Abstract
The intermediates and the mechanism of the SCR reaction of NO with NH3 on TiO2 sulfate have been studied by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), FT-IR and NH3-TPD. In the presence of ammonia on the surface, NO adsorbed as NO− species are enhanced and then oxidized to NO2 and NO3− by oxygen either from structure or NO. The formation of NO3− species perturbs the adsorption of protonated ammonia and induces its removal as N2 at 300°C. The result obtained from FT-IR shows that the NH3 species adsorbed on Lewis acid site remain as main species at high temperature. Accordingly, a Langmuir–Hinshelwood mechanism on Lewis acid site is suggested.
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