Abstract
ZSM-5 zeolite samples containing Pt and a second metal (Sn, Cu or Cr) were prepared by different impregnation procedures. All these catalysts were highly active in the transformation of 1-hexene. A great variety of hydrocarbons were obtained, whose proportion depended on the particular catalyst and the reaction conditions. In general, low temperatures (250 °C) favored the double bond shift reaction, whereas medium temperatures (350 °C) predominantly led to cracking and skeletal isomerization. However, cracking was the major reaction at temperatures above 450 °C. The addition of the second metal decreased the hydrogenating activity of Pt and so olefins constituted a considerable fraction in the product. The use of nitrogen as a carrier gas instead of hydrogen favored the formation of both internal and branched olefins while reducing cracking. The reaction products are interesting for their use in gasoline blending.
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