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Catalyst for removing nitrogen oxide in emission exhaust and preparation method thereof

A technology of nitrogen oxides and oxides, applied in the field of catalysts and preparations for removing nitrogen oxides in exhaust gas, can solve problems such as poor sulfur resistance, loss of redox ability, and loss of cerium-based materials, and achieve low price , the source of raw materials is convenient, the effect of simple preparation process

Inactive Publication Date: 2013-09-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Cerium oxides or composite oxides are used as oxygen storage materials due to their excellent redox properties, but their sulfur resistance is poor, and SO in the reaction atmosphere 2 It reacts with cerium oxide to form cerium sulfate to lose its redox ability
Coal-fired power plant flue gas contains 400-1300ppm SO 2 , such a high concentration of SO 2 will quickly render cerium-based materials useless

Method used

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  • Catalyst for removing nitrogen oxide in emission exhaust and preparation method thereof
  • Catalyst for removing nitrogen oxide in emission exhaust and preparation method thereof
  • Catalyst for removing nitrogen oxide in emission exhaust and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Commercial metatitanic acid was calcined at 500°C for 4 hours to obtain titanium dioxide. The average particle size was measured by a laser particle size analyzer to be 1.6 μm, and the specific surface area was 70 m by BET analysis. 2 / g. Mix 882g of the above-mentioned titanium dioxide, 56g of cerium-zirconium composite oxide powder with a cerium-zirconium molar ratio of 4:1 prepared by homogeneous precipitation method, and 97.7g of ammonium paratungstate, and then add it into the kneader. Take 50mL of 25% ammonia water and 300mL of deionized water to make a solution, add it into the kneader and start kneading. 54.5 g of kaolin, 23 g of methylcellulose, 32.5 g of glass fiber and 25 g of glycerin were also added during the kneading process. Knead for a period of time until the material is uniform and the water content is appropriate to obtain catalyst sludge. After the catalyst mud is stale for 24 to 48 hours, vacuum mud refining is started. After the drilled mud is ...

Embodiment 2

[0046] Commercial metatitanic acid was calcined at 500°C for 4 hours to obtain titanium dioxide. The average particle size was measured by a laser particle size analyzer to be 1.6 μm, and the specific surface area was 70 m by BET analysis. 2 / g. Mix 882g of the above-mentioned titanium dioxide, 112g of cerium-zirconium composite oxide powder with a cerium-zirconium molar ratio of 4:1 prepared by homogeneous precipitation method, and 97.7g of ammonium paratungstate, and then add them into the kneader. Get 50mL of 25% ammonia water and 300mL of deionized water to make a solution, add it into the kneader and start kneading. 54.5 g of kaolin, 23 g of methylcellulose, 32.5 g of glass fiber and 25 g of glycerin were also added during the kneading process. Knead for a period of time until the material is uniform and the water content is appropriate to obtain catalyst sludge. After the catalyst mud is stale for 24 to 48 hours, vacuum mud refining is started. After the drilled mud i...

Embodiment 3

[0050] Commercial metatitanic acid was calcined at 500°C for 4 hours to obtain titanium dioxide. The average particle size was measured by a laser particle size analyzer to be 1.6 μm, and the specific surface area was 70 m by BET analysis. 2 / g. Mix 792g of the above-mentioned titanium dioxide, 90g of cerium oxide powder prepared by the solution combustion synthesis method, and 97.7g of ammonium paratungstate and add them into the kneader. Take 50mL of 25% ammonia water and 300mL of deionized water to make a solution, add it into the kneader and start kneading. 54.5 g of kaolin, 23 g of methylcellulose, 32.5 g of glass fiber and 25 g of glycerin were also added during the kneading process. Knead for a period of time until the material is uniform and the water content is appropriate to obtain catalyst sludge. After the catalyst mud is stale for 24 to 48 hours, vacuum mud refining is started. After the drilled mud is placed for 24 hours, it is extruded by a hydraulic piston e...

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Abstract

The invention provides a catalyst for removing nitrogen oxide in emission exhaust and a preparation method thereof. The catalyst comprises a first component oxide, a second component oxide, a third component oxide and a molding auxiliary. The preparation method comprises the following steps of: burdening and mixing, kneading, pugging, extruding, drying and roasting. The catalyst provided by the invention can be used as a reducing agent for ammonia gas so as to selectively catalyze and reduce the nitrogen oxide discharged from a coal-fired power plant.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a catalyst for removing nitrogen oxides in exhaust gas and a preparation method thereof. Background technique [0002] In the process of thermal power generation, fossil fuel combustion emits a large amount of NO x , causing serious environmental pollution. Among various nitrogen oxide removal methods, selective catalytic reduction (selective catalytic reduction, SCR) technology is used to remove NO from various exhaust gases. x One of the most important and most industrially applicable methods. The method is under the action of catalyst, with NH 3 NO x Revert to N 2 into the atmosphere again. [0003] The currently widely used catalyst is V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 catalyst. In order to achieve a certain denitrification activity, the vanadium content is between 0.8% and 2%. [0004] The research on vanadium-based catalysts for SCR denitrif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J23/28B01J35/04B01D53/86B01D53/56
Inventor 王树东程昊彭家喜张朋李德意王淑娟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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