Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Optimization of pyrolysis conditions for char production from rice husks and its characterization as a precursor for production of activated carbon
Department of Mechanical Engineering, Makerere University, Uganda.
Department of Mechanical Engineering, Makerere University, Uganda.
Thünen Institute of Agricultural Technology, Braunschweig, Germany.
Department of Mechanical Engineering, Makerere University, Uganda.
Show others and affiliations
2019 (English)In: Biomass Conversion and Biorefinery, ISSN 2190-6815, E-ISSN 2190-6823, p. 1-16Article in journal (Refereed) Published
Abstract [en]

Response surface methodology was employed to optimize pyrolysis conditions for production of char with maximumyield, fixedcarbon content, and with minimum ash content from Uganda’s New Rice for Africa (NERICA) 1 rice husk variety. The aim wasto obtain rice husk char with more suitable properties as an activated carbon precursor. Mathematical models were developed toexplain the relationships between the experimental responses and the pyrolysis parameters of temperature (400–600 °C), heating rate (10–25 °C min−1), and heating period (60–120 min). The optimized rice husk char was further characterized for elementaland proximate compositions, thermal behavior, specific surface area, as well as surface functional groups. Results from theanalysis of variance (ANOVA) revealed that the quadratic model best fits each of the responses. Pyrolysis temperature had thegreatest influence on each of the responses, followed by heating period, and lastly heating rate. Optimum pyrolysis conditionswere found to be temperature (406 °C), heating rate (10 °C min−1), and heating period (60 min), resulting in char yield, fixedcarbon, and ash contents of 35.26, 55.39, and 35.01% dry basis, respectively. Compared to raw rice husk, the resulting rice huskchar was found more suited as activated carbon precursor, due to its enriched carbon content (60.35%) and specific surface area (123.9 m2 g−1). Thermogravimetric analysis of the rice husk char revealed that thermal activation temperatures higher than 400 °C may be required to considerably devolatilize the char, forming a more porous activated carbon.

Place, publisher, year, edition, pages
Springer, 2019. p. 1-16
Keywords [en]
NERICA 1 rice husk, Pyrolysis, Optimization, Char Yield, Fixed carbon, Ash content
National Category
Engineering and Technology
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-251382DOI: 10.1007/s13399-019-00399-0Scopus ID: 2-s2.0-85065119281OAI: oai:DiVA.org:kth-251382DiVA, id: diva2:1315294
Note

QC 20190514

Available from: 2019-05-13 Created: 2019-05-13 Last updated: 2019-05-14Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Kiros, Yohannes
By organisation
Chemical Engineering
In the same journal
Biomass Conversion and Biorefinery
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 17 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf