Abstract
Al2O3−TiO2 and Al2O3−TiO2−SiO2 (denoted as AT and ATS) composite oxides were synthesized by the sol−gel method, which were used as supports for bimetallic Pt−Pd catalysts. The typical physicochemical properties of the catalyst samples were characterized by means of N2 adsorption, UV−vis diffuse reflectance spectroscopy (DRS), and X-ray diffraction (XRD). The diesel hydrodearomatization (HDA) and hydrodesulfurization (HDS) activities of the catalysts were evaluated using a microreactor system. In comparison to the Pt−Pd/AT catalysts, all of the Pt−Pd/ATS catalysts showed much higher HDA activities. A 100 h test showed that the Pt−Pd/ATS catalyst had a high equilibrium HDA activity, with 432 ppm sulfur diesel. The enhanced HDA activity and sulfur tolerance of Pt−Pd/ATS were likely attributed to the incorporations of Ti and Si into Al2O3, which optimized the interaction between the catalyst support and active metals.
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