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ITQ‐69: A Germanium‐Containing Zeolite and its Synthesis, Structure Determination, and Adsorption Properties
Author(s) -
Sala Andrés,
PérezBotella Eduardo,
Jordá Jose L.,
Cantín Angel,
Rey Fernando,
Valencia Susana
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202100822
Subject(s) - zeolite , triclinic crystal system , calcination , rietveld refinement , adsorption , sodalite , olefin fiber , chemistry , crystal structure , selectivity , selective adsorption , powder diffraction , crystallography , inorganic chemistry , chemical engineering , materials science , organic chemistry , catalysis , engineering
In this work, a new zeolite named as ITQ‐69, has been synthesized, characterized and its application as selective adsorbent for industrially relevant light olefins/paraffins separations has been assessed. This material has been obtained as pure germania as well as silica‐germania zeolites with different Si/Ge ratios using a diquaternary ammonium cation as organic structure directing agent. Its structure was determined by single‐crystal X‐Ray diffraction showing a triclinic unit cell forming a tridirectional small pore channel system (8×8×8R). Also, it has been found that Si preferentially occupies some special T sites of the structure as deduced from Rietveld analysis of the powder X‐ray diffraction patterns. In addition, the new zeolite ITQ‐69 has been found to be stable upon calcination and thus, its adsorption properties were evaluated, showing a promising kinetic selectivity for light olefin separations in the C3 fraction.