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Organic‐Free, ZnO‐Assisted Synthesis of Zeolite FAU with Tunable SiO 2 /Al 2 O 3 Molar Ratio
Author(s) -
Guo Ya,
Sun Tianjun,
Gu Yiming,
Liu Xiaowei,
Ke Quanli,
Wang Shudong
Publication year - 2018
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201800178
Subject(s) - aluminosilicate , tetramethylammonium hydroxide , zeolite , molar ratio , zinc , crystallization , materials science , molar , tetramethylammonium , chemical engineering , adsorption , aluminium , inorganic chemistry , catalysis , chemistry , nanotechnology , organic chemistry , metallurgy , medicine , ion , dentistry , engineering
Abstract Zeolite FAU with tunable SiO 2 /Al 2 O 3 molar ratio has been successfully synthesized in the absence of organic structure‐directing agents (OSDA). Specifically, the addition of zinc species contributes to the feasible and effective adjustment of the framework SiO 2 /Al 2 O 3 molar ratio between about 4 and 6 depending on the amount of zinc species added in the batch composition. In contrast, a typical OSDA such as tetramethylammonium hydroxide (TMAOH) has a limited effect on the SiO 2 /Al 2 O 3 molar ratio of the zeolite. The role of zinc species is essential for the crystallization of zeolite FAU with a higher SiO 2 /Al 2 O 3 molar ratio under the particular synthesis conditions. It is speculated that zinc species may suppress the incorporation of aluminum into the aluminosilicate framework, which is due to the Coulombic repulsive interaction. A higher SiO 2 /Al 2 O 3 molar ratio is also found to be accompanied by a lower CO 2 adsorption heat for CO 2 /CH 4 separation.