Nano alloy modified cerium oxide powder applied to soot combustion reaction, and preparation method thereof

A nano-alloy and soot combustion technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc. Expensive, raw material cost constraints and other issues, to achieve the effect of maintaining surface oxygen transfer efficiency, simple preparation method, and reducing the maximum weight loss temperature

Active Publication Date: 2014-02-05
XIAMEN XINPUCHUANG PHOTOELECTRIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soot combustion catalysts with platinum group noble metals as the main catalyst have the advantages of catalytic oxidation efficiency (including four-way catalytic activity) and low-temperature light-off, so they are often used in the design of practical soot combustion catalyst systems, such as Chinese patent CN102240544A And CN102794175A disclosed precious metal type catalyst, yet, because precious metal is expensive and resource is scarce, so this type catalyst is subjected to the severe restriction of raw material cost in commercialization process
Practical catalytic systems usually use the assistance of active supports to increase the reaction accessible area of ​​noble metal components. However, due to the limitation of the intrinsic oxygen reduction characteristics of noble metals, the conversion frequency of single reaction sites still does not improve in this improved way.

Method used

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  • Nano alloy modified cerium oxide powder applied to soot combustion reaction, and preparation method thereof
  • Nano alloy modified cerium oxide powder applied to soot combustion reaction, and preparation method thereof

Examples

Experimental program
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Effect test

example 2

[0027] Mix the commercially available nanometer ceria powder and soot particles according to the mass ratio of 5:1, stir evenly with a medicine spoon, put it into the test crucible of TG-209 thermogravimetric analyzer, under air atmosphere (air flow rate is 20ml / min) from 30°C to 800°C at a rate of 10°C / min. Convert the resulting weight loss curves to conversion curves (see figure 1 ), T 10 , T 50 and T 90 The temperatures were 553°C, 616°C and 640°C, respectively.

[0028] Reference example 3

[0029] Weigh 100ml of a mixed solution of 0.1M cerium nitrate and zirconium oxynitrate (the molar ratio of cerium and zirconium is 9:1), add 1.30g of surfactant PVP, stir evenly, and use 0.4M ammonium carbonate solution as a precipitant to dissolve The metal ions were transformed into basic carbonate precipitates. After stirring continuously for 0.5 h, they were put into a hydrothermal kettle and heated at 160° C. for 16 h. After cooling to room temperature, they were centrifuged...

Embodiment 1

[0032]According to the requirements of the alloy stoichiometric ratio, dissolve 0.77g platinum acetylacetonate (1.97mmol), 0.36g nickel acetylacetonate (1.39mmol), and 0.69g cobalt acetylacetonate (1.93mmol) in dibenzyl ether to obtain a concentrated solution, and mix the concentrated solutions Dibenzyl ether solvent is used to dilute the total molar concentration of the metal components to 0.04mol / L to obtain a mixed metal ion dibenzyl ether solution; under stirring, add 1,2 hexadecanediol to the mixed metal dibenzyl ether solution 2.5mmol, 3mmol of oleic acid and 2mmol of oleylamine, heated and refluxed at 270°C for 40min; after cooling, ethanol was added to precipitate the aggregated precipitate of alloy particles, and after being fully dried, dispersed in toluene to obtain the composition Pt 38 Ni 27 co 35 Nanoalloy dispersed precursor solution.

[0033] Put 10g of ceria carrier powder into the container and wet it with toluene; under stirring, inject the nano-alloy disp...

Embodiment 2

[0036] According to the requirements of the alloy stoichiometric ratio, 0.77g platinum acetylacetonate (1.97mmol), 0.36g nickel acetylacetonate (1.39mmol), 0.69g cobalt acetylacetonate (1.93mmol) were dissolved in octyl ether to obtain a concentrated solution, and the concentrated solution was mixed and used The octyl ether solvent dilutes the total molar concentration of the metal components to 0.04mol / L to obtain a mixed metal ion octyl ether solution; under stirring, add 1,2 hexadecane glycol 2.5mmol, oil Add 3mmol of acid and 2mmol of oleylamine, heat and reflux at 270°C for 40min; add methanol after cooling to precipitate alloy particle aggregates, and after fully drying, disperse into n-hexane to obtain the composition Pt 38 Ni 27 co 35 Nanoalloy dispersed precursor solution.

[0037] Put 50g of cerium-zirconium oxide carrier powder into the container, and wet it with n-hexane; under stirring, inject the nano-alloy dispersed precursor solution (nano-alloy content is 0....

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Abstract

The invention discloses a nano alloy modified cerium oxide powder applied to soot combustion reaction, and a preparation method thereof, and relates to cerium oxide powder. The powder is prepared from a platinum nano alloy phase and a cerium oxide or cerium-zirconium mixed oxide carrier. The method comprises the following steps: mixing organic salt of each metal component, and then preparing into a mixed metal ion octyl ether solution or a mixed metal ion dibenzyl ether solution; adding a mixed surfactant to the mixed metal ion octyl ether solution or the mixed metal ion dibenzyl ether solution, so as to obtain a reduction-type mixed metal particle dispersed solution; heating and refluxing the reduction-type mixed metal particle dispersed solution, and then adding a high-polarity alcohol solvent to separate out nano particles in a gathering manner; dispersing into a low-boiling point organic solvent after removing the alcohol solvent in a volatilizing manner, so as to prepare nano alloy disperse precursor solution; putting the carrier into a container, and wetting by using an organic solvent, so as to obtain a wetting vector; injecting the nano alloy disperse precursor solution to the wetting carrier, lastingly stirring until a mobile phase volatilizes, so as to obtain wetting powder; drying and burning, so as to obtain the product.

Description

technical field [0001] The invention relates to cerium oxide powder, in particular to a material preparation technology and method for surface modification of cerium oxide powder with a nano-alloy material with high-efficiency oxygen reduction ability to improve the catalytic oxidation activity of carbon particles, which is used for soot Combustion reaction nano-alloy modified cerium oxide powder and its preparation method. Background technique [0002] Using a particulate filter (DPF) to filter out particulate matter in exhaust gas is the most effective means of removing particulate matter in the exhaust gas treatment technology of diesel internal combustion engines, and has the least impact on the power and economy of motor vehicles. The introduction of a complete oxidation catalyst in the device can reduce the thermal decomposition temperature of soot particles to 150-400°C, so as to effectively prevent excessive accumulation of carbon particles on the filter and cause fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
Inventor 黄爱民钟伟建
Owner XIAMEN XINPUCHUANG PHOTOELECTRIC MATERIALS
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