Acetic Acid Adsorption and Reactions on Ni(110)

Langmuir : the ACS Journal of Surfaces and Colloids
Michelle S HofmanBruce E Koel

Abstract

Acetic acid adsorption and reactions at multiple surface coverage values on Ni(110) were studied with temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS) at 90-500 K. The experimental measurements were interpreted with density functional theory (DFT) calculations that provided information on adsorbate geometries, energies, and vibrational modes. Below the monolayer saturation coverage of 0.36 ML at 90 K, acetic acid adsorbs mostly molecularly. Above this coverage, a physisorbed layer is formed with dimers and catemers, without detectable monomers. Dimers and catemers desorb as molecular acetic acid at 157 and 172 K, respectively. Between 90 and 200 K, the O-H bond in acetic acid breaks to form bridge-bonded bidentate acetate that becomes the dominant surface species. Desorption-limited hydrogen evolution is observed at 265 K. However, even after the acetate formation, acetic acid desorbs molecularly at 200-300 K due to recombination. Minor surface species observed at 200 K, acetyls or acetates with a carbonyl group, decompose below 350 K and generate adsorbed carbon monoxide. At 350 K, the surface likely undergoes restructuring, the extent of which increases with acetic acid coverage. ...Continue Reading

References

Dec 25, 2003·Journal of the American Chemical Society·Ermelinda M S MaçôasMarkku Räsänen
Sep 14, 2006·Chemical Reviews·George W HuberAvelino Corma
Oct 26, 2007·Physical Chemistry Chemical Physics : PCCP·Michael BowkerVladimir P Zhdanov
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Feb 23, 2020·Chemistry : a European Journal·Yiteng ZhengSimon G Podkolzin

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Citations

May 5, 2021·Chemical Research in Toxicology·Nathalie HayeckNajat A Saliba
Sep 28, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Ziyu TangSimon G Podkolzin

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