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The homogeneous reaction CD 4 + NH 3 → CD 3 H + NH 2 D: The effect of ethane impurities
Author(s) -
Lifshitz Assa,
Schechner Pinhas
Publication year - 1975
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550070604
Subject(s) - chemistry , homogeneous , methane , impurity , argon , ammonia , activation energy , analytical chemistry (journal) , reaction mechanism , inorganic chemistry , catalysis , thermodynamics , organic chemistry , physics
The homogeneous exchange reaction between tetradeutero methane and ammonia was studied behind reflected shocks in a single‐pulse shock tube over the temperature range of 1300–1800°K. The rate of production of CD 3 H at the early stages of the reaction in mixtures ranging between 1‐4.5% NH 3 and 1–4.3% CD 4 in argon is given by d [CD 3 H]/ dt = k b [CD 4 ] 0 [NH 3 ] 0 , where k b =8 × 10 16 exp (−65.3 × 10 3 / RT ) cm 3 /mole·sec. This activation energy is considerably lower than the one that may be expected on the basis of a pure free radical mechanism. It is rationalized by C 2 D 6 impurities in the methane. No clear answer can be obtained regarding the role of a four‐center intermediate in this reaction.