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Highly flexible and active potassium-supported sepiolite paper catalysts for soot oxidation

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 catalyst 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. The very low value for △T (T50−T10) of approximately 10°C implied a high reaction rate in the catalytic combustion process. K-Sep-400 showed good reusability with the T50 of about 470 °C after 5 cycles of TPO runs, as well as favourable hydrothermal stability. The co-existed potassium species (KNO3, K2O and K-O-Si) in the sepiolite paper catalysts could participate cooperatively and play decisive roles in soot catalytic oxidation process. The atomic ratio of free to confined K species was calculated from XPS (K2p) results, which was decreased with elevated sintering temperatures of sepiolite paper matrix.

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Supplementary files

Article information


Submitted
29 Dec 2019
Accepted
04 Feb 2020
First published
05 Feb 2020

Catal. Sci. Technol., 2020, Accepted Manuscript
Article type
Paper

Highly flexible and active potassium-supported sepiolite paper catalysts for soot oxidation

G. Yu, H. Ma, J. Wang, S. Qin, Z. Yang and Y. Li, Catal. Sci. Technol., 2020, Accepted Manuscript , DOI: 10.1039/C9CY02609F

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