ChemInform Abstract: Hydrothermal Stability and Vanadium Tolerance of ZSM-20 and Y Zeolites.
Abstract
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ChemInform Abstract
Thermal and hydrothermal stabilities as well as catalytic activity (in n-hexane transformation) and structural resistance to V poisoning of the acid forms of the zeolites ZSM-20, Y and its ultrastabilized form USY are investigated. Both the low thermal stability and initial cracking activity of HY are attributed to the lower Si/Al framework ratio relative to USHY and H-ZSM-20. The latter two exhibit similar hydrothermal stabilities. HY zeolite shows a lower resistance to low levels of V poisoning than H-ZSM-20. However, the V-induced crystallinity loss is higher for H-ZSM-20 than for USHY. Despite the higher structural resistance of the latter there is no difference to H- ZSM-20 concerning the reduction of the initial cracking activity by V for most severe treatment.
