(617bc) Kinetic Study for Hydrogenation of Toluene to Methylcyclohexane Over Titanium Substituted SBA-15 Supported Pt-Pd Catalysts

SBA-15, Ti-SBA-15 materials were synthesized and employed as supports for Pt-Pd catalyst. Supports and catalysts were thoroughly characterized by using inductively coupled plasma atomic emission spectroscopy (ICP-AES), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDX), temperature-programmed desorption (TPD), Brunauer-Emmett-Teller (BET) surface area, and CO chemisorptions techniques. The detail kinetic study of hydrogenation of toluene over a (0.15 wt %) Pt- (0.15 wt %) Pd / SBA-15 and (0.15 wt %) Pt- (0.15 wt %) Pd / Ti-SBA-15 was performed in a continuous upflow stainless steel catalytic fixed bed reactor at varied hydrogen to toluene mole ratio, weight hourly space velocity (WHSV), hydrogen partial pressure and temperature. It was observed that toluene conversion was increased on increasing hydrogen to toluene mole ratio and H₂ partial pressure, and decreased with increasing WHSV. The conversion is dependent on temperature and shows a well-defined maximum. It was found that incorporation of Ti into the SBA-15 structure increased the toluene conversion and reducibility of the catalysts. It was found that (0.15 wt %) Pt- (0.15 wt %) Pd / Ti-SBA-15 catalysts showed better performance in hydrogenation of toluene than the (0.15 wt %) Pt- (0.15 wt %) Pd / SBA-15 catalyst.

Keywords: SBA-15, Ti-SBA-15, Pt-Pd/ Ti-SBA-15.

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