Metal Exchanged ZSM-5 Zeolite Based Catalysts for Direct Decomposition of N 2 O
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Metal Exchanged ZSM-5 Zeolite Based Catalysts for Direct Decomposition of N2O Suresh Kumar Æ S. Rayalu Æ Nunzio Russo Æ G. S. Kanade Æ H. Kusaba Æ Y. Teraoka Æ Nitin Labhsetwar
Received: 18 April 2009 / Accepted: 8 July 2009 / Published online: 28 July 2009 Ó Springer Science+Business Media, LLC 2009
Abstract Co?Pt/ZSM-5 and Ag?Pt/ZSM-5 type catalysts were prepared by ion exchange method followed by calcination. These Co and Ag based catalysts, promoted by a small amount of Pt have been studied for their catalytic activity towards N2O decomposition. Both the catalysts show high catalytic activity, however, cobalt–platinum based catalyst shows relatively better activity at higher temperature. At 550 °C almost 100% conversion of N2O is achieved over Co?Pt/ZSM-5 with a maximum of 0.08479 mmole of N2O decomposed per gram of the catalyst per unit time. These catalytic materials have been characterized for their structure, composition, morphology and other details, using XRD, SEM, EDX, ICP, BET techniques. Much improved catalytic activity for the bimetallic zeolite than the mono-metal containing compositions clearly demonstrate the synergistic effect of these transition metals, while high surface area of ZSM-5 is also responsible for the improved N2O decomposition activity. Keywords N2O decomposition Catalyst Zeolite ZSM-5 de-NOx Co?Pt/ZSM-5 Ag?Pt/ZSM-5
S. Kumar S. Rayalu G. S. Kanade N. Labhsetwar (&) National Environmental Engineering Research Institute (C.S.I.R.), Nehru Marg, Nagpur 440020, India e-mail: [email protected] N. Russo Materials Science and Chemical Engineering Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy H. Kusaba Y. Teraoka Department of Energy and Material Sciences, Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
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1 Introduction Control of N2O emissions has become one of the major challenges in environmental protection. N2O is a potential contributor to the green house gases with its global warming potential (GWP) as high as 310 [1]. Different methods reported for the N2O decomposition at the tail gas of industries includes thermal decomposition, selective catalytic reduction and catalytic decomposition. Thermal decomposition is an energy intensive method. Direct decomposition of N2O and selective catalytic reduction of N2O with hydrocarbons (HC-SCR) are extensively investigated as potential cost-effective technologies to remove nitrous oxide from industrial off-gases. Direct catalytic decomposition of N2O is a relatively simple method to convert nitrous oxide in to harmless products of N2 and O2. It is generally believed to be more cost-effective than HC-SCR as hydrocarbons are not often present on-site and an external supply of hydrocarbons is expensive, while catalytic reduction conventionally using ammonia involves the risk of reactant slip and unwanted combustion products. It is also associated with high cost for reductant introduction. Though, many catalysts have been studied for direct dec
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