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Study on Adsorption Properties of Ammonium Exchanged Chabazite for CO 2
Author(s) -
Che Shuai,
Du Tao,
Song Yan Li,
Fang Xin,
Wang Yi Song
Publication year - 2019
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201900040
Subject(s) - chabazite , adsorption , chemistry , molecule , ammonium , zeolite , hydrothermal circulation , inorganic chemistry , ion exchange , ion , chemical engineering , organic chemistry , catalysis , engineering
Ammonium type chabazite (NH 4 CHA) and magnesium type chabazite (MgCHA) was prepared by hydrothermal synthesis and hydrothermal ion exchange. The structure and morphology of ion‐exchanged chabazite was characterized with various experimental techniques such as XRD, SEM, and ICP. The gas adsorption amount of chabazite decreases gradually with increase in temperature or decrease in pressure. The adsorption capacity of NH 4 CHA to CO 2 was 3.33 mmol · g –1 at 273 K, and the saturated adsorption capacity of NH 4 CHA reached 3.88 mmol · g –1 under extreme pressure. The CO 2 molecule was more likely to be adsorbed by all chabazite samples than the N 2 molecule due to its linear molecular structure and greater molecular polarity. NH 4 CHA exhibited larger CO 2 /N 2 selectivity, which first increased and then declined with the temperature decreasing, and reached the maximum value between 400 K to 450 K.