Download Synthesis and Characterization of Ru Nanoparticles Immobilized

Synthesis and Characterization of Ru Nanoparticles Immobilized TiO2: A Highly Efficient
Catalytic System for the hydrogenation of CO2 to Formic acid
Praveenkumar Upadhyay, Vivek Srivastava*
Basic Sciences: Chemistry, NIIT University, NH-8 Jaipur/Delhi Highway, Neemrana (Rajasthan) Pin
Code: 301705, Contact Number: +91-1494302423, email id: [email protected]
Abstract
Metal nanoparticles have attracted much consideration over the last decade owing to their exclusive
physiochemical properties as compared to their bulk metal equivalents such as a large surface-to-volume
ratio and tunable shapes and size. Supported metal nanoparticles are widely employed in catalysis to
speed up the chemical reaction rate.1 Recent developments in regulatory the shape and size of
nanoparticles have unlocked the new opportunity to optimize the particle geometry for improved catalytic
activity, providing the optimum size and surface properties for precise applications.2 This report defines
the state of the art with respect to the preparation and use of supported metal nanoparticles in catalysis.
In this approach, TiO2 was used as a support to accommodate Ru nanoparticles, as TiO2 offers wide
chemical stability and a non-stoichiometric phase. TiO2 also counts as a good acidic support and its
anatase phase provides a better surface area in order to achieve good catalytic properties.2-4 We also
utilized the applications of task specific ionic liquid, not only as reaction medium but also to recover
formic acid.5. 6 Such advance application of ionic liquid mediated Ru/Ti catalytic system offered the
hydrogenation reaction in a more optimized way to achieve maximum selectivity (high TON/TOF value
of formic acid) with the added advantages of low catalyst loading and eight times catalyst recycling
(Scheme 1).
CO2 (g) + H2 (l)
Ru-TiO2 catalyst, IL
50-100oC, 2-7h
HCOOH (l)
TON= 420-19052
TOF= 84-3810
Scheme 1. Selective hydrogenation of CO2 gas
References
[1] J. M. Campelo, D. Luna, R. Luque, J. M. Marinas, A. A. Romero, CHEMSUSCHEM, 2009, 2, 18-45.
[2] S. Schauermann, N. Nilius, S. Shaikhutdinov,H.-J. Freund, Acc. Chem. Res., 2013, 46 (8), 1673–1681.
[3] S. Bagheri, N. M. Julkapli and S. B. A. Hamid, The Scientific World Journal, 2014, 2014, 1-21.
[4] Zhao J, Ma L, Xu L-X, Feng F, Li X-N, Chin Chem Lett 25 (2014) 1137
[5] Dupont J and Scholten J D, Chem. Soc. Rev. 39 (2010) 1780.
[6] Srivastava V, Catalysis Letters 144 (2014) 1745.