Preparation method of modified alumina carrier, palladium catalyst and preparation method thereof

A technology of alumina carrier and palladium catalyst, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., can solve the problem of increasing energy consumption and cost, strength and ratio of alumina carrier. The surface area is not high and the catalyst activity is affected, so as to achieve the effect of reducing equipment cost, shortening the production process and reducing the waste of water resources.

Active Publication Date: 2022-04-26
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses sodium metaaluminate as a raw material, which will introduce sodium ions, which will affect the activity of the catalyst. To remove it, a large number of washing operations are required, which increases energy consumption and cost.
And the final alumina support strength and specific surface area are not high

Method used

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  • Preparation method of modified alumina carrier, palladium catalyst and preparation method thereof

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preparation example Construction

[0039] The method for preparing the modified alumina carrier provided by the present invention does not need to prepare pseudo-boehmite, and the aluminum source can be formed directly after being gelled and filtered through acid dissolution, followed by freeze-drying and roasting treatment, which greatly shortens the production process and reduces equipment cost, and is convenient for industrialized production. The method has the advantages of simple operation process, short process and high production efficiency, and the prepared carrier has the advantages of many acidic active sites, large pore size, high particle strength and large specific surface area, and is suitable for application in the field of petrochemical industry.

[0040] Therefore, another aspect of the present invention provides a palladium catalyst comprising palladium nanoparticles and the above-mentioned carrier, the palladium catalyst can be used in the process of preparing hydrogen peroxide by anthraquinon...

Embodiment 1

[0046] Weigh 20g Al(NO 3 ) 3 9H 2 O was dissolved in 100 mL of absolute ethanol, stirred and heated to 70°C, and ammonium carbonate aqueous solution with a concentration of 1 mol / L was added dropwise to make the pH reach 7, and the reaction was continued for 4 hours after the addition was completed. After the reaction, filter, wash, disperse in 20mL deionized water, add concentrated nitric acid drop by drop, make the acid-aluminum ratio 0.1, and generate alumina colloid. Mix silica sol and alumina colloid evenly at a mass ratio of 0.1, drop it into the oil phase with a dropping pill machine, take out the shaped balls, place the shaped balls at the bottom in ammonia water with a mass concentration of 2%, and the upper layer is a bracket In the aging kettle, the molded pellets were placed on the support, and the aging kettle was heated to make the temperature in the kettle reach 80°C. The molded pellets reacted slowly in an ammonia atmosphere, and the reaction time was 30 minu...

Embodiment 2

[0050] PdCl 2 and NaCl were dissolved in distilled water, and the aqueous solution with a concentration of 0.03gPd / mL was prepared for subsequent use, and the same method as in Example 1 was used to prepare Pd / Al with a palladium content of 0.3%. 2 o 3 Catalyst, the catalyst Pd particle size, specific surface area, pore size, hydrogenation efficiency, selectivity are measured, and the measurement results are shown in Table 1.

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Abstract

The invention relates to the technical field of catalysts, and provides a method for preparing a modified alumina carrier, the method comprising: preparing alumina colloid; mixing the alumina colloid and silica sol to make a spherical carrier; Aging, drying, and roasting are carried out in sequence to obtain a modified alumina carrier; this method does not need to prepare pseudo-boehmite, and the aluminum source can be formed directly after gelling, filtering, and acid-dissolving, which greatly shortens the production process and reduces equipment costs. Industrialized production; the prepared carrier has the advantages of many acidic active sites, large pore size, high strength and large specific surface area. Provided is a palladium catalyst comprising the above-mentioned carrier and a preparation method thereof, in which the metal reduction process does not require high-temperature roasting and hydrogen reduction treatment, and has the advantages of safety, high efficiency, and low energy consumption; the prepared catalyst has palladium nanoparticles Small particle size, large specific surface area, moderate pore size, high hydrogenation efficiency and selectivity.

Description

technical field [0001] The present invention relates to the technical field of catalysts, more specifically, to a method for preparing a modified alumina carrier, a palladium catalyst comprising the carrier obtained by the above method, and a method for preparing the palladium catalyst, and the palladium catalyst can be applied to Preparation of hydrogen peroxide by industrial anthraquinone method. Background technique [0002] h 2 o 2 As a traditional green chemical product, it is widely used in electronics, medicine, chemical industry, food, environmental protection and other fields. Among the currently known methods, the methods for producing hydrogen peroxide mainly include anthraquinone method, electrolysis method, isopropanol oxidation method and the like. Among these methods, the anthraquinone method has become the domestic and foreign production method for H due to its low energy consumption, low equipment and process cost, and large production capacity. 2 o 2 T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/12B01J23/44B01J35/10C01B15/023B82Y30/00B82Y40/00
CPCB01J21/12B01J23/44B01J35/1019B01J35/1061C01B15/023B82Y30/00B82Y40/00
Inventor 李义涛胡聿明钟颖贤余航黄永锋唐火强何鑫
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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