Open AccessTemplate Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO2/CH4 Gas Separation
Author(s) -
Heli Wang,
Meihua Zhu,
Ting Wu,
Qinliang Jiang,
Fei Zhang,
WU Ya-fen,
Xiangshu Chen
Publication year - 2022
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c06215
Subject(s) - calcination , zeolite , membrane , gas separation , sodium hydroxide , recrystallization (geology) , sodium , selectivity , chemical engineering , chemistry , chloride , air separation , inorganic chemistry , materials science , catalysis , organic chemistry , paleontology , biochemistry , oxygen , engineering , biology
Hydrothermal synthesis with an organic template of N , N , N trimethyl-1-adamantammonium hydroxide (TMAdaOH) is the most commonly used method to prepare an SSZ-13 zeolite membrane. In this paper, the synthesized membrane was treated in heated sodium chloride to remove TMAdaOH instead of calcination in air. The surface of the membrane was modified by the heated NaCl and resulted in an improved CO 2 /CH 4 gas separation selectivity. TMAda + in the channels of SSZ-13 zeolite decomposed completely, and the treatment time was shortened significantly compared with calcination in air. The recrystallization of zeolite reacting with heated NaCl was the possible reason for the improved gas separation performance of the membrane.