Experimental study on a low-temperature SCR catalyst based on MnO x/TiO 2 prepared by sol–gel method

Abstract

A catalyst based on MnO x /TiO 2 was prepared by sol–gel method for low-temperature selective catalytic reduction (SCR) of NO with NH 3. 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, NH 3, 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.