作者:Matthew J. Wulfers、Friederike C. Jentoft
DOI:10.1016/j.jcat.2014.12.035
日期:2015.10
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 1,4-13C2-n-butane. The findings explain how reaction conditions affect product selectivity and clarify the controversy around butane isomerization on solid acids.
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-丝光沸石上的反应途径。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正活化能为120–134 kJ / mol。异丁烷相对于n的反应阶数Pt / H-丝光沸石上的丁烯含量为1.0-1.2,与主要的单分子形成途径一致。歧化产物的阶数接近2表示形成了双分子途径。从低于20ppm至约120ppm的丁烯浓度的增加极大地增加双分子骨架异构化的速率,如从1,4-转换确定13 Ç 2 - Ñ丁烷。这些发现解释了反应条件如何影响产物的选择性,并澄清了关于丁烷异构化固体酸的争议。