreases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Molybdenum trioxide, ammonium metavanadate, and silica sol were added to titanium oxide powder, and aluminum compound powder and aluminosilicate fibers were further added, and kneaded while adjusting the water content to obtain a catalyst paste. The amount of moisture is adjusted so that microcracks are uniformly formed. This is coated on an expanded metal, followed by press processing to obtain a flat plate-shaped molded product. This molded product was dried at 120° C. for 1 hour. Next, it was placed in a firing furnace, and the temperature was raised from room temperature to 500° C. over 2 hours, maintained at 500° C. for 2 hours, and then cooled to room temperature over 2 hours to obtain a molded body. Each observation image in 10 randomly selected regions of the surface of the obtained compact is shown in figure 1 middle.

[0080] The microcracks spread in a network on the surface of the molded body in any region. 95% crack width B of microcracks 95 The averag...

Embodiment 2

[0083] Dry the molded product at 30°C for 12 hours, then place it in a firing furnace, raise the temperature from room temperature to 500°C over 12 hours, maintain it at 500°C for 2 hours, and then cool it to room temperature over 12 hours. Except for this, a denitration catalyst was obtained by the same method as in Example 1. Each observation image in 10 randomly selected regions of the surface of the obtained compact is shown in image 3 middle.

[0084] The microcracks spread in a network on the surface of the molded body in any region. 95% crack width B of microcracks 95 The average value of the crack area ratio was 30 μm, 3.19%, and the coefficient of variation of the crack area ratio was 0.21. This molded body was used as a denitration catalyst. In addition, the wear relative decrement is 0.30.

Embodiment 3

[0086]A denitration catalyst was obtained by the same method as in Example 1 except that the water content, drying conditions, and firing conditions were changed. Each observation image in 10 randomly selected regions of the surface of the obtained compact is shown in Figure 5 middle.

[0087] Microcracks propagate in any region in the shape of a double-sided comb on the surface of the shaped body. 95% crack width B of microcracks 95 The average value of the crack area ratio was 90 μm, 12.27%, and the coefficient of variation of the crack area ratio was 0.08. This molded body was used as a denitration catalyst. In addition, the wear relative reduction was 0.34.

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Abstract

A NOx reduction catalyst which is composed of a molded body that contains a catalyst component, while having microcracks that extend in the shape of a network or a double-sided comb on the surface of the molded body, and which is configured such that: the microcracks have a 95% crack width of 100 (mu)m or less; the variation coefficient of the crack area ratio is 0.7 or less; and the average of the crack area ratio is preferably 1-14%. A method for removing nitrogen oxides from a combustion exhaust gas, which comprises a step for processing a combustion exhaust gas containing nitrogen oxides in the presence of the above-described NOx reduction catalyst.

Description

technical field [0001] The invention relates to a denitrification catalyst. More specifically, the present invention relates to a denitration catalyst excellent in attrition resistance. Background technique [0002] As a method for removing nitrogen oxides (NOx) in exhaust fumes emitted from power plants, various factories, automobiles, etc., known methods based on the use of ammonia (NH 3 ) and other reducing agents such as selective contact reduction of exhaust gas denitrification method. Titanium oxide (TiO 2 )-based catalysts, zeolite-based catalysts, etc. As the shape of the catalyst, honeycomb shape, plate shape and the like are known. [0003] Exhaust gas from coal-fired boilers sometimes contains a large amount of coal dust. Sometimes the denitrification catalyst is chipped off and worn out due to the coal dust contained in the exhaust gas. In addition, the alkali component etc. contained in coal dust may deactivate the reaction active site of a denitration cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01D53/86B01D53/94B01J23/28
CPCB01J23/28B01D2258/0283B01D2255/50B01D2255/20707B01D2255/20776B01D2255/20761B01D2255/20738B01D2255/20723B01D2255/20769B01D2251/2062B01D2255/30B01D2255/92B01D53/8625B01J35/002B01J37/08B01J37/082B01J23/002B01J2523/00B01J2523/31B01J2523/41B01J2523/47B01J2523/55B01J2523/68B01J35/1004B01D53/8628B01D53/9413B01D2255/2092B01J35/02F23J15/02F23J2215/10
Inventor 清泽正志兼田慎平甲斐启一郎横山公一
Owner MITSUBISHI HEAVY IND LTD
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