Propene oxidation over Cu[sub 2]O single-crystal surfaces: A surface science study of propene activation at 1 atm and 300 K

Journal Article · Fri Oct 01 00:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1290· OSTI ID:5183221

Schulz, K H; Cox, D F ^[1]

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1. Virginia Polytechnic Institute and State Univ., Blacksburg, VA (United States)

Propene oxidation was studied on Cu[sub 2]O single-crystal surfaces using XPS and TDS in ultrahigh vacuum (UHV) following propene exposures at 300 K and atmospheric pressure. Three different Cu[sub 2]O surfaces were examined: A Cu[sup +]-terminated (100) surface, an oxygen-terminated (100) surface, and a (111) surface with accessible copper cations and lattice oxygen. Selective oxidation to acrolein is promoted by coordinately unsaturated surface lattice oxygen. No clear correlation between the formation of partial oxidation products and oxygen coordination was observed. Both selective and nonselective oxidation products are formed from lattice oxygen. The propene oxidation pathway proceeds through an allyloxy (CH[sub 2][double bond]CHCH[sub 2]O-) species where oxygen insertion occurs prior to the second hydrogen abstraction over Cu[sub 2]O. This conclusion was reached by comparing the propene TDS results from atmospheric pressure exposures with UHV allyl alcohol and acrolein thermal desorption data. The selective oxidation process over Cu[sub 2]O is subject to a [open quotes]pressure gap[close quotes] at 300 K with oxygen insertion occurring at higher pressures, presumably because of translational and collisional activation. However, the subsequent steps in the selective oxidation pathway can be effectively modeled by dissociative adsorption of oxygenates under UHV to simulate the oxygenated surface intermediates. 34 refs., 8 figs., 1 tab.

• OSTI ID: 5183221
• Journal Information: Journal of Catalysis; (United States), Vol. 143:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
10 SYNTHETIC FUELS
COPPER OXIDES
CATALYTIC EFFECTS
PROPYLENE
OXIDATION
CHEMICAL ACTIVATION
HETEROGENEOUS CATALYSIS
MILLER INDICES
PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY
ALKENES
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
ELECTRON SPECTROSCOPY
HYDROCARBONS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
100200 - Synthetic Fuels- Production- (1990-)