Abstract
Hierarchically porous (HP) zeotype materials (possessing both micropores and mesopores) offer improved diffusional access to intra-framework active sites, analogous to mesoporous materials, yet retain the high selectivity of the microporous (MP) bulk. We have recently designed crystalline hierarchically porous silicoaluminophosphates (SAPOs) with enhanced mass-transport characteristics, which can lead to significant improvement in catalytic activity and catalyst lifetime. In this study, we have prepared PdAu bimetallic nanostructures supported on HP-SAPO frameworks by an incipient impregnation of metal precursors followed by H2 reduction at 300 °C, for the aerobic oxidation of benzyl alcohol to benzaldehyde. PdAu NPs supported on HP framework displayed significantly enhanced catalytic activities, when compared with their MP analogues, clearly highlighting the benefits of introducing hierarchical porosity in the SAPO support matrix.
Highlights
Introduction for Aerobic Oxidation of BenzylThe pioneering research work by Haruta et al led to the discovery of Au NPs as an active catalyst in oxidation reactions at relatively low temperatures [1,2]
The Hierarchically porous (HP)-SAPO-5 support material was synthesised by a one-pot soft templating strategy in which a mesporogen; DMOD, was used in combination with a microporous structuredirecting agent, triethylamine (TEA) [38]
The synthesis and design strategy of HP-SAPO-5 and MP-SAPO-5 support materials was confirmed by N2 physisorption analysis
Summary
Introduction for Aerobic Oxidation of BenzylThe pioneering research work by Haruta et al led to the discovery of Au NPs as an active catalyst in oxidation reactions at relatively low temperatures [1,2]. The oxide supported bimetallic catalysts, in particular the combination of Pd and Au, has been recognised for its highly active and selective oxidation abilities in various important catalytic transformations by weakly adsorbing the reactants and products on its surface to form target molecules [24,25,26,29,30,31]. These bimetallic catalysts are advantageous because of their electronic interactions and due to the possible complex geometrical arrangements, charge transfer and interfacial stabilisation between Pd and Au atoms
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