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Shen, Qiuwan,Zheng, Ying,Luo, Cong,Zheng, Chuguang Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Perovskite-type oxides are promising oxygen carriers in producing oxygen-enriched $CO_2$ gas stream for oxyfuel combustion. In this study, a new series of $SrCo_{1-x}Fe_xO_{3-{\delta}}$ (x = 0.2, 0.4, 0.6, 0.8) was prepared and used to produce $O_2/CO_2$ mixture gas. The phase, crystal structure, and morphological properties of $SrCo_{1-x}Fe_xO_{3-{\delta}}$ were investigated through X-ray diffraction, specific surface area measurements, and environmental scanning electron microscopy. The oxygen desorption performance of $SrCo_{1-x}Fe_xO_{3-{\delta}}$ was studied in a fixed-bed reactor system. Results showed that the different x values of $SrCo_{1-x}Fe_xO_{3-{\delta}}$ have no obvious effects on crystalline structure. However, the oxygen desorption performance of $SrCo_{1-x}Fe_xO_{3-{\delta}}$ is improved by Co doping. Moreover, $SrCo_{0.8}Fe_{0.2}O_{3-{\delta}}$ synthesized via a new EDTA method has a larger BET surface area ($40.396m^2/g$), smaller particle size (48.3 nm), and better oxygen production performance compared with that synthesized through a liquid citrate method.
Qiuwan Shen,Ying Zheng,Cong Luo,Chuguang Zheng 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6
Perovskite-type oxides are promising oxygen carriers in producing oxygen-enriched CO2 gas stream for oxyfuel combustion. In this study, a new series of SrCo1-xFexO3-δ (x = 0.2, 0.4, 0.6, 0.8) was prepared and used to produce O2/CO2 mixture gas. The phase, crystal structure, and morphological properties of SrCo1-xFexO3-δ were investigated through X-ray diffraction, specific surface area measurements, and environmental scanning electron microscopy. The oxygen desorption performance of SrCo1-xFexO3-δ was studied in a fixed-bed reactor system. Results showed that the different x values of SrCo1-xFexO3-δ have no obvious effects on crystalline structure. However, the oxygen desorption performance of SrCo1-xFexO3-δ is improved by Co doping. Moreover, SrCo0.8Fe0.2O3-δ synthesized via a new EDTA method has a larger BET surface area (40.396 m2/g), smaller particle size (48.3 nm), and better oxygen production performance compared with that synthesized through a liquid citrate method.
Cong Luo,Ying Zheng,Ning Ding,Chuguang Zheng 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.4
To improve the stability of CaO adsorption capacity for CO_2 capture during multiple carbonation/calcination cycles, modified CaO-based sorbents were synthesized by sol-gel-combustion-synthesis (SGCS) method and wet physical mixing method, respectively, to overcome the problem of loss-in-capacity of CaO-based sorbents. The cyclic CaO adsorption capacity of the sorbents as well as the effect of the addition of La_2O_3 or Ca_12Al_14O_33 was investigated in a fixed-bed reactor. The transient phase change and microstructure were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FSEM), respectively. The experimental results indicate that La_2O_3 played an active role in the carbonation/calcination reactions. When the sorbents were made by wet physical mixing method,CaO/Ca_12Al_14O_33 was much better than CaO/La_2O_3 in cyclic CO_2 capture performance. When the sorbents were made by SGCS method, the synthetic CaO/La_2O_3 sorbent provided the best performance of a carbonation conversion of up to 93% and an adsorption capacity of up to 0.58 g-CO_2/g-sorbent after 11 cycles.
Cong Luo,Ying Zheng,Yongqing Xu,Haoran Ding,Chuguang Zheng,Changlei Qin,Bo Feng 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
A novel calcium-based pellet was prepared by extrusion of sol-gel CaO powder and cement with high aluminum- based content. Limestone was used for comparison. The cyclic CO2 capture performance and carbonation kinetics of the sorbents were investigated in a thermogravimetric analyzer (TGA). The changes in phase and microstructure were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer Emmet Teller (BET) surface area, respectively. The results indicate that the pellet consisted of CaO and Ca12Al14O33 after initial calcination. Limestone reactivity decreased dramatically with the increase in the cycle number, whereas the pellet showed a relatively stable cyclic CO2 capture performance with high reactivity. The CO2 capture capacity of the pellet achieved 0.43 g CO2/g sorbent after 50 cycles at 650 oC and 850 oC for carbonation and calcination, respectively. Moreover, the pellet obtained fast carbonation rates with slight decay after multiple cycles. The porous microstructure of the pellet contributed to the high reactivity of the sorbent during high temperature reactions, and the support material of Ca12Al14O33, enhanced the cyclic durability of the calcium-based sorbents.