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Influence of pressure and temperature on key physicochemical properties of corn stover-derived biochar
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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Number of Authors: 5
2016 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 186, 525-533 p.Article in journal (Refereed) Published
Abstract [en]

This study focuses on analyzing the effect of both the peak temperature and pressure on the properties of biochar produced through slow pyrolysis of corn stover, which is a common agricultural waste that currently has little or no value. The pyrolysis experiments were carried out in a fixed-bed reactor at different peak temperatures (400, 525 and 650 degrees C) and absolute pressures (0.1, 0.85 and 1.6 MPa). The inert mass flow rate (at NTP conditions) was adjusted in each test to keep the gas residence time constant within the reactor. The as-received corn stover was pyrolyzed into a biochar without any physical pre-treatment as a way to reduce the operating costs. The properties of biochars showed that high peak temperature led to high fixed-carbon contents, high aromaticity and low molar H:C and O:C ratios; whereas a high pressure only resulted in a further decrease in the O:C ratio and a further increase in the fixed-carbon content. Increasing the operating pressure also resulted in a higher production of pyrolysis gas at the expense of water formation.

Place, publisher, year, edition, pages
2016. Vol. 186, 525-533 p.
Keyword [en]
Corn stover, Pyrolysis, Biochar, Aromatic carbon, Pressure
National Category
Chemical Sciences Environmental Engineering
Identifiers
URN: urn:nbn:se:su:diva-136246DOI: 10.1016/j.fuel.2016.08.088ISI: 000385318600053OAI: oai:DiVA.org:su-136246DiVA: diva2:1053154
Available from: 2016-12-08 Created: 2016-12-01 Last updated: 2016-12-08Bibliographically approved

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