Adsorption and Decomposition of 2(5H)-Furanone on Pd(111) and Pt(111): Comparison of Ring-Opening Pathways of an Unsaturated Cyclic Ester
Adsorption and Decomposition of 2(5H)-Furanone on Pd(111) and Pt(111): Comparison of Ring-Opening Pathways of an Unsaturated Cyclic Ester
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2(5H)-呋喃酮在 Pd(111) 和 Pt(111) 上的吸附和分解：不饱和环酯开环路径的比较
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发表时间：
2009
期刊：
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通讯作者：
J. Medlin
中科院分区：
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作者：
C. M. Horiuchi;Meghana Rangan;B. M. Israel;J. Medlin
用高分辨电子能量损失谱（HREELS）和程序升温脱附（TPD）研究了2（5 H）-呋喃酮（25 HF）在Pd（111）和Pt（111）表面的热表面化学。在<140 K下吸附25 HF后，将温度升高到300 K以上导致呋喃酮环的打开和分解。在两个表面上，25 HF经历脱羰和脱氢，形成CO和H2作为主要的解吸产物。Pd（111）和Pt（111）反应性的一个关键区别是Pt（111）产生的CO2量相对较高，这表明25 HF分解部分是通过Pt（111）上的额外表面中间体进行的。HREELS提供了反应通过不同途径进行的进一步指示。在Pd（111）上，观察到直接脱羰基为表面CO和次乙基。在Pt（111）上，提出了两种反应途径。一条途径与Pd（111）的反应途径相似，在TPD过程中产生CO，另一条途径通过保留OCO官能团的中间体进行，并产生CO2作为脱附产物。
The thermal surface chemistry of 2(5H)-furanone (25HF) on Pd(111) and Pt(111) was studied using high-resolution electron energy loss spectroscopy (HREELS) and temperature-programmed desorption (TPD). After adsorbing 25HF on each surface at <140 K, increasing the temperature above 300 K resulted in opening and decomposition of the furanone ring. On both surfaces, 25HF undergoes decarbonylation and dehydrogenation to form CO and H 2 as the principal desorption products. A key difference between Pd(111) and Pt(111) reactivity is the relatively high amount of CO 2 produced from Pt(111), suggesting that 25HF decomposition proceeds in part through an additional surface intermediate on Pt(111). HREELS provides further indications that the reactions proceed through distinct pathways. On Pd(111), direct decarbonylation to surface CO and ethylidyne is observed. On Pt(111), two reaction pathways are proposed. One pathway is similar to the reaction pathway for Pd(111) and produces CO during TPD, and the other proceeds through an intermediate that retains the OCO functional group and results in CO 2 as a desorption product.