N-Hexane Isomerization on Ni-Pt/Catalysts Supported on Mordenite

Abstract

The aim of this work was to evaluate the catalytic properties for n-hexane isomerization of bifunctional monometallic (Ni or Pt) and bimetallic catalysts (Pt-Ni), using HMOR zeolite as support. The method used for metal dispersion in the zeolite was competitive ion exchange using ammine complexes [Ni(NH 3) 6 ]Cl 2 and [Pt(NH 3) 4 ]Cl 2 as precursors. The catalysts were characterized by X-Ray diffraction, X-Ray energy dispersion spectroscopy, temperature-programmed reduction and transmission electron microscopy. The n-hexane isomerization reaction using the catalysts was carried out to evaluate the catalyst activity. The reaction was carried out in a fixed bed reactor operating at 250˚C, 1 atm, H 2 /C 6 = 9 molar ratio. The profiles obtained from TPR suggest that, for bimetallic catalysts, the presence of platinum facilitates the reduction of Ni 2+ cations. The bimetallic catalysts presented a higher activity in the isomerization of n-hexane when compared to the monometallic ones, as well better stability as the Pt content in the solid increases.

Catalytic Activity of Pt Loaded Zeolites for Hydroisomerization of n-Hexane Using Supercritical CO2

“…Similarly, Nasser et al revealed that dealumination of MOR zeolite with 1 M nitric acid for 20 min of treatment gave only 20% catalytic conversion of n -hexane that is reduced to 17.3% after 240 min of treatment mainly due to pore blockage by reduction of mesopore channels or coke. Martins and his research group demonstrated that the 40Ni60Pt/H-MOR catalyst showed the maximum n -hexane conversion of about 24%, while 60Ni40Pt/H-MOR revealed 99% selectivity at 250 °C . It is concluded that a temperature of 300 °C is an optimum temperature to obtain about 90–94% isomerization selectivity with about 77% conversion of n -hexane by all Ba and Sr modified Pt-zeolites.…”

Effect of Modifying the Clinoptilolite-Containing Rocks of Transcarpathia on Their Porous Characteristics and Catalytic Properties in the Conversion of C6-Hydrocarbons

“…According to the literature, [7][8][9] one of the most effective catalysts for the isomerization of linear hexane, an industrially important reaction used to increase the octane number of the pentane-hexane fraction of oil, is mordenite. The prospect of using natural zeolites of Transcarpathia with predominantly mordenite components for these purposes was investigated.…”

Catalytic Upgrading of Light Naphtha to Gasoline Blending Components: A Mini Review

“…Bimetallic (Ni−Pt)/MOR and monometallic (Pt or Ni) catalysts and were evaluated in a fixed-bed reactor at 0.1 MPa, 250 °C, and H 2 /n-hexane molar ratio of 9. 45 The temperatureprogrammed reduction (TPR) profiles suggested that the presence of Pt contributed to the reduction of Ni 2+ cations in bimetallic catalysts. The bimetallic catalysts showed better activity for isomerization of n-hexane and improved stability upon increasing their Pt content.…”