Abstract
A key catalytic challenge in the electro-conversion of methane (CH4) is to partially oxidize CH4 to liquid products under ambient environment. This paper describes the electrocatalytic activity of mesoporous rutile titanium dioxide (r-TiO2) nanorods (NRs) and Pt loaded mesoporous rutile TiO2 nanohybrids (Pt/r-TiO2) NRs prepared with the one step hydrothermal approach. The usefulness of this technique is to encapsulate Pt nanoparticles (NPs) and utilize this material in the liquid-phase oxidation of CH4. This electrocatalytic reaction of CH4 with Na2CO3 electrolyte was examined over highly active Pt/r-TiO2 NRs catalysts consisting of pure rutile phase TiO2 having enough loading amount (10 wt%) of metallic Pt NPs. The surface modification of r-TiO2 with Pt NPs promotes the activation of CH4 and •OH that can support to generate methyl radical (•CH3). Afterwards CH3OH (50 µmol/g catalyst⋅h) and C2H5OH (36 µmol/mg catalyst⋅h) including small amount of propanol products are formed along with H2 gas (0.1 ± 0.02 vol%) using Pt/r-TiO2 at 1.5 V vs. Ag/AgCl electrode. High-resolution transmission electron microscopy proves the existence of 4 to 8 nm spherical-shaped Pt NPs on r-TiO2 NRs. This research work should act as a template for the study and design of metal loaded mesoporous metal oxide nanohybrid catalysts for the C − H bond activation to liquid products.
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