Preparation method of catalyst for catalytic oxidation of ammonia (NH3)

Abstract

The invention discloses a method for preparing a catalyst that catalyzes the oxidation of ammonia (NH3), and belongs to the field of environmentally friendly catalysis technology. The chemical vapor deposition method is used to prepare a nanocomposite carrier of titanium dioxide and carbon (TiO2-C), and the active component is a transition metal. Copper and cobalt, the active components are loaded onto the TiO2-C composite carrier through ultrasonic impregnation. The raw materials used in the present invention are non-toxic, harmless and cheap, and the catalyst has good low-temperature catalytic activity, stability and product selectivity. Using this The catalyst prepared by the method can effectively realize low-temperature selective catalytic oxidation of NH3. The catalytic products are N2 and H2O, without secondary pollution, and can be widely used to treat NH3-containing waste gas generated in industry, agriculture, construction and other processes.

Description

technical field [0001] The invention relates to a catalytic oxidation of NH 3 The preparation method of the catalyst belongs to the field of environment-friendly catalytic technology. Background technique [0002] With the improvement of the quality of life, people's environmental comfort and their own health awareness have been greatly improved. Stench is one of the seven major public hazards recognized in the world. my country's "Air Pollution Prevention Law" and GB 14554-1993 Odor Pollutant Emission Standards for NH 3 Regulations on limited discharge have been made (standard value of odor pollution factory boundary discharge: NH 3 The primary, secondary, and tertiary emission standard values ​​are 1.0 mg / m3 3 , 1.5 mg / m 3 , 4.0 mg / m 3 ); my country's "Industrial Enterprise Design Hygienic Standard" (TJ36-79) stipulates the maximum allowable concentration of harmful substances in the atmosphere of residential areas, NH 3 The primary value is 0.20 mg / m 3 ;NH 3 The st...

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Problems solved by technology

[0004] CN101966451A discloses a selective catalytic oxidation of NH 3 The preparation method and application of the nano-cerium-zirconium solid solution-based catalyst, the carrier of the catalyst prepared by the method is a cerium-zirconium solid solution, the active components are copper, silver, manganese, iron, etc., the carrier is prepared by cationic surfactant method, and the active components are passed through Deposition-precipitation method or impregnation method loaded on cerium-zirconium solid solution, the catalyst has better oxidation activity, NH 3 The conversion rate is 100% at 280°C, but the conversion temperature is high, the preparation process is complicated, and the active component contains precious metals, so the cost is high

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