浸渍法制备的Pd-MnOx/γ-Al2O3催化剂及不同载体对地表O3降解的影响

doi:10.3866/PKU.WHXB201403101

Abstract

Abstract:

Pd-MnO_x/γ-Al₂O₃ catalysts were prepared by impregnating Pd and MnO_x on γ-Al₂O₃ supports, using an incipient wetness impregnation method, and then coating on a cordierite substrate to obtain monolithic catalysts. The catalysts were characterized using X-ray diffraction (XRD), temperatureprogrammed reduction of H₂ (H₂-TPR), low-temperature N₂ adsorption-desorption measurements, and Xray photoelectron spectroscopy (XPS). The effects of the Pd and MnO_x impregnation order on the catalytic activity, redox performance, textural properties, and surface electronic characteristics of the catalysts were studied. The experimental results showed that the activity of the catalyst co-impregnated with Pd and MnO_x on γ- Al₂O₃ was better than that of the catalyst impregnated sequentially with Pd and MnO_x. A synergetic effect was observed between Pd and MnO_x on the Pd-MnO_x/γ-Al₂O₃ catalysts for ozone decomposition. The effects of various supports on catalytic activity, redox performance, textural properties, and surface electron characteristics of the catalysts were also investigated. The results indicated that the catalytic activities of Pd-MnO_x/La-Al₂O₃ and Pd-MnO_x/SiO₂ catalysts were the best; ozone conversion reached 82% at 14 ℃ and ozone was completely decomposed at 36 ℃. The activity of the Pd-MnO_x/γ-Al₂O₃ catalyst was second better, but the activity of the Pd-MnO_x/Zr-Al₂O₃ catalyst was poor. The support clearly affects the reducibility of PdO and MnO_x. The redox performances of MnO_x impregnated on different supports followed the order: Pd-MnO_x/SiO₂>Pd-MnO_x/La-Al₂O₃>Pd-MnO_x/γ-Al₂O₃>Pd-MnO_x/Zr-Al₂O₃.

Key words: Manganese oxide, Palladium, Ozone, Catalytic decomposition, Impregnation method, Support

REN Cheng-Jun, ZHOU Li-Na, SHANG Hong-Yan, CHEN Yao-Qiang. Pd-MnO_x/γ-Al₂O₃ Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition[J]. Acta Phys. -Chim. Sin. 2014, 30(5), 957-964. doi: 10.3866/PKU.WHXB201403101

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Pd-MnO_x/γ-Al₂O₃ Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition

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Pd-MnOx/γ-Al2O3 Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition

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Pd-MnO_x/γ-Al₂O₃ Monolithic Catalysts Prepared by Impregnation Method and Effect of Different Supports on Ground-Level Ozone Decomposition