Zeolite Y is one of the most important catalysts that are used in catalytic processes such as fluidic catalytic cracking (FCC). This zeolite can be degraded during the FCC process, particularly under high-temperature steaming conditions; however, the degradation mechanisms have not been fully elucidated yet and previous studies have mainly focused on dealumination behaviors. In this study, we performed high-temperature treatments under steaming conditions to prepare a series of degraded zeolite Y samples, which were carefully investigated through techniques such as argon adsorption, high-energy X-ray total scattering, and transmission electron microscopy. A non-linear correlation between the crystallinity and micropore volume was observed. We propose that the degradation mechanism involved the formation of a dense amorphous layer, which the argon molecules cannot infiltrate into, on the surface of the crystals during high-temperature steaming treatment.

沸石Y是用于催化过程（例如流化催化裂化（FCC））的最重要的催化剂之一。这种沸石在FCC过程中可能会降解，尤其是在高温蒸煮条件下。然而，降解机理尚未完全阐明，以前的研究主要集中在脱铝行为上。在这项研究中，我们在汽蒸条件下进行了高温处理，以制备一系列降解的Y沸石样品，并通过氩气吸附，高能X射线总散射和透射电子显微镜等技术对其进行了仔细研究。观察到结晶度和微孔体积之间的非线性相关性。我们认为降解机理涉及致密非晶层的形成，