Abstract
Zeolites have been successfully employed in many catalytic reactions of industrial relevance. The severe conditions required in some processes, where high temperatures are frequently combined with the presence of steam, highlight the need of considering the evolution of the catalyst structure during the reaction. This review attempts to summarize the recently developed strategies to improve the hydrothermal framework stability of zeolites.
Highlights
More than 250 different zeolite framework types have been recognized by the International Zeolite Association (IZA).[1]
Zeolites are employed as catalysts in many different processes of industrial relevance, such as uid catalytic cracking (FCC), selective catalytic reduction (SCR), methanol to hydrocarbons (MTH) reaction, dehydration of alcohols, alkylation, hydroxylation, and epoxidation, among others.[3]
Hydrothermal stability is an important characteristic of zeolites, which makes them one of the most widely employed materials for automobile applications viz., exhaust puri cation, hydrocarbon trapping, diesel oxidation catalysis, SCR, etc., where they are repeatedly subjected to processing under a high temperature in the presence of either trapped organics or water.[4,5]
Summary
More than 250 different zeolite framework types have been recognized by the International Zeolite Association (IZA).[1]. Since January 2015, he has been a project researcher in the Okubo–Wakihara laboratory at The University of Tokyo His current research focuses on the synthesis and modi cation of zeolites for energy and environmental applications. In the FCC process, the fast catalyst deactivation requires a continuous regeneration step carried out in the presence of steam at a temperature that can reach up to 760 C.8,9 These processes make the catalyst vulnerable to structural degradation and possessing high hydrothermal stability is a must for its longer catalytic lifetime. Hydrothermal treatments lead to chemical as well as structural changes which sometimes are irreversible depending on the stability of the zeolitic framework.[10] Exposing the zeolite to those conditions causes the breaking of Si–O(H)–Al bonds by Shanmugam P Elangovan received his PhD degree in Chemistry from Anna University in 1995 under Professor V. Based on the knowledge gained from experimental results, several approaches have been developed to overcome the lack of hydrothermal stability of zeolitic materials
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
