Effects of Zr, Al, and Mordenite on Pt-MCM-48 catalyst in n-heptane isomerization: Preparation, characterization and catalytic performance

Abstract

Abstract Herein, platinum loaded on various catalysts, MCM-48-Mordenite, Al-MCM-48, Al-MCM-48-Mordenite, Zr-MCM-48, and Zr-MCM-48-Mordenite has been synthesized and investigated for n-heptane isomerization reaction at four different temperatures. The XRD, FT-IR, UV-Vis DRS, NH3-TPD, and BET analysis characterized the structural characterization and acid distribution of these catalysts. The Pt/Mordenite catalyst showed higher hydrogenation and cracking activity while the hybrid catalysts showed better isomerization selectivity. The best catalytic behavior was obtained by Pt/Al-MCM-48-Mordenite catalyst at 200°C, with suitable n-heptane conversion (78.8%) and the highest isomer selectivity (81.9%). The maximum isomerization selectivity as well as the maximum yield of multi branched isomers probably not only due to its suitable acidity and large pores but also due to higher metal dispersion. This result indicates that the Pt/Al-MCM-48-Mordenite catalyst can be a hopeful candidate for good n-heptane isomerization catalysts.