Naphtha reforming Pt-Re-Ge/γ-Al2O3 catalysts prepared by catalytic reduction: Influence of the pH of the Ge addition step

✍ Scribed by Silvana A. D’Ippolito; Carlos R. Vera; Florence Epron; Catherine Especel; Patrice Marécot; Carlos L. Pieck

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 567 KB
• Volume: 133-135
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.11.014

✦ Synopsis

Pt-Re-Ge/gAl 2 O 3 catalysts were prepared by the catalytic reduction method using different impregnation media (H 2 O, HCl and NH 3 ) and different Ge contents (0.0, 0.1, 0.3, 1.0 and 2.0%). The influence of these preparation parameters on the activity for n-heptane conversion and the selectivity to toluene at atmospheric pressure was assessed. The catalysts were also characterized by ICP-AES, temperature programmed reduction, pyridine temperature programmed desorption and CO pulse chemisorption. The results show that as the pH is increased the Ge content increases and the catalysts present a lower hydrogenolytic activity and a lower toluene selectivity. Ge addition modifies both metal and acid functions. The catalyst with minimum Ge content prepared using water as impregnation medium has the best performance.