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Steric Effects of Mesoporous Silica Supported Bimetallic Au-Pt Catalysts on the Selective Aerobic Oxidation of Aromatic Alcohols

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College of Chemical Engineering, Nanjing Forestry University, No. 159 Longpan Road, Nanjing 210037, China
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Department of Chemistry, School of Science, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
3
Biomass Energy Engineering Research Center, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1192; https://doi.org/10.3390/catal10101192
Received: 21 September 2020 / Revised: 7 October 2020 / Accepted: 9 October 2020 / Published: 15 October 2020
Three series of catalysts consisting of gold (Au), platinum (Pt), or gold-platinum bimetallic nanoparticles (NPs) with controlled sizes (Au NPs 10 ± 2 nm, Pt NPs 6 ± 2 nm) anchored on hierarchical micro-/meso-/macroporous silica were successfully developed and systematically evaluated for the selective oxidation of aromatic alcohols to their corresponding aldehydes. The catalysts were prepared by the sol-immobilization method using as-made Au NPs and/or Pt NPs colloids; the silica supports were prepared with controlled pore structures and the hierarchical porous structures of catalysts were created by controllable desilication via the alkaline solution of the metal colloids. The catalysts were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS), and Inductively Coupled Plasma-Mass Spectrometry (ICP-MS), and these results showed no synergistic effect between Au and Pt on boosting the catalytic performance, whereas they demonstrated a clear dependence of catalytic conversions and reaction rates on the structural porosity of Au-Pt bimetallic catalysts. Our findings could potentially inspire peer researchers and scientists to develop designer porous catalysts and processes in the selective organic conversions. View Full-Text
Keywords: steric effect; Au-Pt catalysts; alcohol oxidation; hierarchical porous silica steric effect; Au-Pt catalysts; alcohol oxidation; hierarchical porous silica
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Yan, J.; Shan, L.; Gu, X.; Zhang, X.; Cai, J. Steric Effects of Mesoporous Silica Supported Bimetallic Au-Pt Catalysts on the Selective Aerobic Oxidation of Aromatic Alcohols. Catalysts 2020, 10, 1192.

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