Preparation method of compound catalyst for controlling generation of bromate in process of using ozone

A catalyst, composite technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of producing bromate by-products, etc., and achieve the goal of improving ozone disinfection effect, reducing cost and improving efficiency. Effect

Inactive Publication Date: 2012-06-27
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the existing schemes stated above, for the problem of bromate by-products can be produced during the use of ozone, the purpose of the invention is to develop a composite catalyst that can effectively control the production capacity of bromate by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of the supported composite catalyst: the carrier is zeolite, and the particle size can be about 2mm. After washing, soak it with 1 mole per liter of nitric acid for 1-2 days, take it out and wash it to complete the pretreatment. Soak in a mixed solution of 0.2mol / L cerium nitrate and 0.2mol / L titanium nitrate for 36 hours, the mass ratio of the catalyst carrier to the mixed solution is 0.3:1, pour out the supernatant and reuse it after soaking The carrier was put into a muffle furnace for calcination at 600°C for 2 hours, and the catalyst was obtained after cooling.

Embodiment 2

[0021] Other is the same as embodiment 1, carries out the immersion of cerium nitrate and titanium nitrate different mixing concentrations in parallel, and the concentration of cerium nitrate / titanium nitrate is respectively the cerium nitrate / nitrate of 1.0mol / 1.0mol, 1.0mol / 0.1mol, 1.0mol / 0.5mol Soak in titanium mixture.

Embodiment 3

[0023] Preparation of ceria-type supported catalyst:

[0024] Others are the same as in Example 1, the carrier is activated alumina, the soaked carrier is put into a muffle furnace for calcination at 500° C. for 4 hours, and the catalyst is obtained after cooling.

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PUM

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Abstract

The invention discloses a preparation method of a compound catalyst for controlling the generation of bromate in the process of using ozone, characterized by using cerium nitrate and titanium nitrate as main raw materials, and carrying out pretreatment and then calcining to prepare the compound catalyst. According to the invention, by controlling the generation of hydroxy free radicals, the generation of bromate in the process of using ozone is controlled, and the bromate problem of influencing people health is solved; the control efficiency of the catalyst is high, the service life is long, the cost is low, no toxicity exists, and no influence on human health exists; simultaneously, in the process of ozone disinfection, the catalyst can effectively adsorb microbes and organic carboxylic acid in water, so as to raise the ozone disinfection effect and the removal rate of oxidized organic matters.

Description

Technical field: [0001] The catalyst of the present invention is especially in the field of composite catalyst manufacture for controlling bromate formation in the process of using ozone. Background technique: [0002] Ozone is an allotrope of oxygen, and its oxidation-reduction potential is 2.07V under acidic conditions, which has strong oxidizing properties. Ozone will generate a hydroxyl radical (·OH) with stronger oxidizing ability at the excitation point of a specific substance. The oxidation-reduction potential of hydroxyl radical is second only to fluorine, and it is currently the strongest oxidant used in the water treatment industry. Hydroxyl radicals are basically non-selective when oxidizing organic matter, and can react with most organic matter, and the reaction speed is very fast. [0003] In 1876, the molecular formula of ozone was determined, and people began to have a strong interest in ozone. Ozone is loved by people because of its strong oxidizing propert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J29/04C02F1/28C02F1/78
Inventor 王群董海山马军叶琳嫣
Owner SOUTHWEST JIAOTONG UNIV
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