SCHEDULED MAINTENANCE
Highly flexible and active potassium-supported sepiolite paper catalysts for soot oxidation†
*ab
Abstract
Highly flexible and active potassium-supported sepiolite paper catalysts were fabricated via a facile wet paper-making method. The structure, physicochemical properties and catalytic performance of the paper catalysts were characterized by XRD, TG-DSC, SEM, XPS, CO2-TPD and soot-TPO techniques. All the samples showed T10, T50 and T90 at about 400 °C, 410 °C and 430 °C, respectively. A very low ΔT (T50 − T10) value of approximately 10 °C implied a high reaction rate in the catalytic combustion process. K–Sep-400 showed good reusability with a T50 value of about 470 °C after 5 cycles of TPO runs, as well as favourable hydrothermal stability. The co-existing potassium species (KNO3, K2O and K–O–Si) in the sepiolite paper catalysts could participate cooperatively and play decisive roles in catalytic soot oxidation processes. The atomic ratio of free to confined K species was calculated from XPS (K2p) results, which decreased with elevated sintering temperatures of the sepiolite paper matrix.
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