Adsorption of CO2 on Mixed Oxides Derived from Ca-Al-ClO4-Layered Double Hydroxide

作者：Wang, Shengping^*; Li, Chun; Yan, Suli; Zhao, Yujun; Ma, Xinbin

来源：Energy & Fuels, 2016, 30(2): 1217-1222.

DOI：10.1021/acs.energyfuels.5b02506

• LAYERED DOUBLE HYDROXIDES
• PRODUCT LAYER
• CALCIUM-OXIDE
• CAPTURE
• TEMPERATURE
• SORBENTS
• CAO
• PRECURSORS
• HYDROTALCITES
• CALCINATION

In this paper, we studied the CO2 adsorption performances of well-mixed oxides with Ca/Al ratios of 2:1, 2.5:1, 3:1, 3.5:1, and 4:1, which were prepared through the thermal decomposition of co-precipitated hydrotalcite-like Ca-Al--ClO4 precursors. The mixed oxides with a Ca/Al ratio of 3 exhibited the best performance at the adsorption temperature of 600 degrees C, and approximately 87% of the initial CO2 capture capacity was retained after 50 cycles of multiple carbonation/calcination tests. The favorable cyclical performance of the adsorbent is attributed to the homogeneous distribution of Al2O3 among CaO particles, which effectively prevented the aggregation and sintering of CaO crystallite. Furthermore, a smaller particle size (about 30 nm) of CaO allowed for as much carbonation as possible to take place at the rapid reaction-controlled regime rather than at the diffusion-controlled regime, resulting in the favorable long-term adsorption performance.

• 出版日期2016-2
• 单位天津大学