Two series of chromium–zirconium mixed oxide catalysts with different Cr/Zr molar ratio are prepared by co-precipitation method. Porous structure the is studied low-temperature N2 adsorption–desorption. Phase composition and chromium states in characterized X-ray diffraction (XRD), UV-visible spectroscopy, temperature-programmed reduction hydrogen (TPR-H2). The tested non-oxidative dehydrogenat...

The oxidative dehydrogenation (ODH) of propane to propylene by supported vanadia catalysts has received much attention in recent years, but different reactivity trends have been reported for this catalytic reaction system. In the present investigation, the origin of these differing trends are investigated with synthesis of supported V/SiO2, V/TiO2, and V/Al2O3 catalysts prepared with three diff...

The molecular structures, oxidation states, and reactivity of 3 and 6% CrO3/ZrO2 catalysts prepared by incipient wetness impregnation were examined under different conditions. The in situ Raman spectroscopic studies under dehydrated conditions reveal that the 3 and 6% CrO3/ZrO2 catalysts possess equal amounts of monochromate and polychromate species. Consequently, monolayer coverage on this ZrO...

The search for inexpensive, environmentally friendly, and highly effective catalysts to activate C-H bonds in propane dehydrogenation (PDH) reactions is still a major challenge. Co-based have gained significant attention recent years due their excellent ability high selectivity towards olefins, despite being non-noble unfriendly metal. However, further improvements are necessary practical utili...

This work aims at providing insight into the deactivation mechanism of Pd-based membranes in propane dehydrogenation processes. Thermogravimetric analysis (TGA) experiments were conducted to study adsorption and coking propylene over conventional thin layer (TL) double-skinned (DS) under several operating conditions. A mechanistic monolayer-multilayer coke growth model was selected mathematical...

Propane dehydrogenation is an important field of research due to increasing world-wide demand propene while classical production routes through naphtha cracking are in decline. In that context, silica-supported Ga(III) sites, synthesized from surface organometallic chemistry principles, show high selectivity and stability the propane reaction. This performance significant contrast reported fast...

The on-purpose direct propane dehydrogenation (PDH) has received extensive attention to meet the ever-increasing demand of propylene. In this work, by means density functional theory (DFT) calculations, we systematically studied intrinsic coordinating effect Fe single-atom catalysts in PDH. Interestingly, N and P dual-coordinated single (Fe-N3P-C) significantly outperform Fe-N4C site catalysis ...