Infrared identification of adsorbed surface species on Ni/SiO sub 2 and Ni/Al sub 2 O sub 3 from ethylene and acetylene adsorption

Journal Article · Thu May 31 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100374a044· OSTI ID:6379095

Lapinski, M P; Ekerdt, J G ^[1]

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1. Univ. of Texas, Austin (USA)

The adsorption of ethylene and acetylene was studied on Ni/SiO{sub 2} and Ni/Al{sub 2}O catalysts over the temperature range 177-300 K with Fourier-transform infrared spectroscopy (FTIR). The general approach involved adsorbing ethylene or acetylene and monitoring the subsequent surface transformations with FTIR as the catalyst was heated, exposed to hydrogen or deuterium, or subjected to vacuum. For the adsorption of ethylene on Ni/SiO{sub 2} and Ni/Al{sub 2}O{sub 3} at temperatures below 250 K, two types of {pi}-bonded species (A and B), a {sigma}-{pi}-ethylene species (hybridization between sp{sup 2} and sp{sup 3}) and ethylidyne were identified. Over the temperature range 194-240 K, {pi}-bonded species B and the {sigma}-{pi}-ethylene species were observed to decompose while ethylidyne formed. A mechanism is proposed in which adsorbed H inserts into {pi}-bonded species B and the {sigma}-{pi}-ethylene species leading to ethyl and ethylidene intermediates, and finally ethylidyne.

• OSTI ID: 6379095
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACETYLENE
ADSORPTION
ALKENES
ALKYNES
CATALYSTS
DATA
DATA ANALYSIS
ELEMENTS
ETHYLENE
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
NICKEL
NUMERICAL DATA
ORGANIC COMPOUNDS
SORPTION
SPECTRA
SURFACE PROPERTIES
TRANSITION ELEMENTS