摘要
利用浸渍法制备了担载于γ-Al2O3上的Ni-Cr/MgAl2O4尖晶石催化剂,考察了催化剂对乙醇水蒸气重整的性能,结合X射线衍射(XRD)的表征结果,研究了催化剂的构效关系.实验结果表明,Ni、Cr担载量为15%和5%的催化剂对乙醇中低温水蒸气重整反应(SRE)表现出较高的催化活性和选择性,400℃时乙醇转化率可达到98.9%,氢气选择性为51.4%;450℃时,转化率可达到100%,氢气选择性为73.8%.
Al2O3 supported Ni-Cr/MgAl2O4 spinel catalysts with various composition were prepared by impregnation method, and the catalysts were characterized by XRD. The catalytic properties of the catalysts for hydrogen production from ethanol steam reforming were tested in a fixed-bed reactor. The effects of catalysts composition and reaction conditions （reaction temperature, nH2O/nCH5OH ratio, and liquid space velocity） on the activity and selectivities of the catalyst were investigated. It was found that the Al2O3 supported Ni-Cr/MgAl2O4 spinel catalyst with 15% Ni and 5% Cr exhibited the best activity and selectivities for ethanol conversion. The conversion and selectivity of hydrogen reached 98.9% and 51.4% at 400 ℃ respectively, while those data was up to 100% and 73.8% at 450 ℃. The contributions of relevant reactions in SRE system were strongly influenced by the temperature.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2007年第5期385-390,共6页
Journal of Molecular Catalysis(China)
