Abstract
A series of Pd-, Ce-, Co-, and Ti- doped OMS-2 catalysts were prepared by a one-step hydrothermal method. The removal of o-xylene by a combination of metal-doped OMS-2/γ-Al2O3 catalysts and nonthermal plasma was systematically investigated. Catalysts were characterized by inductively coupled plasma optical emission spectrometry (ICP-OES), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), extended X-ray absorption fine structure (EXAFS), X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). Among the metal-doped OMS-2/γ-Al2O3 catalysts used in the plasma-catalytic process, Pd0.07-OMS-2/γ-Al2O3 and Ce0.07-OMS-2/γ-Al2O3 exhibited excellent catalytic activity for o-xylene removal with 100% o-xylene conversion, above 60% CO2 selectivity, and above 80% (CO+CO2) (i.e., COx) yield at a low specific energy density of 18 J/L. These two catalysts had high redox ability, abundant surface defects for absorbing and activating oxygen, and more active surfa...
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