乙酸水蒸气重整制氢中载体组成对催化剂性能的影响

摘要

采用溶胶–凝胶法结合湿浸渍法制备了Ni/ZrO2、Ni/La2O3-ZrO2和Ni/La2O3催化剂，采用XRD、BET、TG及 H2-TPR等方法对催化剂的结构和性质进行了表征。通过生物油模型物乙酸水蒸气重整反应，探讨了载体组成对催化剂性能和积炭形成的影响。载体组分不同的Ni催化剂具有不同的Ni颗粒尺寸、孔结构和Ni–载体相互作用，这对乙酸水蒸气重整反应路径有重要影响。催化剂 Ni/70wt%La2O3-ZrO2在乙酸水蒸重整反应中表现出较好的催化性能和稳定性，在反应时间10 h内，氢气产率保持在76.05%以上；同时，TG和XRD分析结果表明， Ni/70wt%La2O3-ZrO2具有较好的抗烧结能力和较低的积炭率。%A series of Ni/ZrO2, Ni/La2O3-ZrO2 and Ni/La2O3 catalysts were prepared through a sol-gel method coupling with wet impregnation and were characterized by XRD, BET, TG, H2-TPR. Effects of support composition on catalytic activities and the formation of carbon deposition were discussed in the steam reforming of acetic acid. The catalysts with different support composition possess different Ni particles sizes, structural properties and different interaction between Ni and the support, which play an important role on the reaction pathway. Ni/70wt%La2O3-ZrO2 shows good catalytic activities and stability in the reforming reaction, and the H2 yield maintain above 76.05% at 600°C for a period of 10 h. No sintering of Ni particles and low carbon formation occur over Ni/70wt%La2O3-ZrO2, which is supported by TG and XRD analysis.