脱氢
化学链燃烧
单层
钒
化学工程
化学
丙烯
选择性
光化学
丙烷
材料科学
催化作用
无机化学
氧气
纳米技术
有机化学
工程类
作者
Sai Chen,Chunlei Pei,Xin Chang,Zhi‐Jian Zhao,Rentao Mu,Yiyi Xu,Jinlong Gong
标识
DOI:10.1002/anie.202005968
摘要
Chemical looping provides an energy- and cost-effective route for alkane utilization. However, there is considerable CO2 co-production caused by kinetically mismatched O2- bulk diffusion and surface reaction in current chemical looping oxidative dehydrogenation systems, rendering a decreased olefin productivity. Sub-monolayer or monolayer vanadia nanostructures are successfully constructed to suppress CO2 production in oxidative dehydrogenation of propane by evading the interference of O2- bulk diffusion (monolayer versus multi-layers). The highly dispersed vanadia nanostructures on titanium dioxide support showed over 90 % propylene selectivity at 500 °C, exhibiting turnover frequency of 1.9×10-2 s-1 , which is over 20 times greater than that of conventional crystalline V2 O5 . Combining in situ spectroscopic characterizations and DFT calculations, we reveal the loading-reaction barrier relationship through the vanadia/titanium interfacial interaction.
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