摘要
用浸渍法制备了不同Cu质量分数的Ni-Cu/La2O3双金属催化剂,考察了金属浸渍顺序和Cu质量分数对催化剂甲烷部分氧化性能的影响,并通过BET、XRD、TPR和SEM等技术对催化剂进行了表征。结果表明,在甲烷部分氧化制合成气反应中,Cu助剂的添加对Ni/La2O3催化剂的活性有一定的改进作用,其中浸渍顺序对催化剂的性能影响很大,共浸渍制备的催化剂活性相对较好;Cu质量分数为5%-7%时催化剂有较好的活性和稳定性;XRD等测试表明,Cu和Ni金属由于相同的晶型结构及离子半径在制备过程中形成了双金属固溶体,提高了活性组分Ni的分散度,减少了Ni晶粒的烧结聚集长大,从而提高了催化剂的活性和稳定性。
Partial oxidation of methane to syngas over Ni-Cu bimetallic catalysts supported on La2O3 was stud- ied. The catalysts were prepared by wet impregnation with different metal impregnate order and with different contents of Cu while keep Ni 30% constant. The results of the catalytic evaluation in a fixed-bed reactor showed that the Ni-Cu/La2O3 had higher activity, the Ni-Cu co-impregnate was superior, and the catalysts with 5% 7% Cu loading had the best catalytic performance. In order to understand the Cu effect, the catalysts were characterized by XRD,TPR and SEM. Through XRD Ni-Cu alloy was observed in the Ni-Cu/La2O3 catalysts, the TPR results suggested that the alloy can reduce NiO at a lower temperature and produce more Ni site. SEM showed that a low carbon deposition was formed on Ni-Cu/La2O3 which exhibited a stable activity.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2007年第3期319-323,共5页
Journal of Fuel Chemistry and Technology
