Plasma‐Catalytic Reactions for Soot Oxidation on VO_x/M (M=KIT‐6, SBA‐15 and SiO₂) Catalysts: Influence of Pore Structure

Abstract

In this work, the effect of pore structure for VO x /M (M = KIT-6, SBA-15 and SiO 2 ) catalysts on plasma-catalytic soot oxidation was investigated. The combination of VO x /KIT-6 and plasma shows the highest soot oxidation rate, followed by VO x /SBA-15packed and VO x /SiO 2 -packed plasma reactor. The soot oxidation rate of 97.4 % and the energy efficiency of 0.95 g kWh À 1 can be achieved in plasma-catalytic soot oxidation over VO x /KIT-6 at 30 th min and 20 W. The catalysts were characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS). The results illustrated that VO x /KIT-6 and VO x /SBA-15 had large specific surface areas and good dispersion of vanadium species. The H 2 -TPR and XPS results confirmed that VO x /KIT-6 had stronger reducibility and higher relative content of O ads /(O ads + O latt ) than those of VO x /SBA-15 and VO x /SiO 2 . The good performance of soot oxidation in the plasma-catalytic systems over VO x /KIT-6 could be attributed to 1) the welldeveloped 3D mesoporous structure, which facilitated the transportation of radicals and active species, and 2) improved redox properties of VO x /KIT-6, since more active sites and surface adsorbed oxygen species on the catalyst surfaces could contribute to soot oxidation.

Preparation of Ni@Pd Core–Shell Nanoparticles Supported on KIT-6 by Ultrasound-Assisted Galvanic Replacement for Dodecahydro-N-ethylcarbazole Dehydrogenation

“…Ahn et al showed that KIT-6 is a promising catalyst support for LOHC dehydrogenation reactions . The pure-silica mesoporous molecular sieve KIT-6 with an ordered three-dimensional bicontinuous pore structure has the advantages of low acidity, a large specific surface area, and excellent hydrothermal stability. − In addition, KIT-6 has abundant surface silicon (Si–OH), which is easy to chemically modify. The application of core–shell/KIT-6 catalysts prepared by a GRR to the H12-NEC dehydrogenation reaction has not yet been reported.…”

Structure-Sensitive Behavior of Supported Vanadia-Based Catalysts for Combustion of Soot

“…Commercial V-based catalysts for SCR reaction also showed great activity in soot oxidation [44,45]. Another application of vanadiumcontaining catalysts in the field of soot combustion is plasma-assisted oxidation [46,47].…”