DOI: 10.1002/2016GL068638
论文题名: Decrease of aliphatic CHs from diatoms by in situ heating infrared microspectroscopy
作者: Alipour L. ; Nakashima S.
刊名: Geophysical Research Letters
ISSN: 0094-9090
EISSN: 1944-8821
出版年: 2016
卷: 43, 期: 8 起始页码: 3670
结束页码: 3676
语种: 英语
英文关键词: aliphatic hydrocarbon
; diatom
; infrared spectroscopy
Scopus关键词: Activation energy
; Chemical activation
; Hydrocarbons
; Infrared spectroscopy
; Kerogen
; Microoptics
; Aliphatic hydrocarbons
; Biological structures
; Conventional hydrocarbons
; Diatom
; First order kinetics
; Infrared micro-spectroscopy
; IR micro-spectroscopy
; Organic transformations
; Rate constants
; Bacillariophyta
英文摘要: In situ heating IR microspectroscopy at 260-300°C under air and N2 conditions has been conducted on diatom frustules to examine aliphatic CH losses during heating, simulating their changes with burial-diagenesis. Assuming a reaction model made up of two first-order kinetic relations, reaction rate constants k1 and k2 and activation energies (Ea) were evaluated for aliphatic CHs. The rate constants for loss of aliphatic CHs of diatom frustules under air and N2 flow are much larger, with much smaller activation energies (57-109 kJ/mol: air; 14-44 kJ/mol: N2), than those for conventional hydrocarbon generation reactions from kerogens (170-370 kJ/mol) studied at higher temperatures (350-450°C). The CH decrease rates are somewhat different from the amide I decrease (protein degradation) rates. The obtained results suggest that organic transformation reactions including degradation of aliphatic CHs inside the diatom silica frustules might be quite different from those of kerogens separated from the biological structures. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964354675&doi=10.1002%2f2016GL068638&partnerID=40&md5=4e1c70d167eb73310c95387c68f6e3a6
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10053
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth and Space Science, Osaka University, Toyonaka, Japan
Recommended Citation:
Alipour L.,Nakashima S.. Decrease of aliphatic CHs from diatoms by in situ heating infrared microspectroscopy[J]. Geophysical Research Letters,2016-01-01,43(8).