Abstract
Platinum (Pt), palladium (Pd/PdO), and rhodium (Rh) decorated carbon nanotube (CNT) based catalysts were prepared, characterized and their activity was tested in ammonia (NH3) and ethanol (EtOH) assisted selective catalytic reduction (SCR) of nitric oxide (NO) at low temperatures (30–300 °C). In addition, the influence of sulphur on NH3-SCR activity was investigated. The catalysts were characterized by transmission and scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray diffraction techniques. In addition, IR measurements were done to determine the adsorbed species on the catalyst surface. The maximum NO conversions over the catalysts were as high as 85 % for Pt/CNT (at 192 °C), 54 % for Pd/PdO/CNT (at 291 °C), and 48 % for Rh/CNT (at 292 °C) with NH3 as the reducing agent. The SO2 deactivation was the most severe in the case of Pd/PdO/CNTs. In the EtOH assisted SCR the maximum NO conversions were 100 % for Pt/CNT, 98 % for Pd/PdO/CNT and 85 % for Rh/CNT.
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Acknowledgments
This work has been carried out with the financial support from Fortum Foundation, the Academy of Finland (Project Number 128783), and Graduate School in Chemical Engineering (GSCE). The authors would also like to thank D.Sc.(Tech.) Tao Hu for running the XRD analyses, M.Sc. Elina Pulkkinen for preparing the KBr pellets and helping with the IR measurement, and M.Sc.(Eng.), M.Sc.(Health Sci.) Mari Pietikäinen for help with the EtOH-SCR experiments.
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Valtanen, A., Huuhtanen, M., Rautio, AR. et al. Noble Metal/CNT Based Catalysts in NH3 and EtOH Assisted SCR of NO. Top Catal 58, 984–992 (2015). https://doi.org/10.1007/s11244-015-0467-9
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DOI: https://doi.org/10.1007/s11244-015-0467-9