Highly active Ga 2 O 3 nanoparticles catalysts were prepared by one-step oxidative decomposition of gallium nitrate with sucrose-derived carbon foams (SCF) template. The catalysts were investigated by XRD, Ar physisorption, SEM-EDS, HRTEM, TGA, NH 3 -TPD and 71 Ga MAS NMR. The addition of sucrose facilitated the higher surface area of Ga 2 O 3 nanoparticles and morphological transformation from bulk to flake due to the structure-directing role of the sucrose solution. Moreover, the weak-medium surface acid sites increased by adding sucrose properly, which was related to the larger number of tetrahedral Ga 3+ cations. The optimum catalytic activity was achieved over S X CF-Ga 2 O 3 catalysts at the sucrose/Ga 2 O 3 molar ratio of 6 with the propane conversion of 46.63% and propene selectivity of 88.18%.
Abstract-The effects of chemical composition and preparation conditions, especially water content, calcination atmosphere and oxygen content on the catalytic performances of MoVTeNbO mixed oxide catalyst system for the selective oxidation of propane to acrylic acid have been investigated and discussed.Among the catalysts studied, the Mo1.0V0.3Te0.23Nb0.12Ox catalyst calcined in inert atmosphere under a temperature of 600°C showed the best performance in terms of propane conversion and selectivity to acrylic acid. The results revealed that proper chemical composition, calcination atmosphere, water content and oxygen content affected greatly the catalysts in many ways including structure, chemical composition, which are related to their catalytic performances, the 78.1% propane conversion and 61.0% one-pass yield to acrylic acid can be achieved at the same time.
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