摘要
采用溶胶-凝胶法制备不同助剂掺杂改性的ZnFe_(2)O_(4)氧载体,探究不同助剂(Sr、Ce、La和Al)对其性能的影响。化学链制氢实验在固定床反应器中进行,结果表明:添加助剂能有效提高氧载体的性能,单位质量氧载体H_(2)产量从高到低依次为La>Sr>Al>Ce,La改性的ZnFe_(2)O_(4)氧载体反应活性最高。结合X射线衍射、H_(2)-程序升温还原、吸附比表面测试法等表征手段和化学链制氢实验对掺杂助剂La的氧载体物理化学性质作进一步分析,考察不同掺杂质量分数对氧载体反应性能的影响。结果表明:添加质量分数为12%La助剂的ZnFe_(2)O_(4)在化学链制氢反应中单位H_(2)产量最高;La助剂的加入提高了氧载体的比表面积,促进氧空位的形成,加快晶格氧的迁移速率,有利于化学链制氢反应。
ZnFe_(2)O_(4)oxygen carrier(OC)doped with different additives(Sr,Ce,La and Al)was prepared by sol-gel method to investigate the influence of different additives on performance of the ZnFe_(2)O_(4)oxygen carrier.Chemical looping hydrogen generation(CLHG)experiments were carried out in a fixed bed reactor.It was found that the performance of ZnFe_(2)O_(4)was greatly improved by doping different metals,and the hydrogen production of per unit mass OC from high to low is La>Sr>Al>Ce.The physicochemical properties of different amount of La-doped ZnFe_(2)O_(4)were further analyzed by combining X-ray diffraction,H_(2)-temperature-programmed reduction,Brunauer-Em-mett-Teller method and other characterization methods.The data indicated that the ZnFe_(2)O_(4)modified by La with 12%mass fraction has the highest reaction activity.La dropping can increase the specific surface area of the OC,reduce the reduction temperature,increase the migration rate of lattice oxygen,promote the formation of oxygen vacancies,and is beneficial to the increase in hydrogen production in the chemical looping process.
作者
宋维锋
武景丽
孙德帅
王志奇
吴晋沪
SONG Weifeng;WU Jingli;SUN Deshuai;WANG Zhiqi;WU Jinhu(College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266101,China;Key Laboratory of Biofuels,Qingdao Institute of Bioenergy and Bioprocess Technology,Chinese Academy of Sciences,Qingdao 266101,China)
出处
《热力发电》
CAS
CSCD
北大核心
2024年第5期19-27,共9页
Thermal Power Generation
基金
国家自然科学基金项目(22108287)
山东省自然科学基金面上项目(ZR2020MB138)。
关键词
化学链
制氢
氧载体
助剂
chemical looping
hydrogen generation
oxygen carrier
additives
