燃料化学学报2016，Vol.44Issue(11)：1334-1340,7.
Li含量对Li/MgO丙烷氧化脱氢制烯烃反应催化性能的影响
Influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins
摘要
Abstract
A series of Li/MgO catalysts with different Li loadings were prepared by incipient wetness impregnation method and characterized by TG-DTA, N2 sorption and XRD; two modes for propane adsorption on Li/MgO were considered by calculation with Material Studio and the influence of Li loading on the catalytic performance of Li/MgO in the oxidative dehydrogenation of propane to olefins was investigated. The result indicated that with the increase of Li loading, the conversion of propane and the selectivity to C2 H4 , C2 H6 , CH4 , COx increases at first, reaches the highest values at a Li loading of 3% and then decreases with further increasing the Li loading, whereas the selectivity to propene changes in an opposite trend. The adsorption and dehydrogenation of propane on Li/MgO surface are controlled by both thermodynamic and kinetic factors, whilst the dispersion of the active Li+O- sites is related to the loading of Li. Over the highly-dispersed active Li+O-sites, the dehydrogenation is thermodynamically controlled, which favors the formation of propene, whereas over the poorly-dispersed Li+O- sites, the reaction is dominated by the kinetic factor, leading to a high selectivity to ethene and other by-products.关键词
丙烷/氧化脱氢/Li/MgO/烯烃/Li含量/分散度Key words
propane/oxidative dehydrogenation/Li/MgO/olefins/Li loading/dispersion分类
能源科技引用本文复制引用
吴一敏,李硕,李春义..Li含量对Li/MgO丙烷氧化脱氢制烯烃反应催化性能的影响[J].燃料化学学报,2016,44(11):1334-1340,7.基金项目
The project was supported by the Key Project of National Nature Science Foundation of China Petroleum and Chemical Joint Funds (U1362201).国家自然科学基金(石油化工联合基金重点支持项目)(U1362201)资助本文的英文电子版由Elsevier出版社在ScienceDirect上出版(http://www. sciencedirect. com/science/journal/18725813) （U1362201）
