DOI: 10.1016/j.jcou.2017.03.008
Scopus记录号: 2-s2.0-85015933940
论文题名: Remarkable effect of moisture on the CO2 adsorption of nano-silica supported linear and branched polyethylenimine
作者: Zhang H. ; Goeppert A. ; Olah G.A. ; Prakash G.K.S.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 19 起始页码: 91
结束页码: 99
语种: 英语
英文关键词: Branched polyethylenimine
; CO2 capture
; Linear polyethylenimine
; Nano-silica
; Promoting effect of moisture
; Solid adsorbent
Scopus关键词: Adsorbents
; Adsorption
; Energy conservation
; Hydrophilicity
; Hydrophobicity
; Moisture
; Silica
; Linear polyethylenimine
; Nano Silica
; Polyethylenimines
; Promoting effect
; Solid adsorbents
; Carbon dioxide
英文摘要: Linear and branched polyethylenimines (PEIs) impregnated on hydrophilic and hydrophobic silica were prepared and evaluated for the effect of moisture on CO2 adsorption. The adsorbents were exposed to exhaustive conditions such as varying temperature, CO2 concentration, and specific humidity (SH) levels. Remarkable adsorption enhancements were observed when the adsorbents were exposed to a SH of 3.8-11.5 mg H2O/g at 25 °C. Further increase of the SH above 11.5 mg H2O/g either decreased the CO2 uptake for branched PEI or had no additional benefit for linear PEI. Increasing the loading of PEI in the adsorbent resulted in an increase in water adsorption. However, branched PEI was more hydrophilic than its linear counterpart. Replacing the hydrophilic fumed silica support with a hydrophobic silica support decreased the overall water uptake while maintaining similar CO2 capture capacity. Considering that these types of adsorbents are designed to be recycled preferably for thousands of adsorption/desorption cycles, this could translate into significant energy savings in the regeneration step where any water present on the adsorbent would also have to be heated and desorbed. © 2017 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52728
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Zhang H.,Goeppert A.,Olah G.A.,et al. Remarkable effect of moisture on the CO2 adsorption of nano-silica supported linear and branched polyethylenimine[J]. Journal of CO2 Utilization,2017-01-01,19