Reactivity of ethyl groups on a Sn/Pt(111) surface alloy

• Published in: Catalysis letters Vol. 99; no. 1-2; pp. 27 - 32
• Main Authors: HAIBO ZHAO, KOEL, Bruce E
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 2005; Springer Nature B.V
• Subjects: Catalysis; Chemical synthesis; Chemistry; Dehydrogenation; Ethane; Ethylene; Exact sciences and technology; General and physical chemistry; Surface alloying; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Thermal stability; Tin base alloys; Hydrogen; Ethylene; TPD; ethyl; Crystal face; Tin Alloys; Ethane; Heterogeneous catalysis; H-atom; Transition metal Alloys; Dehydrogenation; Sn/Pt alloy; Platinum Alloys; Chemical reactivity
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-004-0772-6

In order to probe the thermal stability and reactivity of ethyl intermediates on Pt-Sn alloy catalysts, we have synthesized these species by reaction of H atoms with adsorbed ethylene on a (\[{\sqrt 3} \times {\sqrt 3}\] ) R30°-Sn/Pt(111) surface alloy. Adsorbed ethyl groups are stable until 376 are they react to evolve ethane, ethylene, and H2. The activation energy for ethyl dehydrogenation is Edehyd* 97 kJ mol, which is twice that reported on Pt(111). In addition, we place a lower limit of Edehyd* 97 kJ mol on the barrier to ethyl hydrogenation on this alloy.