Steam Gasification of Sawdust Biochar Influenced by Chemical Speciation of Alkali and Alkaline Earth Metallic Species

Dongdong Feng, Yijun Zhao, Yu Zhang, Shaozeng Sun and Jianmin Gao
Additional contact information
Dongdong Feng: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yijun Zhao: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yu Zhang: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Shaozeng Sun: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jianmin Gao: School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2018, vol. 11, issue 1, 1-16

Abstract: The effect of chemical speciation (H 2 O/NH 4 Ac/HCl-soluble and insoluble) of alkali and alkaline earth metallic species on the steam gasification of sawdust biochar was investigated in a lab-scale, fixed-bed reactor, with the method of chemical fractionation analysis. The changes in biochar structures and the evolution of biochar reactivity are discussed, with a focus on the contributions of the chemical speciation of alkali and alkaline earth metallic species (AAEMs) on the steam gasification of biochar. The results indicate that H 2 O/NH 4 Ac/HCl-soluble AAEMs have a significant effect on biochar gasification rates. The release of K occurs mainly in the form of inorganic salts and hydrated ions, while that of Ca occurs mainly as organic ones. The sp 3 -rich or sp 2 -sp 3 structures and different chemical-speciation AAEMs function together as the preferred active sites during steam gasification. H 2 O/HCl-soluble AAEMs could promote the transformation of biochar surface functional groups, from ether/alkene C-O-C to carboxylate COO ? in biochar, while they may both be improved by NH 4 Ac-soluble AAEMs. H 2 O-soluble AAEMs play a crucial catalytic role in biochar reactivity. The effect of NH 4 Ac-soluble AAEMs is mainly concentrated in the high-conversion stage (biochar conversion >30%), while that of HCl-soluble AAEMs is reflected in the whole activity-testing stage.

Keywords: biochar; steam; gasification; chemical speciation; AAEMs (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

Downloads: (external link)
https://www.mdpi.com/1996-1073/11/1/205/pdf (application/pdf)
https://www.mdpi.com/1996-1073/11/1/205/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:11:y:2018:i:1:p:205-:d:127020

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().