Supported palladium catalyst and preparation method thereof

A technology of catalyst and metal palladium, which is applied in the field of supported metal palladium catalyst and its preparation, can solve the problems of large pressure drop in the system of industrial production equipment, poor catalyst activity selectivity, short catalyst renewal period, etc., and achieve bed pressure drop reduction Small size, high mechanical strength, and enhanced strength

Inactive Publication Date: 2014-04-02
JIANGSU GOLD BRIDGE SALT & CHEM GRP +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, the catalysts used in the production of hydrogen peroxide by the anthraquinone hydrogenation method in the industry are mainly ordinary alumina-supported catalysts formed by rolling balls, or supported catalysts formed by oily ammonia columns or single (double) screw extruded rods, ordinary alumina There are uneven pore size distribution, high...

Method used

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  • Supported palladium catalyst and preparation method thereof
  • Supported palladium catalyst and preparation method thereof
  • Supported palladium catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The raw material of the catalyst carrier is alumina (Shandong Aluminum Plant of Aluminum Corporation of China), with a specific surface area of ​​50-500m 2 / g, the pore volume is 0.8-1.2ml / g, Na 2 O≤0.1%, Fe 2 o 3 ≤0.02%. Using this as raw material, add pore-forming agent ammonium carbonate and polyvinyl alcohol and knead, extrude into a clover shape under the pressure of 16MPa, and carry out temperature programming at a uniform speed (1-2°C / min), 80-120 ℃ drying for 8 hours, 500-600 ℃ baking 6 hours, become γ-alumina.

[0040] Weigh 50g Φ2.5×5-8mm clover-shaped alumina and add 0.58g La(NO 3 ) 3 La(NO 3 ) 3 After soaking in the solution for 10 minutes, vacuum-dry at 80°C for 2h, and then calcined at 900°C for 5h. Get 7ml of palladium-containing solution again, add 1.0g50wt% Mn(NO 3 ) 2 The aqueous solution was heated to 90°C, and the clover-shaped alumina treated with lanthanum was poured into it, vacuum-reduced and impregnated for 10 minutes, then the catalys...

Embodiment 2

[0041] Example 2 Prepare Pd / Al with a palladium loading of 0.3wt% in the same manner as in Example 1, a manganese loading of 0.3wt%, and a lanthanum loading of 1.0wt%. 2 o 3 Catalyst, the catalyst number is CAT-2.

Embodiment 3

[0042] Example 3 In the same way as in Example 1, the palladium loading was 0.5wt%, the manganese loading was 0.2wt%, and the lanthanum loading was 1.5wt% Pd / Al 2 o 3 Catalyst, the catalyst number is CAT-3. This catalyst is used in the catalytic hydrogenation of anthraquinone to produce hydrogen peroxide. The catalytic activity changes with time. See the appendix. figure 2 .

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Abstract

The invention discloses a supported palladium catalyst and a preparation method thereof. The catalyst comprises a carrier, aid ingredients and an active ingredient, wherein the carrier is gamma-aluminum oxide, the aid ingredients are lanthanum and manganese or lanthanum and cobalt, and the active ingredient is palladium; the palladium load capacity is 0.2 wt% to 0.8 wt%, the lanthanum load capacity is 0.5 wt% to 1.5 wt%, and the manganese or cobalt load capacity is 0.2 wt% to 0.5 wt%. According to the catalyst, the carrier is modified with aids subjected to vacuum adsorption drying, and a proper amount of the manganese or the cobalt is added, so that the growth of Al2O3 crystal particles during high-temperature treatment can be inhibited, the specific surface area of the catalyst is enlarged, the Pd dispersity is improved, the alkalinity of the carrier surface is enhanced, the Pd concentration of the catalyst surface is increased, the Pd layer thickness is reduced, and the hydrogenation activity and selectivity of the catalyst are improved; meanwhile, the prepared catalyst is high in mechanical strength, uniform in aperture distribution and low in impurity content.

Description

technical field [0001] The invention relates to a supported metal palladium catalyst and a preparation method thereof. The catalyst can be used in the reaction of anthraquinone hydrogenation to prepare hydrogen peroxide, and belongs to the field of chemical material preparation. Background technique [0002] Hydrogen peroxide is an important inorganic chemical product, which is widely used in papermaking, chemical industry, food, environmental protection and other fields. In recent years, with the continuous development of the green chemical process, the demand for hydrogen peroxide is increasing, which in turn promotes the continuous growth of hydrogen peroxide production. The anthraquinone method has many advantages such as easy automation, large production capacity, low cost and energy consumption, and has become the first choice in the preparation of hydrogen peroxide. The process of preparing hydrogen peroxide by anthraquinone method is mainly composed of the following...

Claims

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Application Information

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IPC IPC(8): B01J23/656B01J23/89B01J32/00B01J37/02C01B15/023
Inventor 申卫卫宋金文夏志臧涵朱成杰
Owner JIANGSU GOLD BRIDGE SALT & CHEM GRP
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