La2O3含量对La-Ni/ZrO2-Al2O3催化剂甲烷化性能的影响

摘要

ZrO2-Al2O3 composite oxides were prepared by impregnation method,and La-Ni/ZrO2-Al2O3 catalysts with different La2O3 contents were prepared by co-impregnation method.The effect of La2O3 contents was test for CO methanation and analyzed by BET,XRD and TPR.The results showed that introducing a small amount of La2O3 (2％-6％) into Ni/ZrO2-Al2O3 catalyst could increase its methanation activity,especially at low temperature range and high temperature range.Furthermore,the continuous reactions of 100 h under 500 ℃ were performed to investigate the stability performance and carbon deposition of the 4La-Ni/ZrO2-Al2O3 and Ni/ZrO2-Al2O3.The 4La-Ni/ZrO2-Al2O3 catalyst displayed superior stability and excellent anti-carbon deposition property than Ni/ZrO2-Al2O3.%采用浸渍法制备了复合氧化物ZrO2-Al2 O3,在此基础上采用共浸渍法制备了La-Ni/ZrO2-Al2 O3催化剂,考察了催化剂中La2O3含量对催化剂CO甲烷化活性的影响,并利用BET、XRD和TPR对催化剂的物化性能进行了分析.结果表明当La2 O3含量为2％ ～6％(质量分数,下同)时,其在低温和高温时的催化活性均比Ni/ZrO2-Al2O3有一定的提升.另外比较了催化剂4La-Ni/ZrO2-Al2O3和Ni/ZrO2-Al2O3在500℃下连续反应100 h的活性和积碳,结果显示催化剂4La-Ni/ZrO2-Al2O3具有很好的稳定性和优良的抗积碳性能.