Abstract
Hydrodechlorination of carbon tetrachloride (CCl4) has been studied over 1% Pt/Al2O3prepared from various Pt precursors. The Pt/Al2O3catalyst prepared from Pt(II) precursors showed stable, high conversion of CCl4above 99% and selectivity of CHCl3above 78% at the reaction temperature of 393 K, H2/CCl4mole ratio of 9 and weight hourly space velocity of 9000 liters/kg/h. Relative to fresh catalyst, amounts of carbon and chlorine increased in catalysts which had been used for the reaction and, in particular, when the catalysts showed deactivation. Used catalyst showed a decrease in the amount of H2chemisorption and the decrease was greater for catalysts prepared from Pt(IV) precursors than those from Pt(II) precursors. The catalyst prepared by Pt(NH3)2(NO2)2indicated a retarded coke formation compared to that from H2PtCl6. From temperature-programmed reduction, temperature-programmed oxidation, and X-ray absorption fine structure measurements, it was concluded that the difference between the catalysts prepared from Pt(II) and Pt(IV) precursors was due to the different oxidation states of Pt.
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