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An investigation into the properties of V-based catalysts for Selective Catalytic Reduction of NO with NH3

Xiao, Y. and Liang, T. and Zhou, P. (2012) An investigation into the properties of V-based catalysts for Selective Catalytic Reduction of NO with NH3. Proceedings- Institute of Marine Engineering Science and Technology Part a Journal of Marine Engineering and Technology, 11 (1). pp. 25-34. ISSN 1476-1548

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Selective catalytic reduction (SCR) is the most potential method for removing marine NOx emissions by up to 95%. This paper presents the results of an investigation using vanadium (V) based catalysts doped by metals W (tungsten), Ce (cerium) and Ni (nickel) to improve the low temperature performance of an SCR for NOx reduction. The temperature range studied was between 100-450°C with intervals of 100°C. A honeycomb ceramic substrate was modified by composite sol and coated with the catalysts. The study also included preparation, characterisation and activity tests of the selected catalysts, including studying the activity of the catalysts in ammonia selective catalytic reduction reaction with an excess of oxygen concentration. The investigation verifies that a mixture of the above metallic catalysts exhibit high activity for selective catalytic reduction of NOx with ammonia. Among all the catalysts studied, the mixed catalyst of Ni-Ce-W-V is the most potential one, not only because of its higher NOx conversion rate at low temperature, but also because of its wider window of operation temperature.