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Abstract. Platinum containing sulfated zirconia (Pt-SZ/Al) catalyst was prepared by precipitation method. Characterization of the prepared catalyst was performed using XRD and SEM, and catalytic activity was studied for isomerization of nC 5 at atmospheric conditions and temperatures of 180-240 C in a ow reactor. The e ects of reaction temperature, H 2 /nC 5 ratio, and WHSV were investigated. As revealed by SEM and XRD, the prepared sulfated zirconia was of nanoscale size and had predominantly tetragonal crystalline phase. n-pentane conversion increased with increasing temperature and selectivity decreased. The optimal reaction temperature was 220 C where n-pentane conversion and isopentane selectivity were 70% and 94%, respectively. The positive e ect of H 2 /nC 5 ratio was observed on nC 5 conversion and iC 5 selectivity in the investigated H 2 /nC 5 ratio range. This trend of variation was related to the role of acid and metallic sites on the reaction pathway. As expected, increase in the WHSV, which reduces contact time between reactant and catalyst, decreased nC 5 conversion and increased selectivity toward iC5. The RON of the product increased with increasing temperature; then, it showed slight decrease at higher temperature. The decrease in the activation energy was observed, which can be attributed to the di erent reaction mechanisms or di erent rate-determining steps.