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Novel Pt ion-exchanged Ga-silicate bifunctional catalysts have been developed which produce aromatics from propane more actively and selectively than previous catalysts such as Ga ion-exchanged and Pt ion-exchanged H-ZSM-5.Much attention has recently been given to the conversion of lower paraffins (such as ethane, propane, and butane) into aromatics, and Ga and Zn ion-exchanged H-ZSM-5 (Ga/H-ZSM-5 or Zn/H-ZSM-5) have been found useful for this reaction.' We have also shown that Pt ion-exchanged H-ZSM-5 (Pt/H-ZSM-5) is effective for the reaction.2 By using the

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The conversion of light olefins such as ethylene, propylene, and butenes to gasoline was investigated with various metallosilicates having a pentasil pore-opening structure. The metallosilicates were prepared using a novel rapid crystallization method by replacing the Al ingredient in the H-ZSM-5 with various metal salts at the gel formation stage. The silicates of Al(i.e., H-ZSM-5), Ga, V, Cr, and Zr were not highly effective for selective conversion to liquid products because of a significant formation of gaseous C1-C4 paraffins accompanied with the formation of aromatics. On the other hand, Fe-silicates were highly effective for selective formation of liquid products in the gasoline fraction.