|
|||||
|
|
Isomerization of n-butane by sulfated zirconia: the effect of calcination temperature and characterization of its surface acidity |
|
| Authors: | Kiyoyuki Shimizu Noriaki Kounami Hiroyasu Wada Tetuya Shishido Hideshi Hattori |
| Affiliation: | (1) Energy Resources Department, National Institute for Resources and Environment, AIST, 16-3 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan;(2) Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Noda, Chiba, 278-8510, Japan;(3) Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima, 739-8511, Japan;(4) Center for Advanced Research of Energy Technology (CARET), Hokkaido University, Sapporo, 060-8628, Japan |
| Abstract: | The distributions of Brønsted and Lewis acid sites of different acid strengths on sulfated zirconia calcined at 450–650°C were measured by IR of adsorbed pyridine to elucidate the active sites for butane isomerization. The total numbers of Brønsted acid sites were largest when the catalyst was calcined at 500°C. The total numbers of Lewis acid sites increased with increasing calcination temperature to a maximum at 650°C. The catalytic activity in skeletal isomerization of butane correlated well with the number of Brønsted acid sites but not with the number of Lewis acid sites. The active sites were completely blocked by pyridine irreversibly absorbed at 350°C. We suggest that the strong Brønsted acid sites, which are able to retain pyridine against evacuation at 350°C, act as active sites for butane isomerization on sulfated zirconia. |
| Keywords: | sulfated zirconia isomerization of n-butane Brø nsted acidity Lewis acidity |
| 本文献已被 SpringerLink 等数据库收录！ | |