Effect of combining palladium, iridium or rhenium with platinum supported on H-ZSM-5 zeolite on their cyclohexene hydroconversion activities

Effect of hydrochlorination and hydrofluorination of H-ZSM-5 on the catalytic hydroconversion reactions of cyclohexene

“…Verification of this assumption has been realized via hydrochlorination and hydrofluorination of H-ZSM-5, which enhanced CHE hydrogenation reactions at relatively higher temperatures compared to those applied using specific bifunctional noble metals loaded H-ZSM-6 catalysts [17,18]. At low temperatures, the activities of the current catalysts for almost all hydroconversion reactions are in the order: H-ZSM-5(HCl) > H-ZSM-5(HF) > H-ZSM-5, by virtue of the higher acid sites number, whereas, at high temperatures, the activities are in the order: H-ZSM-5 > H-ZSM-5(HCl) > H-ZSM-5(HF), due to diffusion resistance in the zeolitic channels caused by deposited halo-aluminium debris.…”

“…12). The hydrogenation reactions take place on the current unloaded catalysts at relatively higher temperatures, compared to those carried out using active metals loaded H-ZSM-5 catalysts [17,18].…”

Hydroconversion of 1-methylnaphthalene over Pt/AlSBA-15–Al2O3 composite catalysts

“…[5,[68][69][70] have also found thatduring cyclohexeneconversionthe hydrogenation reaction took place not only on metal sites but also on unloaded zeolite. They have demonstrated that metal sites of mono-(Pt, Pd, Ir or Re) [68,69] and bi-metallic (Pt combined with Pd, Ir or Re) [5] catalysts supported on HZSM-5 are very active at low temperatures, i.e. 50-150°C, while The results given in Table 7 show thatthe activity of 1.5Pt/AlSBA-15Al 2 O 3 is much Table 8.…”

“…Since that time, the application of Pt catalysts has been continuously expanding to become a rapidly developing and commercially important field nowadays. From a commercial viewpoint, supported Pt catalysts are extremely important for reforming, hydrogenation, dehydrogenation, isomerisation, hydrocracking and oxidation as well as for automotive exhaust catalysts and fuel cells [4][5][6][7][8][9][10].…”

Hydrohalogenation of Platinum–Palladium/H-ZSM-5 Catalysts for n-Hexane Hydroconversion

“…Metallic function can be improved by adding a second metal combined with Pt, where a commercial success can be more actively realized. Palladium is a strongly active noble metal for decreasing the coke deposition reactions in naphtha and acting as active promoter for Pt by virtue of its higher hydrogenation and dehydrogenation activities compared to Pt (Aboul-Fotouh and Aboul-Gheit, 2001;Aboul-Gheit et al, 2005a, 2005b.…”