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Selective urea decomposition catalyst taking honeycomb metal alloy as carrier and preparation method for catalyst

A honeycomb metal and catalyst technology, which is applied in the field of urea selective decomposition catalyst and its preparation, can solve the problems of insufficient low-temperature light-off property, poor temperature stability of catalytic active coating, etc., and achieves good low-temperature light-off property, The effect of good aging resistance

Inactive Publication Date: 2012-09-12
JILIN UNIV
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Problems solved by technology

[0011] The disadvantages of these catalytic converters in the prior art are that their low-temperature ignition properties are not good enough, and the temperature stability of the catalytically active coating is not very good. easy to solve

Method used

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  • Selective urea decomposition catalyst taking honeycomb metal alloy as carrier and preparation method for catalyst
  • Selective urea decomposition catalyst taking honeycomb metal alloy as carrier and preparation method for catalyst
  • Selective urea decomposition catalyst taking honeycomb metal alloy as carrier and preparation method for catalyst

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Embodiment 1

[0040] First prepare the carrier coating sol, mix 3.4kg butyl titanate with 0.92kg absolute ethanol, and stir for 2 hours as A solution; 0.43kg cerium nitrate is added to 0.18kg deionized water, then add 0.29kg pyrophosphoric acid ( 45wt%), then stirred for 2 hours as solution B; while stirring, solution B was added to solution A at a rate of 80ml / min, and then stirred for 2 hours to obtain 5.22kg of uniform and stable carrier coating sol.

[0041] In order to facilitate the better adhesion of the carrier coating to the carrier, the Fe-Cr-Al honeycomb metal alloy carrier (diameter 34cm, height 10cm, mesh number 350 mesh) coated with glass coating was completely immersed in the previously prepared In the carrier coating sol, it was taken out after immersion for 30 minutes and purged with nitrogen gas to make the pores of the carrier unobstructed.

[0042] Subsequently, it was dried in a drying oven at 80° C. for 12 hours, then calcined at 500° C. for 2 hours, and finally the ca...

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Abstract

The invention belongs to the field of purification of NOx in tail gas of diesel engines, and in particular relates to a selective urea decomposition catalyst taking a honeycomb metal alloy as a carrier and a preparation method for the catalyst. The catalyst consists of titanium dioxide, cerium dioxide and a phosphorus-containing compound; the mass / volume ratio of the catalyst to the carrier is 50-150g / L; and the catalyst comprises 5 to 25 mass percent of cerium dioxide, 70 to 90 mass percent of titanium dioxide and 1 to 10 mass percent of phosphorus-containing compound, namely CePO4. The catalyst can be firmly adhered to the metal alloy carrier; the titanium dioxide component in the catalyst has high ageing resistance, and when the temperature is lower than 600DEG C, the anatase crystalline phase cannot be converted to the rutile crystalline phase; and moreover, due to the metal alloy carrier, the active ingredients of the catalyst have low light-off temperature.

Description

technical field [0001] The invention belongs to the field of purification of NOx in diesel engine exhaust, and in particular relates to a urea selective decomposition catalyst with a honeycomb metal alloy as a carrier and a preparation method thereof. The catalyst is composed of titanium dioxide, cerium dioxide and phosphorus-containing compounds. Background technique [0002] With the continuous acceleration of the urbanization process, the number of motor vehicles in my country has increased rapidly, with an average annual growth rate of up to 15%. Among them, diesel vehicles account for an increasing proportion of motor vehicles due to factors such as high work efficiency and good fuel economy. Therefore, NOx emissions from mobile sources will also continue to increase. According to statistics, currently 65% ​​of NOx emitted by mobile sources in my country comes from diesel vehicles. Therefore, the NOx purification treatment of mobile sources represented by diesel vehicle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/188B01J35/04C01C1/08
CPCY02P20/52
Inventor 韩炜李骏韩建张贺张克金张苡铭曹雅彬韩旭周亮林泰哲
Owner JILIN UNIV
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