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CO 2 adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives
Author(s) -
Dindi Abdallah,
Viet Quang Dang,
AbuZahra Mohammad R.M.
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12940
Subject(s) - fly ash , adsorption , zeolite , sorbent , surface modification , amine gas treating , desorption , chemistry , nuclear chemistry , inorganic chemistry , chemical engineering , materials science , organic chemistry , catalysis , engineering
Fly ash was converted to a Cancrinite‐type zeolite and then functionalized with various amines to investigate its ability to adsorb CO 2 . Fly ash was first subjected to thermal‐alkaline treatment followed by hydrothermal treatment to remove unburned carbon and transform it into a cancrinite‐type zeolite before being functionalized with either 3‐aminopropyltriethoxysilane (APTES), diethanolamine (DEA), or monoethanolamine (MEA). The resulting Cancrinite and its functionalized products were characterized by various techniques to confirm the success of fly ash to Cancrinite transformation and functionalization method. Cancrinite has significant improvement in surface area (77.7 m 2 g −1 ) in comparison with original fly ash (11.2 m 2 g −1 ), but its CO 2 adsorption is very poor, about 6.6 mg g −1 . Amine functionalization caused a reduction in the surface area and porosity of the fly ash Cancrinite, however, it enhanced the CO 2 adsorption significantly. While the sorbents impregnated with DEA and MEA had higher CO 2 adsorption capacities (49 and 84 mg CO 2 /g adsorbent respectively) than the sorbent grafted with APTES (24 mg CO 2 /g adsorbent), the grafted sorbent was more stable over multiple adsorption–desorption cycles. This study demonstrated that fly ash‐derived Cancrinite‐type zeolite has low CO 2 adsorption in spite of its high surface area, however, its CO 2 adsorption can be improved by amine‐functionalization. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 77–88, 2019