Ni-Fe/La2O2CO3催化乙醇水蒸气重整制氢的研究

采用La2(CO3)3空气焙烧法制备了La2O2CO3载体、采用浸渍法制备了Ni,Fe不同比例的Ni-Fe双金属催化剂及Ni/La2O2CO3,Fe/La2 O2 CO3催化剂,考察了各催化剂从300～700℃催化乙醇水蒸气重整反应的性能,并用BET,XRD,TPR等技术对催化剂进行表征。结果表明,相对单一金属催化剂,Ni-Fe双金属催化剂均表现出更高的活性,这可能是因为高分散的Ni,Fe和LaFeyNi1-yO3的共存作用。其中Ni含量为10%,Fe含量为5%时的Ni-Fe/La2O2CO3表现出最高的活性,400℃时乙醇的转化率为100%,H2的选择性最高达到94.1%,而CO的选择性则低至1.2%。

La2O2CO3 Supported Ni-Fe Catalysts for Hydrogen Production from Steam Reforming of Ethanol

La2O2CO3 was prepared by calcination of La2(CO3)3 in the air,and the catalysts Ni-Fe/La2O2CO3 with different mole ratio of Ni to Fe,Ni/La2O2CO3 and Fe/La2O2CO3 were prepared by impregnation method.The catalytic properties were evaluated on steam reforming of ethanol(SRE) from 300 to 700 ℃ under atmospheric pressure.The samples were characterized by BET,X-ray diffraction(XRD) and temperature programmed reduction(TPR).The results showed that Ni-Fe bimetallic catalysts exhibited higher activities than single metallic catalysts,which was attributed to the co-existence of well dispersed Ni,Fe and LaFeyNi1-yO3.It was found that the catalyst Ni-Fe/La2O2CO3 containing 10% Ni and 5% Fe showed the best performance,and the conversion of ethanol was 100%,the selectivity of H2 was reached 94.1%,and the selectivity of CO was low to 1.2% at 400 ℃.