Catalyst for purifying exhaust gas of natural gas engine and preparation method thereof

A technology of exhaust purification and catalyst, which is applied in the field of natural gas engine exhaust purification catalyst and its preparation, can solve the problems of poor catalytic effect and high light-off temperature, and achieve the effects of improving stability, high catalytic activity and reducing the amount of precious metals

Inactive Publication Date: 2011-05-04
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This catalyst can better remove HC, NO x and CO, but the light-off temperature for

Method used

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  • Catalyst for purifying exhaust gas of natural gas engine and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A cordierite honeycomb ceramic carrier with a diameter of 76.2mm and a height of 50mm (volume 0.228L) and a pore density of 400cpsi was placed in a 110°C drying oven to dry, and then purged. Weigh 300g of deionized water, add 124g of γ-Al to the aqueous solution 2 o 3 , 30g lanthanum yttrium modified cerium zirconium solid solution, 10g lanthanum oxide, 10g praseodymium oxide, 14g manganese oxide, 6g barium oxide, 6g aluminum glue, stirred at room temperature, while adjusting the pH value to 4, to prepare coating slurry. Then it was uploaded on an automatic coating machine, the excess slurry was purged with air, dried at 110°C for 8 hours, and calcined at 650°C for 4 hours.

[0033] Weigh 0.46gPd(NO 3 ) 2 (measured as Pd), 0.024gPt(NO 3 ) 2(Measured by Pt), add 80 g of deionized water to make active component solution. The active component is impregnated on the coated carrier by equal-volume impregnation method, dried at 110°C for 8 hours, and calcined at 650°C fo...

Embodiment 2

[0035] The preparation method is the same as in Example 1, except that 14g of manganese oxide is replaced by MnO with a manganese / cobalt molar ratio of 4:1 x -CoO x manganese-cobalt transition metal composite oxide to obtain catalyst 2# of the present invention.

Embodiment 3

[0037] The preparation method is the same as in Example 1, except that 14g of manganese oxide is replaced by FeO with an iron / cobalt molar ratio of 4:1 x -CoO x Iron-cobalt transition metal composite oxide to obtain catalyst 3# of the present invention.

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Abstract

The invention discloses a catalyst for purifying exhaust gas of a natural gas engine and a preparation method thereof. The catalyst consists of a carrier, a coating coated on the carrier and catalytic active components loaded on the coating, wherein the carrier of the catalyst is made of a honeycomb cordierite ceramic material, the coating is a mixture of activated alumina, a ceria-zirconia solid solution, a rare-earth oxide, an alkaline-earth metal oxide and a caking agent, and the catalytic active components include a platinum group metal and at least one transition metal composite oxide or one transition metal-rare earth composite oxide. Since the transition metal composite oxide or the transition metal-rare earth composite oxide has high oxidative activity for hydrocarbon, and the rare-earth and alkaline-earth metal oxide in the coating has good stabilization effect on the coating and the active components, therefore, the catalyst disclosed by the invention has high catalytic activity and stability for hydrocarbon compounds, the dosage of precious metal is greatly reduced, and the cost of the catalyst is lowered. Moreover, the catalyst can be used for purifying the exhaust gas of the natural gas engine, and besides, the catalyst can be also used for purifying the exhaust gas of automotive vehicles which take gasoline or liquefied petroleum gas as fuel.

Description

technical field [0001] The invention relates to a natural gas engine exhaust purification catalyst and a preparation method thereof. Background technique [0002] In the past 20 years, the environmental pollution of major cities in the world has become more and more serious, and most of the main pollution sources come from the exhaust emissions of automobiles. Therefore, it is necessary to effectively control the exhaust emissions of automobiles. At present, the most effective treatment method is catalytic purification of automobile exhaust. The basic principle is to convert carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO) in automobile exhaust x ) and other harmful components are oxidized and reduced to carbon dioxide (CO 2 ), nitrogen (N 2 ) and water vapor (H 2 o). At the same time, with the increasing number of automobiles, the demand for oil has increased significantly, making the original shortage of oil resources more severe, and the development of...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/04B01D53/94B01D53/62B01D53/56B01D53/72
Inventor 卢冠忠朱增赞周坚刚张蓓郭耘郭杨龙张志刚
Owner EAST CHINA UNIV OF SCI & TECH
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