Support Effect of Ga-Based Catalysts in the CO2-Assisted Oxidative Dehydrogenation of Propane

Carbon dioxide (CO2) assisted oxidative dehydrogenation of propane over Ga-modified catalysts is highly sensitive to the identity support, but underlying cause support effects has not been well established. In this article, SSZ-13, SSZ-39, ZSM-5, silica and γ-Al2O3 were used load Ga species by incipient wet impregnation. The structure, textural properties, acidity Ga-based process CO2-assisted examined X-ray diffraction (XRD), nitrogen physisorption (N2 physisorption), ammonia temperature-programmed desorption (NH3-TPD), pyridine chemisorbed Fourier transform infrared spectra (Py-FTIR), OH-FTIR in situ FTIR. Evaluation catalytic performance combined with detailed catalyst characterization suggests that their activity positively associated number acid sites middle strength, confirming Lewis generated cations are active reaction. Ga/Na-SSZ-39(9) also feasible acidic strength a unique channel which conducive dissociative adsorption olefins. showed superior olefins selectivity stability at 600 ℃ compared any other catalysts. This approach quantifying structure applying it as key descriptor useful tool enable rational design next-generation