TY - JOUR
T1 - An efficient SO2-adsorbent from calcination of natural magnesite
AU - Zhang, Qiang
AU - Tao, Qi
AU - He, Hongping
AU - Liu, Hongmei
AU - Komarneni, Sridhar
N1 - Funding Information:
The financial supports were from the National Natural Science Foundation of China (No. 41372048) and the Foshan-Chinese Academy of Sciences Cooperation Project (No. 20111071010019).
Publisher Copyright:
© 2017 Elsevier Ltd and Techna Group S.r.l.
PY - 2017/10/15
Y1 - 2017/10/15
N2 - MgO-based adsorbents were prepared by controlling the temperature of magnesite calcination, and the adsorption mechanism of SO2 and these adsorbents were investigated. The obtained adsorbents were characterized by a combination of characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption/desorption analysis and Hammett indicator method. XRD patterns and TEM images revealed that a complete decarbonation of MgCO3 occurred at ca. 650 °C, and the crystallinity and crystal size of MgO increased with the increase of calcination temperature. The maximum specific surface area (SBET = 69.6 m2/g) was obtained for the sample calcined at 650 °C (M-650), which also had the maximum value of base site density as revealed by the Hammett indicator tests. The adsorption capacity of adsorbents towards SO2 increased with the increase of the base site density and M-650 with the highest base site density displayed the maximum adsorption capacity. The adsorption of SO2 onto MgO was mainly chemisorption, resulting in the formation of magnesium sulfite and magnesium sulfate on the surface of MgO-based adsorbents, as indicated by X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared (FTIR) spectra. The chemically bound SO2 could be desorbed at ca. 435 °C as revealed by thermal analysis under N2. This study suggests that calcination of naturally occurring magnesite is highly amenable to obtain efficient SO2 adsorbents.
AB - MgO-based adsorbents were prepared by controlling the temperature of magnesite calcination, and the adsorption mechanism of SO2 and these adsorbents were investigated. The obtained adsorbents were characterized by a combination of characterization techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption/desorption analysis and Hammett indicator method. XRD patterns and TEM images revealed that a complete decarbonation of MgCO3 occurred at ca. 650 °C, and the crystallinity and crystal size of MgO increased with the increase of calcination temperature. The maximum specific surface area (SBET = 69.6 m2/g) was obtained for the sample calcined at 650 °C (M-650), which also had the maximum value of base site density as revealed by the Hammett indicator tests. The adsorption capacity of adsorbents towards SO2 increased with the increase of the base site density and M-650 with the highest base site density displayed the maximum adsorption capacity. The adsorption of SO2 onto MgO was mainly chemisorption, resulting in the formation of magnesium sulfite and magnesium sulfate on the surface of MgO-based adsorbents, as indicated by X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared (FTIR) spectra. The chemically bound SO2 could be desorbed at ca. 435 °C as revealed by thermal analysis under N2. This study suggests that calcination of naturally occurring magnesite is highly amenable to obtain efficient SO2 adsorbents.
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U2 - 10.1016/j.ceramint.2017.06.130
DO - 10.1016/j.ceramint.2017.06.130
M3 - Article
AN - SCOPUS:85021238687
SN - 0272-8842
VL - 43
SP - 12557
EP - 12562
JO - Ceramics International
JF - Ceramics International
IS - 15
ER -