Rafiq Muhammad Khalid, Bachmann Robert Thomas, Rafiq Muhammad Tariq, Shang Zhanhuan, Joseph Stephen, Long Ruijun
College of Pastoral Agriculture, Science and Technology Agric, Lanzhou University, 222 Tianshui South Road, Lanzhou.730000, PR China.
Directorate of Range Mgt and Forestry, Pakistan Agricultural Research Council, Islamabad, 44000, Pakistan.
PLoS One. 2016 Jun 21;11(6):e0156894. doi: 10.1371/journal.pone.0156894. eCollection 2016.
This study examined the influence of pyrolysis temperature on biochar characteristics and evaluated its suitability for carbon capture and energy production. Biochar was produced from corn stover using slow pyrolysis at 300, 400 and 500°C and 2 hrs holding time. The experimental biochars were characterized by elemental analysis, BET, FTIR, TGA/DTA, NMR (C-13). Higher heating value (HHV) of feedstock and biochars was measured using bomb calorimeter. Results show that carbon content of corn stover biochar increased from 45.5% to 64.5%, with increasing pyrolysis temperatures. A decrease in H:C and O:C ratios as well as volatile matter, coupled with increase in the concentration of aromatic carbon in the biochar as determined by FTIR and NMR (C-13) demonstrates a higher biochar carbon stability at 500°C. It was estimated that corn stover pyrolysed at 500°C could provide of 10.12 MJ/kg thermal energy. Pyrolysis is therefore a potential technology with its carbon-negative, energy positive and soil amendment benefits thus creating win- win scenario.
本研究考察了热解温度对生物炭特性的影响，并评估了其用于碳捕获和能源生产的适用性。采用慢速热解在300、400和500℃下保持2小时，由玉米秸秆制备生物炭。通过元素分析、BET、FTIR、TGA/DTA、NMR（C-13）对实验生物炭进行表征。使用弹式量热计测量原料和生物炭的高热值（HHV）。结果表明，随着热解温度升高，玉米秸秆生物炭的碳含量从45.5%增加到64.5%。FTIR和NMR（C-13）测定结果显示，生物炭中H:C和O:C比值以及挥发性物质减少，同时芳香碳浓度增加，表明在500℃时生物炭具有更高的碳稳定性。据估计，在500℃下热解的玉米秸秆可提供10.12 MJ/kg的热能。因此，热解是一项具有潜力的技术，具有负碳、能源正向和土壤改良的优势，从而创造双赢局面。
