Surface protonics by applying electric field promotes low temperature methylcyclohexane dehydrogenation for effective hydrogen production.

The methylcyclohexane (MCH)-toluene cycle is a promising liquid organic hydride system as a hydrogen carrier. Generally, MCH dehydrogenation has been conducted over Pt-supported catalysts, for which it requires temperatures higher than 623 K because of its endothermic nature. For this study, an electric field was applied to Pt/TiO 2 catalyst to promote MCH dehydrogenation at low temperatures. Selective dehydrogenation was achieved with the electric field application exceeding thermodynamic equilibrium, even at 423 K. With the electric field, "inverse" kinetic isotope effect (KIE) was observed by accelerated proton collision with MCH on the Pt/TiO 2 catalyst. Moreover, Pt/TiO 2 catalyst showed no methane byproduction and less coke formation during MCH dehydrogenation. DRIFTS and XPS measurements revealed that electron donation from TiO 2 to Pt weakened the interaction between catalyst surface and p-coordination of toluene. Results show that the electric field facilitated MCH dehydrogenation without methane and coke by-production over Pt/TiO 2 catalyst. † Electronic supplementary information (ESI) available. See

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Oxidative coupling of methane (OCM) over La 1– x M x AlO 3−δ (M = Ca, Sr, Ba; x = 0, 0.1, 0.2, 0.3) in an electric field at low temperature (423 K) was investigated. Among the tested catalysts, the La 0.7 Ca 0.3 AlO 3−δ catalyst showed the highest performance in terms of C 2 H 6 + C 2 H 4 yield (11.1%). Surface mobile oxygen species (O 2 2– or O – ), which were considered as active oxygen species for the OCM reaction, increased with increasing Ca doping amount, and thereby the La 0.7 Ca 0.3 AlO 3−δ catalyst showed the best catalytic activity.

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