Hydrogenation of Alkenes with Rhodium Nanoparticles Supported on SBA-15
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Hydrogenation of Alkenes with Rhodium Nanoparticles Supported on SBA-15 Nayanmoni Bhorali • Jatindra Nath Ganguli
Received: 10 November 2012 / Accepted: 17 December 2012 / Published online: 9 January 2013 Ó Springer Science+Business Media New York 2013
Abstract Rhodium nanoparticles were prepared by chemical reduction of RhCl33H2O in presence of polyvinyl pyrrolidone and then immobilized on SBA-15 by impregnation. The catalyst was used for hydrogenation of unsaturated hydrocarbons at room temperature. The progress of the reaction was monitored by GC–MS and 100 % conversion was achieved in all cases. Keywords Mesoporous silicates Rh-SBA-15 Rhodium-nanoparticles Hydrogenation
1 Introduction The overall performance and activity of catalyst and selectivity are ruled by size and morphology of active metals [1–3]. Though metal nanoparticles with different sizes and morphologies have been synthesized, yet their successful application in catalysis is a big challenge for chemists. The main disadvantage in this regard is the possibility of agglomeration and sintering of the nanoparticles under drastic catalytic reaction conditions. Hence it is important to support the nanoparticles effectively on solid and stable materials which would prevent agglomeration and deactivation. Interest in the synthesis and properties of colloidal metal nanoparticles has been increasing because of their unique properties and applications as catalyst. Two main aspects in the synthesis of the metal colloid nanoparticles are to control the growth of metal nanoparticles in terms of particle size, particle size distribution and N. Bhorali J. N. Ganguli (&) Department of Chemistry, Gauhati University, Gauhati, Assam, India e-mail: [email protected]
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structure of the particle and the stabilization of the colloids. Among various techniques, chemical reduction techniques are important for the synthesis of nanoparticles, because these methods can be applied under simple and mild conditions and can also be used to prepare nanoparticles on a large scale [4]. Though transition metal nanoparticles act as good catalyst for many organic synthesis, the liquid suspensions of metal nanoparticles in catalysis is difficult to separate and recycle. Our work focuses on immobilization of metal nanoparticles on mesoporous solid support materials. Mevellec et al. [5] reported a synthetic method for preparation of rhodium nanoparticles by addition of silica to a pre stabilized rhodium aqueous colloidal suspension. Although Somorjai and coworkers [6] also reported synthesis of Rh nano particles and ethylene hydrogenation, their method is high temperature synthesis and the catalysis is also at high temperature and pressure, in comparison our method reported in this paper is simple, starting from RhCl3, room temperature synthesis of Rh nano particles and liquid phase heterogeneous hydrogenation of various alkenes at low pressure and room temperature.
2 Experimental: Materials and Methods Rhodium chloride hydrate was obtained from Arora Matthey, sod
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