CATALYTIC REFORMING OF n-HEPTANE ON PLATINUM-TUNGSTEN SUPPORTED ON GAMMA-ALUMINA

Subject Areas : Journal of Physical & Theoretical Chemistry

M. Vadi ¹ , A. Safavi ² , A. Jamshidi ³

1 - -
2 - -
3 - -

Received: 2015-04-25 Accepted : 2015-04-25 Published : 2007-04-01

Keywords: Catalytic reforming, n-heptane, Platinum, Tungsten, Gamma-alumina,

Abstract :

The mono-metallic and bi-metallic catalysts have been prepared by impregnating with solutions containing a compound of H2PtCl6,WO3 and 1ml HCl (0.1 mol). It should be noted that the catalysts’ activity and selectivity have been determined under these conditions : 450-5000C ,and 15-25atm by H2. For converting n-heptane , the molar ratio H2/C7H16 is 5 , and LHSV is 1.5ml/h. It has been proved that , under these experimental conditions , the conversion of n-heptane into branched aliphatic isomers is catalyzed by a bifunctional mechanism. The results indicate that in the presence of W , the catalysts have much higher selectivity and stability for isomerization reaction. At a given conversion , the bi-metallic catalysts produce much lower concentrations of cracked products. According to the tests , W modifies the support acidity resulting to the higher selectivity for isomerization and the lower one for cracking , and it also modifies the Pt properties