287414 Nickel-Doped Mn/TiO2 As an Efficient Catalyst for the Low-Temperature SCR of NO with NH3: Catalytic Evaluation and Characterizations

Thursday, November 1, 2012: 2:30 PM
315 (Convention Center )
Thirupathi Boningari1, Arpad Somogyvari2 and Panagiotis Smirniotis1, (1)Chemical Engineering Program, School of Energy, Environmental, Biological and Medicinal Engineering, University of Cincinnati, Cincinnati, OH, (2)Catalyst Elements, Cummins Emission Solutions, Columbus, IN

The current technology for post-combustion removal of NO is the selective catalytic reduction (SCR) of NO at medium to high temperatures. Industrially adopted catalysts and the existing commercial catalytic system suffers from the drop of N2 selectivity at high temperatures (573-673 K), high conversion of SO2 to SO3, need to reheat the stack gas. The development of low-temperature SCR catalysts working at 150–250 °C would be the great resolution to avoid all the problems associated with the existing commercial catalytic system. For this purpose, we have prepared a series of titania-supported manganese-nickel catalysts by adopting a solution-impregnation method and evaluated for the low-temperature SCR of NO with NH3 by varying Ni/Mn atomic ratio. Rationale for the best activity of our catalyst is investigated by various physico-chemical techniques such as XRD, N2 physisorption, oxygen chemisorption, H2-TPR, and XPS spectroscopy. XPS results illustrated extremely dominant MnO2 phase over the Mn2O3 phase (Mn4+/Mn3+=96%), and high Mn4+/Ti ratio in the Mn-Ni(0.4)/TiO2 catalyst. TPR results revealed that the addition of nickel oxide to titania-supported manganese results in stabilization of the former in the form of MnO2, which is reduced at lower temperatures, compared to Mn2O3. Structural, elemental characterizations and the catalytic performance of the materials will be discussed in the presentation.

Extended Abstract: File Not Uploaded