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Facile synthesis of highly disperse Ni-Co nanoparticles over mesoporous silica for enhanced methane dry reforming


A synergistic approach has been made to develop a highly stable and carbon resistant catalyst system based on Cobalt and Nickel supported over modified mesoporous silica for dry methane reforming (DRM). Modified mesoporous silica is prepared by the hydrothermal method, and Co/Ni ratio is adjusted between 0-5 by using the deposition-precipitation technique. CO2 reforming with methane has been performed at 400-800 ℃ under atmospheric pressure as well as a pressure of 1 MPa keeping CH4/CO2 ratio equal to unity. The catalyst assembly before and after the reaction has been thoroughly characterized by a wide range of analytical techniques including N2 physisorption, XRD, TPR, TPO, TPH, XPS, SEM, TEM, Elemental mapping, TG-DTG, Physicochemical characterization results confirmed, the homogeneous distribution of nanosized metal particles into the hexagonal framework of modified silica, which plays a vital role towards stronger metal support interaction that renders carbon deposition upon the active metal surface as well as avoid metal sintering at higher temperature. At the same time, the coexistence of nanosized Co and Ni into the mesopores produce a synergy which provides better stability without any deactivation at high pressure reaction condition. In-situ DRIFT analysis evidenced the reaction proceeds over these catalysts through an initial pathway in which both methane and carbon dioxide initially dissociated over the metal along with a bifunctional pathway in which methane dissociated over the active metal and carbon dioxide activated over the basic support surface via a formate intermediate. Density Functional Theory (DFT) calculations have also further supports the proposed mechanism from DRIFT studies.

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Publication details

The article was received on 26 Dec 2017, accepted on 03 Mar 2018 and first published on 12 Mar 2018

Article type: Paper
DOI: 10.1039/C7NR09625A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Facile synthesis of highly disperse Ni-Co nanoparticles over mesoporous silica for enhanced methane dry reforming

    S. Das, M. Sengupta, A. Bag, M. Shah and A. Bordoloi, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR09625A

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