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Preparation of Supported Nanocatalyst and its Application in Organic Reactions - 2018 Course Fees, Prospectus, Admission Entrance Form, Exam Form, Scholarship Form, Download Syllabus, Result, Admission Process, Admission Last Date, Contact Full Detail, Campus Address, Jobs Scope

Preparation of Supported Nanocatalyst and its Application in Organic Reactions By Dr Vinay S. Sharma, Assistant Professor, Madhav University Sirohi Rajasthan

Function of Nanocatalyst in Chemistry of Organic Compounds, Applications of nano-catalyst in new era, Sustainable Nanocatalysts for Organic Synthetic Transformations, Preparation of NiO Nanocatalyst Supported on MWCNTs and Its Application in Reduction of Nitrobenzene to Aniline in Liquid Phase, Preparation of Supported Nanocatalyst and its Application in Organic Reactions By Dr Vinay S. Sharma Assistant Professor Madhav University Sirohi Rajasthan

Preparation of Supported Nanocatalyst and its Application in Organic Reactions

Metal Nanoparticles 

A nanoparticle is generally defined as a particle which has at least one of its dimensions in the range of 1 to 100 nm. They have exhibits different properties as compared to their bulk metals which are due to degenerated density of energy states and a large surface to volume ratio. These impart remarkable chemical activity and specificity of interaction to nanoparticles and so, it is not surprising that the interest in nanoparticles has experienced a staggering exponential increase. Their successful utilization in broad research area such as electronics, biochemical sensors, catalysis and energy. The amplitude of research efforts is likely to increase as beneficial applications at the nano-level become increasingly apparent. They (NPs) have extended the limitation of technology in ways that the researcher had never dreamed a century ago [1-2].

In the last several years, nanoparticles have appeared as sustainable alternatives for conventional catalysts. The catalytic activity of nanoparticles represents a rich resource for chemical processes, employed both in industry as well as in academia. Nanoform enhances the exposed surface area of the catalyst, thereby enhancing the contact between reactants molecules and catalyst dramatically and thus mimicking homogeneous catalysts. However, isolation and recovery of these tiny nanocatalysts from the reaction mixture is very difficult. In addition, nanoparticles are very small and in a thermodynamically unstable state. To overcome these problems, the use of supported metal nanoparticles has emerged as a viable solution as their insoluble nature enables easy and efficient separation  like heterogeneous catalysts from the liquid or gas phase reaction medium. It should be emphasized that the nanocatalysts are bridging the gap between the homogeneous catalysis and heterogeneous catalysis. Moreover, the activity as well as the selectivity of nanocatalyst can be further manipulated by tailoring the chemical and physical properties such as particle size, shape, composition and morphology [3-4].

Supported Metal Nanocatalyst (Heterogeneous Catalyst)

Supported catalysts are broadly used in industrial-scale oxidation and hydrogenation reactions and have been shown to display good catalytic performance coupled with easy separation and recyclability. Best example is that of palladium supported on charcoal. There are several aspects that stimulus the catalytic performance of supported catalysts, including the particle size, composition, surface morphology and structure of the active phase, the nature of the support, as well as interaction between the active phase and the support [5].  Supported nanocatalysts are sustainable alternatives to conventional homogeneous catalysts as they combine the easiness of separation from the liquid reaction mixture and shows excellent catalytic activity and reusability. It is most challenging to achieve homogenous distribution of metal nanoparticles with approximately uniform size on different kind of supports materials.  A lot of research is being done to find new supports which can fulfil all the prospects of a good catalyst [6]. 

Type of Supports Material

    A porous material that is generally used as support for the metal stabilization is a solid composed of an interconnected network of pores (voids). Many natural and synthetic materials such as carbon materials (graphene, graphene oxide, carbon nanotube, carbon nanospheres, activated carbon, graphitic carbon nitride), resins, magnetic materials, zeolites, polymers, proteins, MOFs, dendrimers, metal oxides, biological materials, clays, have been successfully applied as support material for stabilization of nanoparticles. The biggest advantages associated with that are to control the particle size and retard for the aggregation. One of the most important features of metal nanocatalyst is the dependence of its activity on the size and morphology of nanoparticles and thus, supports play a crucial role in the activity of catalyst. Supported nanocatalyst based materials are key in most of  synthetic orgaic  transformations due to their avantages.

    References  

        • G. A. Ozin, A. C. Arsenault, L. Cademartiri, Nanochemisty: A chemical Approach to Nanomaterials, RSC, Cambridge, UK, 2000
        • M. Chen, Y. Cai, Z. Yan, G. A. Goodman, J. Am. Chem. Soc., 2006, 128, 6341-6346.
        • R. S. Varma, Green Chem., 2014, 16, 2027-2041.
        • A. S. Sharma, D. Shah and H. Kaur, RSC Adv., 2015, 5, 42935.
        • V. Polshettiwar, R. Luque, A. Fihri, H. Zhu, M. Bouhrara, J. M. Basset, Chem. Rev., 2011, 111, 3036-3075.
        • A. Maity, V. Polshettiwar, Chem Sus Chem., 2017, 10, 3866– 3913.
        • V. Polshettiwar, T. Asefa, Nanocatalysis: Synthesis and Applications, John Wiley Publication, 2013.
        Courtesy:
        Dr Vinay S. Sharma, Associate Professor
        Madhav University Sirohi Rajasthan

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