Trends in processing C4-C7 paraffinic hydrocarbons

Transformation of n-hexane on Al2O3and SiO2supported Pt, Pt+Ga and Ir+Pt+Ga catalysts prepared by anchoring methods

“…the dispersion of Pt decreased. This decrease of Pt dispersion can probably be attributed to the higher metal loading and/or the formation of PtGa 2 intermetallic compound and thus electronic interaction between the two metals [14]. As far as iridium is also able to chemisorb H 2 [34], the addition of iridium increases the hydrogen uptake of tri-metallic catalysts compared to bimetallic ones.…”

“…For instance, the elucidation of the state and the effect of gallium in naphtha reforming or dehydrogenation catalysts require further investigation. The addition of gallium was shown to change both hydrogen chemisorption and catalytic properties of Pt/SiO 2 [14] and Pt/Al 2 O 3 [15][16][17] catalysts. Gallium increased the dispersion and decreased the activity of platinum in the dehydrogenation of cyclohexane due to the formation of PtGa 2 alloy [14].…”

“…The addition of gallium was shown to change both hydrogen chemisorption and catalytic properties of Pt/SiO 2 [14] and Pt/Al 2 O 3 [15][16][17] catalysts. Gallium increased the dispersion and decreased the activity of platinum in the dehydrogenation of cyclohexane due to the formation of PtGa 2 alloy [14]. The presence of 0.25 wt.% Ga in 0.25 wt.% Pt/Al 2 O 3 catalyst resulted in an enhanced hydrogenolysis, isomerization and aromatization selectivity in nhexane conversion [15].…”