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Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites
Zeng, Shaojuan1; Wang, Junli1; Li, Pengfei1,2; Dong, Haifeng1; Wang, Hui1; Zhang, Xiaochun1; Zhang, Xiangping1,2
2019-08-15
Source PublicationCHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
Volume370Pages:81-88
Abstract

The emerging of ionic liquids (ILs) provides a promising way to efficiently separate ammonia (NH3) and simultaneously recover NH3 due to their negligible volatility, good affinity with NH3 and designable structures. However, the relatively high viscosities of ILs and the limited gas-liquid interface severely affect gas diffusion in ILs, which hinders their practical use in industries. In this work, in order to overcome the mass-transfer limitations of ILs in gas separation, three metal ILs (MILs), [Bmim](2) [CuCl4], [Bmim](2) [NiCl4] and [Bmim](2)[Co (NCS)(4)], with good affinity toward NH 3 were incorporated into porous silica gels with large surface area and abundant hydroxyl groups, by an impregnation-vaporization method to form novel MIL@silica gel composites for rapid, efficient and reversible adsorption of NH3. The FT-IR and BET results indicated that the prepared adsorbents with different loadings of MILs are mesoporous composites. The [Bmim](2) [Co(NCS)(4)]@silica gel composites not only show much higher NH3 capacity and NH3 selectivity than pristine silica gel and faster adsorption rate than the corresponding pure MILs, but also exhibit excellent reversibility. The highest capacity of NH3 adsorption up to 99.808 mg NH3 center dot(g adsorbent)(-1) in 15 min was obtained when the loading of [Bmim](2)[Co (NCS)(4)] in the MIL@silica gel composite was 48.89 wt%, which could be attributed to the synergistic interaction of the complexation and hydrogen bonding between cobalt coordinated anion and NH 3 as well as mesoporous structures. Moreover, the NH3 absorbed by the [Bmim](2)[Co(SCN)(4)]@silica gel can be completely released in 15 min, and no obvious losses in NH3 capacity were detected during five adsorption and regeneration cycles, indicating great potentials as adsorbents for NH3 separation applications.

KeywordIonic Liquids Metal Ammonia Adsorption Incorporation Mesoporous Composites
DOI10.1016/j.cej.2019.03.180
Language英语
WOS KeywordAbsorption-refrigeration Cycles ; Gas Solubility ; Co2 Capture ; Absorbents ; Sorption ; Phase ; So2
Funding ProjectNational Key R&D Program of China[2017YFB0603301] ; National Natural Science Foundation of China[U1662122] ; National Natural Science Foundation of China[U1704251] ; National Natural Science Foundation of China[21776277] ; Beijing Municipal Natural Science Foundation[2182071]
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China ; Beijing Municipal Natural Science Foundation
WOS IDWOS:000467387200008
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/28126
Collection中国科学院过程工程研究所
Corresponding AuthorZhang, Xiangping
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing Key Lab Ion Liquids Clean Proc, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Coll Chem & Engn, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Shaojuan,Wang, Junli,Li, Pengfei,et al. Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites[J]. CHEMICAL ENGINEERING JOURNAL,2019,370:81-88.
APA Zeng, Shaojuan.,Wang, Junli.,Li, Pengfei.,Dong, Haifeng.,Wang, Hui.,...&Zhang, Xiangping.(2019).Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites.CHEMICAL ENGINEERING JOURNAL,370,81-88.
MLA Zeng, Shaojuan,et al."Efficient adsorption of ammonia by incorporation of metal ionic liquids into silica gels as mesoporous composites".CHEMICAL ENGINEERING JOURNAL 370(2019):81-88.
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