Parmar, Deependra, Mallette, Adam J., Linares, Noemi, Saslow, Sarah A., Terlier, Tanguy, Strohm, James J., Barber, Lee P., Dai, Heng, Garcia-Martinez, Javier, Rimer, Jeffrey D.
Direct Synthesis of Highly Siliceous ZnO-FAU Zeolite with Enhanced Performance in Hydrocarbon Cracking Reactions
ACS Materials Letters. 2023, 5: 202-208. https://doi.org/10.1021/acsmaterialslett.2c00978
URI: http://hdl.handle.net/10045/130458
DOI: 10.1021/acsmaterialslett.2c00978
ISSN: 2639-4979
Abstract: 
The hydrothermal stability and catalytic activity of zeolite Y (faujasite, FAU) is highly dependent on its composition. High silicon content is often desirable for catalytic applications; however, direct synthesis of faujasite with high silicon content (Si/Al > 2.5) is nontrivial. Here, we present an organic-free synthesis of FAU-type zeolite with Si/Al = 3.4 using zinc oxide as a modifier. A combination of spectroscopy and microscopy techniques confirms that ZnO is well-distributed within zeolite pores as extra-framework species, and the nature of these species differs from bulk ZnO and framework zinc in Zn-FAU crystals. We demonstrate that the increased Si/Al ratio leads to improved hydrothermal stability, while catalytic cracking of 1-hexene and cumene show that ZnO-FAU exhibits a significantly longer lifetime compared to in-house and commercial zeolite Y. Collectively, this study presents a facile and efficient method to prepare more siliceous FAU with enhanced catalytic performance.
Keywords:Zeolite, Catalyst, Hydrothermal stability, Faujasite, Zinc oxide
American Chemical Society
info:eu-repo/semantics/article