Effect of preparation method on the performance of Pd-MnOx/γ-Al2O3 monolithic catalysts for ground-level O3 decomposition

doi:10.1016/S1872-2067(14)60176-5

Abstract

Abstract:

MnO_x+γ-Al₂O₃and MnO_x/γ-Al₂O₃ catalysts were prepared by the sol-gel and sequential precipitation methods, respectively. The same amount of Pd was loaded on these catalysts by incipient wetness impregnation. The two Pd-MnO_x/γ-Al₂O₃catalysts with different physicochemical properties were coated on cordierite. The catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and N₂ adsorption-desorption measurement. The preparation method and calcination temperature of MnO_x have significant impact on the crystalline phase of MnO_x, MnO_x species and active oxygen species, and textural properties of the catalysts. The experimental results showed that 0.60 μL·L^-1 of ozone was completely decomposed on these catalysts in the temperature range of 16 to 90 ℃ at space velocities from 380000 to 580000 h^-1. In particular, the activity for O₃ decomposition was excellent on the Pd/MnO_x+Pd/γ-Al₂O₃catalyst that used MnO_x prepared by the sol-gel method. Mnⁿ⁺ is beneficial for O₃ decomposition, and Mn²⁺, Mn³⁺, and Mn⁴⁺were presented in a mole ratio of 1.7:1:3 on the surface of the catalyst.

Key words: Manganese oxide, Palladium, Ozone, Catalytic decomposition, Preparation method

Chengjun Ren, Lina Zhou, Hongyan Shang, Yaoqiang Chen. Effect of preparation method on the performance of Pd-MnO_x/γ-Al₂O₃ monolithic catalysts for ground-level O₃ decomposition[J]. Chinese Journal of Catalysis, 2014, 35(11): 1883-1891.

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Effect of preparation method on the performance of Pd-MnO_x/γ-Al₂O₃ monolithic catalysts for ground-level O₃ decomposition

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