Abstract: A process for converting paraffin by using a modified zirconia catalyst is provided. The process has steps of: (i) providing feed containing n-pentane, n-hexane and more than 2 vol % n-heptane based on the volume of the feed; and (ii) subjecting the feed to isomerization of n-heptane with a modified zirconia catalyst comprising zirconium oxide, sulfate ions, a first metal component and a second metal component. Based on the weight of the catalyst, an amount of the first metal component ranges between 0.1 wt % and 15 wt %, an amount of the second metal component ranges between 0.2 wt % and 3.0 wt %, and an amount of the sulfate ions contain sulfur is less than 1.0 wt %. By using the modified zirconia catalyst with low sulfate content, the process is beneficial to improve iso-C7 selectivity and conversion rate in heptane isomerization.

Abstract: The present invention provides a modified zirconia catalyst including zirconia, sulfate anion, a first metal component and a second metal component, wherein the first metal component can contain aluminum or gallium, and the second metal component includes platinum or palladinum. The weight percentage of sulfur atoms of the sulfate anion based on the weight of the modified zirconia catalyst is less than 1.0 wt %. Decreasing the sulfate content of the modified zirconia catalyst during impregnation can remarkably enhance the iso-C7 selectivity and adding alumina into the modified zirconia catalyst can maintain the catalytic activity thereof. The present invention also provides a manufacturing method of the modified zirconia catalyst described above.