Titanium is a silvery-white transition metal, which is considered as a rare metal, with the properties of light-weight, high-strength, metallic luster, moisture chlorine corrosion; its most common compound is titanium dioxide, which is often used as the carrier of denitration catalyst. The typical plate denitration catalyst is based on stainless steel and coated with a catalyst paste (ingredients: titanium dioxide, vanadium pentoxide, tungsten trioxide and molybdenum trioxide, etc.).

 

Because of tungsten, molybdenum, vanadium and other metals and their compounds are usually expensive, for seeking a higher cost-effective, the researchers decided to start with the substrate of plate tungsten trioxide denitration catalyst to improve its property. Experiment has shown that metal titanium or its alloy can meet their demands. Compared to stainless steel, the titanium has a higher strength / weight ratio because of its light-weight, high-strength; when used as the catalyst substrate, it can cut off 1/2 of the weight with the remaining high strength, and loading the same amount of active substance while significantly reducing the weight of the SCR denitration system. Furthermore, since titanium also purchases according to the unit weight, which is to say the cost of the titanium substrate is approximately equal to that of the stainless steel substrate.

 

In addition, titanium based of tungsten trioxide plate denitration catalyst due to the choice of titanium plate with through-hole which makes the whole SCR system able of rapid heating and cooling, and quickly response to the changing conditions. Insiders know the most efficient temperature range of NOx removal reaction is very high and narrow; however, the titanium substrate can exactly effectively overcome this disadvantage. Also, if the catalyst is cracking or chipping, the exposed titanium will be oxidized to titanium dioxide by the oxygen in the high temperature of exhaust gas, which also contributes to the catalytic denitrification.