CO2 activation and reaction with hydrogen on Ni(110): formate formation

✍ Scribed by J. Wambach; G. Illing; H.-J. Freund

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 541 KB
• Volume: 184
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(91)87194-g

✦ Synopsis

Upon adsorption of CO2 at Tr 90 K on Ni( 1 lo), the molecule weakly chemisorbs and undergoes a geometrical distortion, i.e. it bends into a nonlinear geometry. This geometrical distortion is triggered by electron transfer from the substrate to the molecule, accompanied by formation of an anionic CO;-molecule. It is shown via HREELS spectra that CO$-reacts with adsorbed H atoms in low concentration ( 6 0. I a) via a Langmuir-Hinshelwood mechanism to form the formic acid anion, i.e. formate, which remains adsorbed on the surface. Hydrogen coverages, which allow the surface to reconstruct, inhibit CO1 chemisorption.