544114 Selective Oxidation of Methane to Oxygenates in Aqueous Hydrogen Peroxide Using Bimetallic Au-Pd Supported By Different Nanostructured Materials

Wednesday, June 5, 2019
Texas Ballroom Prefunction Area (Grand Hyatt San Antonio)
Saeed Alshihri, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia

Selective Oxidation of Methane to Oxygenates in Aqueous Hydrogen Peroxide using bimetallic Au-Pd supported by different nanostructured materials

Saeed Al-Shihria*, Christian Richardb, Hamid Al-Megrena, David Chadwickb

a National Petrochemical Technology Center, Materials Science Research Institute, King Abdulaziz City for Science and Technology (KACST), P. O.Box6086,Riyadh11442,SaudiArabia

bImperial College London, Chemical Engineering, London, UNITED KINGDOM

*Corresponding author: alshihri@kacst.edu.sa,

Key words: methane oxidation, Gold-palladium, Nanostructured catalysts, methanol, catalysis.

The direct selective oxidation of methane in aqueous hydrogen peroxide solution has been investigated using four different supported Au/Pd catalysts. The following supports: titanium oxide (anatase), cerium oxide (nanoparticles), titanate nano tubes (TiNT) and ceria nanorods (CNR), were all used and their influence on the product distributions of MeOOH and MeOH evaluated. The catalysts have been characterized by a range of techniques including: XRD, XRF, BET, TEM. The reaction was carried out in a purpose-made glass liner reactor and the liquid was stirred using a glass-coated magnetic bar to minimize the possibility of metal leaching into solution from reactor components. Au-Pd over ceria nanorods (CNR) was found to be the most effective catalyst, and the main product to be formed was formic acid, which is not in agreement with a previous work. In comparison to ZSM-5(50) catalysts (total productivity was 24.4 mol kgcat-1h-1) reported in our previous study [1], the productivity is low which could be due to the high decomposition of H2O2 over Au-Pd.

[1] S. Al-Shihri, C.J. Richard, D. Chadwick, ChemCatChem 9 (2017) 1276–1283.

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