An oxygen pool from YBaCo₄O₇-based oxides for soot combustion

Abstract

Soot, often referred to as black carbon emitted from diesel engines, is not only a particulate matter pollutant but also a light-absorbing agent that may affect global climate, but can be effectively controlled using a catalytic diesel particulate filter (DPF). A new YBaCo 4 O 7+δ-type oxygen storage material is reported as an effective catalyst for soot combustion. Isotopic isothermal reactions demonstrate the activation of gaseous oxygen and subsequent oxygen storage and reaction/desorption during an oxidation process. High activity and structural stability are achieved by the substitution of Co with Al and Ga to form YBaIJCo 0.85 Al 0.075 Ga 0.075) 4 O 7+δ. The specific rates at 300°C of YBaCo 4 O 7+δ and YBaIJCo 0.85 Al 0.075 Ga 0.075) 4 O 7+δ , normalized by surface areas, are an order of magnitude higher than those of CeO 2-based oxides. This kind of oxygen-storage material acts as an oxygen pool, which ensures that the accumulated soot on a DPF can be promptly combusted.

Photocatalytic H2 Evolution from Ammonia Borane: Improvement of Charge Separation and Directional Charge Transmission

“…The peaks with typical structure characteristics of LDHs were clearly observed in all samples. In the case of Co/CoFe−C, the (003), (006), (012), (015), (018), (110), (113) and (1013) basal reflection planes (JCPDS Card NO.50‐0235) were observed at about 11.4°, 23.2°, 34.0°, 38.5°, 46.0°, 58.9°, 60.4° and 64.4°, respectively . The corresponding basal spacing (d003) of Co/CoFe−C, Co/NiFe−C and Co/ZnFe−C were about 0.78 nm, 0.78 nm and 0.68 nm, respectively.…”

Research Advances in Rare Earth Oxide‐Based Catalysts for Soot Combustion

“…Tian et al. investigated the activity and stability of Al‐ and Ga‐modified YBaCo 4 O 7 catalysts for catalytic soot combustion by isotopic isothermal reactions [125] . The results indicated that the reaction rate of YBa(Co 0.85 Al 0.075 Ga 0.075 ) 4 O 7+δ at 300 °C was ten times higher than CeO 2 ‐based oxides.…”

Fabrication of ultrafine Pd nanoparticles on 3D ordered macroporous TiO2 for enhanced catalytic activity during diesel soot combustion

“…One efficient exhaust gas treatment system is the continuously regenerating particulate trap (CRT) technique, which is based on the use of highly active catalytic materials [3,4]. Over several decades of development, several materials exhibiting high catalytic activity for soot combustion have been identified, including noble metals, transition metal oxides, alkaline metal oxides, perovskite-like oxides and ceria-based oxides [5][6][7][8][9]. However, it remains challenging to fabricate highly active catalytic systems for soot combustion, and developing high-performance catalysts requires an understanding of the properties that affect catalytic activity.…”