糠醛在Pt(111)表面的吸附和脱碳反应

doi:10.3866/PKU.WHXB201307101

Abstract

Abstract:

The reaction mechanismof furan formation during decarbonylation of furfural on the Pt(111) plane was investigated by density functional theory generalized gradient approximation calculations with the slab model. The adsorption energy of furfural was calculated to determine preferred adsorption sites on the Pt(111) plane. The revealed possible mechanisms for the decarbonylation of furfural on the Pt(111) plane were studied. The results showed that a furfural molecule loses 0.765 electrons after adsorption on the Pt(111) surface. The d orbitals of the metal surface interact strongly with the π bonds of the furfural ring. This reduced the aromaticity of the furfural ring and the Catoms showed characteristics consistent with sp³ hybridization. The molecular plane of the adsorbate was distorted, and corresponding changes of bond lengths were found. The C―H(O) bonds and―CHO of furfural tilted away from the Pt surface. The calculations showthat furan was a possible product of the decarbonylation reaction. We then searched the transition states (TSs) and reaction potential energy surfaces with the linear and quadratic synchronous transit (LST/QST) complete search. By comparing energy barriers, we obtained the optimal path, which involved furfural forming an acyl intermediate by loss of the Hatom from the branched chain rather than direct decarburization. Furan was then formed by decarburization and hydrogenation of the acyl intermediate. The calculated barrier for the rate-determining step(C₄H₃O)CO^*+^*→C₄H₃O^*+ CO^* (^* is adsorption site) is 127.65 kJ·mol^-1.

Key words: Pt(111) surface, Density functional theory, Adsorption, Furfural, Decarbonylation reaction

NI Zhe-Ming, XIA Ming-Yu, SHI Wei, QIAN Ping-Ping. Adsorption and Decarbonylation Reaction of Furfural on Pt(111) Surface[J]. Acta Phys. -Chim. Sin. 2013, 29(09), 1916-1922. doi: 10.3866/PKU.WHXB201307101

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Adsorption and Decarbonylation Reaction of Furfural on Pt(111) Surface

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