Kinetics study and analysis of zeolite Y destruction

doi:10.1016/S1872-2067(15)60975-5

Abstract

Abstract:

A series of zeolites, including USY zeolites without sodium, Na-USY at different Na contents, La-USY with different rare earth (RE) contents and La-Na-USY with RE and Na were prepared by an ion exchange method. They were investigated to understand the activation barriers for the destruction of Y zeolite structure under hydrothermal treatment and the effect of V using the solid-state kinetic model. The results showed that the pathways for Y zeolite destruction were dealumination, desiliconization and the disappearance of La-O bonds. Zeolites were destroyed by steam through acid hydrolysis, which was accelerated by V. In addition, Na and V exerted a synergistic effect on the framework destruction, and the formation of NaOH was the rate-determining step. The presence of RE elements decreased hydrolysis and stabilized the structure of the zeolites. The interaction between V and RE destroyed zeolite structure by eliminating the stabilizing La-O [RE-OH-RE]⁵⁺ bridges in the sodalite cages.

Key words: Y zeolite, Vanadium, Sodium, Rare earth, Hydrothermal stability, Destruction, Apparent activation energy

Xiaohui Du, Xueli Li, Haitao Zhang, Xionghou Gao. Kinetics study and analysis of zeolite Y destruction[J]. Chinese Journal of Catalysis, 2016, 37(2): 316-323.

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