Effect of gas diluents on assessment of kinetics in pressure response cells

✍ Scribed by R.G. Rice; L.F. Burns; R.S. Miao

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 400 KB
• Volume: 49
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(94)80021-9

✦ Synopsis

The pressure response cell (PRC) allows direct physical measurements to be used to deduce chemical rate parameters for gas-liquid reactions. The Rice-Ben&t approximation allowed both reaction order and rate constant to be found directly, provided only that a single-component gas phase existed. We examined the dynamics of PRC for the case when high concentrations of inert diluents arc present in the gas phase, so that a damping effect is introduced as a consequence of gas film resistance. The resulting nonlinear problem was solved approximately to allow parameter estimation under damped conditions. The results were used to estimate parameters for PRC experiments on the cobalt catalyzed oxidation of sulfite solutions by oxygen in the presence of varying amounts of nitrogen. The experimental results suggest that the order with respect to oxygen is unity when oxygen partial pressure is greater than 1 atm, and nearly second order when pressure is less than 1 atm.