Adsorption and decomposition of HCOOH on potassium-promoted Rh(111) surfaces

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Abstract

Preadsorbed potassium significantly altered the adsorption and the reactions of HCOOH on Rh(111) surface. A potassium-induced desorption peak of HCOOH was identified, with TP = 254 K. Preadsorbed potassium enhanced the dissociation of HCOOH and stabilized a formate species characterized by the photoemission peaks at 5.2, 8.9, 10.3, and 12.2 eV in the He II spectrum. These peaks were eliminated at 267 K on clean Rh, at 330 K at θK ≈ 0.1, and above 422 K with a monolayer of potassium (θK = 0.36). Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures than from the K-free surface. In the interpretation of the effects of potassium, an extended charge transfer between HCOOH and the K/Rh(111) surface (at θK ≈ 0.1) and a direct chemical interaction between potassium and HCOOH involving the formation of potassium formate like species (θK ≈ 0.36) are assumed.

Original languageEnglish
Pages (from-to)796-803
Number of pages8
JournalJournal of Physical Chemistry
Volume92
Issue number3
Publication statusPublished - 1988

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formic acid
Potassium
potassium
Decomposition
decomposition
Adsorption
adsorption
formates
Photoemission
Carbon Monoxide
Charge transfer
Monolayers
Desorption
photoelectric emission
desorption
charge transfer
dissociation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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Adsorption and decomposition of HCOOH on potassium-promoted Rh(111) surfaces. / Solymosi, F.; Kiss, J.; Kovács, I.

In: Journal of Physical Chemistry, Vol. 92, No. 3, 1988, p. 796-803.

Research output: Contribution to journalArticle

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abstract = "Preadsorbed potassium significantly altered the adsorption and the reactions of HCOOH on Rh(111) surface. A potassium-induced desorption peak of HCOOH was identified, with TP = 254 K. Preadsorbed potassium enhanced the dissociation of HCOOH and stabilized a formate species characterized by the photoemission peaks at 5.2, 8.9, 10.3, and 12.2 eV in the He II spectrum. These peaks were eliminated at 267 K on clean Rh, at 330 K at θK ≈ 0.1, and above 422 K with a monolayer of potassium (θK = 0.36). Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures than from the K-free surface. In the interpretation of the effects of potassium, an extended charge transfer between HCOOH and the K/Rh(111) surface (at θK ≈ 0.1) and a direct chemical interaction between potassium and HCOOH involving the formation of potassium formate like species (θK ≈ 0.36) are assumed.",
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T1 - Adsorption and decomposition of HCOOH on potassium-promoted Rh(111) surfaces

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AU - Kiss, J.

AU - Kovács, I.

PY - 1988

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N2 - Preadsorbed potassium significantly altered the adsorption and the reactions of HCOOH on Rh(111) surface. A potassium-induced desorption peak of HCOOH was identified, with TP = 254 K. Preadsorbed potassium enhanced the dissociation of HCOOH and stabilized a formate species characterized by the photoemission peaks at 5.2, 8.9, 10.3, and 12.2 eV in the He II spectrum. These peaks were eliminated at 267 K on clean Rh, at 330 K at θK ≈ 0.1, and above 422 K with a monolayer of potassium (θK = 0.36). Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures than from the K-free surface. In the interpretation of the effects of potassium, an extended charge transfer between HCOOH and the K/Rh(111) surface (at θK ≈ 0.1) and a direct chemical interaction between potassium and HCOOH involving the formation of potassium formate like species (θK ≈ 0.36) are assumed.

AB - Preadsorbed potassium significantly altered the adsorption and the reactions of HCOOH on Rh(111) surface. A potassium-induced desorption peak of HCOOH was identified, with TP = 254 K. Preadsorbed potassium enhanced the dissociation of HCOOH and stabilized a formate species characterized by the photoemission peaks at 5.2, 8.9, 10.3, and 12.2 eV in the He II spectrum. These peaks were eliminated at 267 K on clean Rh, at 330 K at θK ≈ 0.1, and above 422 K with a monolayer of potassium (θK = 0.36). Decomposition of the formate species led to the formation of H2, CO2, H2O, and CO, which desorbed at significantly higher temperatures than from the K-free surface. In the interpretation of the effects of potassium, an extended charge transfer between HCOOH and the K/Rh(111) surface (at θK ≈ 0.1) and a direct chemical interaction between potassium and HCOOH involving the formation of potassium formate like species (θK ≈ 0.36) are assumed.

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