Oxygen species on NiO/Al2O3 and their reactivities |
| |
Authors: | Xinjie Zhang Yunqing Gong Gang Yu Youchang Xie |
| |
Institution: | Institute of Physical Chemistry, Peking University, Beijing 100871, PR China |
| |
Abstract: | Oxygen species on fresh and treated NiO/Al2O3 and their activities for oxidation of ethane and ethylene were investigated using catalytic property measurements, ethane and ethylene pulse experiments and O2–TPD–MS experiments. The results revealed that there are two kinds of active oxygen species (the more active one and the less active one) on fresh NiO/Al2O3 catalyst, but there is only one active oxygen species, the less active one, on treated NiO/Al2O3 catalyst. The more active oxygen species can convert ethane or ethylene to carbon dioxide by one step while the less active one can only convert ethane to ethylene, but cannot convert ethane and/or ethylene to carbon dioxide. The more active oxygen species can be removed from the catalyst by heating from 350 to 850 °C. The amounts of desorption oxygen on the catalysts are proportional to their selectivity to carbon dioxide. |
| |
Keywords: | Oxygen species Ethane Ethylene Oxidative dehydrogenation NiO/Al2O3 |
本文献已被 ScienceDirect 等数据库收录! |
|