CoO x species is firstly introduced onto MOR (Mordenite) by impregnation with microwave heating to catalyze the epoxidation of α-pinene with air. The obtained samples have been characterized by X-ray diffraction, FTIR, SEM, TEM, BET surface area, porosity by N 2 adsorption. 7%CoO x /MOR catalyst exhibits remarkably higher activity and selectivity in the epoxidation of α-pinene than that prepared by traditional heating impregnation. The epoxidation conversion of α-pinene over 7%CoO x /MOR prepared by microwave heating reaches 92.7 mol% in 4 h at 90 °C, which is nearly 1.5 times that of the catalyst by traditional impregnation. This is due to the fact that CoO x nanoparticles are produced by microwave heating and uniformly dispersed on MOR.
Co-based catalysts have shown great promise for propane dehydrogenation (PDH) reactions due to their merits of environmental friendliness and low cost. In this study, ordered mesoporous molecular sieve-supported CoOxspecies (CoOx/Al-SBA-15 catalyst) were prepared by one-step organometallic complexation. The catalysts show worm-like morphology with regular straight-through mesoporous pores and high external specific surface area. These typical features can substantially enhance the dispersion of CoOxspecies and mass transfer of reactants and products. Compared with the conventional impregnation method, the 10CSOC (10 wt.% Co/Al-SBA-15 prepared by the organometallic complexation method) sample presents a smaller CoOxsize and higher Co2+/Co3+ratio. When applied to PDH reaction, the 10CSOC delivers higher propane conversion and propylene selectivity. Under the optimal conditions (625 °C and 4500 h−1), 10CSOC achieves high propane conversion (43%) and propylene selectivity (83%). This is attributed to the smaller and better dispersion of CoOxnanoparticles, more suitable acid properties, and higher content of Co2+species. This work paves the way for the rational design of high-performance catalysts for industrially important reactions.
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