A facile approach for the preparation of biomorphic CuO-ZrO₂ catalyst for catalytic combustion of methane

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• 作者：Jingjie Luo^a ; Huiyuan Xu^a ; ^b ; Yuefeng Liu^a ; ^c ; Wei Chu^a ; ^{chuwei65@yahoo.com.cn} ; ^{chuwei1965scu@163.com} ; Chengfa Jiang^a ; ^{jiangcf@scu.edu.cn} ; Xiusong Zhao^d
• 关键词：Bio-template method ; Biomorphic CuO&ndash ; ZrO2 catalyst ; Methane catalytic combustion
• 刊名：Applied Catalysis A ; General
• 出版年：2012
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：7 May, 2012
• 卷：423-424
• 期：Complete
• 页码：121-129
• 文件大小：1524 K

摘要

A series of novel biomorphic CuO-ZrO₂ catalysts were prepared using a cotton bio-template and compared with conventional CuO-ZrO₂ catalysts. The physical and chemical properties of the as-obtained catalysts were characterized by techniques including X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), H₂-temperature programmed reduction (H₂-TPR), and O₂-temperature programmed desorption (O₂-TPD). The catalytic combustion of methane was chosen as the probe reaction. The results suggested that the bio-template method prepared porous biomorphic CuO-ZrO₂ catalysts consist of hollow microtubes. Comparing with conventional CuO-ZrO₂ catalysts, biomorphic CuO-ZrO₂ catalysts displayed better reducibility and oxygen mobility, stronger metal-oxides synergistic effect, appropriate particle size distribution, and lower activation energy. The crystalline state of zirconia transformed from a single crystallite phase of t-ZrO₂ into a complex of m-ZrO₂ and t-ZrO₂ after introducing the bio-template. With proper CuO content (20 mol%), the biomorphic CuO-ZrO₂ catalyst displayed preponderant properties. The compensation of surface lattice oxygen from bulk lattice oxygen was more available at high reaction temperatures.