Synergetic Promotional Effects Between Cerium Oxides and Manganese Oxides for NH3-Selective Catalyst Reduction Over Ce–Mn/TiO2
Ce and Mn codoped Ce–Mn/TiO2 catalysts were synthesized by sol–gel method and were used as model catalysts to investigate the synergetic promotional effects between cerium oxides and manganese oxides for selective catalytic reduction of NO by NH3 . The catalysts were characterized by SEM, XRD, XPS, and temperature-programmed hydrogen reduction (H2-TPR) and ammonia desorption (NH3-TPD) techniques. The experimental results showed that cerium oxides and manganese oxides affected each other, and their catalystic activities improved both at low and high temperatures. The catalysts yielded more than 90% NO X conversion in the temperature range 250–450 C and W/F of 0.00125 g min mL–1 (W/F represents the ratio of the catalyst weight to the gas flow rate). It was suggested that the mobility of oxygen species enhanced through the sandwiched structure -Mn–O–Ce ( represents the oxygen vacancy), leading to the enhancement of the NO X conversion over Ce–Mn/TiO2 significantly. Moreover, the Ce and Mn codoping improved the acid concentration with both medium acid sites and strong acid sites. Ce doping inhibited the growth of crystal size of TiO2, while Mn doping had little influence on it.
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Document Type: Research Article
Publication date: June 1, 2011
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