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Exhaust gas cleaning catalyst

A technology of exhaust gas purification and catalyst, which is applied in the direction of catalyst carrier, physical/chemical process catalyst, molecular sieve catalyst, etc. It can solve the problems of unavoidable cost and increase, and achieve the effect of good efficiency and effective utilization

Inactive Publication Date: 2018-12-21
HITACHI ZOSEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In the denitration method using the denitration catalyst described in Patent Document 1, although the problem of ammonium sulfate generation can be eliminated by using alcohol as a reducing agent, the problem of increased cost cannot be avoided because a large amount of reducing agent is required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] A FER-type zeolite (manufactured by TOSOH CORPORATION) having a value (S) of 1528 was used.

[0081] 1.45 g of bismuth nitrate hexahydrate was added to 40 g of ion-exchanged water to prepare a suspension, and the suspension was heated to 80°C. 10 g of the above-mentioned zeolite was immersed in the suspension maintained at this temperature for 15 hours to perform ion exchange. After the ion exchange, it was taken out from the aqueous solution, washed with 440 mL of ion-exchanged water, and dried at 80° C. for 12 hours to obtain the target catalyst.

Embodiment 2

[0083] A catalyst supported by a FER type zeolite (manufactured by TOSOH CORPORATION) having a value (S) of 1766 was prepared. The preparation steps used to prepare the catalyst were the same as in Example 1 except that the zeolite was replaced.

Embodiment 3

[0085] A catalyst supported by a FER type zeolite (manufactured by TOSOH CORPORATION) having a value (S) of 2323 was prepared. The procedure used to prepare the catalyst was the same as in Example 1 except that the zeolite was replaced.

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Abstract

The present invention addresses the objective and problem of providing an exhaust gas cleaning catalyst with which a smaller amount of reducing agent than what was conventionally needed can be used toefficiently remove nitrogen oxides in a relatively low-temperature exhaust gas discharged from a marine diesel engine or the like. Provided is an exhaust gas cleaning catalyst used in a combustion exhaust gas cleaning method for removing, by reducing to nitrogen, nitrogen oxides in the combustion exhaust gas, alcohol being added to the combustion exhaust gas as a reducing agent for reducing the nitrogen oxides, the catalyst being characterized in that the catalyst comprises a carrier and a denitration catalyst metal carried on the carrier, and the carrier is a zeolite having a value (S) of 1500 to 3500, the value (S) being obtained by dividing, by a measurement carrier weight (W), a peak surface area (A) of an Al-OH spectrum measured with a Fourier transform infrared (FT-IR) spectroscopydevice.

Description

technical field [0001] The present invention relates to a catalyst for exhaust gas purification, which is used for removing nitrogen oxides ( NOx). Background technique [0002] Various internal combustion engines are driven by fuels of natural origin such as petroleum, and since such fuels contain trace amounts of nitrogen compounds, combustion exhaust gases generated by burning these fuels contain trace amounts of nitrogen oxides. Since nitrogen oxides present in such combustion exhaust gas are harmful, they must be removed before being released into the atmosphere. As one of the methods for removing nitrogen oxides, the mainstream ammonia selective catalyst reduction method is known. . The ammonia selective catalyst reduction method is a method in which a denitration catalyst mainly composed of vanadium and titanium dioxide is used as a catalyst, and ammonia is used as a reducing agent. [0003] Among various internal combustion engines, C-heavy oil and the like are bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/69B01D53/94F01N3/08F01N3/10
CPCB01D53/94F01N3/08F01N3/10B01J29/69F01N3/2066F01N2610/03F01N2590/02F01N2370/04Y02C20/10Y02T10/12B01D53/9427B01D2255/50F01N2610/00B01D53/9413B01D2255/2096B01J35/04F01N3/206F01N3/2828F01N2330/06F01N2510/063
Inventor 吉田谕史日数谷进庄野惠美
Owner HITACHI ZOSEN CORP
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