Catalyst for purifying asphalt smoke gas and preparation method thereof

A technology of asphalt flue gas and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc. It can solve problems such as troublesome processing, three-way catalysts that cannot meet the requirements, and low utilization rate of precious metals. The effect of high utilization rate, low cost and simple preparation method

Inactive Publication Date: 2008-05-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the working environment of asphalt flue gas is generally at 600-800°C, conventional three-way catalysts cannot meet the requirements
After the ceramic is modified, the modified alumina and precious metal components (such as Chinese patent 02125000.6) are coated at one time. Although the effect is better, the treatment is troublesome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take 80g of modified alumina prepared according to the method in literature [1], add 400mL of 15% polyvinyl alcohol and 600mL of distilled water, and ball mill to make pulp. Soak the cordierite honeycomb ceramics in the slurry, leave it for 6 hours, take it out, blow off the excess slurry with a blower, dry it at 70°C for 6 hours, and then bake it at 500°C for 3 hours to obtain a once-coated ceramic carrier, which is repeated three times.

[0021] Take 1.0 g of dichlorodiammine platinum acid, dissolve it in 500 mL of distilled water, immerse the cordierite honeycomb ceramic coated with modified alumina in the mixed solution, leave it for 6 hours, take it out, blow off the excess slurry with a blower, and Dry at 70°C for 6 hours, and then bake at 500°C for 3 hours to obtain a coating weight of 200g / m 2 , the catalyst with a Pt loading of 3 wt.%. The catalyst is placed in a flue gas purifier, the reaction temperature is controlled at 600° C., and the NO inlet concentrati...

Embodiment 2

[0023] The coating method of modified alumina is the same as that in Example 1. Take 2.0g of dichlorodiammine platinum acid, dissolve it in 500mL of distilled water, immerse the cordierite honeycomb ceramic coated with modified alumina in the mixed solution, leave it for 6 hours, take it out, blow off the excess slurry with a blower, and Dry at 70°C for 6 hours, and then bake at 500°C for 3 hours to obtain a coating weight of 200g / m 2 , the catalyst with a Pt loading of 3 wt.%. The catalyst is placed in a flue gas purifier, the reaction temperature is controlled at 600°C, the NO inlet concentration is 1000ppm, and the conversion rate of NO can reach 70% after passing through the catalyst for 6 hours.

Embodiment 3

[0025] The coating method of modified alumina is the same as that in Example 1. Take 4 mL of palladium nitrate solution containing 15 g / mL, dissolve it in 500 mL of distilled water, immerse the cordierite honeycomb ceramic coated with modified alumina in the mixed solution, let it stand for 6 hours, take it out, blow off the excess slurry with a blower, and Dry at 70°C for 6 hours, and then bake at 500°C for 3 hours to obtain a coating weight of 200g / m 2 , the catalyst with a Pt loading of 3 wt.%. The catalyst is placed in a flue gas purifier, the reaction temperature is controlled at 600°C, and the NO inlet concentration is 1000ppm. After passing through the catalyst for 6 hours, the conversion rate of NO can reach 38%.

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PUM

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Abstract

The invention relates to a pitch fume purification catalyst and a preparation method thereof. The catalyst is characterized in that the catalyst employs precious metal of Pt and Pd as active components which is coated at cordierite honeycomb ceramics after a modified alumina layer is coated at the cordierite honeycomb ceramics. Preparation steps are that: cordierite honeycomb ceramics are soaked in modified slurry which is added with surface active agent, after drying and roasting for 2 to 5 hours, the obtained ceramic support which is coated with a modified alumina layer is soaked in a mixture of Pt and Pd, and the catalyst is obtained after being dried and roasted. The catalyst prepared by the invention is characterized in that: production cost is comparatively low, precious metal is mainly distributed at outer layers, thus utilization ratio is comparatively high, active surface area is large, and the catalyst can work stably at high temperature. The preparation method of the invention is characterized in that: the preparation method is easy, repetitiveness is good, purification treatment of industrial pitch fume and other organic exhaust can be realized after a cushion coat is added and a shell is made into a fume purifier; the catalyst has wide application prospect in oil or gas boilers, industrial kilns and civilian kitchen.

Description

technical field [0001] The invention relates to a catalyst for asphalt flue gas purification and a preparation method thereof. technical background [0002] Asphalt flue gas contains a large amount of hydrocarbons and certain nitrogen, sulfur heterocycles and polycyclic aromatic hydrocarbons. These substances will cause environmental pollution and affect people's health when they are discharged into the air. The treatment of bitumen flue gas generally includes adsorption method, washing method, electrolysis method and catalytic combustion method developed in recent years. Complete Oxidation of Organic Matter in Bitumen Flue Gas to CO Using Catalytic Oxidation Activity of Catalyst 2 , implement lower temperature to avoid NO x , and can run for a long time. Therefore, it is the most economical and efficient. [0003] General flue gas treatment, such as the three-way catalyst used in the purification of automobile exhaust, generally uses metal or honeycomb ceramics as the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J21/18B01J37/025B01D53/44B01D53/86
Inventor 梁莉娟李晋峰
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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