Formation of n-hexane from methylcyclopentane via a metallacyclobutane intermediate at step sites of Pt surfaces: Mechanism from first-principles calculations

Formation of n-hexane from methylcyclopentane via a metallacyclobutane intermediate at step sites of Pt surfaces: Mechanism from first-principles calculations
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甲基环戊烷通过金属环丁烷中间体在 Pt 表面的台阶位点形成正己烷:第一性原理计算的机理

DOI:
10.1016/j.jcat.2012.11.033
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发表时间:
2013
影响因子:
7.3
通讯作者:
Rösch
Rösch
中科院分区:
化学1区
文献类型:
--
作者:
Moskaleva;Rösch

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通过周期性密度泛函理论计算,我们研究了甲基环戊烷通过αγ吸附的金属环丁烷中间体在阶梯模型表面Pt(322)上开环成正己烷的过程。经计算,C-C裂解的关键势垒低至79kJmol−1,比通过ααββ吸附的中间体在Pt(211)上生成2-或3-甲基戊烷的类似步骤的值低约20kJmol−1。因此,在铂表面的阶梯位置,(未支化)正己烷的形成似乎比支化己烷的形成更有利。
With periodic density functional theory calculations, we examined the ring opening of methylcyclopentane to n-hexane via an αγ-adsorbed metallacyclobutane intermediate over the stepped model surface Pt(322). The crucial barrier of C–C scission along this pathway was calculated as low as 79kJmol−1, that is, about 20kJmol−1lower than the value for analogous steps via ααββ-adsorbed intermediates on the way to 2- or 3-methylpentane on Pt(211). Thus, at step sites of Pt surfaces, formation of (unbranched) n-hexane seems to be more favorable than formation of branched hexanes.
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