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| Influence of inherent minerals on biomass pyrolysis and carbon stability in biochar |
| Received:September 08, 2016 |
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| KeyWord:biomass;inherent minerals;pyrolysis;carbon retention;catalytic effect;carbon stability |
| Author Name | Affiliation | E-mail | | GU Bo-wen | School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | | CAO Xin-de | School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | | | ZHAO Ling | School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | wszhaoling@sjtu.edu.cn | | ZHAO Ying-hao | School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China | |
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| Abstract: |
| In this study, two common biomass residues, peanut shell and cow manure were selected to investigate these influences. The experiments were conducted including removing the inherent minerals through acid washing for biochar formation, adding typical minerals into demineralized biomass for biochar generation, and the resulted bichars were characterized by thermogravimetric analysis, elemental analysis, chemical oxidation, and Raman spectroscopy. Results show that the main inherent mineral in peanut shell and cow manure biomasses was KCl and CaCl2, respectively and they had a significant catalytic effect on the biomass pyrolysis by decreasing the decomposition temperature of carbon from 250~400℃ to 200~350℃. CaCl2 showed a larger catalytic effect on the biomass pyrolysis than KCl. No obvious changes were observed on carbon retention(%) during biomass pyrolysis with mineral removal or addition, while in the absence of mineral the stability of peanut shell and cow manure biochar was increased by 52.7% and 30.6%, respectively, indicated by oxidation of K2Cr2O7. Minerals promoted the lack of lattice in biochar(increased ID/IG), resulting in the reduced carbon stability. Overall, inherent minerals in biomass had catalytic effect on the decomposition of carbon skeleton during pyrolysis, and they made the carbon structure disordering, reducing the stability of its carbon. |
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