Article,
Flow-Tube Investigation of the High-Temperature Reaction between BCl3 and NH3
J. Phys. Chem. A, 102 (40): 7804--7812 (1998)
Abstract
The reaction between BCl3 and NH3 to produce dichloroboramine (Cl2BNH2)
and HCl was probed using a flow-tube reactor interfaced to a molecular-beam
mass-sampling system. A composite method that couples the detailed
simulation of the fluid mechanics and chemical reactions occurring
in the flow tube to an algorithm for nonlinear least-squares optimization
was used to extract the kinetic parameters from the experiment. The
rate constant for this gas-phase reaction is k (cm3 mol-1 s-1) =
4.21 ? 1011 exp-(8350 cal mol-1)/(RT) with an estimated uncertainty
of 10-15% over the temperature range 670-920 K. The results indicate
that surface reactions involving BCl3 and NH3 occur in the flow tube,
but their contributions to the observed chemical behavior of the
system can be quantified and therefore do not affect the kinetic
measurements reported here. In addition, the low-energy barrier to
this gas-phase reaction has important implications for the chemical
vapor deposition of boron nitride from BCl3 and NH3.
