G. Valavarasu and B. Sairam, “Light naphtha isomerization process: A review,” Pet. Sci. Technol., vol. 31, no. 6, 2013, pp. 551–562.
 J. Stolark, “A brief history of octane in gasoline : From lead to ethanol,” Environ. Energy Study Inst., vol. 707, 2016, pp. 1–6.
 H. Weyda, E. Köhler, “Modern refining concepts - An update on naphtha-isomerization to modern gasoline manufacture,” Stud. Surf. Sci. Catal., vol. 145, 2002, pp. 61–66.
 A. Aitani, M. N. Akhtar, S. Al-Khattaf, Y. Jin, O. Koseoglo, and M. T. Klein, “Catalytic upgrading of light naphtha to gasoline blending components: A mini review,” Energy and Fuels, vol. 33, no. 5, 2019, pp. 3828–3843.
 S. R. Naqvi, A. Bibi, M. Naqvi, T. Noor, A.S. Nizami, M. Rehan, M.Ayoub., “New trends in improving gasoline quality and octane through naphtha isomerization: a short review,” Appl. Petrochemical Res., vol. 8, no. 3, 2018, pp. 131–139.
 L. I. Ali, A. G. A. Ali, S. M. Aboul-Fotouh, and A. K. Aboul-Gheit, “Hydroconversion of n-paraffins in light naphtha using Pt/Al2O3 catalysts promoted with noble metals and/or chlorine,” Appl. Catal. A Gen., vol. 205, no. 1–2, 2001, pp. 129–146.
 M. Jahangiri, F. Salehirad, and S. Alijani, “Preparation of Pt/Al2O3-Cl catalyst and investigation of operating variables effects on isomerization reaction,” J. Chem. Pet. Eng., vol. 52, 2018, pp. 13–21.
 R. H. Abudawood, “Hydroisomerization of alkanes over metal-loaded zeolite catalyst School of Chemical Engineering and Analytical Science,”, 2010, p. 30,38,50.
 B. Bayati, M. Ejtemaei, N. Charchi Aghdam, A. Akbar Babaluo, M. Haghighi, A. Sharafi, “Hydroisomerization of n-Pentane over Pt/Mordenite catalyst: Effect of feed composition and process conditions,” Iran. J. Oil & Gas Sci. Technol., vol. 5, no. 2, 2016, pp. 84–99.
 J. I. Villegas, N. Kumar, T. Heikkilä, V. P. Lehto, T. Salmi, and D. Y. Murzin, “Isomerization of n-butane to isobutane over Pt-modified Beta and ZSM-5 zeolite catalysts: Catalyst deactivation and regeneration,” Chem. Eng. J., vol. 120, no. 1–2, 2006, pp. 83–89.
 I. Eswaramoorthi and N. Lingappan, “Ni–Pt/H-Y zeolite catalysts for hydroisomerization of n -hexane and n -heptane,” vol. 87, 2003, pp. 133–142.
 F. V. Barsi and D. Cardoso, “Bimetallic Pt-Ni catalysts supported on usy zeolite for n-hexane isomerization,” Brazilian J. Chem. Eng., vol. 26, no. 2, 2009, pp. 353–360.
 I. Nakamura, A. Zhang, K. Fujimoto, and K. Aimoto, “Hydroisomerization of n-pentane over hybrid catalyst composed of precious metals and zeolite —A design concept for hybrid catalyst,” J. Japan Pet. Inst., vol. 38, no. 6, 1995, pp. 407–412.
 J. Luis and B. Ramos, “Los medios tradicionales de enseñanza,” vol. 229, no. 0180, 2003, p. 24.
 B. K. Modhera, M. Chakraborty, P. A. Parikh, and R. V. Jasra, “N-hexane hydroisomerization over nano-crystalline zeolite beta,” Pet. Sci. Technol., vol. 27, no. 11, 2009, pp. 1196–1208.
 Hauli L, Wijaya K, Armunanto R. “Preparation and characterization of sulfated zirconia from a commercial zirconia nanopowder,” Orient. J. Chem., vol. 34, 2018, pp. 1559-1564.
 A. K. Aboul-Gheit, D. S. El-Desouki, S. M. Abdel-Hamid, S. A. Ghoneim, A. H. Ibrahim, and F. K. Gad, “Sulfated zirconia catalysts for low temperature isomerization of n-pentane,” Egypt. J. Chem., vol. 55, no. 5, 2012, pp. 509–527.
