Isothermal catalytic oxidation of diesel soot on Yttria-stabilized Zirconia

Investigations of soot combustion on yttria-stabilized zirconia by environmental transmission electron microscopy (ETEM)

“…The crystallographic fluorite structure of the YSZ grains was unchanged, and the surface of the YSZ grains appeared to be perfectly clean. This observation is different from our recent results [9], where isothermal oxidation experiments (IOEs) of soot on YSZ were performed at a lower temperature (390 • C) in 5% O 2 in He at the atmospheric pressure. At the end of the IOEs, a thin layer of carbon was found over the catalyst, implying that the soot had slowly spread and covered the YSZ grains.…”

“…3. On YSZ-CAST soot mixture (black line), soot conversion starts from around 350 • C. A CO 2 emission peak is obtained at 530 • C. The oxidation of soot in CO 2 at a rather low temperature could be related to the tight contact mode, where the major part of the soot is in contact with the catalyst, allowing lower oxidation temperature and high CO 2 selectivity because of YSZ furnishing O 2− to the soot and replenishing through the gas phase [5,9]. Experiment realized with Printex U and YSZ ("tight" contact) gave similar results, with an oxidation temperature slightly shifted toward higher values.…”

“…We have recently investigated the catalytic properties of yttriastabilized zirconia (YSZ) [3,5,9]. Zirconia alone already presents a catalytic effect for soot oxidation.…”

Size-dependent activity of Pt/yttria-stabilized zirconia catalyst for ethylene and carbon monoxide oxidation in oxygen-free gas environment

“…4S in SI). Recently, it has been shown that YSZ support is able to oxidize VOC and soot at temperatures higher than 270°C in excess of molecular oxygen [12,14,19,20]. Similar to electrooxidation by O 2À , the oxidation of both CO and C 2 H 4 by gas-phase oxygen is particle-size dependent.…”

“…In addition, carbon deposition on Pt/YSZ via Boudouard reaction or ethylene cracking can take place [17,18], and this chemically formed carbon will be electrochemically removed via [16,19,20] …”