The Effect of TCE Addition on the Performance of Catalytic Isomerization of n-Hexane
DOI:
https://doi.org/10.31699/IJCPE.2008.4.2Abstract
n-Hexane conversion enhancement was studied by adding TCE (Trichloro-ethylene) on feed stream using 0.3%Pt/HY zeolite catalyst. All experiments were achieved at atmospheric pressure and on a continuous laboratory unit with a fixed bed reactor at a temperature range 240-270◦C, LHSV 1-3h-1, H2/nC6 mole ratio 1-4.
By adding 435 ppm of TCE, 49.5 mole% conversion was achieved at LHSV 1h-1, temperature of 270ºC and H2/nC6 mole ratio of 4, while the conversion was 18.3 mol% on the same catalyst without adding TCE at the same conditions. The activation energy decreased from 98.18 for pure Pt/HY zeolite to 82.83 kJ/mole by adding TCE. Beside enhancement the activity, selectivity and product distribution enhanced by providing DMB (Dimethyl butane) which have higher octane number as compared with 0.3%Pt/HY zeolite. Indeed the increase of the 2.2-DMB/2,3DMB ratio with n-hexane conversion is more pronounced with TCE than with pure Pt/HY zeolite.
References
Gauw F.J.M., Grandell J., Santen R.A., 2002,"The intrinsic kinetics of n-hexane isomerization catalyzed by Pt loaded solid acid catalyst", J. Catal. 206, 295-304.
Hilfman Lee, 1979, "Hydroprocessing of Hydrocarbons over Nickel, Molybdenum, and Platinum catalyst", US patent, 4175033.
Bokhoven J.A., Tramp M., Koningsbarger J.T., Miller and Pieters J.A.Z., Lercher J.A., Williams,Kung, 2001,"An explanation for enhanced activity for light alkane conversion in mildy steam dealuminated mordenite", J. Catal. 202, 129-140 .
Rabo J.A. and Gajda, 1989, "Development of kinetic model of reforming reaction on zeolite", J. Catal. Kev. Sci. Eng., 31, 385
Lawrence Tucker Kass, 1998 "Isomerization process with improved chloride recovery", United States Patent 5705730.
Fan Van Lin, Edger D., Davids, 2000, "Isomerization of n-hexane", US patent, 6140547.
Nattaparn, Lohitharn and James G. Goodwin, 2007,"n-Butane isomerization on SZ", J. Catal. 245 198-204.
Murray Brendan, 1997, "Isomerizing linear olefins to iso-olefins", US patent, 5648584.
Ribeiro F., Marcilly C., and Guisnet, 1982,"Hydromerization of n-hexane on Pt zeolite", J. Catal. 78, 267- 274.
Maha Al-hassani 2007,"Kinetic Study of n-Hexane Isomerization", M.Sc. Thesis, Baghdad University.
Vu T.N., Gastel J.V., Gilson J.P., Collet G., Dath J.P., and Duchet, J.C., 2005, "Platinum tungstated Zirconia isomerization catalysis part II effect of Pt on the mechanism of isomerization of n-hexane" J. Catal. 231, 468-479.
Exner H., Nagy E., Fetting F., Gubicza L., 1989,"Kinetic of hydroisomerization of n-alkane on nickel zeolite", Proc. of 5th conference of Applied Chemistry Unit Operation Process, vol.2, 420-425.
Fujula F., Lembert M., Figueras F., 1989, "Studies in surface science and catalyst", Vol. 62, pp.150.
Jan-Ku, Chen, A.M. Martin, Young Gull Kim and Vijay T. John, 1988, "Mechanical study of isomerization of n hexane", Ind. Eng. 27, 401-409.
Allain P., Nagnoux Schulz Ph., Guisnet M., 1997, "Hydroisomerization of n-hexane over platinum mazzite and platinum mordenite catalyst kinetic and mechanism", Appl. Catal. A: General 52, 227.
Nagy E., Felling F. and Halsig, G.P.,1984, "An assay of mass transport and kinetics of isomerization of n-hexane", Acta chemical Hungarica, 115, 4, 383-395 .
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