欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

研究报告

李倩,刘石明,成功,齐方杰,蔡海燕.La_0.5Ca_0.5Ni_0.5Fe_0.5O₃催化剂的制备及其对生物质热解特性的影响[J].环境科学学报,2012,32(8):1827-1832

Synthesis of La_0.5Ca_0.5Ni_0.5Fe_0.5O₃ catalysts and its catalytic performance in the pyrolysis of biomass

摘要：采用共沉淀法制备了La_0.5Ca_0.5Ni_0.5Fe_0.5O₃纳米粉体,并通过XRD、SEM、TG-DTA等手段对所合成的样品进行了分析和表征.结果表明,采用碳酸铵作为共沉淀剂、聚乙二醇为分散剂,在600℃下煅烧6 h可作为实验制备该催化剂粉体的最优条件.用实验室自制热解催化炉验证其对生物质热解的效果,实验结果表明,采用La_0.5Ca_0.5Ni_0.5Fe_0.5O₃催化剂,生物质热解过程中焦油产量降低了12.4%,气体产率提高了14.0%,气体产物中一氧化碳、甲烷含量分别从33.8%和15.1%提高到了38.5%和18.4%,燃气的品质大大提升.

Abstract：La_0.5Ca_0.5Ni_0.5Fe_0.5O₃ (LCNF) nano-catalyst was prepared by co-precipitation method. X-ray diffraction (XRD), scanning electron microscope (SEM), and Thermogravimetric Analysis (TG-DTA) were adopted to characterize the synthesized catalysts. Results shows that calcination at 600℃ for 6h was the suitable conditions for the synthesis of LCNF nano-powders when ammonium carbonate was used as the co-precipitation agent and polyethylene glycol (PEG) as the dispersant. Pyrolysis gas produced from the catalytic pyrolysis of biomass was studied in a fixed bed reactor using LCNF as the catalyst. Compared to the conventional pyrolysis process,the yields of tar reduced by 12.4%, and the yields of gas increased by 14.0%. At the same time, the content of CO in the gas product increased from 33.8% to 38.5% while CH₄ from 15.1% to 18.4%. Therefore, the LCNF shows relatively good tar removal property, which is a promising catalyst in the gasification/prolysis of biomass.