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Composite catalyst as well as preparation method and application thereof

A technology of composite catalysts and oxides, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unfavorable large-scale application, complex preparation process, high cost of raw materials, etc., and achieve high catalytic activity and stability, the preparation method is simple, and the effect of low cost

Pending Publication Date: 2021-09-03
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art represented by the above-mentioned catalysts, composite catalysts are mostly used for catalytic ozone oxidation, and metal oxides are dispersed by carriers, thereby improving catalytic activity and reducing metal usage; however, the supported catalysts in the prior art have low activity and stable Poor performance, complex preparation process, high cost of raw materials, unfavorable for large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A kind of composite catalyst and preparation method thereof, concrete preparation steps are as follows:

[0061] Immerse activated carbon in manganese nitrate aqueous solution, so that the mass ratio of manganese in manganese nitrate to activated carbon is 5:100; use equal volume impregnation method to impregnate at room temperature for 12h, and then dry at 110°C for 12h; place the dried sample In the tube furnace, under the protection of nitrogen, the temperature was raised to 500 ° C for 3 h; then ammonia gas was continuously passed into the tube furnace at a rate of 100 mL / min, and the composite catalyst was obtained by roasting at 500 ° C for 3 h.

[0062] In the composite catalyst, based on the mass of activated carbon (carbon-based material) as 100%, the mass of manganese is 5%, and the doping amount of nitrogen element is 5%.

Embodiment 2

[0064] A kind of composite catalyst and preparation method thereof, concrete preparation steps are as follows:

[0065]Immerse activated carbon in a mixed aqueous solution of manganese nitrate and copper nitrate, the molar ratio of metal manganese and metal copper in the mixed aqueous solution is 2:1, and the mass ratio of the total mass of manganese and copper to activated carbon is 20:100; The method was impregnated at room temperature for 12 hours, and then dried at 105°C for 20 hours; the dried sample was placed in a tube furnace, protected by nitrogen, and heated to 500°C for 3 hours; Ammonia gas was introduced into the medium, and calcined at 900°C for 3 hours to obtain a composite catalyst.

[0066] In the composite catalyst, the mass of activated carbon (carbon-based material) is 100%, the total mass of metal is 20%, the mass of manganese is 12.7%, the mass of copper is 7.3%, and the doping amount of nitrogen element is 6.4%. %.

Embodiment 3

[0068] A kind of composite catalyst and preparation method thereof, concrete preparation steps are as follows:

[0069] Immerse activated carbon in a mixed aqueous solution of lanthanum nitrate and cobalt nitrate, the molar ratio of metal lanthanum and metal cobalt in the mixed aqueous solution is 1:1, and the mass ratio of the total mass of lanthanum and cobalt to activated carbon is 10:100; using equal volume impregnation The method was impregnated at room temperature for 12 hours, and then dried at 110°C for 12 hours; the dried sample was placed in a tube furnace, and ammonia gas was continuously fed into the tube furnace at a rate of 200 mL / min, and roasted at 800°C for 6 hours. A composite catalyst is obtained.

[0070] In the composite catalyst, the mass of activated carbon (carbon-based material) is 100%, the total mass of metal is 10%, the mass of lanthanum is 6.3%, the mass of cobalt is 3.7%, and the doping amount of nitrogen element is 8.0%.

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Abstract

The invention provides a composite catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: loading a metal oxide and a doped nitrogen element on a carbon-based material to obtain the composite catalyst, wherein a nitrogen-doped nitrogen-containing precursor is ammonia gas and / or inorganic ammonium salt. According to the composite catalyst, more catalytic active sites are constructed by loading the metal oxide and doping the nitrogen element, and the metal oxide is partially reduced in the nitrogen doping process to form oxygen vacancy, so that the composite catalyst has higher catalytic activity and stability, ozone oxidation is efficiently catalyzed, and the catalytic activity of the composite catalyst is improved. And the efficiency of producing hydroxyl radicals through catalytic ozonolysis is improved. The composite catalyst is simple in preparation method, low in cost, suitable for large-scale application, high in efficiency in catalytic ozonation treatment of wastewater, stable and long in service life, can mineralize organic matters in the wastewater into carbon dioxide and water in a non-selective manner, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials, and in particular relates to a composite catalyst and its preparation method and application. Background technique [0002] With the continuous and stable economic growth, the scale of industrial production is expanding day by day, so a large amount of industrial wastewater, waste liquid, and municipal sewage with more complex components are generated; if they are not treated properly, they will affect the quality of the water environment and the health of residents. pose a serious threat. In particular, toxic organic pollutants in wastewater are highly toxic and difficult to treat, which is the focus and difficulty of wastewater pollution control. Organic pollutants in wastewater are generally removed by separation or reaction. The separation process includes extraction, adsorption, membrane separation, etc., to enrich or transfer organic matter to other liquid phases or solid surfa...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/02B01J37/08C02F1/72C02F1/78
CPCB01J37/088B01J37/0201B01J27/24C02F1/725C02F1/78Y02A50/20
Inventor 曹宏斌谢勇冰段锋
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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