A METHANOL–WATER COMPLEX STABILIZED ON A Zn(0001) SURFACE

S. Vijayalakshmi, C. P. Vinod and G. U. Kulkarni ()
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S. Vijayalakshmi: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur (PO), Bangalore, India
C. P. Vinod: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur (PO), Bangalore, India
G. U. Kulkarni: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur (PO), Bangalore, India

Surface Review and Letters (SRL), 2003, vol. 10, issue 01, 87-94

Abstract: Coadsorption of water and methanol on a clean Zn(0001) surface has been investigated by employing X-ray photoelectron spectroscopy after exposing the surface at 80 K to the binary vapor from water–methanol liquid mixtures of varying compositions and subsequently warming the surface up to the room temperature. When the surface was exposed to the vapor from a mixture with water molefraction,xw, of 0.5, the proton abstraction and the C–O bond cleavage in methanol leading to methoxy (CH3O) and the hydrocarbon (CHx) species respectively, occurs at a much higher temperature of 180 K, compared to 120 K in the case of pure methanol adsorption. For water-rich mixtures (xw= 0.7and 0.9) molecular methanol is stabilized on the surface up to 200 K, beyond which water itself desorbs. Forxw= 0.7, virtually no dissociation is observed up to 200 K. The increased stability of molecular methanol on the Zn(0001) surface is attributed to the surface-mediated hydrogen bonds that stabilize a water–methanol complex.

Keywords: Adsorption; X-ray photoelectron spectroscopy; Zn(0001) surface; methanol–water; H bond (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X0300469X

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