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Ozone oxidation catalyst and preparation method thereof

A technology of ozone oxidation and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2019-03-22
HUAIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide an ozone oxidation catalyst and its preparation method for the problem of which catalyst is used to cooperate with ozone to achieve advanced oxidation to improve the effect of water treatment.

Method used

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  • Ozone oxidation catalyst and preparation method thereof
  • Ozone oxidation catalyst and preparation method thereof

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preparation example Construction

[0025] The preparation method of the ozone oxidation catalyst of an embodiment of the present invention, preparation method comprises the following steps:

[0026] adding an ammonia solution with a pH value of 11.0 to 11.7 into a +4-valent Sn source solution to prepare a precipitation solution;

[0027] The precipitated liquid is filtered and dried to obtain a tin dioxide solid;

[0028] Grinding and mixing tin dioxide solids and barium oxide solids according to the formula ratio to obtain mixed powders;

[0029] The mixed powder is calcined to obtain the catalyst.

[0030] In the catalyst prepared by the above method for preparing the ozone oxidation catalyst, tin dioxide is the main catalyst, and barium oxide plays the role of modifying and modulating the main catalyst in the catalyst. There are L (Lewis) acid and B (Bronsted) acid on the surface of transition metal oxide tin dioxide, and the strong surface acidity directly affects the adsorption and desorption of OH radic...

Embodiment 1

[0042] Weigh SnCl 4 ·5H 2 O (crystal) 35.05g and dissolved in tin chloride solution in 100mL distilled water. Measure 30.91 mL of ammonia water with a molar concentration of 5 mol / L as the ammonia solution. Slowly add ammonia solution dropwise to the tin chloride solution, and use electromagnetic stirring to ensure uniform precipitation. The precipitate in the prepared tin dioxide precipitation solution was in the form of white flocculation, and the tin dioxide precipitation solution was placed in an electric heating constant temperature drying oven, and aged at 353K for 3.0 h. Wash the precipitate with dilute ammonium nitrate solution until it is neutral, filter it under reduced pressure, put the filter cake into a 383K constant temperature drying oven to dry until the tin dioxide solid is in the form of transparent crystals, and then take it out. The molar ratio of tin dioxide: barium oxide is Weigh a certain amount of barium oxide powder and the obtained tin dioxide soli...

Embodiment 2

[0045] Weigh SnCl 4 ·5H 2 O (crystal) 28.04g and dissolved in tin chloride solution in 100mL distilled water. Measure 24.73 mL of ammonia water with a molar concentration of 5 mol / L as the ammonia solution. Slowly add ammonia solution dropwise to the tin chloride solution, and use electromagnetic stirring to ensure uniform precipitation. The precipitate in the prepared tin dioxide precipitation solution was in the form of white flocculation, and the tin dioxide precipitation solution was placed in an electric heating constant temperature drying oven, and aged at 350K for 2.5 hours. Wash the precipitate with dilute ammonium nitrate solution until it is neutral, filter under reduced pressure, put the filter cake in a 380K constant temperature drying oven to dry until the tin dioxide solid is in the form of transparent crystals, and then take it out. The molar ratio of tin dioxide: barium oxide is Weigh a certain amount of barium oxide powder and the prepared tin dioxide solid...

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Abstract

The invention discloses a preparation method of an ozone oxidation catalyst. The preparation method comprises the following steps: adding an ammonia solution with the pH value of 11.0 to 11.7 into a solution of a +4-valence Sn source, so as to prepare a precipitation solution; filtering the precipitation solution, and carrying out baking, so as to prepare stannic oxide solids; grinding and mixingthe stannic oxide solids and barium oxide solids according to a formula ratio, so as to prepare mixed powder; roasting the mixed powder, thereby preparing the catalyst. According to the ozone oxidation catalyst, stannic oxide serves as a main catalyst, and barium oxide plays a role in modifying and adjusting the main catalyst. The introduction of the barium oxide mainly means adjusting the acid size distribution ratio of each acid site and the strength of L acid of the surface of the stannic oxide and guaranteeing the adsorption and desorption balance of OH. free radicals, thus, ozone can durably and stably keep a large number of OH. free radicals in water, and the high oxidation action on organic matters in wastewater is improved, so that the catalytic activity of the catalyst and the stability of a catalyzed reaction are improved.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an ozone oxidation catalyst and a preparation method thereof. Background technique [0002] The rapid development of society, the acceleration of the industrialization process, and the economic growth followed by environmental pollution, air pollution, and water pollution are the focus of people's attention. The national environmental protection policy is: "green production, zero emissions" , "Whoever pollutes who governs" policy. In some enterprises, the up-to-standard discharge of sewage has become the bottleneck of enterprise development, such as pharmaceutical, medical, food, dye, fine chemical and other industries, there are problems of sewage discharge treatment. This type of sewage has the following common characteristics: high biochemical oxygen demand (Biochemical Oxygen Demand, BOD) value, chemical oxygen demand (Chemical Oxygen Demand, COD) value, high chroma, compl...

Claims

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Application Information

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IPC IPC(8): B01J23/14C02F1/72C02F1/78
CPCB01J23/14C02F1/725C02F1/78
Inventor 李万伟
Owner HUAIHUA UNIV
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