- 作者: Liaw, Biing-Jye ; Cheng, Dong-Shinh ; Yang, Sheng-Jier et al.
- 作者服務機構: 中央大學化學工程系
- 中文摘要: Magnetite (Fe/sub 3/O/sub 4/), a partially reduced iron oxide, has long been considered as inactive in the oxidative dehydrogenation of butene. By studying a clean Fe/sub 3/O/sub 4/ powder, we found that Fe/sub 3/O/sub 4/, similar to other spinel ferrites, is not only active, but also more active and selective than.alpha.-Fe/sub 2/O/sub 3/. The active site densities and the desorption temperatures of oxidation products on Fe/sub 3/O/sub 4/ were also measured. Fe/sub 3/O/sub 4/ is, however, unstable under flow reaction conditions. Even if the bulk of the oxide is stabilized in the form of Fe/sub 3/O/sub 4/ at high temperatures and low O/sub 2//C/sub 4/ rations, its surface is gradually oxidized to a form close to .alpha.-Fe/sub 2/O/sub 3/, resulting in a decrease in both the activity and selectivity. The restructuring of the Fe/sub 3/O/sub 4/ surface is temperature dependent. At 300.degree.C, the high selectivity and activity of a low-surface-area Fe/sub 3/O/sub 4/ can be long preserved even if the bulk is oxidized to .alpha.-Fe/sub 2/O/sub 3/.
- 英文摘要: --
- 中文關鍵字: Catalysis; Magnetite; Oxidative Dehydrogenation; Butene; Butadiene
- 英文關鍵字: 催化;磁鐵礦;氧化去氫作用;丁烯;丁二烯