Calemma Vincenzo, Carati Angela, Flego Cristina, Giardino Roberto, Gagliardi Federica, Millini Roberto, Bellussi Giuseppe
Eni R&M Division, Via Maritano 26, San Donato Milanese, Milan, Italy.
ChemSusChem. 2008;1(6):548-57. doi: 10.1002/cssc.200800005.
The activity of different platinum-loaded zeolites (Mordenite, ZSM-12, ZSM-5, ZSM-23) was investigated in the hydroconversion of methylcyclohexane (MCH), in the context of upgrading highly aromatic distillates for fuel blending. In all cases, conversion of MCH proceeds according to a pathway where the primary products are a mixture of dimethylcyclopentanes and ethylcyclopentane formed by isomerization and ring contraction of MCH. The primary products undergo consecutive ring-opening reactions with formation of n- and isoheptanes. The latter further react to form lower-molecular-weight n- and isoalkanes. The selectivity and distribution of products deriving from ring-contraction and ring-opening reactions are strongly affected by the pore size and topology of the zeolites. ZSM-5 exhibits a strong reactant shape-selectivity effect on ring-opening products. The evaluated zeolites show the following order of activity in the conversion of methylcyclohexane: Mordenite>ZSM-12>ZSM-5>ZSM-23.
在高芳烃馏分油升级用于燃料调合的背景下，研究了不同负载铂的沸石（丝光沸石、ZSM - 12、ZSM - 5、ZSM - 23）在甲基环己烷（MCH）加氢转化中的活性。在所有情况下，MCH的转化遵循一条途径，其中主要产物是由MCH异构化和环收缩形成的二甲基环戊烷和乙基环戊烷的混合物。主要产物经历连续的开环反应，生成正庚烷和异庚烷。后者进一步反应形成较低分子量的正构和异构烷烃。环收缩和开环反应产物的选择性和分布受到沸石孔径和拓扑结构的强烈影响。ZSM - 5对开环产物表现出强烈的反应物形状选择性效应。所评估的沸石在甲基环己烷转化中表现出以下活性顺序：丝光沸石>ZSM - 12>ZSM - 5>ZSM - 23。
