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首页> 外文期刊>Fuel Processing Technology >Selective ring opening of methylcyclohexane and decalin over Rh-Pd supported catalysts: Effect of the preparation method
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Selective ring opening of methylcyclohexane and decalin over Rh-Pd supported catalysts: Effect of the preparation method

机译：在RH-Pd负载型催化剂上选择甲基环己烷和癸蛋白的选择性环：制备方法的作用

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Bimetallic Rh-Pd catalysts prepared by various impregnation methods were evaluated in the selective ring-opening of decalin and methylcyclohexane (MCH) used as model molecules of hydrogenated aromatics of the Light Cycle Oil fraction. Rh and Pt were deposited on Al2O3 and SiO2-Al2O3 (S40) by coimpregnation (Cl) or successive impregnations (SI) with different orders of metal addition. Catalysts were characterized by H-2 chemisorption, temperature-programmed reduction, temperature-programmed desorption of pyridine, and test reactions of cyclopentane hydrogenolysis and isomerization of 3,3-dimethyl-1-butene. Their catalytic behaviors for the ring-opening reaction were deeply influenced by the acidity of the support, and in a lesser extent by the metal deposition method. On both supports, the CI catalysts, displaying the highest dispersion values, exhibited the best ring opening performances. In the case of the SI catalysts, the addition order of both metals modified in a moderate way the properties of the catalyst. The yield to ring opening products obtained in MCH ring opening with CI catalysts supported on Al2O3 was 39-69% higher than those prepared by SI (conversion = 55-60%) while for the catalysts supported on S40, the yield to ring opening products was 8-48% higher for the CI catalysts compared to SI catalysts (conversion = 72-77%). The conversion of decalin for the bimetallic catalysts supported on Al2O3 was lower than 20% being dehydrogenated compounds the main reaction products regardless the preparation method. The catalyst supported on S40 showed decalin conversion values between 46-53% and yield to ring opening near to 30%. Moreover, the CI catalysts have yield to ring opening 10 to 20% higher than the catalysts prepared by SI. The catalyst prepared by coimpregnation supported on S40 was the most appropriate for opening the MCH and decalin due to an optimal balance between the metal and acid functions. (C) 2015 Elsevier B.V. All rights reserved.
机译：通过各种浸渍方法制备的双金属Rh-Pd催化剂在用作光循环油级分的氢化芳烃的模型分子的癸蛋白和甲基环己烷（MCH）中评价各种浸渍方法。通过凝固（Cl）或连续浸渍（Si）沉积在Al 2 O 3和S40）上沉积在Al 2 O 3和S40）上，具有不同的金属添加次数。催化剂的特征在于H-2化学吸附，温度编程的降低，吡啶的温度编程解吸，以及环戊烷氢解的测试反应和3,3-二甲基-1-丁烯的异构化。它们的催化性能对于开环反应的催化性能受到载体酸度的深受影响，并且在较小程度上通过金属沉积方法。在两个支撑件上，显示最高分散值的CI催化剂表现出最佳的环开口性能。在Si催化剂的情况下，两种金属的添加顺序以中等方式改性催化剂的性质。在MCH环开口中获得的环开口产物，其CI催化剂在Al 2 O 3上高于Si（转化率= 55-60％）的催化剂，同时在S40上负载的催化剂，产量为环开口产品与Si催化剂相比，Ci催化剂的催化剂为8-48％（转化率= 72-77％）。在Al 2 O 3上负载的双金属催化剂的癸蛋白的转化物低于20％，脱氢化合物主要反应产物无论制备方法如何。在S40上负载的催化剂显示癸蛋白转化值46-53％，产率达到30％的环开口。此外，CI催化剂的产率与Si制备的催化剂高出10至20％。通过在S40上负载的凝胶制备的催化剂是最合适的，对于在金属和酸功能之间的最佳平衡，最适合于打开MCH和癸蛋白。 （c）2015 Elsevier B.v.保留所有权利。

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