用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基...用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基催化剂进行了表征. X 射线衍射和扫描电子显微镜检测结果表明：助剂的加入对催化剂的形貌影响不大，仍为片状结构；平均粒径为5~10 nm.程序升温还原和脱附表征结果表明：助剂 Li，Sr并未进入 NiO 晶格；而助剂 Y，Fe，La 与 Ni 之间具有相互作用，因而影响催化剂的理化性质和催化活性.其中， Fe 掺杂的片状氧化镍催化剂对乙烯的选择性和收率均有所改善，340℃时 NiFeO 催化剂上的乙烯收率可达18.2%.展开更多
RE-NiO （RE=La, Nd, Sm, Gd） catalysts were prepared by a modified sol-gel method and characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, BET surface area analysis, H2 temperature-pro...RE-NiO （RE=La, Nd, Sm, Gd） catalysts were prepared by a modified sol-gel method and characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, BET surface area analysis, H2 temperature-programmed reduction （H2-TPR）, and O2 temperature-programmed desorption （O2-TPD）. The oxidative dehydrogenation of ethane （ODHE） to ethylene was applied to evaluate catalytic performance of the samples. The results showed that the doping of RE affected the physicochemical properties of the catalysts. The strong interaction between Gd and NiO played an important role in the lessened reducibility and the distribution of adsorbed oxygen species, consequently influenced the catalytic performance. The best yield to ethylene of 29% was obtained over the Gd-NiO catalyst with an ethane conversion of 56%.展开更多
文摘用均匀沉淀法制备了片状复合氧化镍 NiMO（M = Li，Sr，Y，Fe，La）催化剂，并研究了其对乙烷氧化脱氢制乙烯的催化性能.采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、程序升温还原（H2-TPR）和程序升温脱附（O2-TPD）等方法对镍基催化剂进行了表征. X 射线衍射和扫描电子显微镜检测结果表明：助剂的加入对催化剂的形貌影响不大，仍为片状结构；平均粒径为5~10 nm.程序升温还原和脱附表征结果表明：助剂 Li，Sr并未进入 NiO 晶格；而助剂 Y，Fe，La 与 Ni 之间具有相互作用，因而影响催化剂的理化性质和催化活性.其中， Fe 掺杂的片状氧化镍催化剂对乙烯的选择性和收率均有所改善，340℃时 NiFeO 催化剂上的乙烯收率可达18.2%.
基金Project supported by National Natural Science Foundation of China(21003108)
文摘RE-NiO （RE=La, Nd, Sm, Gd） catalysts were prepared by a modified sol-gel method and characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, BET surface area analysis, H2 temperature-programmed reduction （H2-TPR）, and O2 temperature-programmed desorption （O2-TPD）. The oxidative dehydrogenation of ethane （ODHE） to ethylene was applied to evaluate catalytic performance of the samples. The results showed that the doping of RE affected the physicochemical properties of the catalysts. The strong interaction between Gd and NiO played an important role in the lessened reducibility and the distribution of adsorbed oxygen species, consequently influenced the catalytic performance. The best yield to ethylene of 29% was obtained over the Gd-NiO catalyst with an ethane conversion of 56%.
