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Sorptive Removal of Hydrogen Sulfide from Gas Streams by an Mg‐Al Layered Double Hydroxide
Author(s) -
Zhao Qian,
Tian Senlin,
Zhang Jiaojiao,
Zhan Shujiao,
Sheng Tao,
Ning Ping
Publication year - 2015
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22208
Subject(s) - sorption , hydrogen sulfide , hydroxide , layered double hydroxides , adsorption , sulfide , ion exchange , chemistry , inorganic chemistry , redox , hydrogen , chemical engineering , ion , sulfur , organic chemistry , engineering
Mg‐Al layered double hydroxides (Mg‐Al LDHs) were used as an adsorbent for hydrogen sulfide (H 2 S) removal. Removal efficiency of H 2 S by the Mg‐Al LDH has been investigated at different temperatures and humidity. The results have shown Mg‐Al LDH to be highly promising as an adsorbent for H 2 S removal. Research results about sorption mechanisms indicate that at lower temperatures (20 ºC), H 2 S removal by Mg‐Al LDHs is mainly a physical sorption process; however, at higher temperature (> 40 ºC), it is dominated by chemical reactions involving ion exchange. Confirmation of the redox reaction between H 2 S and Mg‐Al LDHs was provided by XPS data. The results obtained demonstrate that the H 2 S removal efficiency of Mg‐Al LDHs increases with the temperature increasing, and decreases with the water vapour content increasing.