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Received March 18, 2002
Accepted September 17, 2002
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Nickel Impregnated Pt/H-β and Pt/H-Mordenite Catalysts for Hydroisomerization of n-Hexane
Department of Chemistry, College of Engineering, Anna University, Chennai-600 025, India 1Science and Humanities Division, Madras Institute of Technology, Anna University, Chrompet, Chennai-600 044, India
eswarchem@hotmail.com
Korean Journal of Chemical Engineering, March 2003, 20(2), 207-216(10), 10.1007/BF02697230
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Abstract
Nickel impregnated Pt/H-β and Pt/H-MOR catalysts with different Ni content were prepared and subjected to hydroisomerization of n-hexane in the presence of flowing H2 gas. The states of Pt and Ni were identified by ESCA. The particle size measured by TEM shows that average particle size increases with increasing Ni loading. The acidity of the catalysts was measured by TPD of ammonia. The catalytic activity of Ni containing and Ni free Pt/H-β and Pt/H-MOR catalysts was compared and found that addition of Ni up to a threshold value (0.3 wt% for β and 0.1 wt% for_x000D_
MOR) increases the n-hexane conversion and dimethyl butanes selectivity due to better metal-acid synergism and decreases the amount of cracked products. When the Ni amount exceeds the threshold values the conversion decreases and cracked products increase. Further the Ni impregnation of Pt containing acidic supports increases the sustainability of the catalysts and was found to favor the protonated cyclopropane (PCP) intermediate mechanism in n-hexane_x000D_
isomerization. β zeolite was found to be a better potential support than mordenite and the isomerized product mixture shows better octane number.
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Condon FE, Catalysis, 1, 6 (1958)
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Glannetto GE, Perot GE, Guisnet MR, Ind. Eng. Chem. Prod. Res. Dev., 25, 481 (1986)
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Narayanan S, Zeolites, 4(3), 231 (1984)
Sinha AK, Sivasanker S, Catal. Today, 49(1-3), 293 (1999)
Tiong Sie S, Ind. Eng. Chem. Res., 31, 1881 (1992)
Weisz PB, Prater CD, Adv. Catal., 6, 413 (1954)
