Abstract
Trimetallic Pt/Al 2O 3SnIn–Cl naphtha-reforming catalysts were characterized by 119Sn Mössbauer spectroscopy, TPR, CO chemisorption, FTIR of adsorbed CO and NH 3-TPD. TPR traces indicate that indium facilitates tin reduction and strongly interacts with platinum as well. 119Sn Mössbauer spectroscopy results show that addition of even small amount of In (0.06 wt.%) leads to the formation of a Pt 3Sn alloy. At higher indium loadings, higher amounts of Pt x Sn alloys of almost equal Pt and Sn atomic concentrations were detected. Indium also decreases the overall CO chemisorption capacity and provokes a modification of Pt electronic properties at the highest In loadings. A decrease in the acidity of the support in trimetallic catalysts is also observed by NH 3-TPD upon indium addition. These results correlate well with those from n-heptane-reforming reaction, showing that indium decreases catalyst’s overall conversion and selectivity to C 1 and C 3–C 4 paraffins and increases isomerization selectivity.
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