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Catalyst for low-temperature catalytic combustion of volatile organic compounds and preparation method thereof

A technology of volatile organic compounds and low-temperature catalysis, applied in combustion methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of low anti-poisoning ability, high price, and low ignition temperature and other problems, to achieve the effect of excellent activity, simple preparation process and high catalytic activity

Inactive Publication Date: 2012-12-19
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the catalysts currently used in this method are supported noble metal catalysts, such as Pt, Pd, Ru, Au, etc. ((1) Catal Today, 1999, 54:81 (2) Appl Catal B, 2012, 111-112: 218 ( 3) Chem Eng J, 2012, 180:46) These supported noble metal catalysts have the advantages of low light-off temperature and high activity, but at the same time, they have disadvantages such as high price, poor stability, and low anti-poisoning ability, which make their application restricted. Certain restrictions ((4) Chem Lett, 1999, 8:801 (5) J Catal, 2005, 232:96)

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  • Catalyst for low-temperature catalytic combustion of volatile organic compounds and preparation method thereof
  • Catalyst for low-temperature catalytic combustion of volatile organic compounds and preparation method thereof

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[0019] The preparation method of catalyst of the present invention is characterized in that: Al 2 o 3 Carrier, RE 2 o 3 -Al 2 o 3 The surface area of ​​composite oxide is 80~326m 2 / g. The active component palladium is loaded by an equal volume impregnation method, so that the particle size of the palladium is 1-50 nm. The catalyst preparation steps include in turn:

[0020] (1) Preparation of aluminum hydroxide and rare earth hydroxide mixture by co-precipitation method;

[0021] (2) Dry the hydroxide obtained above at 80-120°C in an air atmosphere, and then calcinate at 500-900°C to obtain RE 2 o 3 -Al 2 o 3 composite oxides;

[0022] (3) Equal volumes of the composite oxide obtained above are impregnated with the precursor solution of the active component, dried at 50-120°C step by step, and then calcined at 500-900°C.

[0023] In the above catalyst preparation method, the active component precursor in step (3) is a soluble palladium metal inorganic salt, prefe...

Embodiment 1

[0025] Weigh 56.2690g of Al(NO 3 ) 3 9H 2 O and 3.2876g of Nd(NO 3 ) 3 ·6H 2 O is placed in a conical flask, and water is added to 200ml. After the salt is completely dissolved, 28% ammonia water is added under the condition of electric stirring until the pH of the solution is 8-10. After stirring for 1 hour, the precipitate is left standing, centrifuged, and 120 ℃ for 12 hours, and then baked in muffle furnace air at 800 ℃ for 4 hours to obtain composite oxides. The specific surface area of ​​the composite oxide measured by a physical adsorption instrument (Micromeritics ASAP 2020) is 186.8 m 2 / g.

[0026] Then, grind and sieve, take a 30-80 mesh composite oxide carrier, and use an equal volume impregnation method to load Pd with a mass fraction of 0.5%. The specific process is as follows: take a certain volume of Pd solution to impregnate the carrier, stir for 5 minutes, ultrasonically sonicate for 10 minutes, then bake in an oven at 50°C for 0.5h, at 80°C for 0.5h, ...

Embodiment 2

[0029] RE 2 o 3 -Al 2 o 3 The preparation method of the composite oxide and the loading mode of the noble metal Pd are the same as in Example 1, except that the added rare earth nitrate is 0.5149g of Gd(NO 3 ) 3 ·6H 2 O, the calcination temperature of the composite hydroxide and the oxide after loading Pd is 600°C.

[0030] The specific surface area of ​​the composite oxide was measured by a physical adsorption instrument to be 186.8 m 2 / g. Transmission electron microscope (if attached figure 1) indicates that the size of the noble metal palladium particles in the catalyst is about 6 nm.

[0031] The activity evaluation method of the catalyst is the same as in Example 1. The experimental results showed that when the reaction temperatures were 200, 250, 300, 350, 400, 450, 500°C, the conversions of benzene were 10.85, 64.89, 99.65, 99.97, 100, 100, and 100%, respectively.

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Abstract

The invention discloses a catalyst for low-temperature catalytic combustion of volatile organic compounds and a preparation method thereof, belonging to the technical fields of chemical catalyst and preparation technology thereof. The catalyst contains, by mass percent, 0.1 to 1 % of an active ingredient Pb, 74 to 99.4 % of a carrier Al2O3 and 0.5 to 25% of an auxiliary agent RE2O3, wherein a specific surface area of a composite oxide RE2O3- Al2O3 is 80 to 326 m<2> / g. The catalyst provided by the invention is simple in preparation technology, easy to produce in large scale, and has a very high catalytic activity for low-temperature complete oxidation reactions of benzene, toluene, xylene, ethyl acetate, ethanol and propane. Provided is a novel and high-efficiency catalyst which can be used for purification treatment of the volatile organic compounds in fields of industrial exhaust or indoor pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical catalysts and their preparation, and in particular relates to a low-temperature catalytic combustion volatile organic compound catalyst and a preparation method thereof. Background technique [0002] Volatile Organic Compounds (VOCs for short) refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point lower than 260°C at normal pressure. It mainly includes aromatic hydrocarbons, aliphatic hydrocarbons, halogenated hydrocarbons, oxygenated hydrocarbons, terpene hydrocarbons, alcohols, aldehydes, ketones and esters. They are the main pollutants in the exhaust gas of petrochemical, pharmaceutical, printing, painting and other industries. Most of these organic substances are toxic and accompanied by stench, and some of them can cause cancer, and most VOCs have a destructive effect on the ozone layer. Traditional organic waste gas purificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63F23G7/07
Inventor 魏可镁魏笑峰肖益鸿蔡国辉郑勇
Owner FUZHOU UNIV
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