摘要
用共沉淀法制备Pr Zr4Oy载体,浸渍法制备Ni0.8Fe0.2Cum(Pr Zr4)nOx系列催化剂,并将其用于乙醇水蒸气重整反应(ESR),考察Cu的掺杂量对催化剂性能的影响。通过X射线粉末衍射(XRD)、程序升温还原(TPR)和扫描电子显微镜(SEM)对催化剂的晶体结构、还原特性和表面形态进行表征,结果显示,新鲜催化剂中存在立方晶相Pr6O11、立方晶相Pr2Zr2O7、斜六方晶相Pr Ni O3,在Cu含量较高的催化剂上还出现了单斜晶相Cu O。催化剂经过550℃还原预处理后,Ni、Cu组分均以零价态存在,Fe组分被部分还原为Fe3O4的形式;掺杂Cu组分可提高Ni3+和Fe3+的还原活性。Ni0.8Fe0.2Cu0.2Pr Zr4Ox催化剂在乙醇水蒸气重整反应中表现出较好的性能,在500℃的条件下,乙醇转化率接近100%,一氧化碳摩尔分数低至0.15%;在反应进程中未发现催化剂积碳、烧结和失活现象,催化剂稳定性良好。
PrZr4 Oycomposite oxide support was prepared by co-precipitation method and Ni0.8Fe0.2Cum（Pr Zr4）nOxcatalysts were prepared by impregnation, and the effects of cuprum doping on the activity of catalysts in ethanol steam reforming were studied. The catalysts were characterized by means of X-ray power diffraction（XRD）, temperature programmed reduction（TPR）, and scanning electron microscope（SEM） to study the crystalline phase, reducibility and surface feature.The results showed that cubic phase Pr6O11, cubic phase Pr2Zr2O7 and rhombohedral phase Pr Ni O3 were found in fresh catalyst,and monoclinic phase Cu O could be observed in catalysts with higher Cu loading. After 550 ℃ reduction, Ni3＋ Cu2＋were reduced to Ni0 Cu0, Fe2O3 was partly reduced to Fe3O4.When Cu dropped into the Ni-Fe bimetallic catalysts, reduction activity of Ni3＋ Fe3＋can be improved. Ni0.8Fe0.2Cu0.2（Pr Zr4）nOx catalyst showed high catalytic activity and stability in ethanol steam reforming, with reaction temperature was 500 ℃ the conversion rate of ethanol was nearly 100%, mole percentage of CO was only 0.15%,and carbon deposition, sintering and deactivation phenomenon wasn＇t found in the reaction process.
出处
《可再生能源》
CAS
北大核心
2015年第7期1110-1116,共7页
Renewable Energy Resources
基金
广西自然科学基金项目(桂科自0542018)
关键词
乙醇
制氢
催化剂
镨
铜
ethanol
hydrogen production
catalyst
praseodymium
cuprum
