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Palladium alumina catalyst for production of hydrogen peroxide by anthraquinone process and its preparation method

A palladium alumina, hydrogen peroxide technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, peroxide/peroxyhydrate/peroxyacid/superoxide/ozonide, etc. direction, can solve the problem of low compressive strength of the catalyst, and achieve the effects of good selectivity balance, high compressive strength and balanced surface area

Active Publication Date: 2012-08-08
陕西开达化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the compressive strength of existing catalysts is relatively low, only about 50N

Method used

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  • Palladium alumina catalyst for production of hydrogen peroxide by anthraquinone process and its preparation method
  • Palladium alumina catalyst for production of hydrogen peroxide by anthraquinone process and its preparation method
  • Palladium alumina catalyst for production of hydrogen peroxide by anthraquinone process and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085]The aluminum hydroxide is pulverized in a mechanical mill to 1 μm to 50 μm, sent into a flash roaster, and flash roasted for 0.5 seconds at an inlet temperature of 1000°C to obtain a quick dehydration powder; weigh pseudo-boehmite, Mix the obtained quick-release raw powder and pseudo-boehmite according to the mass percentage of 80:20, and the mixing time is 1 hour, then send the mixed material into a pan granulator for granulation, and use water It is a binder; on the disc granulator, add a pore-enlarging agent to make the pore size reach a nonlinear and asymmetric distribution on the cross-section of the carrier to obtain a pellet; the pore-expanding agent is cellulose; send the formed pellet into the rolling equipment Carry out surface treatment in the process, grind off the protruding part of the surface, and preliminarily grind off part of the surface attached powder to reduce wear; wherein, the speed of surface treatment is 40 rpm, the treatment time is 5min, and the...

Embodiment 2

[0088] The aluminum hydroxide is pulverized in a mechanical mill to 1 μm to 50 μm, and sent to a flash roaster for 1 second, and the inlet temperature is 1050°C to obtain a quick dehydration powder; weigh pseudo-boehmite, Mix the obtained quick-release raw powder and pseudo-boehmite according to the mass percentage of 95:5, and the mixing time is 1 hour, and then the mixed material is sent into a pan granulator for granulation, and is mixed with water It is a binder; on the disc granulator, add a pore-enlarging agent to make the pore size reach a nonlinear asymmetric distribution in the cross-section of the carrier to obtain a pellet; the pore-expanding agent is cellulose methyl ether; send the formed pellet into Carry out surface treatment in rolling equipment, grind off the protruding part of the surface, and preliminarily grind off part of the surface attached powder to reduce wear; among them, the speed of surface treatment is 40 rpm, the treatment time is 30min, and the po...

Embodiment 3

[0091] The aluminum hydroxide is pulverized in a mechanical mill to 1 μm to 50 μm, and sent to a flash roaster for 0.8 seconds, and the inlet temperature is 1020°C to obtain a quick dehydration powder; weigh pseudo-boehmite, Mix the obtained quick-release raw powder and pseudo-boehmite according to the mass percentage of 90:10, and the mixing time is 1 hour, and then the mixed material is sent into a pan granulator for granulation, and the mixture is mixed with water It is a binder; on the disc granulator, add a pore-enlarging agent to make the pore size reach a nonlinear asymmetric distribution in the cross-section of the carrier to obtain a pellet; the pore-expanding agent is polyethylene glycol; send the formed pellet into Carry out surface treatment in rolling equipment, grind off the protruding part of the surface, and preliminarily grind off part of the surface adhesion powder to reduce wear; among them, the speed of surface treatment is 40 rpm, the treatment time is 20mi...

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Abstract

The invention discloses a palladium alumina for production of hydrogen peroxide by an anthraquinone process. The catalyst comprises gamma-Al2O3 as the carrier, the content of which is over 97wt%; and metal palladium as the main active component, the loading of which is 0.1wt%-0.5wt% and the dipping thickness of which is from 10 micrometers to 100 micrometers. The invention also discloses a preparation method of the catalyst, and the method consists of: roasting aluminum hydroxide, mixing the roasted aluminum hydroxide with pseudoboehmite, then adding a pore-expanding agent for molding, conducting surface treatment so as to obtain a catalyst carrier, then performing pre-spraying on the carrier with a locating agent, carrying out drying, and then putting the carrier into a chloropalladate solution for dipping. With appropriate specific surface area, pore volume and pore size distribution, the palladium catalyst provided in the invention is difficult to shed and fragment. In actual production of hydrogen peroxide by an anthraquinone process, the catalyst shows excellent balance between activity and selectivity, as well as good service life and regeneration cycle.

Description

technical field [0001] The invention belongs to the technical field of organic catalysts, and relates to a supported hydrogenation catalyst with activated alumina as a carrier and noble metal palladium as an active component, and also relates to a preparation method of the alumina catalyst. Background technique [0002] Hydrogen peroxide is a green chemical product, and its production and use are almost pollution-free, so it is called a "clean" chemical product, and its application prospects are very promising. At first, hydrogen peroxide was only used in medicine and military industries, and later it was gradually used in chemical synthesis, textile, papermaking, environmental protection, food, medicine, metallurgy and agriculture, and the market demand is expanding day by day. At present, due to the country's tightening and increasing requirements for environmental pollution control year by year, many types of inorganic oxidants (such as SO 2 , NO and H 2 S, etc.) are gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/10C01B15/023
CPCY02P20/584
Inventor 余建强曹风华刘荣闫春琴
Owner 陕西开达化工有限责任公司
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