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Supported palladium catalyst for producing hydrogen peroxide by anthraquinone process and preparing method thereof

A technology for hydrogen peroxide and supported palladium is applied in the production of hydrogen peroxide supported hydrogenation catalyst by anthraquinone method and the field of preparation thereof, and can solve problems such as unseen anthraquinone process and the like

Inactive Publication Date: 2003-08-13
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But they are all just as hydrogen, oxygen directly synthesizes H 2 o 2 The catalyzer of technology, does not see the relevant report that is used for anthraquinone technology

Method used

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preparation example Construction

[0008] The preparation method of the catalyst of the present invention adopts an impregnation method, which can be divided into a high temperature (50-98° C.) impregnation method and a room temperature (10-35° C.) impregnation method according to the temperature of the impregnation solution. The dipping equipment can use conventional dipping tanks. The preparation process includes the following steps: (a) coating the aluminum oxide carrier with a certain amount and a certain concentration of rare earth nitrate or acetate solution. The alumina carrier used is δ-Al 2 O 3 , θ-Al 2 O 3 , or δ-, θ-mixed phase alumina, its BET surface area is 60-130m 2 / g, the average pore radius is about 10-14nm, Na 2 O content 2 O 3 Then, while undergoing high-temperature phase inversion of alumina, it becomes a rare earth oxide. The drying and calcination of the catalyst of the present invention can adopt any conventional method, and there is no special requirement for drying and calcinati...

Embodiment 1

[0013] Weigh 30g γ-Al 2 O 3 As a carrier, its shape and size are φ3×5-20 (mm) columnar, impurity Na 2 O2 / g in a 250ml glass beaker. 18ml of La(NO 3 ) 3 The aqueous solution is poured into the above-mentioned alumina and stirred to make it absorb evenly. Put the alumina after absorbing the rare earth nitrate aqueous solution into an oven for dehydration at about 80-120°C for about 60 minutes, then transfer it to a high-temperature furnace and calcinate it at 800-1000°C for 2-10 hours in the atmosphere, then cool down to room temperature , the loaded amount of rare earth oxide on alumina is about 2%wt.

[0014] Put the above treated alumina carrier into a 250ml glass beaker, pour 60ml of Na 2 PdCl 4 solution, soaked for 3 minutes, filtered out the catalyst and drained, put it in a drying oven at 80-120°C for 60 minutes, took it out and put it in a glass beaker, and poured 60ml of it into a concentration of 0.00515mol / l. Na at a temperature of about 98°C 2 PdCl 4 solu...

Embodiment 2

[0018] Repeat the process of embodiment 1, just change the rare earth salt solution into 18ml concentration and be the Nd(NO 3 ) 3 aqueous solution. The weight content of rare earth oxide on the support is about 1%, and the weight content of metal palladium is 0.205%.

[0019] This catalyst adopts the condition evaluation identical with embodiment 1, and its hydrogenation rate constant is: 10.492 * 10 -2 mol / h.l; hydrogen efficiency: 9.1g H 2 O 2 / l; degradation products 2 O 2 (27.5%).

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Abstract

A carried Pd-alumina catalyst for preparing hydrogen peroxide by anthraquinone method is prepared from Pd as main active component and Al2O3 as carrier through impregnation. Said Al2O3 has been coated by RE oxide and calcined at 900-1000 deg.C. It has high hydrogenating efficiency of 8-9 gH2O2 / L for 2-ethyl anthraquinone / heavy arene plus trioctyl phosphate or 10-13 gH2O2 / L for (2-tert-butyl anthraquinone plus 2-ethyl anthraquinone) / (heavy arene plus tetrabutyl urea).

Description

Technical field: [0001] The invention relates to an Al alloy pre-impregnated with a suitable amount of rare earth oxide and calcined at a high temperature of 900-1000°C. 2 O 3 The hydrogen peroxide supported hydrogenation catalyst is produced by an anthraquinone method with palladium as the carrier as the main active component and a preparation method thereof. To be precise, it belongs to a metal catalyst and its preparation method. Background technique: [0002] Anthraquinone method is currently the world's largest production of H 2 O 2 the most widely used method. Palladium on alumina or other platinum group metal catalysts are the most commonly used hydrogenation catalysts for this process. In order to continuously improve the performance of catalysts and reduce the amount of expensive platinum group metals, people have done a lot of work on the impregnation process of platinum group metals (such as palladium) and the selection and modification of supports for a long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/63C01B15/023
Inventor 王榕林墀昌陈天文林建新毛树禄
Owner FUZHOU UNIV
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