Abstract

The formation of coke on active sites in the entire volume of zeolite Y crystals has been experimentally confirmed. However, complete deactivation in the case of decationated zeolites is due to the blocking of zeolite space by coke deposition on the outer surface of the crystals. In this case, blocking occurs long before complete poisoning of the active sites in the bulk and filling the large cavities of zeolite Y with the coke. The model of the “inner” deactivation of zeolites Y is applicable only to dealuminated zeolites with a silica ratio equal to or greater than 70–75 or in the case of selective dealumination of the outer surface of the zeolite crystals.

中文翻译：

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Y型沸石上焦炭的形成及其失活模型

摘要

实验证实了在整个沸石Y晶体的活性部位上形成焦炭。然而，在去离子沸石的情况下，完全失活是由于通过在晶体外表面上沉积焦炭而阻塞了沸石空间。在这种情况下，在块中的活性部位完全中毒并用焦炭填充大的沸石Y腔之前很久就发生了堵塞。沸石“内部”失活的模型仅适用于二氧化硅比等于或大于70-75的脱铝沸石，或在沸石晶体外表面选择性脱铝的情况下。