首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Chemisorption-Induced Activation of MgCl2 Film as Realistic Route for Heterogeneous Ziegler-Natta Surfaces under Ultrahigh Vacuum
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Chemisorption-Induced Activation of MgCl2 Film as Realistic Route for Heterogeneous Ziegler-Natta Surfaces under Ultrahigh Vacuum

机译:超高压真空下,化学吸附诱导的MgCl2薄膜作为现实途径的近极Ziegler-Natta表面的现实途径

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摘要

The preparation of model Ziegler-Natta (ZN) surfaces under ultrahigh vacuum necessitates the activation of MgCl2 films deposited on a substrate, since these films unexceptionally expose the energetically most stable but catalytically inactive (001) face. Here, we present a method to activate MgCl2 films with the inactive (001) termination, which was based on the chemisorption of a Lewis base in an analogous way to industrial powder catalyst preparation. We found that a (001)-terminated MgCl2 film on Cu(110) was activated into a MgCl2.Lewis base adduct when exposed to a pyridine vapor at a nearly saturated vapor pressure. A dynamic response of the MgCl2 film to the chemisorption and desorption of a Lewis base was uncovered using low-energy electron diffraction and temperature-programmed desorption.
机译:在超高真空下的模型Ziegler-Natta(Zn)表面的制备需要激活沉积在基材上的MgCl2膜,因为这些薄膜不确定暴露高能量最稳定但催化无活性(001)面。 这里,我们提出了一种用无活性(001)终止激活MgCl2膜的方法,其基于Lewis基碱的化学以类似于工业粉末催化剂制剂的方法。 我们发现,当在几乎饱和的蒸气压下暴露于吡啶蒸气时,将Cu(110)上的(001)替米替米氨酸MgCl2膜活化成MgCl2.Lewis碱基加合物。 使用低能量电子衍射和温度编程的解吸来揭示MgCl2膜对lewis碱的化学吸附和解吸的动态响应。

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