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Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar

Tutkimustuotosvertaisarvioitu

Standard

Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar. / Hyväluoma, Jari; Hannula, Markus; Arstila, Kai; Wang, Hailong; Kulju, Sampo; Rasa, Kimmo.

julkaisussa: Journal of Analytical and Applied Pyrolysis, Vuosikerta 134, 09.2018.

Tutkimustuotosvertaisarvioitu

Harvard

Hyväluoma, J, Hannula, M, Arstila, K, Wang, H, Kulju, S & Rasa, K 2018, 'Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar', Journal of Analytical and Applied Pyrolysis, Vuosikerta. 134. https://doi.org/10.1016/j.jaap.2018.07.011

APA

Hyväluoma, J., Hannula, M., Arstila, K., Wang, H., Kulju, S., & Rasa, K. (2018). Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar. Journal of Analytical and Applied Pyrolysis, 134. https://doi.org/10.1016/j.jaap.2018.07.011

Vancouver

Hyväluoma J, Hannula M, Arstila K, Wang H, Kulju S, Rasa K. Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar. Journal of Analytical and Applied Pyrolysis. 2018 syys;134. https://doi.org/10.1016/j.jaap.2018.07.011

Author

Hyväluoma, Jari ; Hannula, Markus ; Arstila, Kai ; Wang, Hailong ; Kulju, Sampo ; Rasa, Kimmo. / Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar. Julkaisussa: Journal of Analytical and Applied Pyrolysis. 2018 ; Vuosikerta 134.

Bibtex - Lataa

@article{517fc981e4634d578ad1d84158de62fd,
title = "Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar",
abstract = "Biochar pore space consists of porosity of multiple length scales. In direct water holding applications like water storage for plant water uptake, the main interest is in micrometre-range porosity since these pores are able to store water that is easily available for plants. Gas adsorption measurements which are commonly used to characterize the physical pore structure of biochars are not able to quantify this pore-size range. While pyrogenetic porosity (i.e. pores formed during pyrolysis process) tends to increase with elevated process temperature, it is uncertain whether this change affects the pore space capable to store plant available water. In this study, we characterized biochar porosity with x-ray tomography which provides quantitative information on the micrometer-range porosity. We imaged willow dried at 60 °C and biochar samples pyrolysed in three different temperatures (peak temperatures 308, 384, 489 °C, heating rate 2 °C min−1). Samples were carefully prepared and traced through the experiments, which allowed investigation of porosity development in micrometre size range. Pore space was quantified with image analysis of x-ray tomography images and, in addition, nanoscale porosity was examined with helium ion microscopy. The image analysis results show that initial pore structure of the raw material determines the properties of micrometre-range porosity in the studied temperature range. Thus, considering the pore-size regime relevant to the storage of plant available water, pyrolysis temperature in the studied range does not provide means to optimize the biochar structure. However, these findings do not rule out that process temperature may affect the water retention properties of biochars by modifying the chemical properties of the pore surfaces.",
keywords = "Biochar, Image analysis, Porosity, Slow pyrolysis, X-ray tomography",
author = "Jari Hyv{\"a}luoma and Markus Hannula and Kai Arstila and Hailong Wang and Sampo Kulju and Kimmo Rasa",
note = "EXT={"}Kulju, Sampo{"}",
year = "2018",
month = "9",
doi = "10.1016/j.jaap.2018.07.011",
language = "English",
volume = "134",
journal = "Journal of Analytical and Applied Pyrolysis",
issn = "0165-2370",
publisher = "Elsevier",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Effects of pyrolysis temperature on the hydrologically relevant porosity of willow biochar

AU - Hyväluoma, Jari

AU - Hannula, Markus

AU - Arstila, Kai

AU - Wang, Hailong

AU - Kulju, Sampo

AU - Rasa, Kimmo

N1 - EXT="Kulju, Sampo"

PY - 2018/9

Y1 - 2018/9

N2 - Biochar pore space consists of porosity of multiple length scales. In direct water holding applications like water storage for plant water uptake, the main interest is in micrometre-range porosity since these pores are able to store water that is easily available for plants. Gas adsorption measurements which are commonly used to characterize the physical pore structure of biochars are not able to quantify this pore-size range. While pyrogenetic porosity (i.e. pores formed during pyrolysis process) tends to increase with elevated process temperature, it is uncertain whether this change affects the pore space capable to store plant available water. In this study, we characterized biochar porosity with x-ray tomography which provides quantitative information on the micrometer-range porosity. We imaged willow dried at 60 °C and biochar samples pyrolysed in three different temperatures (peak temperatures 308, 384, 489 °C, heating rate 2 °C min−1). Samples were carefully prepared and traced through the experiments, which allowed investigation of porosity development in micrometre size range. Pore space was quantified with image analysis of x-ray tomography images and, in addition, nanoscale porosity was examined with helium ion microscopy. The image analysis results show that initial pore structure of the raw material determines the properties of micrometre-range porosity in the studied temperature range. Thus, considering the pore-size regime relevant to the storage of plant available water, pyrolysis temperature in the studied range does not provide means to optimize the biochar structure. However, these findings do not rule out that process temperature may affect the water retention properties of biochars by modifying the chemical properties of the pore surfaces.

AB - Biochar pore space consists of porosity of multiple length scales. In direct water holding applications like water storage for plant water uptake, the main interest is in micrometre-range porosity since these pores are able to store water that is easily available for plants. Gas adsorption measurements which are commonly used to characterize the physical pore structure of biochars are not able to quantify this pore-size range. While pyrogenetic porosity (i.e. pores formed during pyrolysis process) tends to increase with elevated process temperature, it is uncertain whether this change affects the pore space capable to store plant available water. In this study, we characterized biochar porosity with x-ray tomography which provides quantitative information on the micrometer-range porosity. We imaged willow dried at 60 °C and biochar samples pyrolysed in three different temperatures (peak temperatures 308, 384, 489 °C, heating rate 2 °C min−1). Samples were carefully prepared and traced through the experiments, which allowed investigation of porosity development in micrometre size range. Pore space was quantified with image analysis of x-ray tomography images and, in addition, nanoscale porosity was examined with helium ion microscopy. The image analysis results show that initial pore structure of the raw material determines the properties of micrometre-range porosity in the studied temperature range. Thus, considering the pore-size regime relevant to the storage of plant available water, pyrolysis temperature in the studied range does not provide means to optimize the biochar structure. However, these findings do not rule out that process temperature may affect the water retention properties of biochars by modifying the chemical properties of the pore surfaces.

KW - Biochar

KW - Image analysis

KW - Porosity

KW - Slow pyrolysis

KW - X-ray tomography

U2 - 10.1016/j.jaap.2018.07.011

DO - 10.1016/j.jaap.2018.07.011

M3 - Article

VL - 134

JO - Journal of Analytical and Applied Pyrolysis

JF - Journal of Analytical and Applied Pyrolysis

SN - 0165-2370

ER -