Biochar from microwave pyrolysis of biomass: A review |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC V6T 1Z3, Canada;2. Agricultural Engineering Department, Cairo University, Giza, Egypt;3. Clean Energy Research Center, Korea Institute of Science and Technology, 14 gil 5 Hwarang-no Seongbuk-gu, Seoul 136-791, Republic of Korea;1. School of Energy Science and Engineering, Harbin Institute of Technology (HIT), 92 West Dazhi Street, Harbin, Heilongjiang 150001, China;2. Center for Biorefining, and Department of Bioproducts and Biosystems Engineering, 1390 Eckles Ave., St. Paul, MN 55108, USA;3. Ministry of Education Engineering Research Center for Biomass Conversion, Nanchang University, 235 Nanjing Road, Nanchang City, Jiangxi 330047, China;4. Yunnan Minzu University, Kunming, Yunnan 650500, China;5. Department of Biological Systems Engineering, Washington State University, 2710 Crimson Way, Richland, WA 99354, USA;1. Graduate Institute of Environmental Engineering, National Taiwan University, 71, Chou-Shan Rd., Taipei 106, Taiwan, ROC;2. Department of Safety, Health and Environmental Engineering, Ming Chi University of Technology, 84, Gong-Juan Rd., Taishan, New Taipei City 243, Taiwan, ROC;1. School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China;2. College of Chemical Engineering, Nanjing Forestry University, Nanjing, Jiangsu Province 210037, PR China;3. Bioproducts, Sciences and Engineering Laboratory, Department of Biological Systems Engineering, Washington State University, Richland, WA 99354-1671, USA;4. Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA;1. Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, United States;2. GIMSCOP and Department of Chemical Engineering, Federal University of Rio Grande do Sul, Rua Engenheiro Luiz Englert, Prédio 12204, 90040-040 Porto Alegre, RS, Brazil;3. MOE Biomass Engineering Research Center, Nanchang University, Nanchang, Jiangxi 370047, PR China;4. College of Biological Science and Technology, Fuzhou University, Fuzhou 350108, PR China |
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| Abstract: | Microwave based technology is an alternative heating method and has already been successfully used in biomass pyrolysis for biochar and biofuel production thanks to its fast, volumetric, selective and efficient heating. Previous review mainly focused on production and analysis of bio-oil and gas instead of biochar. The current paper provides a review of microwave-assisted pyrolysis (MWP) of biomass and its biochar characteristics, including product distribution and biochar yield, biochar properties, microwave absorbers (MWAs) and catalysts commonly used in MWP, as well as comparison of biochar derived from MWP and conventional pyrolysis (CP). MWAs not only absorb microwave energy, they also act as catalysts to interact with gas, vapor and solids in the reactor, adjusting the product distribution and quality of products. It was reported for MWP that the highest biochar yield was >60 wt% and the maximum BET surface area was about 450–800 m2/g. Technology status and economics of MWP of biomass in China were briefly introduced. The Optimization of yield and quality of biochar strongly depends on feedstock properties, reactor types, operating parameters, MWAs and catalysts added to the system. |
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| Keywords: | Microwave Pyrolysis Biochar Biomass |
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