Dry reforming of methane on active and coke resistant Ni/Y₂Zr₂O₇ catalysts treated by dielectric barrier discharge plasma

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• 作者：Xiuzhong Fang^a ; Jie Lian^a ; Kaiwen Nie^a ; Xianhua Zhang^a ; Yanfeng Dai^a ; Xianglan Xu^a ; Xiang Wang^a ; ^{xwang23@ncu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wenming Liu^a ; ^** ; ^{wmliu@ncu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Changqing Li^b ; Wufeng Zhou^b
• 关键词：Plasma treatment ; Y2Zr2O7 pyrochlore support ; Supported Ni catalysts ; Methane dry reforming ; Coke resistance
• 刊名：Journal of Energy Chemistry
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：25
• 期：5
• 页码：825-831
• 全文大小：2765 K

文摘

In this study, Ni/Y₂Zr₂O₇ catalysts prepared with impregnation method and treated by dielectric barrier discharge plasma (DBD) in different atmospheres have been investigated for methane dry reforming. It is revealed by H₂-TPR that plasma treatment can enhance the interaction between NiO/Ni particles and the Y₂Zr₂O₇ pyrochlore support. Therefore, catalysts with smaller NiO and Ni grains sizes, higher metallic Ni active surface areas can be achieved, as evidenced by XRD, TEM and H₂ adsorption-desorption measurements. As a consequence, the plasma-treated catalysts show significantly improved activity, stability and coke resistance, as testified by the TEM and TGA-DSC results. Plasma treatment in H₂/Ar gas mixture is found to be the best condition to prepare Ni/Y₂Zr₂O₇, which can be used to obtain a catalyst with the highest activity, stability and most potent coke resistance. It is believed that the smaller Ni grain size and higher metallic Ni active surface area induced by plasma treatment are the inherent reasons accounting for the promoted reaction performance of the Ni/Y₂Zr₂O₇ pyrochlore catalysts.