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Coverage‐Dependent Behaviors of Vanadium Oxides for Chemical Looping Oxidative Dehydrogenation
Author(s) -
Chen Sai,
Pei Chunlei,
Chang Xin,
Zhao ZhiJian,
Mu Rentao,
Xu Yiyi,
Gong Jinlong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202005968
Subject(s) - dehydrogenation , chemical looping combustion , monolayer , vanadium , chemical engineering , materials science , selectivity , propene , propane , catalysis , photochemistry , inorganic chemistry , chemistry , oxygen , nanotechnology , organic chemistry , engineering
Chemical looping provides an energy‐ and cost‐effective route for alkane utilization. However, there is considerable CO 2 co‐production caused by kinetically mismatched O 2− 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 CO 2 production in oxidative dehydrogenation of propane by evading the interference of O 2− 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 V 2 O 5 . Combining in situ spectroscopic characterizations and DFT calculations, we reveal the loading–reaction barrier relationship through the vanadia/titanium interfacial interaction.