{"title":"Microwave-assisted pyrolysis of biomass: Influence of feedstock and pyrolysis parameters on porous biochar properties","authors":"Tianhao Qiu, Chengxiang Li, Wenke Zhao, Muhammad Yasin Naz, Yaning Zhang","doi":"10.1016/j.biombioe.2024.107583","DOIUrl":null,"url":null,"abstract":"Pyrolysis of biomass produces syngas, bio-oil and biochar, among which biochar requires low pyrolysis temperature and it usually has good adsorption ability due to its complex porous structures. In this study, microwave-assisted pyrolysis of different kinds of biomass such as rice husk, peanut shell, and corn straw to produce biochar was investigated. The yields, specific surface areas (SSA), average pore diameters, and total pore volumes of biochars produced at different pyrolysis temperatures (700, 750, 800, 850, and 900 °C), microwave powers (400, 450, 500, 550, and 600 W), and residence times (60, 90, 120, 150, and 180 min) were detailed. The biochar yields ranged in 30.76–43.28 wt%, 25.71–38.93 wt%, and 23.71–36.95 wt% for peanut shell, rice husk, and corn straw, respectively. With increase in pyrolysis temperature, microwave power or/and residence time, the yield of biochar decreased gradually and eventually became stable, while the SSA of 4.68–323.33 m<ce:sup loc=\"post\">2</ce:sup>/g and total pore volume of 0.0085–0.2015 cc/g rose monotonously, and the average pore size of 2.19–16.55 nm decreased monotonously. The maximum SSA of 323.33 m<ce:sup loc=\"post\">2</ce:sup>/g occurred at 900 °C, 500 W, and 120 min for corn straw. The proposed correlations for biochar pore structures and pyrolysis conditions will provide guidance for porous biochar production from biomass. Porous biochar can be widely used in soil remediation, environmental pollution control, high-performance catalyst/adsorbent research and development, etc. The accurate preparation of biochar with appropriate pore structure is of great significance to promote the efficient recovery and utilization of biomass resources.","PeriodicalId":253,"journal":{"name":"Biomass & Bioenergy","volume":"255 1","pages":""},"PeriodicalIF":5.8000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Biomass & Bioenergy","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.biombioe.2024.107583","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Pyrolysis of biomass produces syngas, bio-oil and biochar, among which biochar requires low pyrolysis temperature and it usually has good adsorption ability due to its complex porous structures. In this study, microwave-assisted pyrolysis of different kinds of biomass such as rice husk, peanut shell, and corn straw to produce biochar was investigated. The yields, specific surface areas (SSA), average pore diameters, and total pore volumes of biochars produced at different pyrolysis temperatures (700, 750, 800, 850, and 900 °C), microwave powers (400, 450, 500, 550, and 600 W), and residence times (60, 90, 120, 150, and 180 min) were detailed. The biochar yields ranged in 30.76–43.28 wt%, 25.71–38.93 wt%, and 23.71–36.95 wt% for peanut shell, rice husk, and corn straw, respectively. With increase in pyrolysis temperature, microwave power or/and residence time, the yield of biochar decreased gradually and eventually became stable, while the SSA of 4.68–323.33 m2/g and total pore volume of 0.0085–0.2015 cc/g rose monotonously, and the average pore size of 2.19–16.55 nm decreased monotonously. The maximum SSA of 323.33 m2/g occurred at 900 °C, 500 W, and 120 min for corn straw. The proposed correlations for biochar pore structures and pyrolysis conditions will provide guidance for porous biochar production from biomass. Porous biochar can be widely used in soil remediation, environmental pollution control, high-performance catalyst/adsorbent research and development, etc. The accurate preparation of biochar with appropriate pore structure is of great significance to promote the efficient recovery and utilization of biomass resources.
期刊介绍:
Biomass & Bioenergy is an international journal publishing original research papers and short communications, review articles and case studies on biological resources, chemical and biological processes, and biomass products for new renewable sources of energy and materials.
The scope of the journal extends to the environmental, management and economic aspects of biomass and bioenergy.
Key areas covered by the journal:
• Biomass: sources, energy crop production processes, genetic improvements, composition. Please note that research on these biomass subjects must be linked directly to bioenergy generation.
• Biological Residues: residues/rests from agricultural production, forestry and plantations (palm, sugar etc), processing industries, and municipal sources (MSW). Papers on the use of biomass residues through innovative processes/technological novelty and/or consideration of feedstock/system sustainability (or unsustainability) are welcomed. However waste treatment processes and pollution control or mitigation which are only tangentially related to bioenergy are not in the scope of the journal, as they are more suited to publications in the environmental arena. Papers that describe conventional waste streams (ie well described in existing literature) that do not empirically address ''new'' added value from the process are not suitable for submission to the journal.
• Bioenergy Processes: fermentations, thermochemical conversions, liquid and gaseous fuels, and petrochemical substitutes
• Bioenergy Utilization: direct combustion, gasification, electricity production, chemical processes, and by-product remediation
• Biomass and the Environment: carbon cycle, the net energy efficiency of bioenergy systems, assessment of sustainability, and biodiversity issues.