期刊
JOURNAL OF CATALYSIS
卷 377, 期 -, 页码 438-448出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2019.07.050
关键词
Oxidative dehydrogenation; Ethylene; N2O; Nickel oxide; Layered double hydroxide; Oxygen species
资金
- National Natural Science Foundation of China [21576251, 21573232, 21676269, 21878283]
- National Key R&D Program of China [2016YFA0202-801]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020100]
- Youth Innovation Promotion Association CAS [2017223]
Oxidative dehydrogenation (ODH) of ethane by a soft oxidant is a thermally favorable process for the valorization of ethane and the improvement of ethylene selectivity. Here, Ni-Al mixed oxides (Ni-x/Al-MO) derived from layered double hydroxides (LDH) were used for ODH of ethane by the N2O oxidant for the first time. The selectivity of ethylene improved by about 30% over Ni3Al-MO with 80 wt% NiO loading compared with that over NiO/Al2O3 with the same loading. The conversion of ethane reached 35% with the ethylene selectivity of 70% at 480 degrees C under complete abatement of N2O. Detailed characterizations showed that the LDH precursor facilitated the high dispersion of NiO with good incorporation of Al cations in Ni3Al-MO, which promoted the isolation of electrophilic oxygen (O-) species. The isolated O- species were favorable for selective conversion of ethane to ethylene. Furthermore, they also led to weaker adsorption of ethylene and decrease the consecutive oxidation ability compared with the adjacent O- species in NiO/Al2O3. As a result, the selectivity of ethylene increased significantly by using the Ni-Al mixed oxides. (C) 2019 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据