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Method and application of preparing ozone catalyst by step gradient heating calcination method

A gradient heating and step-type technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, etc., to achieve the effect of maintaining load strength, not easy to aggregate and sinter, and improving contact

Active Publication Date: 2019-12-13
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem of how to further improve the activity of the ozone catalyst, the present invention provides a method for preparing an ozone catalyst by a gradient temperature-increasing calcination method and its application

Method used

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  • Method and application of preparing ozone catalyst by step gradient heating calcination method
  • Method and application of preparing ozone catalyst by step gradient heating calcination method
  • Method and application of preparing ozone catalyst by step gradient heating calcination method

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Embodiment 1

[0043] The aluminum-based precursor materials used in this embodiment are: aluminum isopropoxide and anhydrous glucose.

[0044] Dissolve 14.4g of aluminum isopropoxide in 100mL of deionized water, add 5g of anhydrous glucose, and stir in a stirrer at a speed of 400r / min for 6 hours at 35°C to make it completely uniform; The material was dried in an oven at 105°C to constant weight, and then taken out for use;

[0045] Put the dried material in a muffle furnace, in the air atmosphere, first raise the temperature to 90°C at 5°C / min, keep it for 1h, then raise the temperature to 200°C at 3°C / min, keep it for 2h, and then , the temperature was raised to 550°C at 3°C / min, kept at 4h, and cooled to room temperature at 2°C / min. The obtained catalyst was washed with deionized water three times to remove excess metal ions and their oxide. The washed material was dried in an oven at 105°C, and placed in a drying oven for later use. The obtained ozone catalyst is denoted as Y-Al-1. ...

Embodiment 2

[0054] The aluminum-based precursor material used in this embodiment is: aluminum nitrate.

[0055] Weigh 7.5g of aluminum nitrate nonahydrate and place it in a 250mL beaker, add 60mL of deionized water to dissolve, stir at 350r / min for 6h at room temperature, dry the evenly stirred material in an oven at 105°C to constant weight, and take it out for use;

[0056] Put the dried material in a muffle furnace, first raise the temperature to 90°C at 5°C / min, keep it for 1h, then raise the temperature to 200°C at 3°C / min, keep it for 2h, and then raise it at 3°C / min The temperature was raised to 550°C for 4 hours, and the temperature was lowered to room temperature at 2°C / min. The obtained catalyst was washed with deionized water for 5 times to remove excess metal ions and their oxides on the surface of the catalyst particles. The washed material was dried in an oven at 110°C, and placed in a drying oven for later use. The obtained ozone catalyst is denoted as X-Al-1.

Embodiment 3

[0064] The aluminum-based precursor material used in this embodiment is: alumina particles; the active component is: copper nitrate trihydrate.

[0065] Take a commercially available alumina particle catalyst with a particle size of 2 to 4 mm, grind the particles into fine particles of 30 to 60 mesh with a grinder, weigh 30 g of the catalyst, add 6.42 g of copper nitrate trihydrate, fully stir until uniform, and place the supported catalyst on the Dry in an oven at 110°C, then take out the material and place it in a ceramic crucible, place it in a muffle furnace, first raise the temperature to 90°C at 5°C / min, keep it for 1 hour, and then raise the temperature to 200°C at 3°C / min ℃, keep warm for 2h, further, heat up to 550°C at 3°C / min, keep warm for 4h, cool down to room temperature at 2°C / min, and wash the prepared material 4 times with deionized water to remove catalyst particles Excess metal ions and their oxides on the surface. The washed material was dried in an oven a...

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Abstract

The invention discloses a method and application for preparing an ozone catalyst by a stepwise gradient temperature-increasing calcination method, which belongs to the field of environmental protection materials. It includes adding water and stirring the aluminum-based precursor material evenly to obtain an active precursor material; drying the active precursor material to obtain an active material; roasting the active material to obtain an ozone catalyst, and the roasting method is a programmed stepwise gradient temperature rise calcination method . The method of the invention can effectively improve the TOC removal efficiency of the ozone catalyst in waste water, and the catalyst is prepared by the method of the invention, which has simple steps, is easy to control, and is more conducive to the mass production of the high-efficiency ozone catalyst.

Description

technical field [0001] The invention belongs to the field of environmental protection materials, and more specifically relates to a method and application of an ozone catalyst prepared by a stepwise gradient temperature-increasing calcination method. Background technique [0002] With the development of reform and opening up, the chemical industry has sprung up like mushrooms, and a series of environmental pollution problems have become increasingly serious. The pesticide industry is one of the typical representatives of the fine chemical industry. Pesticide wastewater has become an urgent problem for chemical companies due to problems such as large total COD, high content of toxic substances, and poor biodegradability. Ozone has a strong oxidizing ability and can directly mineralize organic matter into substances with smaller molecular weights. However, ozone has a strong oxidation selectivity, resulting in the incomplete mineralization of organic pollutants into CO 2 and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/04B01J23/34B01J23/72B01J23/75B01J37/08C02F1/72C02F1/78C02F101/30
CPCB01J21/04B01J23/34B01J23/72B01J23/75B01J37/08C02F1/72C02F1/78
Inventor 卞为林张威王津南李爱民戴建军李妙月程月
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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