多层核壳结构Fe@Al-Ti载氧体化学链制氢性能研究  

Chemical looping hydrogen generation with multi-layer core-shell oxygen carrier of Fe@Al-Ti

作　　者：蔡志阳 张俊贤 汪欣 肖慧霞 高云飞 王亦飞[1] CAI Zhiyang;ZHANG Junxian;WANG Xin;XIAO Huixia;GAO Yunfei;WANG Yifei(School of Resources and Environmental Engineering,Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学资源与环境工程学院上海市煤气化工程技术研究中心,上海200237

出　　处：《燃料化学学报（中英文）》2024年第3期353-361,共9页Journal of Fuel Chemistry and Technology

摘　　要：Fe-Al-Ti载氧体在化学链制氢工艺中具有良好的循环稳定性和抗积炭性能,但反应形成FeAl_(2)O_(4)会降低抗烧结性能和氢气产率。为抑制FeAl_(2)O_(4)的生成并进一步提升载氧体反应性能,本研究采用自组装模板燃烧法制备多层核壳结构载氧体,以TiO_(2)为介层阻隔Fe2O3与Al2O3,形成多层核壳Fe@Al-Ti载氧体,在固定床上进行化学链制氢循环,评价多层核壳结构对反应性能的影响。结果表明,Fe@Al-Ti载氧体的介层有效阻隔Fe_(2)O_(3)与Al_(2)O_(3)的接触,抑制了FeAl_(2)O_(4)形成,抗烧结性能得到进一步提升。Fe@Al-Ti载氧体在化学链制氢循环实验中无明显积炭和团聚现象,制氢能力随循环次数逐渐增加,循环稳定性较好;尤其物质的量比Al∶Ti=3.5∶1的核壳载氧体的碳转化率、制氢率和储氧量最高,分别为57.4%、75.0%和6.01 mmol/g,比非核壳Fe-Al-Ti载氧体分别增加28.4%、30.0%、26.9%。Fe-Al-Ti oxygen carriers have good cycling stability and good properties of anti-carbon deposition in the chemical looping hydrogen generation(CLHG)process.However,the formation of FeAl_(2)O_(4)reduces hydrogen yield and increases sintering.To weaken the formation of FeAl_(2)O_(4)and to promote properties,the core-shell oxygen carriers of Fe@Al-Ti were prepared by self-assembly template combustion method,which took TiO_(2)as the inter-layer to separate Fe_(2)O_(3)and Al_(2)O_(3).The effect of multi-layer core-shell structure on reaction performance was evaluated on a fixed bed.The results indicated that the inter-layer of Fe@Al-Ti oxygen carriers effectively weakened the contact between Fe_(2)O_(3)and Al_(2)O_(3),thus reducing the formation of FeAl_(2)O_(4)and improving properties of anti-sintering.The Fe@Al-Ti oxygen carriers significantly prevented carbon deposition and surface agglomeration,and had great cycling stability during the CLHG cycles.The core-shell oxygen carrier with a molar ratio of Al∶Ti=3.5∶1 got the highest carbon conversion rate and H_(2) yield,and oxygen storage capacity in a single cycle,with 57.4%,75.0%,and 6.01 mmol/g,respectively,which were 28.4%,30.0%,and 26.9%higher than those of non core-shell Fe-Al-Ti oxygen carriers.

关 键 词：化学链制氢 Fe_(2)O_(3)/TiO_(2)/Al_(2)O_(3) 核壳结构 固定床 

分 类 号：TQ116.2[化学工程—无机化工]