采用浸渍法制备Sm改性Ni/Al2O3催化剂并将其用于甲醇水蒸气重整制氢,考察了不同负载量Sm对Ni/Al2O3催化剂性能的影响。结果表明:Ni/Al2O3催化剂中添加Sm有利于NiO的形成,使还原后的催化剂得到更多的活性组分Ni,从而提高H2的选择性和CH3OH的转化率,降低CO的选择性。此外, Sm的最佳负载量为10%,此时H2选择性为95.8%,甲醇转化率为92.6%, CO的选择性降至4.9%。当Sm负载量高于10%时,催化剂中NiO粒径过大,催化剂性能降低。
The incipient wetness method was used to prepare Sm modified Ni/Al2O3 catalysts which was applied in methanol steam reforming for hydrogen production. Effects of the rare-earth metal Sm on catalytic activity were investigated. The results indicated that the addition of Sm is favorable for the separation of NiO from NiAl2O4, resulted in the increase of amount of Ni after the reduction process. Thus, the H2 selectivity was improved from 86.7% to 95.8% and methanol conversion was improved from 82.6% to 92.6%, while the CO selectivity was decreased from 21.9% to 4.9%. The optimum content of Sm in the catalyst is 10%. Above this content, the particle size of NiO is oversize, then catalytic activity is decreased.
JOURNAL OF THE CHINESE SOCIETY OF RARE EARTHS
Methanol steam reforming
彭稳(1993 -),男,硕士研究生;研究方向:环境功能材料及催化;通讯联系人:何德东(E-mail: dedong. he@ qq. com).