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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