Development of Ca(OH)2nanosorbent for intermediate-high temperature CO2 capture via wet chemical route in N,N-Dimethylformamide solvent
CO2 is the major anthropogenic greenhouse gas which contributes to the increasing atmospheric CO2 concentration, leading to serious global warming and climate change. Thus, the present paper investigates the CO2-capture performance of synthesized calcium hydroxides, Ca(OH)2nanosorbent at intermed...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trans Tech Publications Ltd.
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46412/ http://irep.iium.edu.my/46412/ http://irep.iium.edu.my/46412/ http://irep.iium.edu.my/46412/1/Farah_Diana_Advanced_Materials_Research_Development_of_Ca%28OH%29_2nanosorbent_for_Intermediate-high_Temperature_CO_2_Capture_via_Wet_Chemical_Route_in_N%2CN-Dimethylformamide_Solvent.pdf |
| Summary: | CO2 is the major anthropogenic greenhouse gas which contributes to the increasing
atmospheric CO2 concentration, leading to serious global warming and climate change. Thus, the
present paper investigates the CO2-capture performance of synthesized calcium hydroxides,
Ca(OH)2nanosorbent at intermediate-high temperatures which are 350, 450, 550 and 650ºC. CO2
adsorption performance was analysed by thermo-gravimetric analyser (TGA).The CO2 adsorption
temperature strongly influenced the capture performance of the sorbent. Facile wet chemical
technique was utilized to synthesize Ca(OH)2 nanorod sorbent structures using calcium nitrate
tetrahydrate, Ca(NO3)2.4H2O as the calcium precursor, and precipitated with sodium hydroxides
(NaOH) in N,N-Dimethylformamide (DMF) mixed deionized(DI) water media at 55 ºC. X-ray
diffraction (XRD) result exhibited Ca(OH)2hexagonal crystal structures. The Ca(OH)2 particle size
and morphological properties before and after CO2 adsorption are studied by Field Emission
Scanning Electron Microscopy(FESEM). The FESEM image indeed showed the rod like shape of
Ca(OH)2nanosorbent with rod length approximately700 nm while the diameter 140nm. When CO2
molecules were adsorbed by Ca(OH)2nanosorbent, the nanorod structures are changed to rigid
interconnected each other like a lump shaped. Ca(OH)2nanosorbentseems to be a potentially good
absorbent for capturing CO2when increased temperatures. However, at intermediate temperature
350 and 450ºC, the synthesized Ca(OH)2nanosorbent demonstrated higher CO2 adsorption (141 to
220 mg/g CO2)than others intermediate temperature CO2 sorbent such as layer double
hydroxides(LDH), lithium zirconates (LiZrO3) and hydrotalcite. |
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