Abstract
The activation of oxygen species is always a challenging problem in the oxidative dehydrogenation (ODH) of 1-butene with CO2. The oxygen species play an important role in improving the conversion, yield, selectivity, and stability of FeAlOx-based catalysts. In this paper, the framework-confined (FC) strategy was used to active the oxygen species. The changed crystalline phase from Fe2O3 to FeAlO4 illustrated the introduction of Fe species destroyed the Al2O3 lattice and more active oxygen species were released. Compared with the WI-Fe2O3/Al2O3 samples, the ratio of active lattice oxygen was increased from 0.03 to 0.1 and the ratio of Fe3+ was also increased from 0.63 to 0.76 in the FC-FeAlOx samples. After doping with other metal species, the ratio of active lattice oxygen was further increased. The 1-butene conversion could reach 80 % and the 1, 3-Butadiene selectivity could reach 33 % over the FC-FeCrAlOx samples. Besides this, the FC-FeCrAlOx samples showed an outstanding thermal stability, which might be caused that Cr species could reduce the coke formation. The FC-FeCaAlOx samples had a higher utilization rate of CO2, which might be caused that Ca species could improve the basicity of the catalyst.
Keywords Plus：1,3-BUTADIENE；ETHYLBENZENE；REDUCTION；HYDROGENATION；SUPPORT；ALUMINA；GOLD
Published in BIOMATERIALS SCIENCE，10.1039/d3bm01326j