Experimental study on a low-temperature SCR catalyst based on MnOx/TiO2 prepared by sol-gel method

A catalyst based on MnOx/TiO2 was prepared by sol-gel method for low-temperature selective catalytic reduction (SCR) of NO with NH3. Focusing on the effects of the operating parameters, the SCR reaction was investigated at temperatures from 353 to 523 K under steady and transient states. Under the optimal conditions, the efficiency of NO removal could exceed 90% at temperature of 423 K. Furthermore, within the range investigated, the reaction order of NO, NH3, O-2 was determined to be 1, 0, and 0.5, respectively. Apparent activation energy was also calculated to be 38 kJ/mol, lower than that for most of the catalysts reported by previous investigations. (c) 2006 Elsevier B.V. All rights reserved.