Catalyst used for automobile exhaust particle catalytic filter and preparation method for catalyst

A technology of automobile exhaust and catalyst, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve poor stability, energy waste, heat control of particle traps System complexity and other issues to achieve the effect of improving efficiency

Active Publication Date: 2015-12-30
浙江通源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst regeneration equilibrium point temperature used in existing catalytic oxidation traps is still above 500°C
Due to the high temperature, the heat control system of the particle trap becomes complicated and the stability is poor
Since the heat usually comes from automobile exhaust, fuel combustion or electrical heating, excessive catalytic oxidation temperature will lead to waste of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cordierite pretreatment: completely immerse the cordierite honeycomb ceramics in 4wt% nitric acid solution for 2 hours, rinse with deionized water for 3 times after taking it out, put it in an oven at 120°C, and dry it for 15 hours to obtain Surface activated cordierite honeycomb ceramic support.

[0024] Aluminum sol preparation: 20 grams of pseudoboehmite was added to 150 mL of deionized water, and 7 grams of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 2-5, and age for 24 hours to obtain a transparent aluminum sol with a content of 8wt% as alumina.

[0025] Preparation of the first coating slurry: first mix 150 grams of aluminum sol with 6 grams of fumed silica, add 4 grams of fatty alcohol polyoxyethylene ether (molecular formula is RO(CH 2 CH 2 O) 5 H, where R is C7-C9), after stirring and mixing fo...

Embodiment 2

[0033] The procedure is the same as in Example 1, wherein, in the preparation of the first coating slurry, only 15 g of manganese dioxide is added, and no nickel nitrate is added to obtain product A2.

[0034] Wherein, the mass ratio of each component in terms of oxide is (noble metal: ceria: zirconia: manganese dioxide) = 1:20:17.6:15.

Embodiment 3

[0036] The steps are the same as in Example 1, wherein, in the preparation of the first coating slurry, only 15g of manganese dioxide is added, and no nickel nitrate is added; in the preparation of the second coating slurry, 20 grams of nano-cerium oxide and 20 grams of nano-zirconia are added Product A3 was prepared.

[0037] Wherein, the mass ratio of each component in terms of oxide is (noble metal: ceria: zirconia: manganese dioxide) = 1:20:20:15.

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PUM

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Abstract

The invention discloses a catalyst used for an automobile exhaust particle catalytic filter. The catalyst comprises the following active components: a noble metal element, cerium, zirconium and a transition metal element, wherein the mass ratio of all the components (noble metal: cerium oxide: zirconium oxide: transition metal oxide) is (1 to 10):(20 to 40):(10 to 20):30 by oxide, and the ratio of the cerium to the zirconium is 1:(0.5 to 2). The regeneration balance point temperature of the catalyst used for a particle trap, disclosed by the invention, can be reduced, therefore exhaust gas heat is fully utilized, a heat control system is simplified, and energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of catalyst materials and coating structures, and relates to a catalyst used for catalytic filters of automobile exhaust particles and a preparation method thereof. Background technique [0002] Vehicle exhaust emissions are one of the main sources of air pollution. The pollutants mainly include hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOX), particulate matter (PM) and sulfur dioxide and other harmful substances. These harmful pollutants directly endanger people's physical and mental health and cause serious pollution to the environment. All countries in the world have invested a lot of manpower, material resources and financial resources to control the pollution of vehicle exhaust emissions. They have formulated vehicle exhaust emission standards and are becoming increasingly strict, requiring all motor vehicle exhaust emissions to meet the requirements of the standards. [0003] With the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/656B01J35/04
Inventor 吴忠李映昆石旻磊彭林林
Owner 浙江通源环保科技有限公司
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