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首页> 外文期刊>Catalysis science & technology >Geometric effect in the highly selective hydrogenation of 3-methylcrotonaldehyde over Pt@ZIF-8 core-shell catalysts
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Geometric effect in the highly selective hydrogenation of 3-methylcrotonaldehyde over Pt@ZIF-8 core-shell catalysts

机译：几何效应的高度选择性加氢的3-methylcrotonaldehydePt@ZIF-8核壳催化剂

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摘要

ZIF-8 encapsulated Pt nanoparticles (NPs) were investigated for the hydrogenation of 3-methylcrotonaldehyde to prenol using the geometric effect. HR-TEM, HAADF-STEM, XRD, nitrogen adsorption isotherm characterization and size-selective reaction evaluation demonstrated that the Pt NPs were encapsulated in the inner space of ZIF-8. The Pt NPs in the Pt@ZIF-8 catalyst were surrounded by apertures with sizes commensurate with 3-methylcrotonaldehyde molecules. These narrow apertures forced the 3-methylcrotonaldehyde molecules to linearly approach the active sites. The C=C bond in the middle of the 3-methylcrotonaldehyde molecule was prevented from interacting with the Pt active sites by the narrow apertures around the Pt NPs, while the C=O bond at the tail-end was easily adsorbed and further hydrogenated to prenol. Using this geometric effect, the Pt@ZIF-8 catalyst exhibited a high selectivity to prenol (>84%) even at a high conversion (>90%).
机译：ZIF-8封装Pt纳米粒子(NPs)加氢的调查3-methylcrotonaldehyde prenol使用几何效果。氮吸附等温式特征size-selective反应评估证明Pt NPs是封装在内部ZIF-8的空间。催化剂与大小光圈包围符合3-methylcrotonaldehyde分子。3-methylcrotonaldehyde分子线性方法活跃的网站。3-methylcrotonaldehyde中间分子阻止与Pt交互活动在Pt NPs网站通过狭窄的孔径,尾声,C = O键很容易吸附和进一步氢化prenol。使用这个几何效应,Pt@ZIF-8催化剂表现出prenol高选择性(> 84%)甚至在高转换(> 90%)。

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