Catalysis at the nanoscale supported on Ultrafine titanium dioxide

S. Augustine
Cristal USA, US

Keywords: nanoparticle synthesis and applications

Summary:

The sulfate manufacturing process has been used to produce industrial quantities of titanium dioxide pigments for the past 100 years. In the early 80’s it was discovered that this same process can be modified to produce high surface area, nanocrystalline anatase as a support for vanadia-tungsta DeNOx catalysts. Later it was shown that high surface area anatase is also effective in the Claus process to convert H2S to merchant grade sulfur. Despite the widespread success shown by these practical uses, there has been limited industrial application of ex-sulfate anatase titania beyond environmental catalysis. Cristal’s research is showing that the sulfate-based titania is an ideal support for both petrochemical and new concept DeNOx catalysts. Advantages include the unique anatase morphology as well as, quite surprisingly, the presence of surface sulfate groups that act as promoters that improve performance – even in the cases when used to support ceria or precious metals.