Abstract
A knitted silica fiber was prepared and employed as a support material for platinum catalysts. Different knitted silica-fiber supported platinum catalysts were prepared using several platinum precursors. The catalysts were characterized by N2 physisorption, H2 adsorption, NH3/H2/o-xylene temperature-programmed desorption, scanning electron microscopy−energy-dispersive X-ray analysis, and X-ray photoelectron microscopy. Catalyst activity was investigated in the gas-phase hydrogenation of o-xylene at 360−460 K with o-xylene and hydrogen partial pressures of 0.06 and 0.36−0.73 bar. High o-xylene conversions (up to 99%) to cis- and trans-1,2-dimethylcyclohexane were achieved. The specific surface area and pore volume of the support and the platinum precursor affected the catalyst performance. A catalyst prepared from platinum nitrate with a metal loading of 5 wt % exhibited the highest hydrogenation activity. A maximum in hydrogenation activity vs temperature was observed, which was caused by decreased surfac...
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