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Ctalyst for treating high concentrated organic wastewater and method for preparing the same

A technology of organic wastewater and catalyst, which is applied in chemical instruments and methods, water/sewage treatment, oxidized water/sewage treatment, etc. It can solve the problems of not meeting industrial application requirements, high precious metal content, high cost, etc., and achieve high activity and long-term Effect of life and cost reduction

Inactive Publication Date: 2005-04-20
YUNNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this kind of catalyst has two serious problems, one is that it is mainly provided in the form of powder, which does not meet the requirements of industrial application; the other is that there is a large amount of dissolution under high temperature, high pressure, and acid-alkali environment
[0004] (2), the patent application of Japan Osaka Gas Co., Ltd. (application number 86102728), it is to be carrier with titanium oxide or zirconium oxide, load metal ruthenium catalyst, and the ruthenium content of industrial application is about 2%, and its precious metal content high, high cost

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0011] Example 1: Metatitanic acid and titanium glue were kneaded and extruded at 8:2, pelletized, shaped into small spherical particles, dried at 80-120°C for 8 hours, heated to 920°C at a rate of 5°C / min and sintered to become With anatite as 95% of the carrier, the rest is rutile, the average strength is greater than 105N / particle, and the specific surface is 23 2 / g; on this basis, the nano-titanium dioxide adjusted into the slurry is coated on the surface of the ball, the weight of the nano-titanium dioxide accounts for 10% of the small ball, and the thickness is 10-100 μm. In order to prevent the surface nano layer from falling off and maintain the high specific surface characteristics, sinter at 300-600°C for 4 hours; then impregnate the above carrier in cerium nitrate Ce(NO 3 ) 3 with manganese chloride MnCl 2 Add ammonia water dropwise to the solution prepared according to 7:4 (molar ratio), filter, dry the liquid at 60-120°C, decompose it with air at 350°C for 2 ho...

Embodiment 2

[0013] Embodiment 2: Carrier all adopts nano-titanium dioxide powder, powder: water: the weight ratio of organic glue (gelatin)=2: 0.5: 1 is adjusted into pasty state, by kneading, extruding, pelletizing, shaping into the small size of Φ2~Φ5 Balls, dried at 60-120°C for 4 hours and sintered at 300-600°C for 6 hours are made of titanium oxide carrier, with an average strength greater than 130N / ball and a specific surface greater than 88m 2 / g, the impregnation of rare earth and transition metal, active metal adopts lanthanum nitrate and cobalt nitrate, and its impregnation method is similar to the method of embodiment 1, and the catalyst that makes contains rare earth lanthanum oxide 2.3%, cobalt oxide 1.3%, active metal precious metal ruthenium (Ru) 0.2%. Using this method, the precious metal content can be reduced by about half compared with the previous method, and the precious metal content can be reduced to as low as 0.2%, which is only 0.18 in actual measurement.

[0014...

Embodiment 3

[0015] Embodiment 3: the preparation method of carrier is identical with embodiment 2, and the impregnation method of active metal and noble metal is identical with embodiment 1, and noble metal adopts palladium chloride (PdCl 2 ), the effect of the prepared catalyst to treat wastewater is: COD Cr The removal rate was 81.9%, NH 3 The removal rate of -N is 99%.

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Abstract

The invention relates to a catalyst and a preparation method for treating high-concentration organic wastewater. It is characterized in that it contains one or two active metal components of ruthenium, platinum, palladium, rhodium and gold, and its weight percentage is 0.05-0.5%; the weight percentage of the coating containing nano-titanium oxide is 1-15%, and it contains rare earth At least one of oxides of lanthanum, cerium or transition metals cobalt, nickel, bismuth, vanadium and manganese, the percentage by weight is 0.5-10%. The catalyst and preparation method of the present invention can reduce the precious metal content in the catalyst to 0.1-0.5%, which is equivalent to one-fourth to one-tenth of the aforementioned Japanese catalyst, can greatly reduce the cost, can maintain high activity, and has a long life, durable High temperature, high pressure, acid, alkali environment, no dissolution, can meet the requirements of industrial scale treatment.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a catalyst and a preparation method for treating high-concentration organic wastewater. Background technique [0002] High-concentration organic wastewater is a serious water pollutant. Due to its complex composition and toxicity, countries have invested a lot of manpower and material resources in research. At present, international research in this direction mainly focuses on the following aspects: [0003] (1) Laboratory research, develop different catalysts for different wastewater. For example, Pt and Pd catalysts supported by alumina, catalysts of various precious metals supported by cerium oxide, manganese oxide, and titanium oxide activated carbon. But this kind of catalyst has two serious problems, one is that it is mainly provided in the form of powder, which does not meet the requirements of industrial application; the other is that there is a large amount of diss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00C02F1/72
Inventor 涂学炎张世鸿李自弘
Owner YUNNAN UNIV
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