Enhancement of Iraqi Light Naphtha Octane Number Using Pt Supported HMOR Zeolite Catalyst
The hydroconversion of Iraqi light straight run naphtha was studied on zeolite catalyst. 0.3wt.%Pt/HMOR catalyst was prepared locally and used in the present work. The hydroconversion performed on a continuous fixed-bed laboratory reaction unit. Experiments were performed in the temperature range of 200 to 350°C, pressure range of 3 to 15 bars, LHSV range of 0.5-2.5h-1, and the hydrogen to naphtha ratio of 300.
The results show that the hydroconversion of Iraqi light straight naphtha increases with increase in reaction temperature and decreases with increase in LHSV.
High octane number isomers were formed at low temperature of 240°C. The selectivity of hydroisomerization improved by increasing reaction pressure up to 15 bars. Catalyst activity almost stable and independent of time on stream at 15 bar up to 20 h.
Aboul-Gheit A. K., Ghoneim S. A., and Al-Owais, (1998), “Effect of hydrothermal treatment and ammonium ion incorporation in platinum-mordenite catalysis for n-hexane hydroconversion”, Applied Catalysis A: general, 170, p.p. 277-283.
Alexander R., Anja W., and Wladimir R. (2013), “A study on the bifunctional isomerization of n-decane using a superior combination of design of experiments and kinetic modeling”, Chemical Engineering Science, 87, p.p. 160-172.
Al-Hassani M. H., (2007), “Kinetic study of catalytic hexane isomerization”, Master Thesis, University of Baghdad, College of Engineering,
Allian J.F., Magnoux P., Schulz P. and Guisnet M., (1997), “Hydroisomerization of n-hexane over platinum mazzite and platinum mordenite catalysts kinetics and mechanism”, Applied catalysis A: General, 152, p.p. 221-235.
Burckle, E. C. (2000), “Comparison of One-, Two-, and Three- Dimensional Zeolites for the Alkylation of Isobutane with 2-Butene”, Masters Thesis, University of Cincinnati, Cincinnati, Ohio.
Busto M., Dosso L.A., Vera C.R. and Grau J. M., (2012), “Composite catalysts of and for producing high octane isomerizate by isomerization- cracking of long paraffins”, Fuel Processing Technology”, 104, p.p. 128-135.
Chao K. J., Wu H.C., and Leu L.J., (1996), “hydroisomerization of light normal paraffins over series of platinum-loaded mordenite and beta catalysts”, Applied catalysis A: General 143, p.p. 223-243.
Chao K.J., Lin C.C., Lin C.H., Wu H.C., Tseng C.W., and Chen S.H., (2000), “n-Heptane hydroconversion on platinum-loaded mordenite and beta zeolites: the effect of reaction pressure”, Applied Catalysis A: general, 203, p.p. 211-220.
Chiang H. and Bhan A., (2011), “Catalytic consequences of hydroxyl group location on the kinetics of n-hexane hydroisomerization over acidic zeolites”, Journal of Catalysis, 283, p.p. 98-107.
Gauw F. J. M., Grandell J., Santen R. A., (2002), “The intrinsic kinetics of n-hexane isomerization catalyzed by Pt loaded solid acid catalyst”, Journal of Catalysis, 206, p.p. 295-304.
Grillo M.E. and Agudelo M. M. R., (1997), “Structure and initial interaction of butane isomers in a Pt/H-mordenite catalyst”, Journal of Molecular Catalysis A: Chemical, 119, p.p. 105-112.
Guisnet M., Fouch V., Belloum M., and Bournonvill J. P., (1991), “Mordenite catalyst 1 influence of the silicon to aluminum ratio”, Applied Catalysis, 71, p.p. 295-306.
Hollo A., Hancsok J., and Kallo D., (2002), “Kinetics of hydroisomerization of C5-C7 alkanes and their mixtures over platinum containing mordenite”, Applied Catalysis A: General, 229, p.p. 93-102.
Jiménez C. Romero F. J., Roldán R., Marinas J. M., and Gómez J. P., (2003), “Hydroisomerization of a hydrocarbon feed containing n-hexane, n-heptane and cyclohexane on zeolite-supported platinum catalysts”, Applied Catalysis A: General, 249, p.p. 175-185.
Lee J. K., and Rhee H. K., (1997), “Characteristics of Pt/H-beta and Pt/H-mordenite catalyst for the isomerization of n-hexane”, Catalysis Today, 38, p.p. 235-242.
Liu P., Wang J., Zhang X., Wei R., and Ren X., (2009), “Catalytic performances of dealuminated Hβ zeolite supported Pt catalysts doped with Cr in hydroisomerization of n-heptane”, Chemical Engineering Journal, article in press.
Liu P., Yao Y., Zhang X., and Wang J., (2011), “Rate earth metals ion- exchanged β-zeolites as supports of platinum catalysts for hydroisomerization of n-heptane”, Catalysis kinetics and reactors, 19, 2, p.p. 278-284.
Nikolaou, N; Papadopoulos, C. E; Gaglia, I. A. and Pitarakis, K. G. (2004). Fuel, 83, p.p. 517-523.
Patrylak K. I., Bobonych F. M., Voloshyna Y. G., Levchuk M. M., Il’in V. G., Yakovenko O. M., Maza I. A., and Tsupryk I. M., (1998), “Ukranian mordenite-clinoptilolite rocks as a base for linear hexane isomerization catalyst”, Applied catalysis A: General, 174, p.p. 187-198.
Raed h. a. w., (2010), “Hydroisomerization of alkanes over metal-loaded zeolite catalysts”, Ph.D. Thesis, University of Manchester, Faculty of Engineering and Physical Sciences.
Roldán R., Beale A. M., Sánchez M., Francisco J. R. S., César J. S., Gómez J. P., and Sankar G., (2008), “Effect of the impregnation order on the nature of metal particles of bi-functional Pt/Pd-supported zeolite Beta materials and on their catalytic activity for the hydroisomerization of alkanes”, Journal of Catalysis, 254, p.p. 12–26.
Sandeep K. S., Nagabhatla V., and Garg M.O. (2013), “Cracking and isomerization functionalities of bi-metallic zeolites for naphtha value upgrading”, Fuel, article in press.
Saxena S.K. Kamble R., Singh M., Garg M.O., and Viswanadham N., (2009), “Effect of acid treatments on physico-chemical properties and isomerization activity of mordenite”, Catalysis Today, 141, p.p. 215-219.
Sege R., (2003), “Catalytic processes in petroleum refining”, Mc-Graw Hill, New York.
Stanislav V. K., Irina I. I., Olga A. P., and Vladimir I. Z., (2012), “Hydroisomerization of n-alkanes over Pt-modified micro/mesoporous materials obtained by mordenite recrystallization”, Microporous and mesoporous Materials, 164, p.p. 222-231.
Theo L.M. M., Rajamani K., Jasper M. V., Berend S., Sofia C., Juan M. C. S., (2008), “Shape-selective n-alkane hydroconversion at exterior zeolite surfaces”, Journal of Catalysis, 256, p.p. 95–107.
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