期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 374, 期 -, 页码 365-371出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.04.049
关键词
Ni-Al LDH; Exfoliation; Nanosheets; CO2 capture
资金
- National Natural Science Foundation of China [21706224]
- Science and Technology Innovation Commission of Shenzhen Municipality [JCYJ20170307090749744]
- Research Grants Council of Hong Kong [CityU 21301817]
CO2 capture is projected as one of the pragmatic approaches to deal with the global warming phenomenon. Adsorption-based CO2 capture is considered an economically attractive option to reduce CO2 emission. The success of the adsorption-based capture primarily relies on adsorbents and thus a variety of adsorbents have been investigated in the literature. We here report a high surface area (210.2 m 2 /g) exfoliated Ni-Al LDH nanoplatelet as a promising candidate for CO2 capture at an intermediate temperature of 200 degrees C applicable to integrated gasification combined cycle (IGCC) and sorption enhanced water gas shift (SEWGS) reactions. The materials were well characterized by PXRD, TGA, FTIR, TEM, ICP-OES, and N-2 adsorption surface area, and pore size distribution techniques. A unique nanoflower morphology comprising of exfoliated LDH platelets of ca. S layer thiclmess was obtained. The CO2 capture capacity (0.66 mmol/g) of the exfoliated Ni-Al LDH nanoplatelet is comparable to that of the widely reported Mg-Al LDH-derived mixed oxides and MgO-based adsorbents. Provided that Ni-Al and other transition metal LDH materials are known to exhibit superior catalytic properties for CO2 methanation, this work could pave the way for development of dual-functional materials for CO2 capture and conversion.
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