Kinetic study for low-temperature SCR of NO with NH3 over Mn-Ce/TiO2 catalyst

摘要

In this paper, the Mn-Ce/TiO2 catalyst prepared by co-precipitation, study the low temperature performance of selective catalytic reduction (SCR) NO of catalyst within the temperature range 333∼433K with NH3 in presence of excess O2. Under ideal conditions, the study shows that when ratio of molar of catalyst Mn/(Mn+Ce) reach to 0.7, low temperature selective catalytic activity of catalyst will be the best. NO will be removal in more than 90% at 393K. Through steady-state kinetic experiments, the reaction of low temperature SCR of Mn-Ce/TiO2 catalyst is found to NO, NH3, O2 reaction order were 1, 0,0.5. By calculating, the activation energy of reaction of Mn-Ce/TiO2 catalyst is 40kJ/mol, which is lower than most of the reported activation energy of the catalyst reaction.