Trimetallic naphtha reforming catalysts

Carvalho, Luciene Santos de; Pieck, C.L.; Rangel, M.C.; Fı́goli, N.S.; Vera, Carlos Román; Parera, J.M.

doi:10.1016/j.apcata.2004.04.006

Cited by 70 publications

(41 citation statements)

References 22 publications

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“…In this catalyst about 11 acid sites are neutralized for each atom of Ni added. Similar results have been recently reported by Carvalho et al [19], indicating that Sn addition to chlorided alumina neutralizes 10 acid sites per Sn atom. The multiple neutralization occurring upon addition of small amounts of promoter can be attributed to the simultaneous direct neutralization of very strong acid sites and the indirect neutralization of other weaker acid sites in the neighbourhood which had been formed by polarization of the lattice by the electrophillic anion (Cl ) , SO 4 2) ) associated to the strong acid site.…”

Section: Resultssupporting

confidence: 89%

Comparison between Ni and Pt promoted SO42??ZrO2 catalysts for n-octane hydroisomerization-cracking

et al. 2005

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The production of C 4 -C 6 branched isoalkanes by isomerization-cracking of n-octane (300°C, 0.1 MPa) using sulfated zirconia catalysts was studied. The effect of Ni addition on the activity and selectivity was compared to the effect of Pt. Pt enhanced the activity and stability of the catalysts. Ni mainly improved the selectivity to isoparaffins (maximum yield at 1% Ni). n-Octane conversion fully correlated with total acidity. Average and final stable conversion values were in comparison lower for Ni catalysts. This result was addressed to the lower metal activity of Ni and to the detrimental effect of sulfated zirconia on the reducibility of the metal.

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Section: Resultssupporting

confidence: 89%

Comparison between Ni and Pt promoted SO42??ZrO2 catalysts for n-octane hydroisomerization-cracking

et al. 2005

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“…Regarding the trimetallic catalysts, there is not much information in the open literature about their properties. There have been recently published studies about the effect of Re and Sn addition to Pt/Al 2 O 3 on its acid and metallic functions [12,13]. These studies showed that Re and Sn affect not only the metallic but also the acid function.…”

Section: Introductionmentioning

confidence: 97%

The Effect of the Addition of Re and Ge on the Properties of Pt/Al2O3

et al. 2005

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“…The catalytic properties of Pt can be improved by the addition of another metal, such as Re [2], Sn [3] or Ge [4]. These additives modify the activity, selectivity and stability of the catalyst [5,6]. The mechanisms of the main bifunctional reactions of naphtha reforming (paraffins isomerization and dehydrocyclization) are controlled by the acid function.…”

Section: Introductionmentioning

confidence: 99%