近日，课题组胡强博士的论文“Inert chemical looping conversion of biochar with iron ore as oxygen carrier: Products conversion kinetics and structural evolution”（作者：Qiang Hu, Qiaoting Mao, Xixi Ren, Haiping Yang, Hanping Chen）在《Bioresource Technology》期刊发表。另一论文“Experimental and modeling study of potassium catalyzed gasification of woody char pellet with CO2”（作者：Qiang Hu, Haiping Yang, Zhiqiang Wu, C. Jim Lim, Xiaotao T. Bi, Hanping Chen）被《Energy》期刊接收。
《Bioresource Technology》与《Energy》期刊均是国际工程技术领域的权威期刊，2017至2018年影响因子分别为5.807和4.968，均被中科院JCR分区归于一区Top期刊。在此，对胡强博士表示祝贺，希望他在未来的学习和工作中继续努力，再创佳绩！也祝愿流化床与生物质团队蒸蒸日上，成果多多！
Abstract of Bioresource Technology:
In this study, biochar obtained from pyrolysis of woody shavings at 550 °C was reacted with iron ore in N2 to investigate its inert chemical looping conversion properties, including the gas products conversion kinetics and structural evolution process. Results found that both the release of CO and CO2 could be divided into rapid release stage and stable chemical looping reaction stage with activation energies of 17.69 and 45.65 kJ/mol, respectively. During the chemical looping process, the reaction reactivity of biochar reduced gradually with the amorphous char structure turning into fused ring structure and finally into graphite crystal structure. Simultaneously, Fe2O3 was reduced into Fe3O4, FeO and Fe. This work highlighted the chemical conversion of biochar using natural iron ore as oxygen carrier in inert N2 atmosphere from the common in-situ gasification chemical looping process using CO2/H2O as agent.
Abstract of Energy:
Understanding the catalytic effect of potassium on CO2 gasification of biochar can help clarify the complex catalytic conversion mechanism of biochar. In this study, effects of temperature and KOH content on conversion performance and reaction kinetics of gasification of biochar pellet were investigated by using a macro-thermogravimetric analysis (MTGA) unit. Results showed that the increase of gasification temperature and KOH content promoted the conversion of biochar pellet and enhanced the gasification rate (dX/dt). With the reaction proceeded, dX/dt increased initially then decreased, and reached the peak values at X of about 0.15-0.40. A faster expansion of pore structure at both higher temperature and higher KOH content would contribute to the shift of peak values to lower X. Phase boundary-controlled model fitted well to the gasification of biochar pellet with added KOH at 750 and 800 °C, while the possible melting of K species at 850 °C would change the gasification reaction to phase change model. The inferred catalytic role of K in pellet gasification is that it reduced the activation energy and increased the active sites for carbon to react with CO2, and the activation energy was reduced with the increase in K content (0-20 wt. %).
