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Method for preparing Pd/C catalyst by using organic aerogel supported Pd compound and Pd/C catalyst

An aerogel and compound technology, applied in the field of Pd/C catalysts, can solve the problems of poor dispersion uniformity of palladium metal, large diffusion resistance, agglomeration of palladium metal, etc., so as to be beneficial to environmental protection and operation safety, and reduce diffusion resistance. , the effect of simplifying the preparation steps

Inactive Publication Date: 2013-01-30
LANCEE NEW MATERIAL TECH SHANGHAI CO LTD
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  • Abstract
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Problems solved by technology

The preparation methods of the above two palladium-carbon catalysts are actually directly adsorbing palladium metal or palladium compounds through activated carbon after surface activation treatment, and the dispersion uniformity of palladium metal is relatively low.
The palladium-carbon catalyst prepared by these two methods has a small force between the palladium metal and the activated carbon, which is easy to cause the palladium metal to fall off, and the pore size of the activated carbon is mainly micropores (<2nm) and a small amount of small pores (2-5nm). Mainly, the palladium-carbon catalyst directly supported by activated carbon has relatively high diffusion resistance, which is easy to cause the agglomeration of palladium metal.
And all relate to using a large amount of hydrochloric acid or sulfuric acid in these two kinds of preparation methods, in the production environment of industrialized large-scale production catalyst, a large amount of corrosive acid can pollute environment, is unfavorable for environmental protection

Method used

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  • Method for preparing Pd/C catalyst by using organic aerogel supported Pd compound and Pd/C catalyst
  • Method for preparing Pd/C catalyst by using organic aerogel supported Pd compound and Pd/C catalyst
  • Method for preparing Pd/C catalyst by using organic aerogel supported Pd compound and Pd/C catalyst

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preparation example Construction

[0018] In order to realize the above-mentioned technical solution, the preparation method of the present invention uses the organic airgel with relatively developed primary pore structure as the initial carrier, and prepares it through steps such as equal-volume impregnation loading, aging, high-temperature carbonization, and hydrogen reduction. The specific method steps are: select the BET specific surface area as 100-500 m 2 / g, the organic airgel with a pore size distribution of 2-30 nm was used as the initial carrier for impregnation, and its saturated water absorption was detected; a certain mass of organic airgel was weighed, and then according to the equal volume impregnation method, the high temperature of the organic airgel The immersion solution containing Pd compound was prepared according to the cracking yield and the mass percentage content of Pd noble metal required to be loaded. Immerse the weighed organic airgel into the prepared impregnation solution according...

Embodiment 1

[0026] Weigh the BET specific surface area as 100 m 2 / g, 100 g of organic airgel with a pore size distribution of 2-30 nm; according to the equal-volume impregnation method, determine the amount of liquid for preparing the impregnating solution; Amount of noble metal, 0.0085mol / L palladium chloride (PdCl 2 ) 30 ml of impregnation solution, wherein the solvent of the impregnation solution is water, and the solute is palladium chloride; impregnate the organic airgel in the impregnation solution, and stir it moderately to make it evenly mixed. After uniform impregnation of equal volume, aging time at room temperature for 5 hours; then place the impregnated organic airgel in a carbonization reduction furnace and raise the temperature to 600°C under the protection of inert gas nitrogen, and perform constant temperature carbonization treatment for 1 hour; Under the protection of gas nitrogen, the temperature was naturally lowered to 100°C, and the reducing gas H was introduced 2 ,...

Embodiment 2

[0028] Select the BET specific surface area as 350 m 2 / g, 100 g of organic aerogels with a pore size distribution of 2-30 nm, according to the equal volume impregnation method, determine the amount of liquid for preparing the impregnating liquid; 0.0577mol / L palladium acetate (C 4 h 6 o 4 Pd) 55 ml of immersion solution, wherein the solvent of the immersion solution is water, and the solute is palladium acetate. Equal-volume impregnation and aging at room temperature for 24 hours; then in the carbon reduction furnace, the temperature was raised to 600°C under the protection of an inert gas, and the temperature was kept at a constant temperature for 3 hours; under the protection of an inert gas, the temperature was naturally lowered to 200°C, and the reduction Sexual gas H 2 , reduction treatment for 5 hours. After the reduction, it was naturally cooled to room temperature under the protection of an inert gas, and the material was taken out and stored in a vacuum-sealed p...

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Abstract

The invention relates to a method for preparing a Pd / C catalyst by using an organic aerogel supported Pd compound and the Pd / C catalyst. According to the method, organic aerogel is used as a carbon precursor and a catalyst support, a water-soluble Pd compound is used as an active ingredient source of the catalyst, and the catalyst is prepared by using an equal volume dipping method through the steps of dipping support, ageing, high-temperature carbonization and hydrogen reduction. The Pd / C catalyst prepared by the method has the advantages of high dispersion of the Pd metal, strong interaction between the Pd metal and the support, low loss of noble metals, and low dispersion resistance of the reactants and the reaction product in the pore structure of the catalyst in specific use.

Description

technical field [0001] The invention relates to a method for preparing a Pd / C (palladium / carbon) catalyst by utilizing a Pd (palladium) compound and a Pd / C catalyst prepared by the method. Background technique [0002] In the field of industrial catalysts, nanoscale noble metals have attracted great attention due to their large specific surface area and specific activity, especially supported noble metal catalyst systems, which can improve catalytic activity by adjusting the dispersion of metal particles. Pd / C catalyst has become one of the most commonly used catalysts for industrial catalytic reactions because of its large specific surface area and abundant surface groups, as well as good catalytic activity and chemical stability. Traditional Pd / C catalysts generally use coconut shell carbon with high mechanical strength as the carrier. Before the active components are loaded, it is necessary to use nitric acid (HNO 3 ) as a typical representative solution is an oxidizing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44
Inventor 王洪立于晓琳郭文峰
Owner LANCEE NEW MATERIAL TECH SHANGHAI CO LTD
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