摘要
采用浸渍法制备负载型催化剂Ni-ZrO_2/CNTs,考察金属Ni和ZrO_2负载量对CO_2甲烷化催化性能.利用X射线衍射,N2吸附,扫描电子显微镜和H2-TPR(氢气程序升温还原)等手段表征Ni-ZrO_2/CNTs样品.与金属镍负载量7%催化剂Ni(7)/CNTs相比,ZrO_2掺杂的催化剂Ni-ZrO_2/CNTs对CO_2甲烷化具有更高的催化活性,且随着ZrO_2掺杂量的增加先增大后减小,ZrO_2负载掺杂量为15%的催化剂Ni(7)-ZrO_2(15)/CNTs的催化性能最好.这归因于ZrO_2能够提高催化剂载体的Lewis碱度和抑制金属镍粒子在高温还原过程中烧结,从而改善CO_2在催化剂表面的吸附能力和提供更多的反应活性位.
The supported catalysts Ni-ZrO2/CNT was prepared by means of impregnation so as to find out about the catalytic performance of Ni and ZrO2 in CO2 methanation.Several techniques such as X-ray diffraction,N2-sorption,scanning electron microscope,and H2-temperature-programmed reduction were employed to characterize the thus-obtained samples.Compared with Ni（7）/CNTs with 7% metallic nickel loading,ZrO2-doped Ni-ZrO2/CNTs catalysts exhibited higher catalytic activity,which increased and then decreased with the increase of ZrO2 doping.Ni（7）-ZrO2（15）/CNTs with 15% of ZrO2 doping was found to have the best catalytic activity.It＇s ascribed to the enhanced Lewis basicity of catalyst support and the restrained sintering of metallic nickel in high-temperature reduction system,which has led to the improved sorption capacity of CO2 on the Ni（7）-ZrO2（15）/CNTs surface and sufficient reactive sites for CO2 methanation.
作者
黄明
王珂
潘玉恬
周远亮
付孝锦
HUANG Ming;WANG Ke;PAN Yutian;ZHOU Yuanliang;FU Xiaojin(College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang,Sichuan 641199,China)
出处
《内江师范学院学报》
2018年第10期70-75,共6页
Journal of Neijiang Normal University
基金
四川省大学生创新创业训练计划项目(X2017029)
