Preparation of activated carbon from hydrothermal carbonized bark
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1 Preparation of activated carbon from hydrothermal carbonized bark M. Götz a *, A. Voglhuber-Slavinsky a, D. Wüst a,b, *, O. Sahin b, A. Kruse a,b a University of Hohenheim, Institute of Agricultural Engineering, Chair of Conversion Technology an Life Cycle Assessment of Renewable Resources, Stuttgart-Hohenheim, Germany b Karlsruher Institute of Technology, Institute of Catalysis Research and Technology, Eggenstein-Leopoldhafen, Germany * Contact: wuest.dominik@uni-hohenheim.de, markus_goetz@uni-hohenheim.de
2 Motivation Bio-based charcoals and activated carbons for the chemical industry Bark as a suitable feedstock for activated carbons Use of residues Existing infrastructure and distribution channels Increasing the local added value of forestry (625 /25 kg) (Agros Organics) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 2
3 Basic Concept Conversion Activation Fig. 1: Process chain from cork oak bark, poplar bark and robinia bark to hydrothermal carbonized charcoal (HTC) and activated carbon (Hepp, Gurk, 2014; own figures) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 3
4 Hydrothermal Carbonization (HTC) Thermochemical transformation in liquid water under increased temperature and resulting pressure (closed system) Production of solid humus-like substances and porous lignite-like particles (Hydrochars) Reduction of the H/C and O/C ratio by dehydration t = 2-8 h, T = C, p max : MPa Process parameters: T = 160/ 220 C for t = 1 / 5 h, p max : 2.5 MPa, DM = 20 wt% Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 4
5 Activated Carbon Increase of the inner surface/pore volume with physical or chemical treatments Chosen methods: 2 different chemical treatments: 250 ml KOH-solution (c(koh)= 0.5 mol L -1 ) g -1 hydrochar Stirred for 1 h, T = 30 C ( treatment ) Reaction at 450 C in a muffle furnace with solid KOH t = 1 h ( activation ) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 5
6 Coalification chart bark hydrochar activation treatment Fig. 3: Coalification chart/ Van-Krevelen-Diagram of the feedstock poplar bark and the products hydrochar, activated carbon (activation) and activated carbon (treatment) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 6
7 FTIR-Spectra Fig. 4: FTIR-Spectra of the Robinia products activated carbon activation (left red curve) and activated carbon treatment (left lower curve) and the fossil activated carbon Norit C Gran (right black curve) (own figure, Lai,2014) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 7
8 Scanning Electron Microscope Fig. 5: SEM-image of the poplar product treatment (left side) and of fossil activated carbon Silacarbon AK-K835 Magnification: times. (own figure, Lai, 2014) Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 8
9 Inner Surface Tab. 1: Inner Surfaces in m 2 g -1 according to Brunauer, Emmet and Teller of all prepared products. Robinia Hydrochar Measurements failed (~ m 2 g -1 ) A Activation 140 m 2 g -1 Treatment 8 m 2 g -1 Target value: Cork oak Hydrochar 895 m 2 g -1 Activation 482 m 2 g -1 Treatment 279 m 2 g -1 Fossil coal Norit C Gran : 875 m 2 g -1 Poplar Hydrochar 42 m 2 g -1 Activation 222 m 2 g -1 Treatment 11 m 2 g -1 Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 9
10 Conclusion Bark seems to be a interesting feedstock for conversion technologies HTC process and activation was successful, treatment less suitable Repetition of tests and analyses with more adapted methodology for this kind of biomass (currently in progress) Absorption tests (in the pipeline) More realistic tests with a bark mixture or wood chips Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 10
11 Acknowledgments We thank ELLS and the Czech University of Life Science for the opportunity to participate at this conference. Furthermore our thanks go to Dipl-Ing. Dominik Wüst, Dipl-Ing. Olga Sahin and Professor Dr. Andrea Kruse for their supervision. Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 11
12 Source references GOETZ, M. and VOGLHUBER, A., 2014, Herstellung von Aktivkohlen aus hydrothermal karbonisierten Rinden, Projektarbeit, Stuttgart: Universität Hohenheim HEPP, C. and GURK, C., 2014-last update, Baumbestimmung leicht gemacht - Robinie. Available: [05/17, 2014]. LAI, M.Y., Herstellung von Aktivkohle mittels Hydrothermaler Karbonisierung (HTC). Bachelorthesis, Karlsruhe: K.I.T. Karlsruhe KIRSCHHÖFER, F., SAHIN, O., BECKER, G. C., MEFFERT, F., NUSSER, M., ANDERER, G., KUSCHE, S., KLAEUSLI, T., KRUSE, A. and BRENNER-WEISS, G., Wastewater treatment adsorption of organic micropollutants on activated HTC-carbon derived from sewage sludge. Waste Science and Technology. JAIN, A., BALASUBRAMANIAN, R.,SRINIVASAN, M. P., 2015.Hydrothermal conversion of biomass waste to activated carbon with high porosity: A review. Chemical Engineering Journal. Preparation of activated carbon from hydrothermal carbonized bark, November 13 th, 2015, slide 12
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