Branching ratios for the reactions of 1-butene, 1,3-butadiene, and benzene with stoichiometric tantalum oxide clusters (TaO2-3 +, Ta2O4-5 +, and Ta3O7-8 +) are reported. The major reaction product for most of the clusters is cracking of the C2-C3 bond of 1-butene and 1,3-butadiene to produce TaxOyC2H4 +. Additionally, Ta2O4 + was the most reactive cluster toward cracking the C2-C3 bond of both 1-butene and 1,3-butadiene. For a majority of these clusters there were additional cracking channels to produce TaxOyCH3 + and TaxOyC3Hz +, where Z = 5-6, which occur under multiple collision conditions for 1-butene and 1,3-butadiene. Under multiple collision conditions, TaO2 +, Ta2O4 +, and Ta3O7 + exhibited the reaction channels of TaxOyC5H9 + and TaxOyC6H10 + when reacted with 1-butene. In reactions with 1,3-butadiene, secondary reaction channels of TaxOyC5H7 + and TaxOyC6H8 + were also observed for TaO2 +, Ta2O4-5 +, and Ta3O7 +. Additionally, under multiple collision conditions, TaO2 + and Ta2O4 + also displayed reaction channels of TaxOyC7H9 + and TaxOyC8H10 +. Reactions of most of the stoichiometric tantalum oxide clusters with benzene showed a cracking channel forming TaxOyC4H4 + and a dehydration channel to form TaxOy-1C6H4 +. The most reactive cluster toward cracking benzene was Ta3O8 +, and the most reactive cluster toward the dehydration reaction was TaO2 +. Reactions of the aforementioned unsaturated hydrocarbons with oxygen-rich clusters (TaO4-5 +, Ta2O6-7 +, and Ta3O9-10 +) are also reported. The major reaction channel of most of these clusters involves loss of molecular oxygen to form the smaller, more stable stoichiometric clusters, which then proceed to react with or associate the hydrocarbon gas.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry