文摘
The optimization of bifunctional performance of catalysts for n-heptane isomerization is one of the main processes in the refining industry. In this work, Pt/ZrO2-HMS catalysts with various amounts of Si/Zr, promoted by MoOx, were studied and compared with their undoped equivalents for n-heptane isomerization reaction at 200–350 °C. These catalysts were characterized by X-ray diffraction, X-ray fluorescence, Fourier transform infrared, Ultraviolet–Visible diffuse reflectance, temperature‐programmed desorption of NH3, infrared spectroscopy of adsorbed pyridine, H2 chemisorption, nitrogen adsorption–desorption, scanning electron microscopy and thermogravimetric techniques. The kinetics of n-heptane isomerization with these catalysts was evaluated over a wide range of conditions as 200 to 350 °C reaction temperature, 20 to 45 mL min−1 flow rate of hydrogen and 1 to 4 mL h−1 flow rate of n-heptane. The most desirable results, as a maximum i-C7 selectivity (81.8%) and no aromatic products, were observed for Pt–MoOx/ZrO2-HMS with Si/Zr = 5 at T = 200 °C.
