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Characterization of Chars from Fast Pyrolysis and Gasification of Switchgrass and Corn Stover

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Characterization of Chars from Fast Pyrolysis and Gasification of Switchgrass and Corn Stover

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    1. Characterization of Chars from Fast Pyrolysis and Gasification of Switchgrass and Corn Stover Catherine Brewer, Rachel Unger, Robert Brown Center for Sustainable Environmental Technologies Iowa State University August 11, 2009

    2. Today’s Presentation Biochar Engineering Incubation Study Overview Meet the Chars General Characterization Results Solid-State 13C NMR Future Work

    3. Biochar Engineering

    4. Incubation Study Two Part Study: Char characterization 8 week soil incubation Collaboration between CSET and Agronomy 17 chars made under known conditions Results to be used to select chars for micro-plot field study

    5. Corn Stover Chars

    6. Switchgrass Chars

    7. Hardwood Chars

    8. Results: Ash Content

    9. Results: BET Surface Area

    10. Solid-State 13C NMR The Techniques: Qualitative 1H-13C Cross Polarization Magic Angle Spinning (CP/MAS) with TOtal Supression of Spinning Sidebands (TOSS) Quantitative 13C Direct Polarization (DP/MAS) DP/MAS with Dipolar Dephasing, a.k.a. “Gated Decoupling” (GADE) DP/MAS with Recoupled Dipolar Dephasing, a.k.a. “Gated Recoupling” (GARE)

    11. Solid-State 13C NMR Switchgrass Feedstock, Fast and Slow Pyrolysis Chars by CP/TOSS at 7 kHz MAS frequency. OCH: includes both alcohol and ether moieties

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