Formation and evolution mechanism of persistent free radicals in biochar during biomass pyrolysis: Insights from biochar’s element composition and chemical structure
[Display omitted] •Formation and evolution process of PFRs during biomass pyrolysis was investigated.•Effect of biomass property and pyrolysis temperature on the PFRs was clarified.•Relationships between PFRs characteristics and chemical structure were established.•Three-stage evolution mechanism of...
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| Vydané v: | Fuel (Guildford) Ročník 357; s. 129910 |
|---|---|
| Hlavní autori: | , , , , , , , , , , |
| Médium: | Journal Article |
| Jazyk: | English |
| Vydavateľské údaje: |
Elsevier Ltd
01.02.2024
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| Predmet: | |
| ISSN: | 0016-2361, 1873-7153 |
| On-line prístup: | Získať plný text |
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| Abstract | [Display omitted]
•Formation and evolution process of PFRs during biomass pyrolysis was investigated.•Effect of biomass property and pyrolysis temperature on the PFRs was clarified.•Relationships between PFRs characteristics and chemical structure were established.•Three-stage evolution mechanism of PFRs in biochar during pyrolysis was revealed.
The persistent free radicals (PFRs) in biochar can play a crucial role during biochar’s utilization, but the formation and evolution mechanism of PFRs in biochar are poorly understood because of biochars’ element specificity and chemical structure complexity. In order to further understand the formation and evolution mechanism of PFRs, the PFRs characteristics, chemical structure and element composition of six types of biomasses were investigated. The results revealed that the changing trend of the PFRs types, concentration and line width with pyrolysis temperature is similar for all six feedstocks. The difference in the feedstocks’ properties just affects the absolute value of PFRs’ characteristic parameters. The arrangement and combination of elements and carbon skeleton structure in biochar determine the evolution of PFRs in the pyrolysis process. Additionally, the (H + O)/C atomic ratio of the biomass feedstock and the content of substitutional groups on aromatic rings were found to influence the types of PFRs in biochar. When biochar has a similar O/C atom ratio, a higher H content can reduce the carbon-centered PFRs in biochar. Besides, the reduction in O element content contributes to a decrease in line width due to the reduction in the effect of heteroatoms. The good correlation between O/C atomic ratio, H/C atomic ratio, chemical structure and PFRs characteristics can be used to predict the PFRs characteristics. Combining the changing characteristics in PFRs concentration and carbon skeleton structure of biochar, a three-stage model of PFRs formation and evolution was constructed. |
|---|---|
| AbstractList | [Display omitted]
•Formation and evolution process of PFRs during biomass pyrolysis was investigated.•Effect of biomass property and pyrolysis temperature on the PFRs was clarified.•Relationships between PFRs characteristics and chemical structure were established.•Three-stage evolution mechanism of PFRs in biochar during pyrolysis was revealed.
The persistent free radicals (PFRs) in biochar can play a crucial role during biochar’s utilization, but the formation and evolution mechanism of PFRs in biochar are poorly understood because of biochars’ element specificity and chemical structure complexity. In order to further understand the formation and evolution mechanism of PFRs, the PFRs characteristics, chemical structure and element composition of six types of biomasses were investigated. The results revealed that the changing trend of the PFRs types, concentration and line width with pyrolysis temperature is similar for all six feedstocks. The difference in the feedstocks’ properties just affects the absolute value of PFRs’ characteristic parameters. The arrangement and combination of elements and carbon skeleton structure in biochar determine the evolution of PFRs in the pyrolysis process. Additionally, the (H + O)/C atomic ratio of the biomass feedstock and the content of substitutional groups on aromatic rings were found to influence the types of PFRs in biochar. When biochar has a similar O/C atom ratio, a higher H content can reduce the carbon-centered PFRs in biochar. Besides, the reduction in O element content contributes to a decrease in line width due to the reduction in the effect of heteroatoms. The good correlation between O/C atomic ratio, H/C atomic ratio, chemical structure and PFRs characteristics can be used to predict the PFRs characteristics. Combining the changing characteristics in PFRs concentration and carbon skeleton structure of biochar, a three-stage model of PFRs formation and evolution was constructed. |
| ArticleNumber | 129910 |
| Author | Wang, Yi Ren, Qiangqiang Jiang, Long Fang, Zhou Chen, Dezhi Xu, Jun Xu, Kai Ling, Peng Xiang, Jun Su, Sheng Hu, Song |
| Author_xml | – sequence: 1 givenname: Dezhi surname: Chen fullname: Chen, Dezhi organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 2 givenname: Jun surname: Xu fullname: Xu, Jun email: xujun_sklcc@hust.edu.cn organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 3 givenname: Peng surname: Ling fullname: Ling, Peng organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 4 givenname: Zhou surname: Fang fullname: Fang, Zhou organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 5 givenname: Qiangqiang surname: Ren fullname: Ren, Qiangqiang organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 6 givenname: Kai surname: Xu fullname: Xu, Kai organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 7 givenname: Long surname: Jiang fullname: Jiang, Long organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 8 givenname: Yi orcidid: 0000-0002-8023-2586 surname: Wang fullname: Wang, Yi email: alenwang@hust.edu.cn organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 9 givenname: Sheng surname: Su fullname: Su, Sheng organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 10 givenname: Song surname: Hu fullname: Hu, Song organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China – sequence: 11 givenname: Jun surname: Xiang fullname: Xiang, Jun organization: State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, China |
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•Formation and evolution process of PFRs during biomass pyrolysis was investigated.•Effect of biomass property and pyrolysis temperature on... |
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| Title | Formation and evolution mechanism of persistent free radicals in biochar during biomass pyrolysis: Insights from biochar’s element composition and chemical structure |
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