Comparative Analysis of Reactant and Product Adsorption Energies in the Selective Oxidative Coupling of Alcohols to Esters on Au(111)

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Senozan S., TOFFOLİ H., Karatok M., Vovk E. I., Shah A. A., ÖZENSOY E., ...Daha Fazla

TOPICS IN CATALYSIS, cilt.59, ss.1383-1393, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 59
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1007/s11244-016-0660-5
  • Dergi Adı: TOPICS IN CATALYSIS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1383-1393
  • Anahtar Kelimeler: Density functional theory, van der Waals, Adsorption energy, Partial oxidation, Alcohols, Heterogeneous catalyst, DER-WAALS INTERACTIONS, ATOMIC OXYGEN, METHANOL OXIDATION, AEROBIC OXIDATION, GOLD CATALYSTS, FORMIC-ACID, ETHANOL, SURFACE, ACETALDEHYDE, MOLECULES
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Gold-based heterogeneous catalysts have attracted significant attention due to their selective partial oxidation capabilities, providing promising alternatives for the traditional industrial homogeneous catalysts. In the current study, the energetics of adsorption/desorption of alcohols (CH3OH/methanol, CH3CH2OH/ethanol, CH3CH2CH2OH/n-propanol) and esters (HCOOCH3/methyl formate, CH3COOCH3/methyl acetate, and CH3COOCH2CH3/ethyl acetate) on a planar Au(111) surface was investigated in conjunction with oxidative coupling reactions by means of temperature programmed desorption (TPD) and dispersion-corrected density functional theory (DFT) calculations. The results reveal a complex interplay between inter-molecular and surface-molecule interactions, both mediated by weak van der Waals forces, which dictates their relative stability on the gold surface. Both experimental and theoretical adsorption/desorption energies of the investigated esters are lower than those of the alcohols from which they originate through oxidative coupling reactions. This result can be interpreted as an important indication in favor of the selectivity of Au surfaces in alcohol oxidative coupling/partial oxidation reactions, allowing facile removal of partial oxidation products immediately after their generation preventing their complete oxidation to higher oxygenates.