Kinetics Analysis of Methylcyclohexane Dehydrogenation over Se-Modified Pt/TiO2 Catalysts

Methylcyclohexane (MCH) dehydrogenation is essential for the practical utilization of organic hydrides as hydrogen carriers. Selenium (Se) modification on Pt/TiO2 catalysts has been found to be effective for MCH dehydrogenation in our previous research. To determine the effects of Se modification on the reaction, reaction kinetics analysis was performed. The Se modification onto rutile-type TiO2 (STR, STR-100N) before Pt loading (Pt/Se/STR) showed the highest activity, and even a small amount of Se significantly improved the activity. Although the kinetic analysis of Pt/STR showed that the reaction rate of MCH dehydrogenation decreased at high MCH partial pressures, the reaction rates of Pt/Se/STR and Se/Pt/STR remained the same even at high MCH partial pressures. We found that the inhibition of MCH adsorption onto the catalyst could be prevented by Se modification. This behavior was confirmed by adsorption/desorption evaluations.