Abstract
The kinetics of the gas phase decomposition and formation reactions of nitrous acid, 2HONO = NO + NO/sub 2/ + H/sub 2/O (k/sub 1/, k/sub 2/), have been investigated in a Pyrex reactor at HONO partial pressures of 0.05 to 1.0 Torr and total pressures of 5 to 50 Torr using a mass spectrometer detector. The reactions were determined to be heterogeneous under all surface conditions tested. The best upper limits to the homogeneous rate constants at 300/sup 0/K were k/sub 1/ less than or equal to 1 x 10/sup -20/ cm/sup 3//molecule s and k/sub 2/ less than or equal to 4.4 x 10/sup -40/ cm/sup 6//molecule/sup 2/s. The kinetics of the heterogeneous reactions were examined, and a rate law is proposed.
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