Sorptive Removal of Hydrogen Sulfide from Gas Streams by an Mg‐Al Layered Double Hydroxide

Abstract

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 MgAl 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.

Removal of hydrogen sulfide in the gas phase by carbide slag modified bentonite

“…Comparison of the correlation coefficients in Table 2 shows that the data were best-tted by the Freundlich equation, implying that H 2 S sorption is a surface sorption process. 21 The Langmuir model is described by eqn (2):…”

The effect of cerium incorporation on the catalytic performance of cobalt and manganese containing layer double oxides for acetone oxidation

“…33,34 The cation compositions can also be varied by adjusting the ratio between M 2+ and M 3+ (M 2+ = Ni 2+ , Zn 2+ , Cu 2+ etc; M 3+ = Fe 3+ , Cr 3+ , Al 3+ etc), with M 3+ ranging from 17 to 33 atomic% of the total number of cations. [35][36][37] LDHs are interesting because they have a large number of highly dispersed metal sites both on the external and internal surfaces. 35,38 The anions of LDHs can be removed by calcination at high temperatures (>400 ∘ C) at which LDHs transform to layered double oxides (LDO), according to the reaction: (Fig.…”