胺气处理
氧化剂
化学
烟气
小学(天文学)
吸附
降级(电信)
氧化磷酸化
叔胺
氧气
有机化学
天文
计算机科学
生物化学
电信
物理
作者
Praveen Bollini,Seongjin Choi,Jeffrey H. Drese,Christopher W. Jones
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2011-04-22
卷期号:25 (5): 2416-2425
被引量:153
摘要
Coal-fired power plant flue gas exhaust typically contains 3–10% oxygen. While it is known that the monoethanolamine (MEA) oxidative degradation rate is a critical parameter affecting liquid amine absorption processes, the effect of oxygen on the stability of solid amine adsorbents remains unexplored. Here, oxidative degradation of aminosilica materials is studied under accelerated oxidizing conditions to assess the stability of different supported amine structures to oxidizing conditions. Adsorbents constructed using four different silane coupling agents are evaluated, three with a single primary, secondary, or tertiary amine at the end of a propyl surface linker, with the fourth having one secondary propylamine separated from a primary amine by an ethyl linker. Under the experimental conditions used in this study, it was found that both amine type and proximity had a significant effect on oxidative degradation rates. In particular, the supported primary and tertiary amines proved to be stable to the oxidizing conditions used, whereas the secondary amines degraded at elevated treatment temperatures. Because secondary amines are important components of many supported amine adsorbents, it is suggested that the oxidative stability of such species needs to be carefully considered in assessments of postcombustion CO2 capture processes based on supported amines.
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