Theoretical Study of O-Assisted Selective Coupling of Methanol on Au(111)

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• 作者：Bingjun Xu ; Jan Haubrich ; Thomas A. Baker ; Efthimios Kaxiras ; Cynthia M. Friend
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 10, 2011
• 年：2011
• 卷：115
• 期：9
• 页码：3703-3708
• 全文大小：823K
• 年卷期：v.115,no.9(March 10, 2011)
• ISSN：1932-7455

文摘

We report the first systematic theoretical study of the oxidative self-coupling of methanol to form the ester, methylformate, on atomic-oxygen-covered Au(111) using density functional theory calculations. The first step in the process鈥攄issociation of the O鈭扝 bond in methanol鈥攈as a lower barrier for transfer of the proton to adsorbed oxygen than for transfer of H to gold, consistent with experimental observations that O is necessary to initiate the reaction. The computed barrier for formation of methoxy (CH₃O) and OH is 0.41 eV, compared with 1.58 eV calculated for the transfer of H to the clean Au surface. Several different pathways for the ensuing 尾-H elimination in CH₃O(ads) to form formaldehyde have been considered, namely, attack by adsorbed O, OH, or a second CH₃O, and transfer to the Au metal. Methoxy attacked by surface oxygen has the lowest calculated barrier, 0.49 eV, and leads to adsorbed H₂C鈺怬 and OH. Subsequent coupling of methoxy and formaldehyde has no apparent barrier in the calculation, consistent with the experimental conclusion that 尾-H elimination is the rate-limiting step for the overall reaction. With the exception of surface oxygen, all other surface species have low diffusion barriers, suggesting that rearrangement and movement of these species from the preferred adsorption sites to configurations necessary for reactions occur readily, thus contributing to the activity for coupling on gold.