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1 Journal of Ecological Engineering

1 2025

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Synthesis of sulfated zirconia-HY zeolite catalysts doped by platinum metal for hydroisomerization reaction

Al-Taweel Sura K., Al-Jendeel Haider A., Al-Tabbakh Ban A.

Journal of Ecological Engineering

2025

Vol. 26, nr 3

147--158

In this study, active catalysts of platinum supported on sulfated zirconia and HY zeolite (Pt/SZ-HY), and platinum supported on sulfated zirconia – mHY zeolite (Pt/SZ-mHY) were prepared using two different mesopore HY zeolite and sulfated zirconia (SZ). The synthesized catalysts were characterized by X-ray diffraction (XRD), Fourier transfer infrared spectroscopy (FTIR), BET surface area and pore volume, field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) analysis. The characterisation results showed that adding sulfated zirconia to HY zeolite as a composite increased the active sites on the catalyst and increased the activity of isomerization. Isomerization experiments were studied using a different range of temperature (140–200 °C), constant pressure and LHSV of 15 bar and 1 hr-1, respectively. The results showed Pt/SZ-HY composite catalyst gives 17.95 mol% conversions for n-hexane and 27.5 mol% for n-heptane at optimum conditions of 160 °C, 15 bar and LHSV of 1 hr-1. On the other hand, the composite catalyst Pt/SZ-mHY with smaller pore size achieved higher conversion to isomers, also proved that the conversion to isomer was more for n-heptane than n-hexane, which achieved 73.05 mol% conversion of n-heptane, while 57.91% for n-hexane at the optimum operation conditions.