ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

K⁺ doping Ce-Sm oxide catalysts on cordierite honeycomb ceramic substrate for soot catalytic combustion

Ronglu Shu, Yifan Du, Liping Cao, Hui Zhao, Xiaoying Luo, and Wei Wang

Key Laboratory of Degraded and Unused Land Consolidation Engineering the Ministry of Land and Resources of China, School of Water and Environment, Chang′an University, Xi′an, China

E-mail: wwchem@126.com

Received: 8 April 2023  Accepted: 11 November 2023

Abstract:

Cerium samarium oxides catalysts with K⁺ doping on the wall surface of cordierite honeycomb ceramics were preparation by sol–gel and dipping processes. Scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform-infrared spectroscopy were used to characterize the structural morphology and phase compositions. Through XPS analysis and H₂-TPR measurement of monolithic catalyst, it is found that potassium ions improve the oxygen mobility in CeO₂ lattice and form surface active oxygen, increase the amount of oxygen adsorbed on the surface and improve the oxidation–reduction capacity. The catalytic combustion research demonstrates that T₁₀, T₅₀ and T_m in samples (Ce/Sm-0 K, Ce/Sm-0.3 K, Ce/Sm-0.5 K and Ce/Sm-0.7 K) decrease significantly compared with the blank reference (Cordierite). And the optimized sample Ce/Sm-0.5 K possess the lowest T₁₀ (389.6 °C), the lowest T₅₀ (425.5 °C), and the lowest T_m (419 °C) in comparison with other samples. The cycle stability investigation reveals that sample Ce/Sm-0.5 K has excellent structural stability and stable catalytic performance, which has potential application in soot catalytic combustion field.

Keywords: Catalyst; Soot combustion; Surface active oxygen; K+ doped modification

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-023-03236-x

Chemical Papers 78 (4) 2275–2285 (2024)