SYNTHESIS OF ORDERED MESOPOROUS CARBON SUPPORTED Pt-MoOx CATALYST AND ITS CATALYTIC PERFORMANCE FOR METHYLCYCLOHEXANE DEHYDROGENATION

Abstract

Abstract: Using ordered mesoporous carbon (CMK-3) as a carrier, yPt/CMK-3 and MoO_x additive-modulated catalyst yPt-zMoO_x/CMK-3 (y and z are the number of deposition cycles of Pt and MoO_x, respectively) were prepared by atomic layer deposition technology. The impact of the number of deposition cycles on the dispersion of the Pt metal and the catalytic performance for the dehydrogenation of methylcyclohexane was studied. The results showed that optimal Pt dispersion and an appropriate amount of atomically dispersed MoO_x additives could significantly improved the performance of Pt-based catalysts. Compared with 10Pt/CMK-3, the dehydrogenation rate (amount of H₂ produced per unit mass of Pt per unit time) on the catalyst 10Pt-1MoO_x/CMK-3 increased from 79.02 mol/(g.h) to 97.88 mol/(g.h), and the methylcyclohexane conversion rate increased from 71% to 91%. The addition of MoO_x additive had little effect on the dispersion of Pt nanoparticles, mainly increased the electron density on the Pt surface and decreased the activation temperature of catalyst. In addition, the MoO_x additives can promote the desorption of H₂ on the catalyst surface through hydrogen overflow, thus increasing the yield of H₂. The research provides a theoretical basis for the design of efficient methylcyclohexane dehydrogenation catalysts.

Key words: methylcyclohexane, organic liquid hydrogen storage carrier, dehydrogenation catalyst, additive, ordered mesoporous carbon

References

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