Organic waste gas catalytic combustion equipment

The key to the reaction of organic waste gas catalytic combustion equipment is to choose the appropriate catalyst. The requirement for the catalyst is high activity, especially good low-temperature activity, in order to start the reaction at the lowest possible temperature. The combustion reaction is an exothermic reaction that releases a large amount of heat, which can cause the surface of the catalyst to reach a high temperature of 500-1000 ℃. However, the catalyst is prone to decrease activity due to melting, so it is required that the catalyst can withstand high temperatures.

Catalysts used for catalytic combustion can be divided into: ① Precious metals: platinum, palladium, ruthenium, etc. Precious metal catalysts have advantages such as high oxidation activity and easy recovery. Although they have disadvantages such as scarce resources, high prices, and poor toxicity resistance, they are still the main catalysts used by countries around the world. ② Non precious metals: mainly oxides of transition group elements and rare earth elements. Single component oxides such as copper oxide (CuO) and nickel oxide (NiO). Single component oxides have poor heat resistance and low activity, which limits their application. In the future, a mixture of two or more metal oxides will be used, such as manganese dioxide copper oxide (3:2) composite, iron oxide chromium oxide composite, copper oxide chromium oxide composite, cobalt manganese spinel composite, copper, manganese, nickel, zinc chromate, etc. Although composite oxides can improve certain catalytic properties, their oxidation activity is still inferior to that of precious metals. In addition, there are metal sulfides such as thorium, nickel, molybdenum, and cobalt sulfides. This type of catalyst is generally only suitable for catalytic combustion of sulfur-containing hydrocarbons, with a usage temperature limited to 300-400 ℃, and is prone to decomposition at high temperatures.

Active substances of catalysts

It is usually coated on a carrier, so its shape also varies depending on the carrier. The carrier includes spheres, cylinders, and various shaped bodies made of γ - Al2O3, porous ceramic honeycomb bodies covered with active alumina films on the surface, as well as expanded spheres and metal corrugated plates made of heat-resistant alloy wires. The carrier can reduce the amount of catalyst used and provide support. It should have characteristics such as large specific surface area, high temperature resistance, high mechanical strength, and low fluid resistance.