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Perovskite fiber boy compound oxide catalyst for treating automobile's waste gas, and method for preparing same

A composite oxide, perovskite-type technology, used in physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of uneven heating, thermal stress damage, and high quality requirements

Inactive Publication Date: 2007-09-19
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The wall-flow honeycomb ceramic catalytic filter (DPF) is currently the most widely used vehicle engine particulate aftertreatment device, but its manufacturing process is complicated, the quality requirements are high, and the heating is uneven during the regeneration process, which is prone to thermal stress damage. Moreover, the properties of the catalyst carrier, the intermediate layer (co-catalyst) and the coating method of the catalyst all have a great influence on the catalytic activity of the catalyst.
Yoshikawa et al. used surface-treated carbon fibers combined with electrostatic capture technology to achieve the capture of PM and the synergistic removal of PM and NOx, but limited to the relatively low thermal stability and oxidation resistance of carbon fibers, this method has been used in practical applications. subject to certain restrictions

Method used

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  • Perovskite fiber boy compound oxide catalyst for treating automobile's waste gas, and method for preparing same
  • Perovskite fiber boy compound oxide catalyst for treating automobile's waste gas, and method for preparing same
  • Perovskite fiber boy compound oxide catalyst for treating automobile's waste gas, and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 2.9g of lanthanum oxide and dissolve it in a solution of 15ml of dilute nitric acid (30%, w / w); then add 6ml of ammonia water to the resulting clear solution to completely precipitate the lanthanum ions into La(OH) 3 Suction filtration, and repeatedly flushing with distilled water to the pH of filtrate is neutral; Gained filter cake is dispersed in the aqueous solution (1.0mol / L) of 30ml citric acid, obtains white emulsion; In gained system, drip ammoniacal liquor, until Clarify, at this time the solution pH ≈ 5.0 ~ 7.5.

[0042] Another weighed 4.5g Co(CH 3 COO) 2 4H 2 O and 3.8 g of citric acid were dissolved in 20 ml of distilled water to obtain a purple-red clear solution. The pre-prepared La citrate complex solution is mixed with it to obtain a precursor solution. The resulting solution is aged in a water bath at 40-80°C for about 4-12 hours to form LaCoO 3 Precursor sol.

[0043] The high-voltage DC power supply with positive voltage output provides a ...

Embodiment 2

[0046] Weigh 2.9g of lanthanum oxide and dissolve it in a solution of 15ml of dilute nitric acid (30%, w / w); then add excess ammonia water to the resulting clear solution to completely precipitate the lanthanum ions into La(OH) 3 Suction filtration, and repeatedly flushing with distilled water until the pH of the filtrate is neutral; Gained filter cake is dispersed in the aqueous solution of 30ml citric acid (1.0mol / L), obtains white emulsion; In the gained system, drip ammoniacal liquor, until clarification , at this time the solution pH ≈ 5.0 ~ 7.5.

[0047] Also called CH 3 COOK(0.2g), Co(CH 3 COO) 2 4H 2 O (4.0 g) and citric acid (3.8 g) were dissolved in 20 ml of distilled water to give a clear purple-red solution. The pre-prepared La citrate complex solution is mixed with it to obtain a precursor solution. The resulting solution was aged in a water bath at 60°C for about 4 to 12 hours to form La 1-X K X CoO 3 Precursor sol.

[0048] The high-voltage DC power sup...

Embodiment 3

[0051] Weigh 2.9g of lanthanum oxide and dissolve it in a solution of 15ml of dilute nitric acid (30%, w / w); then add excess ammonia water to the resulting clear solution to completely precipitate the lanthanum ions into La(OH) 3 Suction filtration, and repeatedly flushing with distilled water until the pH of the filtrate is neutral; Gained filter cake is dispersed in the aqueous solution of 30ml citric acid (1.0mol / L), obtains white emulsion; In the gained system, drip ammoniacal liquor, until clarification , at this time the solution pH ≈ 5.0 ~ 7.5.

[0052] Also called CH 3 COOK(0.5g), Co(CH 3 COO) 2 4H 2 O (3.1 g) and citric acid (3.8 g) were dissolved in 20 ml of distilled water to give a clear purple-red solution. The pre-prepared La citrate complex solution is mixed with it to obtain a precursor solution. The resulting solution was aged in a water bath at 60°C for about 4 to 12 hours to form La 1-X K X CoO 3 Precursor sol.

[0053] The high-voltage DC power sup...

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Abstract

The present invention relates to a perovskite type corpus fibrosum composite oxide catalyst for vehicle tail gas clean-up and the preparation method of the same. The catalyst has the following formula: La1-XKXCoO3, wherein X is within the range of 0.0~0.6. The preparation method comprises the steps of: (1) preparing of precursor sol; (2)electrostatic spinning; and (3)sintering. The catalysis collector is replaced by perovskite type rare earth composite oxide corpus fibrosum, so that the granules contained in the discharged vehicle tail gas can be captured, the PM and NOx can be removed at the same time and the discharge amount of other gaseous contaminant can be reduced.

Description

technical field [0001] The present invention relates to a catalyst for purifying automobile tail gas and its preparation method, and more particularly relates to a perovskite fiber body automobile tail gas purification catalyst and its preparation method. Background technique [0002] Reducing the harmful emissions in automobile exhaust, especially the emission levels of particulate matter (PM) and nitrogen oxides (NOx), is an important technical research hotspot in the world at present. For gaseous pollutants, it is an effective technical measure to convert harmful emissions into harmless substances through the catalysis of catalysts. For solid emissions (PM), it is generally necessary to capture them first, and then remove them by catalytic oxidation. The role of the catalyst is to reduce the oxidation temperature of the particulate matter to the temperature range of the exhaust pipe, so as to realize the continuous regeneration of the particulate trap (CRT). Therefore, ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/06B01D53/94
Inventor 宋崇林龚彩荣范国梁吕刚裴毅强
Owner TIANJIN UNIV
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