Highly Active and Stable Co3O4/ZSM-5 Catalyst for Propane Oxidation: Effect of the Preparation Method

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• 作者：Zengzan Zhu ; Guanzhong Lu ; Zhigang Zhang ; Yun Guo ; Yanglong Guo ; Yanqin Wang
• 刊名：ACS Catalysis
• 出版年：2013
• 出版时间：June 7, 2013
• 年：2013
• 卷：3
• 期：6
• 页码：1154-1164
• 全文大小：663K
• 年卷期：v.3,no.6(June 7, 2013)
• ISSN：2155-5435

文摘

Co₃O₄ supported on ZSM-5 (Co₃O₄/ZSM-5) catalysts were prepared by impregnation (IM), deposition precipitation (DP), and hydrothermal (HT) methods. Their catalytic performances for the total oxidation of propane were tested, and their physicochemical properties were investigated by low-temperature N₂ adsorption, XRD, FT-IR absorption spectroscopy, XPS, H₂-TPR, TEM, and CO chemisorption. The results show that the catalytic activity of Co₃O₄/ZSM-5 for propane oxidation is higher than that of 1.5 wt % Pd/ZSM-5, and the preparation methods remarkably affect the catalytic activity of Co₃O₄/ZSM-5. Among four Co₃O₄/ZSM-5 catalysts prepared by different methods, the catalyst prepared by the HT method possesses the highest catalytic activity for propane oxidation, and their catalytic activities are varied in the order of HT > DP > IM. For the Co₃O₄/ZSM-5 (DP) catalysts, the precipitant has an evident influence on their catalytic activities. For instance, the DP catalyst prepared with ammonium bicarbonate precipitant has a higher catalytic activity than the catalyst prepared with sodium hydroxide precipitant. The excellent catalytic activity of Co₃O₄/ZSM-5 (HT) may be attributed to the better reducibility of Co³⁺, higher Co³⁺ content, higher surface concentration, and fast migration of the lattice oxygen of Co₃O₄ on this catalyst. Furthermore, the Co₃O₄/ZSM-5 catalyst prepared by the HT method exhibits a high stability after being used at 500 掳C for 40 h.

Keywords:

Co₃O₄/ZSM-5; propane oxidation; catalyst preparation; high stability; high activity