n-Hexane isomerization on Ni-Pt catalysts/supported on HUSY zeolite: The influence from a metal content

• Published in: Catalysis today Vol. 107; pp. 693 - 698
• Main Authors: Yoshioka, Carlos M.N., Garetto, Teresita, Cardoso, Dilson
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30.10.2005; Elsevier Science
• Subjects: Bi-metallic catalyst; Catalysis; Chemistry; Exact sciences and technology; General and physical chemistry; Ion-exchange; Isomerization; n-Hexane; Ni-Pt; Octane; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolites: preparations and properties; Octane; Bi-metallic catalyst; n-Hexane; Ni-Pt; Isomerization; Mixed catalyst; Heterogeneous catalysis; Hexane; Zeolite; Supported catalyst; Molecular sieve; Catalyst support
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2005.07.056

Bi-functional catalysts were prepared to contain Ni, Pt or both, supported on a HUSY zeolite, with the following metal contents: catalysts 30, 130 and 180 × 10 −6 atg metal/g catalyst. These catalysts resulted from a competitive ion exchange with the use of aqueous solutions from [Ni(NH 3) 6]Cl 2 and [Pt(NH 3) 4]Cl 2 complexes. The catalysts were provided with a scheduled temperature reduction (TPR) and subjected to a catalytic assessment on the n-hexane isomerization at 250 °C and 1 atm. TPR results showed larger reducibility of Ni +2 cations in the presence of Pt. Bi-metallic Ni-Pt catalysts showed to have smaller deactivation and much higher activity compared to monometallic Ni catalysts. The selectivity for the production of di-ramified alkanes increases as the Ni content increases.