The influence of second metal component (Fc) on Pt/KL zeolie catalyst was investi-gated. The catalytic properties of Pt-Fe/KL zeolite varied as the amount of Fe. When the amount of Fe was 0.3 % (mass fraction), the ca...The influence of second metal component (Fc) on Pt/KL zeolie catalyst was investi-gated. The catalytic properties of Pt-Fe/KL zeolite varied as the amount of Fe. When the amount of Fe was 0.3 % (mass fraction), the catalyst was found to show both excellent n-hexane aromati-zation reactivity and higher ability for sulphur-resistance. The dispersion of Pt particles was also found to be better in this bimetallic catalyst, whereas the electron state of Pt particles as indicated by CO-FTIR was nlodified to be more electron-deficient than that of Pt/KL zeolite, which made the bimetallic Pt-Fe/KL more tolerant to sulphur poisoning.展开更多
Xe-129-NMR and TEM were used to study the location and dispersion of Pt particles in KL zeolite with lanthanum incorporation. Owing to the interaction between Pt and La, more Pt particles accompanying La3+ were locate...Xe-129-NMR and TEM were used to study the location and dispersion of Pt particles in KL zeolite with lanthanum incorporation. Owing to the interaction between Pt and La, more Pt particles accompanying La3+ were located in the inner channels of KL zeolite, rather than agglomerated in the external surface. The dispersion of Pt particles was therefore improved. Pt/KL zeolite modified by La showed a little lower reactivity for aromatization of n-hexane, but much higher resistance to sulfur-poisoning because of the existence of new acidic sites.展开更多
文摘The influence of second metal component (Fc) on Pt/KL zeolie catalyst was investi-gated. The catalytic properties of Pt-Fe/KL zeolite varied as the amount of Fe. When the amount of Fe was 0.3 % (mass fraction), the catalyst was found to show both excellent n-hexane aromati-zation reactivity and higher ability for sulphur-resistance. The dispersion of Pt particles was also found to be better in this bimetallic catalyst, whereas the electron state of Pt particles as indicated by CO-FTIR was nlodified to be more electron-deficient than that of Pt/KL zeolite, which made the bimetallic Pt-Fe/KL more tolerant to sulphur poisoning.
文摘Xe-129-NMR and TEM were used to study the location and dispersion of Pt particles in KL zeolite with lanthanum incorporation. Owing to the interaction between Pt and La, more Pt particles accompanying La3+ were located in the inner channels of KL zeolite, rather than agglomerated in the external surface. The dispersion of Pt particles was therefore improved. Pt/KL zeolite modified by La showed a little lower reactivity for aromatization of n-hexane, but much higher resistance to sulfur-poisoning because of the existence of new acidic sites.
