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Ethanol to Aromatics on Modified H‐ZSM‐5 Part I: Interdependent Dealumination Actions
Author(s) -
Seifert Markus,
Marschall Mathias S.,
Gille Torsten,
Jonscher Clemens,
Busse Oliver,
Paasch Silvia,
Brunner Eike,
Reschetilowski Wladimir,
Weigand Jan J.
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202001344
Subject(s) - zeolite , physisorption , chemistry , hydrochloric acid , zsm 5 , coke , microporous material , molecular sieve , inorganic chemistry , sodium hydroxide , chemical engineering , adsorption , organic chemistry , catalysis , engineering
In this study a H‐ZSM‐5 zeolite (Si/Al=11) was modified by a stepwise treatment with steam, sodium hydroxide and hydrochloric acid. During progressing dealumination by various treatment methods, the drawbacks of initial post‐synthetic steps, e. g. pore‐filling by steam dealumination, are compensated by subsequent steps, e. g. washing by acid, which leads to a scientifically based preparation of required ZSM‐5 zeolite. Solid‐state properties of as‐synthesized and modified zeolites are determined by structural (XRD, ICP‐OES, NMR), textural (physisorption, laser scattering) and acid sites analysis (TPAD). Consequently, extended dealumination without structural damage is demonstrated. Its origin by framework dealumination and pore cleaning is verified in ethanol to hydrocarbon process (ETH) by shape‐selective formation of coke and aromatics, characterized by “aromatics index” ( AI ) .