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

• Published in: Catalysis science & technology 2020-03, Vol.1 (6), p.1875-188
• Main Authors: Yu, Gang, Ma, Hongmei, Wang, Jing, Qin, Shengjian, Yang, Zhigang, Li, Yanting
• Format: Article
• Language: English
• Subjects: Catalysts; Oxidation; Papermaking; Potassium; Sepiolite; Soot; X ray photoelectron spectroscopy
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/c9cy02609f

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, CO 2 -TPD and soot-TPO techniques. All the samples showed T 10 , T 50 and T 90 at about 400 °C, 410 °C and 430 °C, respectively. A very low Δ T ( T 50 − T 10 ) value of approximately 10 °C implied a high reaction rate in the catalytic combustion process. K-Sep-400 showed good reusability with a T 50 value of about 470 °C after 5 cycles of TPO runs, as well as favourable hydrothermal stability. The co-existing potassium species (KNO 3 , K 2 O 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. Highly flexible and active potassium-supported sepiolite paper catalysts were fabricated via a facile wet paper-making method.