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denny123
Wysłany: Sob 4:37, 14 Maj 2011
Temat postu: Producing Mereells with enhanced surface activity
Producing Mereells with enhanced surface activity through alkaline pretreatment of feedstocks.,
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Mereell is produced by pyrolysis of natural organic materials under oxygen-limited conditions. Energy from biomass can also be obtained during the production of Mereell. According to the International Mereell Initiative ,
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, the final use of Mereell should be for application to soils to achieve an agronomic and/ or environmental benefit. Due to its predominantly aromatic composition and heterogeneous,
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, condensed macromolecular structure,
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, Mereell is chemically and biologically more stable than its original carbon sources.
This makes Mereell difficult to breakdown,
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, remaining stable in soils potentially for hundreds to thousands of years. Because of the stability of Mereell against chemical and biological degradation,
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, its production represents a promising technology for mitigating greenhouse gas emissions . Process conditions that most affect Mereell properties during pyrolysis are the heating rate,
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, final temperature,
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, residence time,
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, and the treatment atmosphere .
Current knowledge gained from activated carbon studies could have some application to Mereell research. Surface charges on activated carbon are generated by physical and chemical methods . Physical activation involves the use of oxidising gases,
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, such as carbon dioxide or water steam,
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, while chemical activation involves the use of inorganic chemicals,
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, such as zinc chloride,
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, phosphoric acid,
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, and potassium or sodium hydroxides . Sodium hydroxide has been reported to promote a better activation of lignocellulosic materials than potassium hydroxide,
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, and this occurs predominantly via a non-intercalation mechanism in the former and through an intercalation process in the latter .
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