 “Thomas Løften Catalytic isomerization of light alkanes,” PhD. Thesis, 2004.
 T. Kimura, “Development of Pt/SO42- /ZrO2 catalyst for isomerization of light naphtha,” Catal. Today, vol. 81, no. 1, 2003, pp. 57–63.
 O. B. Belskaya et al., “Investigation of active metal species formation in Pd-promoted sulfated zirconia isomerization catalyst,” Appl. Catal. A Gen., vol. 387, no. 1–2, 2010, pp. 5–12.
 J. C. Yori and J. M. Parera, “Isomerization of n-butane over Ni SO42--ZrO2” Appl. Catal. A, Gen., vol. 129, no. 1, 1995, pp. 83–91.
 M. Hino and K. Arata, “Preparation of superacid of ruthenium-sulfated zirconia for reaction of butane to isobutane,” React. Kinet. Catal. Lett., vol. 66, no. 2, 1999, pp. 331–336.
 K. Watanabe, T. Kawakami, K. Baba, N. Oshio, and T. Kimura, “Effect of metals on the catalytic activity of sulfated zirconia for light naphtha isomerization,” Catal. Surv. from Asia, vol. 9, no. 1, 2005, pp. 17–24.
 A.K.Aboul-Gheit, F.K.Gad, G.M. Abdel-Aleem, D.S. El-Desouki, S.M. Abdel-Hamid, S.A. Ghoneim, A.H.Ibrahim, “Pt, Re and Pt–Re incorporation in sulfated zirconia as catalysts for n-pentane isomerization,” Egypt. J. Pet., vol. 23, no. 3, 2014, pp. 303–314.
 K. Yang, H. Li, S. Zhao, S. Lai, W. Lai, Y. Lian, W. Fang, “Improvement of activity and stability of CuGa promoted sulfated zirconia catalyst for n-butane isomerization,” Ind. Eng. Chem. Res., vol. 57, no. 11, 2018, pp. 3855–3865.
 M. Ejtemaei, N. Charchi Aghdam, A. A. Babaluo, A. Tavakoli, and B. Bayati, “N-pentane isomerization over Pt-Al promoted sulfated zirconia nanocatalyst,” Sci. Iran., vol. 24, no. 3, 2017, pp. 1264–1271.
 C. C. Hwang and C. Y. Mou, “Comparison of the promotion effects on sulfated mesoporous zirconia catalysts achieved by alumina and gallium,” Appl. Catal. A Gen., vol. 365, no. 2, 2009, pp. 173–179.
 D. J. McIntosh, R. A. Kydd, and J. M. Hill, “Comparison of Cr, Mn, Fe, Co, and Ni as promoters for n-butane conversion over sulfated zirconia,” Chem. Eng. Commun., vol. 191, no. 1, 2004, pp. 137–149.
 E. A. García, E. H. Rueda, and A. J. Rouco, “Sulfated zirconia catalysts promoted with Fe and Mn: Mn effect in the Fe dispersion,” Appl. Catal. A Gen., vol. 210, no. 1–2, 2001, pp. 363–370.
 A. V. Ivanov, E. G. Khelkovskaya-Sergeeva, T. V. Vasina, O. V. Masloboishchikova, L. M. Kustov, and P. Zeuthen, “Isomerization of n-butane on the SO42--ZrO2 catalyst promoted by IV period metals,” Russ. Chem. Bull., vol. 48, no. 7, 1999, pp. 1266–1269.
 C. Miao, W. Hua, J. Chen, and Z. Gao, “Studies on SO42- promoted mixed oxide superacids,” Catal. Letters, vol. 37, no. 3–4, 1996, pp. 187–191.
 P. Wang, J. Zhang, C. Han, C. Yang, and C. Li, “Effect of modification methods on the surface properties and n-butane isomerization performance of La/Ni-promoted SO42--ZrO2 -Al2O3,” Appl. Surf. Sci., vol. 378, 2016, pp. 489–495.
 F.E. Lugo del Ángel, R. Silva-Rodrigo, A. Vázquez Rodríguez, R. García Alamilla, J. Navarrete Bolaños, A. Castillo Mares, José Aarón Melo-Banda, Eduardo Térres-Rojas, J.L. Rivera Armenta, “Studies on the catalytic activity of sulfated zirconia promoted with cerium oxide,” Adv. Mater. Res., vol. 132, 2010, pp. 149–161.