Toluene hydrogenation reaction for methylcyclohexane (MCH) synthesis via Pt-loaded Al2O3 and TiO2 (Pt/Al2O3 and Pt/TiO2) catalysts were studied in a fixed bed reactor at 398 K - 473 K and ambient pressure. Partial pressures of toluene, H2, and MCH were 60 to 91, 9 to 23, and 9 to 17 kPa, respectively. Pt-loaded catalysts showed higher activities in the order of Pt/Al2O3 > Pt/TiO2 (anatase-rutile mixture, AR) > Pt/TiO2 (anatase, A) > Pt/TiO2 (rutile, R) above 423 K, while Pt/TiO2 (anatase) showed greatly higher activities at 393 K. Kinetic analysis using rate-based model was conducted to estimate the effects of support species. The correlation between adsorption behavior and catalytic activities was sudied using a Langmuir-Hinshelwood model. The kinetic constants for each catalyst were almost same. It was considered that only kinetic constants cannot explain the catalytic activities. Coverage of toluene and MCH were independent of the reaction rates, however the reaction rates increased as hydrogen coverage increased for all catalysts.
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