有序介孔炭负载Pt-MoO_x催化剂的制备及其 催化甲基环己烷脱氢性能

Using ordered mesoporous carboni (CMK-3 ) as a carrier, yPt/CMK-3 and MoO_x addiiive modulaled catalyst yPl-zMoO_x/CMK-3 (y and z are ihe 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 Pl-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 10 Pt-1 MoO_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.