文献类型：会议论文

英文题名：Reaction mechanism and kinetics for hydrolytic dehydrogenation of ammonia borane on a Pt/CNT catalyst

作者：Chen, Wenyao[1];Li, Dali[1];Wang, Zijun[1];Qian, Gang[1];Sui, Zhijun[1];Duan, Xuezhi[1];Zhou, Xinggui[1];Yeboah, Isaac[2];Chen, De[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway

会议论文集：24th International Symposium on Chemical Reaction Engineering (ISCRE)

会议日期：JUN 12-15, 2016

会议地点：Minneapolis, MN

语种：英文

外文关键词：hydrolytic dehydrogenation of ammonia borane; Pt; CNT catalyst; reaction mechanism; kinetics

摘要：A reaction mechanism is proposed for hydrolytic dehydrogenation of ammonia borane on a Pt/CNT catalyst. A combination of thermodynamic analysis and FTIR measurement reveals that B-containing byproducts are mainly in the form of an NH4B(OH)(4)-B(OH)(3) mixture rather than NH4BO2 reported previously. The revised main reaction is NH3BH3+4H2ONH4+3H2, involving the B-H, B-N, and O-H bond cleavages. Isotopic experiments using D2O instead of H2O as reactant or introducing D-2 into the reaction atmosphere suggest the O-H bond cleavage being in the rate-determining step, and an unfavorable occurrence of the chemisorbed H2O dissociation (i.e., the direct O-H bond cleavage), respectively. Different reaction pathways with indirect O-H bond cleavages are analyzed, and then NH3BH2*H2O*BH2(OH)*+H* is suggested as the rate-determining step. Subsequently, a Langmuir-Hinshelwood kinetic model is developed, which fits well with the experimental data. (c) 2016 American Institute of Chemical Engineers AIChE J, 63: 60-65, 2017