Aging of Platinum Reforming Catalysts

External Catalyst Breakup Phenomena

“…This same mechanism has been shown to be operable in the loss of activity of alumina supported platinum catalyst, used in reforming r(actions in the petroleum industry (41).…”

Regeneration of Coked Particles

“…This has been shown in the work of Riley et α/. Hence if we write a surface site balance for an "initial" state of the catalyst: (9)(10)(11)(12)(13)(14)(15) Now in order to be in accord with the experimental observation of first-order kinetics with respect to [MCH], for PHl>0 the three adsorption terms in the denominator must be small with respect to unity, so Eq. They have shown that ESR determination of the carbon radical density, essentially unpaired aromatic π electrons embedded in the coke, indicates a substantial decrease with time on stream in heavy crude hydrodesulfurization on Co-Mo catalysts.…”

Coking and activity of porous catalysts in supercritical reaction media

“…Coke compounds formed from olefinic precursors are often polynuclear aromatic hydrocarbons (Myers et al, 1961;Appleby et al, 1962). In this work, naphthalene was chosen as the representative coke compound.…”