Constructing mesoporous FeAlOx based catalysts through framework-confined strategy with superior performance for the oxidative dehydrogenation of 1-butene with CO2

The activation of oxygen species is always a challenging problem in the oxidative dehydrogenation (ODH) of 1-butene with CO 2 . The oxygen species play an important role in improving the conversion, yield, selectivity, and stability of FeAlO x -based catalysts. In this paper, the framework-confined (FC) strategy was used to active the oxygen species. The changed crystalline phase from Fe 2 O 3 to FeAlO 4 illustrated the introduction of Fe species destroyed the Al 2 O 3 lattice and more active oxygen species were released. Compared with the WI-Fe 2 O 3 /Al 2 O 3 samples, the ratio of active lattice oxygen was increased from 0.03 to 0.1 and the ratio of Fe 3+ was also increased from 0.63 to 0.76 in the FC-FeAlO x 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-FeCrAlO x samples. Besides this, the FC-FeCrAlO x samples showed an outstanding thermal stability, which might be caused that Cr species could reduce the coke formation. The FC-FeCaAlO x samples had a higher utilization rate of CO 2 , which might be caused that Ca species could improve the basicity of the catalyst.