DOI: 10.1016/j.jcou.2016.06.004
Scopus记录号: 2-s2.0-84978511737
论文题名: Understanding the importance of iron speciation in oil-field brine pH for CO2 mineral sequestration
作者: Córdoba P. ; Liu Q. ; Garcia S. ; Maroto-Valer M.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2016
卷: 16 起始页码: 78
结束页码: 85
语种: 英语
英文关键词: Above-ground brines
; CO2
; Mineralogical sequestration
; Modelling tools
; Oil-field brines
Scopus关键词: Alkalinity
; Carbon
; Carbon dioxide
; Carbonates
; Groundwater
; Iron compounds
; Minerals
; Oil fields
; Oil well flooding
; Suspensions (fluids)
; X ray powder diffraction
; Above grounds
; Alkaline conditions
; Carbonates species
; Mineral carbonates
; Mineral sequestration
; Mineralogical sequestration
; Modelling tools
; Oil field brines
; Brines
英文摘要: Carbon dioxide (CO2) mineralogical sequestration using oil-field brines (above-ground field brines) is gaining attention for the storage of CO2 into stable mineral carbonates. This involves complex processes that are affected by brine composition, pressure, temperature and pH where the latter is the key parameter, as carbonation conversion rates and the specific carbonates species formed are strongly dependent on pH. This study investigates the effect of iron (Fe) in the pH of three synthetic brines prepared as analogue to oil-field brine by combining a number of experimental and modelling tools to elucidate whether or not Fe speciation may affect the pH of brines. X-Ray powder Diffraction (XRD) analyses were also carried out to characterise the mineralogy of the synthetic brines. Results indicate that the Fe speciation affects the pH of oil-field brines; brines containing Fe3+ experiment a rapid increase of the pH as a consequence of Fe2O3 precipitation by aging of Fe(OH)3 under alkaline conditions. Brines containing Fe2+ show a sharp drop of the pH as a result of air oxidation of highly alkaline Fe(OH)2 suspension induced by KOH addition by means of dissolution-oxidation-crystallisation mechanism where particles of Fe(OH)2 provide the substrate for the γ-FeO(OH) growth. The master variable governing the rates at which these compounds form is pH. © 2016 Elsevier Ltd. All rights reserved. 资助项目: Engineering and Physical Sciences Research Council
; Engineering and Physical Sciences Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52858
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Córdoba P.,Liu Q.,Garcia S.,et al. Understanding the importance of iron speciation in oil-field brine pH for CO2 mineral sequestration[J]. Journal of CO2 Utilization,2016-01-01,16