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Reaction of H with C2N2 at pressures near 1 torr

✍ Scribed by L. F. Phillips

Publisher: John Wiley and Sons
Year: 1978
Tongue: English
Weight: 257 KB
Volume: 10
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550100810

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✦ Synopsis

The rate of disappearance of C2N2 in the presence of a large excess of H atoms has been measured in a discharge-flow system at pressures near 1 torr and temperatures in the range of 282-338 K. Under these conditions the reaction has a small negative temperature coefficient. A transition from second-order to third-order kinetics with decreasing pressure occurs a t pressures near 1 torr. The results are discussed in terms of the mechanism

Hz + HCzN; -H2 + HCZNZ ( )

where k7 = (1.5 f 0.2) X cm3/molec1~sec is found for the forward rate of reaction ( ). The results also give k 7 k ~/ k -~ = 3.7 X lO-3I cm6/molec2-sec and k7k9/k--7 = 3.0 X cm6/molec2-sec, the first being probably an upper limit and the second probably a lower limit; hence k&g = 12 is found as an upper limit.

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