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A kind of catalytic conversion soot particle catalyst cuo/k 2 ti 4 o 9 preparation method

A soot particle and catalytic conversion technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of DPF deactivation, carbon black particle combustion, etc. , to achieve high low-temperature activity, cheap raw materials, and good economic benefits

Active Publication Date: 2021-07-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the exhaust temperature of a diesel engine is generally 150-400°C, and its lower temperature makes it difficult for the carbon black particles in the exhaust to burn, which will lead to DPF deactivation after long-term use

Method used

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  • A kind of catalytic conversion soot particle catalyst cuo/k <sub>2</sub> ti <sub>4</sub> o <sub>9</sub> preparation method
  • A kind of catalytic conversion soot particle catalyst cuo/k <sub>2</sub> ti <sub>4</sub> o <sub>9</sub> preparation method
  • A kind of catalytic conversion soot particle catalyst cuo/k <sub>2</sub> ti <sub>4</sub> o <sub>9</sub> preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A catalytic conversion of soot particle catalyst CuO / K 2 Ti 4 o 9 The preparation method comprises the following steps:

[0028] S1, preparation K 2 Ti 4 o 9 , specifically including the following steps:

[0029] S101. Preparation of potassium acetate solution: Weighing an appropriate amount of potassium acetate and dissolving it in a mixed solution of absolute ethanol and deionized water.

[0030] Wherein, the volume ratio of absolute ethanol and deionized water is 3; the mass ratio of potassium acetate and deionized water is 0.2.

[0031] S102. Prepare tetrabutyl titanate solution: Weigh an appropriate amount of tetrabutyl titanate and dissolve it in an appropriate amount of mixed solution of absolute ethanol, ethylene glycol and acetic acid according to the stoichiometric ratio n=2 (K:Ti=n).

[0032] Wherein, the volume ratio of absolute ethanol, ethylene glycol and acetic acid is 1:1:1; and the mass ratio of tetrabutyl titanate to deionized water is 3.

[00...

Embodiment 2

[0042] A catalytic conversion of soot particle catalyst CuO / K 2 Ti 4 o 9 The preparation method comprises the following steps:

[0043] S201. Weigh a certain amount of copper nitrate according to the stoichiometric ratio and dissolve it in deionized water, stir to make it completely dissolve, and add the K prepared in Example 1 2 Ti 4 o 9 , to obtain a mixture A in which n(CuO / K 2 Ti 4 o 9 ) = 0.5;

[0044] S202, taking out the mixture A after immersing it under ultrasonic conditions of 40 Hz for 1 hour, and stirring it sufficiently at room temperature to volatilize the solvent to obtain a catalyst precursor;

[0045] S202. Dry the catalyst precursor at 80°C, raise the temperature to 400°C at a rate of 5°C / h in air atmosphere, and roast at this temperature for 2.5h to obtain a CuO / K 2 Ti 4 o 9 = 1:2 catalyst.

[0046] A laboratory soot catalytic activity simulation experiment was carried out on the catalyst; wherein, the test conditions were: O2 / N2 (volume fraction) ...

Embodiment 3

[0048] A catalytic conversion of soot particle catalyst CuO / K 2 Ti 4 o 9 The preparation method comprises the following steps:

[0049] S201. Weigh a certain amount of copper nitrate according to the stoichiometric ratio, dissolve it in deionized water, stir to make it completely dissolve, and add the K 2 Ti 4 o 9 , to obtain a mixture A in which n(CuO / K 2 Ti 4 o 9 )=1;

[0050] S202, taking out the mixture A after immersing it under ultrasonic conditions of 40 Hz for 1 hour, and stirring it sufficiently at room temperature to volatilize the solvent to obtain a catalyst precursor;

[0051] S202. Dry the catalyst precursor at 80°C, raise the temperature to 400°C at a rate of 5°C / h in air atmosphere, and roast at this temperature for 2.5h to obtain a CuO / K 2 Ti 4 o 9 = 1:1 catalyst.

[0052] A laboratory soot catalytic activity simulation experiment was carried out on the catalyst; wherein, the test conditions were: O2 / N2 (volume fraction) = 10%, and the total gas fl...

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Abstract

The scheme provided by the invention is: a kind of catalytic conversion soot particle catalyst CuO / K 2 Ti 4 o 9 The preparation method comprises the following steps: using solution impregnation method, K 2 Ti 4 o 9 The catalyst is obtained by immersing in an aqueous solution of copper nitrate, removing the solvent and drying, and calcining at 350-450°C. 1) The method for preparing the catalyst in the present invention is easy to realize industrial production, the raw materials are cheap and easy to obtain, and the cost of the obtained catalyst is much lower than that of noble metal catalysts, with obvious cost advantages and better economic benefits. 2) Compared with the prior art, the beneficial effect of the present invention is: the CuO / K 2 Ti 4 o 9 The catalyst is used as a catalyst for low-temperature combustion of soot and has high low-temperature activity. Ti, Tm and Tf are respectively 277°C-285°C, 369°C-462°C and 434°C-455°C. The CO2 selectivity can reach more than 95%, and the passive combustion can be completely realized within the temperature range of diesel vehicle exhaust.

Description

technical field [0001] The invention relates to the field of automobile exhaust catalysts, in particular to a catalyst and its preparation method and application. Background technique [0002] In recent years, the development momentum of diesel vehicles is very rapid. Compared with gasoline vehicles, diesel vehicles have many advantages of economy, power, and environmental protection, and gradually occupy market share, and are increasingly concerned and favored by everyone. However, the particulate matter (PM, mainly carbon black particles) emitted by diesel engines has seriously endangered the environment and human beings. At the same time, the exhaust emission standards of diesel vehicles are becoming increasingly stringent, which also puts forward higher requirements for diesel vehicle exhaust after-treatment technology. . In the prior art, a particulate filter (DPF) is usually used to collect carbon black particles in diesel vehicle exhaust, and the collected carbon bl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01D49/00F01N3/035
CPCB01D49/00B01D2258/012B01J23/002B01J23/78B01J2523/00F01N3/035B01J2523/13B01J2523/17B01J2523/47
Inventor 杜军何钰张强杨勇何安帮王文路代朝能陶长元
Owner CHONGQING UNIV
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