Dehydrogenation Mechanism of Ethanol on Co(111) Surface: A First-principles Study
Received date: 2019-01-10
Online published: 2019-03-12
Supported by
Project supported by the National Natural Science Foundation of China (No. 21573031).
The detailed reaction mechanism of ethanol dehydrogenation on Co(111) surface was studied using the density functional theory (DFT) and slab periodic model. The structures and energies of the species involved in the reaction adsorbed on different adsorption sites (top, fcc, hcp and bridge sites) of the surface were calculated and compared. The calculated results show that ethanol adsorbs weakly on the Co(111) surface. CH3CH2O, CH and C prefer hcp sites with adsorption energies of -2.72, -6.85, and -6.92 eV, respectively. CH3CHO adsorbs weakly at the bridge-η1(O)-η1(Cα) site with adsorption energy of -0.47 eV. CH3CO and CH2 adsorb stably on Co(111) surface through their unsaturated C atoms with binding energies of -2.31 and -3.90 eV, respectively. CH3 and CH4 prefer to locate at top sites through the C atom with adsorption energies of -1.95 and -0.12 eV, respectively. CO and H are bind stably at fcc sites with binding energies of -1.62 and -2.77 eV, respectively. Due to the complexity of the decomposition of ethanol, the scissions of O-H, C-H, C-O and C-C bonds of CH3CH2OH were examined. The results show that ethanol decomposition on Co(111) surface starts with the scission of the O-H bond, and the dehydrogenation reaction of ethanol on Co(111) surface can be described as three reaction pathways:Path I is the gradual dehydrogenation of CH3CH2OH via intermediate CH3CHO, which ultimately produces CH4 and CO; Path Ⅱ is the reaction of CH3CH2O and CH3CHO which were generated by dehydrogenation of ethanol, to form CH4 and CO2 via CH3COOH intermediate; Path Ⅲ is the process of CH3CH2O reacts with CH3CO to generate CH3COOC2H5. On the basis of our computational results, Path I (CH3CH2OH→CH3CH2O→CH3CHO→CH3CO→CH3+CO→CH2→CH→CH4+CO+C+H) is more favorable than Paths Ⅱ and Ⅲ and the dehydrogenation of CH3CH2O to CH3CHO is the rate-determining step with a reaction energy barrier of 1.61 eV.
Key words： first principle; ethanol; Co(111) surface; dehydrogenation; adsorption
Fu Wenwen , Li Yan , Liang Changhai . Dehydrogenation Mechanism of Ethanol on Co(111) Surface: A First-principles Study[J]. Acta Chimica Sinica, 2019 , 77(6) : 559 -568 . DOI: 10.6023/A19010020
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