A new type of calcium-based regenerable carbon dioxide （CO_2） sorbent, CaO-NiO, was synthesized via the sol-gel method. The as synthesized CO_2 sorbent was in the form of nanoparticles. The CO_2 sorption temperature...A new type of calcium-based regenerable carbon dioxide （CO_2） sorbent, CaO-NiO, was synthesized via the sol-gel method. The as synthesized CO_2 sorbent was in the form of nanoparticles. The CO_2 sorption temperature and capacity of the sorbent were examined using thermogravi- metric analysis （TGA）. The CaO-NiO sorbent is able to capture CO_2 at a lower sorption temperature （465 ℃） than pure calcium oxide （CaO） （600 ℃）. The role of NiO in the CaO-NiO sorbent in lowering the CO_2 sorption temperature was also investigated. The sorbent was char- acterized by X-ray diffractometer （XRD）, N_2 adsorption-desorption analysis, high resolution transmission electron microscopy （HRTEM） and scanning electron microscopy （SEM）. CaO and NiO were found to coexist in the sorbent. Neither solid solution nor mixed metal oxide was formed. NiO did not react with CO_2 in the sorption process; but it worked like a catalyst to promote the CaO carbonation reaction. It is suggested that this new CaO-NiO sorbent may have a promising application as an effective CO_2 sorbent with lower energy consumption.展开更多
基金supported by Long Term Research Grant(LRGS)(203/PKT/6723001) from Ministry of Higher Education(MOHE)Research University Team Grant(1001/PJKIMIA/854001) from University Sains MalaysiaPostgraduate Research Grant Scheme(PRGS) from University Sains Malaysia and USM Fellowship
文摘A new type of calcium-based regenerable carbon dioxide （CO_2） sorbent, CaO-NiO, was synthesized via the sol-gel method. The as synthesized CO_2 sorbent was in the form of nanoparticles. The CO_2 sorption temperature and capacity of the sorbent were examined using thermogravi- metric analysis （TGA）. The CaO-NiO sorbent is able to capture CO_2 at a lower sorption temperature （465 ℃） than pure calcium oxide （CaO） （600 ℃）. The role of NiO in the CaO-NiO sorbent in lowering the CO_2 sorption temperature was also investigated. The sorbent was char- acterized by X-ray diffractometer （XRD）, N_2 adsorption-desorption analysis, high resolution transmission electron microscopy （HRTEM） and scanning electron microscopy （SEM）. CaO and NiO were found to coexist in the sorbent. Neither solid solution nor mixed metal oxide was formed. NiO did not react with CO_2 in the sorption process; but it worked like a catalyst to promote the CaO carbonation reaction. It is suggested that this new CaO-NiO sorbent may have a promising application as an effective CO_2 sorbent with lower energy consumption.
