Do All Carbonized Charcoals Have the Same Chemical Structure? 1. Implications of Thermogravimetry-Mass Spectrometry Measurements
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- 作者：Erika Mé ; szá ; ros ; Emma Jakab ; Gá ; bor Vá ; rhegyi ; Jared Bourke ; Merilyn Manley-Harris ; Teppei Nunoura ; Michael Jerry Antal ; Jr.
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2007
- 出版时间：August 29, 2007
- 年：2007
- 卷：46
- 期：18
- 页码：5943 - 5953
- 全文大小：557K
- 年卷期：v.46,no.18(August 29, 2007)
- ISSN：1520-5045
文摘
A half century ago, Rosalind Franklin identified two distinct families of organic materials: those that becomegraphitic during carbonization at high temperatures and those that do not. According to Franklin, sucrose-derived biocarbons showed "no trace of homogeneous development of the true graphitic structure, even afterheating to 3000 
C" [Proc. R. Soc. A 1951, 209, 196-218]. Franklin concluded that "non-graphitizing" carbons(e.g., sucrose biocarbons) are typically formed from oxygen-rich or hydrogen-poor substances that developa "strong system of cross-linking, which immobilizes the structure and unites the crystallites in a rigid mass".In this work, we show that there is a spectrum of non-graphitizing biocarbons ranging from those that releaselittle CO during carbonization at temperatures approaching 1000 C to those that strongly and persistentlyemit CO during carbonization at temperatures approaching 1000 C. Typically, very low-ash biocarbons arenot persistent CO emitters, but biocarbons with moderate ash contents can also be a member of this class iftheir ash lacks the catalytic species K, P, Mg, and/or Na that appear to be responsible for persistent COevolution at 1000 C.
C" [Proc. R. Soc. A 1951, 209, 196-218]. Franklin concluded that "non-graphitizing" carbons(e.g., sucrose biocarbons) are typically formed from oxygen-rich or hydrogen-poor substances that developa "strong system of cross-linking, which immobilizes the structure and unites the crystallites in a rigid mass".In this work, we show that there is a spectrum of non-graphitizing biocarbons ranging from those that releaselittle CO during carbonization at temperatures approaching 1000 C to those that strongly and persistentlyemit CO during carbonization at temperatures approaching 1000 C. Typically, very low-ash biocarbons arenot persistent CO emitters, but biocarbons with moderate ash contents can also be a member of this class iftheir ash lacks the catalytic species K, P, Mg, and/or Na that appear to be responsible for persistent COevolution at 1000 C.