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Three-element compound metallic oxide catalyst and its preparation method

A noble metal oxide and ternary composite technology, applied in chemical instruments and methods, separation methods, dispersion particle separation, etc., can solve problems such as unreachable and lower catalyst light-off temperature, achieve low light-off temperature, high temperature aging resistance The effect of good performance and wide selection range of precious metal components

Inactive Publication Date: 2009-12-02
北京绿创环保设备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with the emergence of the European Automobile Exhaust Emission No. III standard, the international requirements for automobile exhaust emission indicators are becoming more and more stringent. In order to meet the requirements of the No. III standard, it is necessary to achieve effective control of automobile cold start emissions. This requires that the existing automotive emission purification catalytic devices, including the above-mentioned existing invention patent ZL97120101. time, prolong the service life, otherwise it will not be able to meet the requirements of the European automobile exhaust emission standard III

Method used

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  • Three-element compound metallic oxide catalyst and its preparation method
  • Three-element compound metallic oxide catalyst and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1: Preparation of ternary composite metal oxide catalyst.

[0031] Such as Picture 1-1 , 2, take 100 grams of titanium dioxide and 61 grams of calcium nitrate, dissolve them in water, impregnate the aqueous solution of calcium nitrate on the titanium dioxide, evaporate to dryness, then dry at 120 ° C for 5 hours, and roast at 600 ° C for 3 to 5 hours to control the average particle size of the powder. diameter of 4um to obtain inner-coated metal oxide particles 3 . Such as figure 1 As shown in -4, take 200 grams of ferric nitrate and 200 grams of nickel nitrate, dissolve them in water, and the mass ratio of oxides is Fe 2 o 3 :NiO=1:1.3. Dissolve ammonium carbonate in water to make 0.2 mole (NH 4 ) 2 CO 3 Solution; 100 grams of prepared inner coating metal oxide particles 3 are added to iron, nickel nitrate mixed aqueous solution 4, and 0.2 moles (NH 4 ) 2 CO 3 solution, add ammonia water dropwise at pH=7, adjust pH=10, let it stand for 1-2 hours, the...

Embodiment 2

[0038] Example 2: Preparation of ternary composite metal oxide catalyst.

[0039] The preparation and coating method of the catalyst inner coating glue solution 12 are the same as those in Example 1.

[0040] The making of palladium-containing outer coating particulate catalyst 10: get 100 grams of cerium, zirconium outer coating metal oxide particles 8, put into and stir in the aqueous solution 9 that is dissolved by 10.71 grams of palladium chloride, drip into with 1 mole of sodium carbonate When the pH value = 10, let stand for 1-2 hours, filter, wash with deionized water, then dry at 120°C for 5-6 hours, and roast at 500°C for 3 hours, and control the crushing average particle size to ≤5um to obtain a palladium-containing outer The coated particulate catalyst 10 contains 6% palladium.

[0041] The preparation method of rhodium-containing outer coating particulate catalyst 10 is the same as in Example 1.

[0042] Preparation of catalyst outer coating glue solution 14: tak...

Embodiment 3

[0043] Example 3: Preparation of ternary composite metal oxide catalyst.

[0044] The preparation and coating method of the catalyst inner coating glue solution 12 are the same as those in Example 1.

[0045] The making of platinum-containing outer coating particulate catalyst 10: get 100 grams of cerium and zirconium outer coating metal oxide particles 8, quantitatively impregnate them with 3% chloroplatinic acid solution 9, and dry them at 120° C. for 5 hours after each impregnation. Then roast at 200°C for 1 hour, and roast at 400°C for 3 hours. After crushing, impregnate again, dry, roast, and crush until the solution dissolved by 17.36 grams of chloroplatinic acid is used up, then dry at 120°C for 2 hours, and then dry at 200°C. Calcined for 1 hour, 400° C. for 1 hour, and 600° C. for 3 hours to prepare an outer-coated particulate catalyst 10 with a platinum content of 6%.

[0046] The preparation method of rhodium-containing outer coating particulate catalyst 10 is the ...

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Abstract

The invention relates to a ternary composite metal oxide catalyst and a preparation method thereof. The ternary composite metal oxide catalyst is composed of a porous honeycomb ceramic matrix and inner and outer coatings of the catalyst coated on the ceramic matrix. The composition of the inner coating includes metal oxide particles and modified γ-Al2O3; the composition of the outer coating includes precious metals platinum, rhodium and palladium and metal oxide particles and modified γ-Al2O3; the composition of modified γ-Al2O3 is composed of γ-Al2O3 , barium dioxide, ceria, lanthanum trioxide and zirconium dioxide. The ternary composite metal oxide catalyst prepared by the invention has an enlarged selection range of precious metal components, low light-off temperature, good anti-aging performance at high temperature, long anti-aging time, high environmental protection purification rate, and all technical indicators have reached the European automobile level. The exhaust emission standard III is applicable to the purification of automobile exhaust emission pollution of various unleaded gasoline closed-loop control EFI engines.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a ternary composite metal oxide catalyst and a preparation method thereof for purifying automobile exhaust emissions. Background technique [0002] Vehicle emissions are one of the main sources of air pollution, and it has become the consensus of the international community to take strict measures to minimize vehicle emissions. The three-way catalytic converter combined with the closed-loop control EFI engine is the mainstream technology for controlling vehicle emission pollution. This technology can reduce the harmful gases CO, HC, NO X significantly reduced. [0003] At present, there have been many research patents on ternary composite metal oxide catalysts for automobile emission purification, especially the inventor's invention patent ZL97120101.3. The patent uses honeycomb ceramics as the carrier, and γ-Al is attached to the surface of the carrier hole wall ...

Claims

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Application Information

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IPC IPC(8): B01J23/56B01J23/89B01D53/94
Inventor 姜鹏明赵国明吴帮玉
Owner 北京绿创环保设备股份有限公司
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