Morten Grønli
Norwegian University of Science and Technology
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Publication
Featured researches published by Morten Grønli.
Journal of Agricultural and Food Chemistry | 2014
Alice Budai; Liang Wang; Morten Grønli; Line Tau Strand; Michael Jerry Antal; Samuel Abiven; Alba Dieguez-Alonso; Andrés Anca-Couce; Daniel P. Rasse
Biochar properties vary, and characterization of biochars is necessary for assessing their potential to sequester carbon and improve soil functions. This study aimed at assessing key surface properties of agronomic relevance for products from slow pyrolysis at 250-800 °C, hydrothermal carbonization (HTC), and flash carbonization. The study further aimed at relating surface properties to current characterization indicators. The results suggest that biochar chemical composition can be inferred from volatile matter (VM) and is consistent for corncob and miscanthus feedstocks and for the three tested production methods. High surface area was reached within a narrow temperature range around 600 °C, whereas cation exchange capacity (CEC) peaked at lower temperatures. CEC and pH values of HTC chars differed from those of slow pyrolysis biochars. Neither CEC nor surface area correlated well with VM or atomic ratios. These results suggest that VM and atomic ratios H/C and O/C are good indicators of the degree of carbonization but poor predictors of the agronomic properties of biochar.
European Biomass Conference and Exhibition Proceedings | 2015
Liang Wang; Gábor Várhegyi; Øyvind Skreiberg; Morten Grønli; Michael Jerry Antal
The combustion properties of spruce chars and spruce forest residue chars were studied in the kinetic regime by a series of TGA experiments. The work aimed at establishing how the pressure of the char preparation affects the reactivity with oxygen. In the present phase of the work the pressure during char preparation was employed on a thin layer of biomass with ample ventilation. In this way only negligible pressure effects were observed during char combustion. The kinetics of the char burn-off was described by assuming a main reaction and a side reaction. 12 experiments at three different temperature programs were evaluated by the method of least squares to obtain a dependable kinetic model. A common activation energy of 137kJ/mol gave a reasonable description of both reactions in all the 12 experiments.
European Biomass Conference and Exhibition Proceedings | 2015
Liang Wang; Kathryn Hu; Charissa Higashi; Øyvind Skreiberg; Viktor Myrvågnes; Morten Grønli; Michael Jerry Antal; Gábor Várhegyi
In this work, effects of storage time and conditions on the properties of one woody charcoal were studied. Analyses results showed that the volatile matter content of the charcoal samples collected from the bottom section of containers changed significantly more than those collected from the top section. Compared to small size charcoal samples, a higher increase in volatile matter content was detected in large size charcoal samples, and increasing with increasing storage time. The fixed carbon content of all charcoal samples changed along the storage time. Results from this work suggest that long storage/transportation time at unfavorable conditions should be avoided, in order to maintain the as loaded charcoal properties during long-term transport and storage.
Industrial & Engineering Chemistry Research | 2003
Michael Jerry Antal; Morten Grønli
Fuel | 2005
Judit Adam; Marianne Blazsó; Erika Mészáros; Michael Stöcker; Merete Hellner Nilsen; Aud M. Bouzga; Johan E. Hustad; Morten Grønli; Gisle Øye
Energy & Fuels | 2000
Morten Grønli; Morten C. Melaaen
Industrial & Engineering Chemistry Research | 2000
Michael Jerry Antal; Stephen Glen Allen; Xiangfeng Dai; T. Brent Shimizu; Man S. Tam; Morten Grønli
Energy Procedia | 2012
Liang Wang; Johan E. Hustad; Øyvind Skreiberg; Geir Skjevrak; Morten Grønli
Energy & Fuels | 2012
Dhruv Tapasvi; Roger A. Khalil; Øyvind Skreiberg; Khanh-Quang Tran; Morten Grønli
Energy & Fuels | 2009
Roger Khalil; Gábor Várhegyi; Susanne Jäschke; Morten Grønli; Johan E. Hustad