摘要
采用浸渍、热分解和氢还原等步骤制备了两种纳米晶载体催化剂Ni/Al2 O3 和Ni/La2 O3 ,应用X射线衍射、X射线光电子能谱、N2 吸附和扫描电镜对催化剂的体相和表面结构进行了测定 ,采用固定床反应器考察了催化剂对乙醇水蒸气重整制氢反应的催化性能 .实验结果表明 ,1 5 3%Ni/La2 O3 催化剂对乙醇的低温水蒸气重整反应表现出较高的催化活性和稳定性 .2 5 0℃时乙醇的转化率已达到 80 7% ,氢气的选择性为 4 9 5 % ;330℃时乙醇的转化率达到 1 0 0 % ,氢气的选择性可达5 4 3% .1 6 1 %Ni/Al2 O3
Hydrogen production from ethanol steam reforming over nanocrystalline catalysts Ni/Al 2O 3 and Ni/La 2O 3 prepared by impregnation, thermal decomposition and hydrogen reduction was investigated. The structure and surface characteristics of the catalysts were measured by XPS, XRD, N 2 adsorption and SEM methods. The catalytic properties of the catalysts were tested in a fixed bed reactor fitted in a programmable oven. The 15 3%Ni/La 2O 3 catalyst exhibits high activity for the ethanol steam reforming with ethanol conversion of 80 7%～100% and hydrogen selectivity of 49 5%～54 3% in the temperature range of 250～330 ℃. However, the 16 1%Ni/Al 2O 3 catalyst shows relatively low activity for the ethanol steam reforming, the highest ethanol conversion is only 86 4% and the highest selectivity for hydrogen is 47 7% at 300 ℃. The initial stability of the catalysts was tested at 320 ℃ for 60 h. The results indicate that the Ni/La 2O 3 catalyst can promote the ethanol steam reforming at low temperature and is a potential candidate for the ethanol reforming process.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2004年第7期551-555,共5页
基金
国家重点基础研究发展规划 ( 973计划 )资助项目 ( 2 0 0 2CB2 1180 3 )
关键词
镍
氧化铝
氧化镧
负载型催化剂
乙醇
水蒸气
重整
制氢
nickel, alumina, lanthanum oxide, supported catalyst, ethanol, steam, reforming, hydrogen production
