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Gu T.,Zhejiang University | Jin R.,Environmental Science and Design Research Institute of Zhejiang Province | Liu Y.,Zhejiang University | Liu H.,Zhejiang University | And 2 more authors.
Applied Catalysis B: Environmental | Year: 2013

In this paper, the Ca doped MnOx/TiO2 catalysts were synthesized through a sol-gel method, which exhibited promoting effects on selective catalytic reduction (SCR) of NO with NH3 at low temperature. The NO conversion of MnOx/TiO2 had been greatly improved from ca. 40% to 90% at 140°C after Ca doping. After the catalysts being subjected to a variety of analytical measurements, we observed that the addition of Ca could result in better dispersion of MnOx on TiO2, leading to the enhancement of BET surface area and pore volume. This could be attributed to the strong interactions among calcium, manganese oxides and titania. Furthermore, an obvious increase in the amounts of ad-NOx species, especially monodentate nitrate and NO2 - species, was also observed. All of these would give the contributions to the great improvement of catalytic activity by the addition of Ca. © 2012 Elsevier B.V. Source


Jin R.,Zhejiang University | Jin R.,Environmental Science and Design Research Institute of Zhejiang Province | Liu Y.,Zhejiang University | Wang Y.,Zhejiang University | And 4 more authors.
Applied Catalysis B: Environmental | Year: 2014

Manganese-based catalysts have shown excellent low-temperature selective catalytic reduction (SCR) activity for NOx removal. However, they all suffer from the serious SO2 poisoning effect on activity. Ceria modification has been reported to be able to promote SO2 tolerance of SCR catalysts probably via the inhibition of surface sulfate species formation. In this study, in situ diffuse reflectance infrared transform spectroscopy (DRIFT) investigations were carried out to determine the role of Ceria in the improved resistance for a Ce-modified Mn/TiO2 catalyst. The results indicated that after the introduction of Ce, SOx ad-species preferentially formed on Ceria as bulk-like sulfate species and lessened the sulfation of the main active phase (MnOx) during low-temperature SCR processes in the presence of SO2. Furthermore, the DRIFT and TG-DSC results also implied that Ce modification could reduce thermal stabilities of the sulfate species covered on catalyst surface, thereby promoting its decomposition. Both of these would be beneficial to the improved SO2 tolerance of Ce modified catalysts. © 2013 Elsevier B.V. Source

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