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首页> 外文期刊>Journal of Catalysis >Mechanism of n-butane skeletal isomerization on H-mordenite and Pt/H-mordenite
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Mechanism of n-butane skeletal isomerization on H-mordenite and Pt/H-mordenite

机译：正丁烷骨架异构化H-丝光沸石和Pt / H-丝光沸石的机理

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Kinetics and isotope labeling experiments were used to investigate the reaction pathways of n-butane on H-mordenite and Pt/H-mordenite at atmospheric pressure and temperatures of 543-583 K. Butenes, either formed on the catalyst or present in the feed, controlled the relative rates of mono- and bimolecular reaction pathways. The true activation energy for isobutane formation was found to be 120-134 kJ/mol. The reaction order for isobutane formation with respect to n-butene on Pt/H-mordenite was 1.0-1.2, consistent with a predominately monomolecular route of formation. An order close to 2 for disproportionation products indicated a bimolecular route of formation. An increase of the butene concentration from less than 20 ppm to about 120 ppm greatly increased the rate of bimolecular skeletal isomerization, as determined from conversion of 1,4-C-13(2)-n-butane. The findings explain how reaction conditions affect product selectivity and clarify the controversy around butane isomerization on solid acids. (C) 2015 Elsevier Inc. All rights reserved.
机译：动力学和同位素标记实验用于研究在大气压和543-583 K的温度下正丁烷在H-丝光沸石和Pt / H-丝光沸石上的反应路径。控制了单分子和双分子反应途径的相对速率。发现异丁烷形成的真实活化能为120-134kJ / mol。相对于Pt / H-丝光沸石上的正丁烯，异丁烷形成的反应顺序为1.0-1.2，这与主要的单分子形成途径一致。歧化产物的阶数接近2表示形成双分子途径。由1，4-C-13（2）-正丁烷的转化率确定，丁烯浓度从小于20 ppm增加到约120 ppm大大增加了双分子骨架异构化的速率。这些发现解释了反应条件如何影响产物的选择性，并阐明了关于丁烷异构化固体酸的争议。 （C）2015 Elsevier Inc.保留所有权利。

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