Some peculiarities of coke formation and burning on catalysts for reforming

Influence of Time and Temperature on the Regeneration of PtReIn/Al2O3 Naphtha Reforming Catalysts

“…The temperatures of these peaks depend on the amount of coke and its composition, and on the operating conditions of the TPO experiments (heating rate, oxygen concentration, gas flow-rate, etc.) [30,[32][33][34][35]. There is also an intermediate zone of coke combustion attributed to the existence of coke with intermediate degrees of polymerization and located in the vicinity of Pt particles [36].…”

Comparison of coke burning on catalysts coked in a commercial plant and in the laboratory

“…Both TPO's have two burning zones. According to several authors (Barbier et al, 1980; Figoli et al, 1982;Parera et al, 1983;Zharkov et al, 1986), the coke that burns at lower temperatures is the part of the coke deposited on the metallic function and is relatively rich in hydrogen. Meanwhile, the coke that burns at a higher temperature is the part of the coke deposited on the acidic function and is less hydrogenated.…”

n-decane dehydrogenation on bimetallic PtSn and PtGe catalysts prepared by dip-coating

“…This behavior could be related to a different toxicity and localization of carbon in the bimetallic samples with respect to the monometallic one. Figure 10 illus trates that the TPO profile for catalyst Pt/γ A/α A shows a signal at lower temperature than that corre sponding to the bimetallic catalysts and this could be attributed to a C deposition on the metallic phase [66][67][68]. PtSn and PtGe catalysts show that the TPO peak is shifted to higher temperatures, thus indicating a higher C deposition on the support [69][70][71].…”