Reactions of diazomethane on a clean, H-covered and O-covered Pt(111) surface

P. Berlowitz, B. L. Yang, J. B. Butt, Harold H Kung

Research output: Contribution to journalArticle

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Abstract

The reactions of diazomethane on a clean, a H-covered, and an O-covered Pt(111) surface were studied by temperature programmed desorption. Methane, ethylene, and hydrogen were the desorption products for the clean surface. The same products were observed together with nitrogen for the H-covered surface. Comparison of the desorption profiles on the clean and H-covered surfaces with those for ethylene and acetylene showed that methane was formed from the hydrogenation of surface methylene species that were formed by the dissociation of diazomethane on adsorption. Some of the surface methylene species also combined to form ethylene before undergoing further reaction. On the O-covered surface, products characteristic of the clean surface were observed together with the oxidation products water, CO and CO2. Some of the water was formed by the reaction of hydrogen released in the decomposition of methylene. The remaining water, CO, and CO2 were formed by the oxidation of an intermediate of stoichiometry CH, similar to the oxidation of ethylene and acetylene.

Original languageEnglish
Pages (from-to)540-554
Number of pages15
JournalSurface Science
Volume159
Issue number2-3
DOIs
Publication statusPublished - Aug 2 1985

Fingerprint

Diazomethane
Ethylene
ethylene
methylene
Acetylene
desorption
Methane
Carbon Monoxide
products
acetylene
Oxidation
oxidation
Water
Hydrogen
Desorption
methane
water
hydrogen
Temperature programmed desorption
Stoichiometry

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Reactions of diazomethane on a clean, H-covered and O-covered Pt(111) surface. / Berlowitz, P.; Yang, B. L.; Butt, J. B.; Kung, Harold H.

In: Surface Science, Vol. 159, No. 2-3, 02.08.1985, p. 540-554.

Research output: Contribution to journalArticle

Berlowitz, P. ; Yang, B. L. ; Butt, J. B. ; Kung, Harold H. / Reactions of diazomethane on a clean, H-covered and O-covered Pt(111) surface. In: Surface Science. 1985 ; Vol. 159, No. 2-3. pp. 540-554.
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AB - The reactions of diazomethane on a clean, a H-covered, and an O-covered Pt(111) surface were studied by temperature programmed desorption. Methane, ethylene, and hydrogen were the desorption products for the clean surface. The same products were observed together with nitrogen for the H-covered surface. Comparison of the desorption profiles on the clean and H-covered surfaces with those for ethylene and acetylene showed that methane was formed from the hydrogenation of surface methylene species that were formed by the dissociation of diazomethane on adsorption. Some of the surface methylene species also combined to form ethylene before undergoing further reaction. On the O-covered surface, products characteristic of the clean surface were observed together with the oxidation products water, CO and CO2. Some of the water was formed by the reaction of hydrogen released in the decomposition of methylene. The remaining water, CO, and CO2 were formed by the oxidation of an intermediate of stoichiometry CH, similar to the oxidation of ethylene and acetylene.

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