High-Temperature Fast-Flow Reactor Kinetics Studies of the Reactions of Al with Cl2, Al with HCl, and Wide Temperature Ranges

Article abstract of DOI:10.1021/j100340a019

The high-temperature fast-flow reactor (HTFFR) technique has been used to measure rate coefficients for the title reactions under pseudo-first-order conditions.The relative concentrations of the minor reactants (Al species) were monitored by laser-induced fluorescence.The following k(T) expressions in cm³ molecule^-1 s^-1 are obtained: Al + Cl2 -> AlCl + Cl, k₁(T) = 7.9 x 1E-10 exp(-780K/T) between 425 and 875 K; Al + HCl -> AlCl + H, k₂(T) = 1.5 x 1E-10 exp(-800K/T) between 475 and 1275 K; AlCl + Cl2 -> AlCl2 + Cl, k₃(T) = 9.6 x 1E-11 exp(-610K/T) between 400 and 1025 K.Confidence limits are given in the text.Indications are obtained that the expressions for k₁(T) and k₂(T) are approximately valid to at least 1300 and 1700 K, respectively.The reasults are discussed in terms of a harpooning mechanism and a modified form of collision theory, which takes account of long-range attractive potentials and conservation of angular momentum.