Abstract
Novel catalysts were successfully obtained using hybrid composite silica-based mesoporous materials MCM-41 type LUS and Pd(II) complexes. The metal site localization was controlled using two different synthetic routes, namely in situ functionalization and post-grafting synthesis (ex situ synthesis). These materials were characterized by XRD, FT-IR, EPR, N2 physisorption, TEM, SEM and H2 chemisorption. The catalytic performance was investigated on methane combustion reaction under CH4/O2/He (1/4/95 vol%) continuous flow at temperature below 450 °C. It has been proved that the palladium complex is embedded inside the mesostructured walls for the materials synthesized by the in situ method; while it is grafted at the wall surface for the one resulted from ex situ path. The latter material performed the best catalytic activity at temperatures below 450 °C thanks to a better dispersion of smallest PdO nanoparticles that optimizes the accessibility of the reactants to the actives sites in the mesoporous channels.
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Zribi, S., Zina, M.S. Palladium complex-based catalysts stabilized on mesostructured silica: reactivity in methane combustion. Reac Kinet Mech Cat 118, 577–592 (2016). https://doi.org/10.1007/s11144-016-0987-8
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DOI: https://doi.org/10.1007/s11144-016-0987-8