Other
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confetd08v&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Other
Matrix/Condensed Phase
Scientific paper
In all previous experimental studies of the thermal decomposition of acetaldehyde (CH_3CHO), the products were presumed to be CH_3 + CHO. These species result from cracking of the weakest bond. Other routes are possible: (DH298(CH_3-CHO) = 84.8 ± 0.2 kcal mol-1; DH298(CH_3CO-H) = 89.4 ± 0.3 kcal mol-1; DH298(H-CH_2CHO) = 92 ± 2 kcal mol-1. This work explores the possibility of other thermal decomposition pathways, that result via C-H bond scission. We have used a resistively heated SiC tubular reactor with a 65 μsec residence time to study the thermal cracking of acetaldehyde. The decomposition products are identified by two independent techniques: 118.2 nm (10.487 eV) VUV photoionization mass spectroscopy and infrared absorption spectroscopy in a cryogenic matrix. The observed dissociation channels seem to be:
CH_3CHO + Δ →
CH_3CO + H → CH_2=CHOH → CH_2=C=O → CH_3 + HCO
Daily John W.
Ellison Barney G.
Nimlos Mark R.
Piech Krzysztof
Stanton John F.
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