Cyclic propylene steaming method

Rajagopalan et al [30] confirm that methods involving cyclic redox aging of metals in the presence of sulphur are needed for screening metals tolerant catalyst. A simplified cyclic test (cyclic propylene steam) method is proposed which addresses the redox ageing of the metal, but not the non-uniform laydown and age distribution of metals on the catalyst. 

FCC catalyst, supplied by Grace Davison, at three different cat-to-oil ratios, 4,6, and 8. The feed was injected at a constant rate of 3 g/min for 30 seconds. The catalyst to oil ratio was adjusted by varying the amonnt of catalyst in the reactor. Two catalysts used for this evaluation were laboratory deactivated using the cyclic propylene steaming (CPS) method [6]. Properties of these catalysts after deactivation are listed in Table 12.3. 

Properties Mitchell Method Cyclic Metals Impregnation Cyclic Propylene Steam... 

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