Vanadium Oxide Supported on Mesoporous MCM-41 as Selective Catalysts in the Oxidative Dehydrogenation of Alkanes

Synthesis of Three-Dimensionally Ordered Macroporous NiCe Catalysts for Oxidative Dehydrogenation of Propane to Propene

“…Based on previous reports [33], the bulk ceria should be reduced by hydrogen above 700 °C; therefore, its Pure 3DOM CeO 2 showed only a wide and low intensity reduction peak centered at 564 • C in the investigated temperature range, correlated with the reduction of the surface ceria. Based on previous Catalysts 2018, 8,19 7 of 12 reports [33], the bulk ceria should be reduced by hydrogen above 700 • C; therefore, its reduction peak could not be observed in the present study. The reduction peak of the surface Ce-species for the NiCe catalysts were almost invisible, possibly due to such above surface reduction peak being overlapped by the more intense TPR profile of nickel species.…”

“…However, these catalysts are usually conducted at relatively higher temperatures (above 500 • C), which cause the occurrence of undesirable combustion and then restrain propene formation. In the past few decades, great efforts have been dedicated to the improvement of vanadium and molybdenum-based ODH catalysts for highly preferable alkene yield [6][7][8][9][10], but propane conversion was normally unsatisfactory at the lower temperature of 400 • C using the catalysts above. Further studies are still required to develop highly active catalysts used under the mild reaction conditions in the ODH process.…”

Combined Oxidative and Non-oxidative Dehydrogenation of n-Butane Over VOX Species Supported on HMS

“…The average pore diameter of pure HMS support was 6.8 nm with the total pore volume of 0. The DR UV-Vis spectra of dehydrated samples measured in the range of 1.45-6.5 eV [25,36,49]. For quantitative analysis of all three types of surface vanadium complexes, the spectra were deconvoluted into individual bands.…”

Anomalous reactivity of supported V2O5 nanoparticles for propane oxidative dehydrogenation: influence of the vanadium oxide precursor

“…Some researchers have reported a significant increase in the catalytic turnover frequency (TOF: reaction rate per VO x site) with increasing vanadia loading on the support 8,[16][17][18]20,22,24 while other researchers have found a relatively constant TOF with increasing vanadia loading on the supports. 19,21,23,[25][26][27][28][29][30][31][32] A close examination of the propane ODH catalysis literature reveals several different catalyst synthesis methods have been used by the researchers in this field and it is important to better understand the influence of the different preparation methods on the different supported VO x structures and their specific TOF values. To address the influence of the synthesis method upon the molecular structure and specific activity of the different supported VO x phases for propane ODH, a series of supported V/SiO 2 , V/TiO 2 , and V/Al 2 O 3 catalysts were prepared by three different methods and precursors (2- …”