Fabrication of gamma-MnO2-Ce Pillared Montmorillonite for Low Temperature NH3-SCR

A series of gamma-MnO2-Ce/MMT catalyst materials synthesized by homogeneous precipitation method was investigated for the selective catalytic reduction (SCR) of NOx with NH3. X-ray diffraction and specific surface areas were utilized for micro structure and layer spacing investigation. And NH3-TPD, Pyridoxine IR, H-2-TPR and XPS were used to investigate Bronsted acid and Lewis acid, redox properties, atomic concentrations and element chemical state for as-prepared catalysts. The results showed that the gamma-MnO2-Ce/MMT had superior NOx conversion compared to the bulk particles, among which 6 wt.% gamma-MnO2-Ce/MMT displayed the best deNO(x) of 95.3% for the low temperature selective catalytic reduction of NO with NH3 (NH3-SCR) under the GHSV of 25,000 h(-1), therefore it is a promising catalyst for low temperature NH3-SCR.