Thermal Decomposition Studies of Halogenated Organic Compounds

CH3 + Cl = CH3Cl: RRKM/master equation modeling

“…Later, Lim and Michael [13] reported the same data in the form of a second-order rate constant, (k/[Ar]) (cm 3 molecule −1 s −1 ) = 1.09 × 10 8 exp (29325/T ). This same value was listed by Michael and Kumaran [14] as well. (This latter value is about 35%-40% smaller than the first-order value at 300 Torr, about 3%-8% smaller at 450 Torr, and 22%-30% bigger at 600 Torr.)…”

“…Data are color coded so that pink refers to 300 Torr, green to 450 Torr, and blue to 600 Torr. The data points are from Lim and Michael [12], the solid lines are the suggested fits in Michael and Kumaran [14], the dotted lines are from the expression in Parker et al [15], and the dashed lines were computed in this work. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.…”

“…This value of E d = 694 for Ar at 300 K is 1.7 times the value for He at 300 K. This is not too far from the 1.5 ratio in the CH 4 system. Figure 2 shows the values at 300, 450, and 600 Torr Ar from the expression given by Michael and Kumaran [14], the data from Lim and Michael [12] (kindly provided by Joe Michael), the expression given by Parker et al [15], and calculations performed in this work as described earlier. It would seem that these latter calculations accommodate the data as well as the expressions from Michael and Kumaran [14], both being well within the scatter of the data points, whereas the expressions given in Parker et al [15], in contrast to their Fig.…”

“…The most recent report, that of Parker et al [15], describes experimental determination of the rate coefficient for the reaction of CH 3 with Cl in He at temperatures of 202, 250, and 298 K and pressures of 0.3 < p (Torr) < 2.0. In this paper, they also report some, but not all, parameters used in a master equation simulation of these data, and of data on the decomposition reported by others [10][11][12][13][14], using a code not easily available.…”

Destructive adsorption of carbon tetrachloride on nanometer titanium dioxide

“…Methods for the disposal of CCl 4 include incineration 6 and photodecomposition. 7 Incineration is presently the most widely used method.…”