DOI: 10.1016/j.jcou.2018.05.004
Scopus记录号: 2-s2.0-85047293930
论文题名: Structural parameters to consider in selecting silica supports for polyethylenimine based CO2 solid adsorbents. Importance of pore size
作者: Zhang H. ; Goeppert A. ; Kar S. ; Prakash G.K.S.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 26 起始页码: 246
结束页码: 253
语种: 英语
英文关键词: CO2 adsorbents
; CO2 capture
; Hybrid CO2 adsorbents
; Polyethylenimine
; Silica/amine adsorbents
Scopus关键词: Adsorbents
; Adsorption
; Diffusion
; Pore size
; Silica
; Thermogravimetric analysis
; Adsorption capacities
; Adsorption temperature
; CO2 adsorbents
; CO2 capture
; Diffusion control
; Polyethylenimines
; Solid adsorbents
; Structural parameter
; Carbon dioxide
英文摘要: Hybrid solid CO2 adsorbents prepared from commercially available silica and polyethylenimine (PEI) are potential candidate for large scale carbon capture applications. In this study, the effect of the silica support structure and morphology on the CO2 adsorption capacity of the adsorbent was investigated. Two series of silica supports with distinct morphology, i.e. granular and microspherical, available from PQ-Corp., and well defined surface area, pore diameter, and pore volume were loaded with branched PEI. The CO2 adsorption characteristics of these adsorbents were measured using thermogravimetric analysis (TGA). The increase in PEI loading on the porous silica caused a significant decrease in surface area and pore volume. At a certain loading level, the pores were completely filled with PEI, and the CO2 diffusion was hindered resulting in lower adsorption capacity and amine efficiency. With granular silicas, supports having an average pore diameter greater than about 240 Å performed best. However, once this threshold in pore diameter was passed, the adsorption capacity did not improve much further. For microspherical silica supports this threshold was around 300 Å. For supports with a same pore volume, the ones with a larger pore diameter had higher CO2 adsorption capacity, even if their surface area was lower. This difference was mainly due to the easier diffusion of CO2 into the pores, because the phenomenon was more pronounced at a low adsorption temperature (25 °C), where diffusion control was most significant. © 2018 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/111885
Appears in Collections: 气候减缓与适应
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作者单位: Loker Hydrocarbon Research Institute, Department of Chemistry, University of Southern California, 837 Bloom Walk, Los Angeles, CA 90089-1661, United States
Recommended Citation:
Zhang H.,Goeppert A.,Kar S.,et al. Structural parameters to consider in selecting silica supports for polyethylenimine based CO2 solid adsorbents. Importance of pore size[J]. Journal of CO2 Utilization,2018-01-01,26