Oxidation chemistry of {eta}{sup 3}-C{sub 3}H{sub 5} ({pi}-allyl) on Ag(110)

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:141423

Carter, R N; Anton, A B ^[1]; Apai, G ^[2]

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1. Cornell Univ., Ithaca, NY (United States)
2. Eastman Kodak Company, Rochester, NY (United States)

The reactions of allyl chloride (C{sub 3}H{sub 5}Cl) on clean, oxygen covered, and hydroxyl covered Ag(110) are investigated with temperature-programmed desorption and electron energy loss vibrational spectroscopy. Allyl chloride adsorbs molecularly at 110 K on all three surfaces. On clean Ag(110), it dissociates upon heating to {approximately}180 K to form {eta}{sup 3}-C{sub 3}H{sub 5} ({pi}-allyl) and adsorbed Cl. The allyl intermediate is stable until {approximately}280 K, where it dimerizes to 1,5-hexadiene, which desorbs near 310 K. In the presence of adsorbed oxygen, {pi}-allyl just above 200 K, forming allyl alcohol (C{sub 3}H{sub 5}OH), which reacts subsequently with other hydroxyl or {pi}-allyl groups to form water, propylene, and acrolein (C{sub 3}H{sub 4}O). On the hydroxyl covered surface the combustion steps are circumvented and insertion to form allyl alcohol occurs directly. The thermochemistry of these reactions and their relevance to propylene oxidation on silver are discussed.

• OSTI ID: 141423
• Report Number(s): CONF-930304--
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALLYL RADICALS
CHEMICAL REACTIONS
ORGANIC CHLORINE COMPOUNDS
OXIDATION
PROPYLENE
SILVER
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE RANGE 0273-0400 K