Oxidation of carbon by CeO2: Effect of the contact between carbon and catalyst particles

Modelling of Carbon Black oxidation in the presence of CeO2 catalyst using a 3D representation of the solid–solid mixture

“…Even if in a real catalytic filter the soot-catalyst contact is assumed to be loose or poor [17], it is better from a practical point of view to obtain catalytic results with samples exhibiting a tight contact between CB and catalyst, in order to enhance the effect of the contact for the different CB-CeO 2 ratio samples which have to be tested. Moreover, loose contact mixtures were previously investigated in our laboratory (see [16,28]). No significant effect of the presence of CeO 2 on CB oxidation was found in a loose type mixture (see [16]).…”

“…Hence the active oxygen soot combustion depends on the soot-ceria contact. The activity of the oxidation catalysts for soot combustion is mainly investigated by means of a temperature programmed oxidation (TPO) process which can be carried out by TGA or in a fixed bed reactor [16]. A challenging aspect to be considered for catalytic soot combustion is how to mimic such a contact in laboratory experiments with powder catalyst.…”

“…Two types of contact are usually explored [18]: (i) loose contact, for which the catalyst-carbon mixture is prepared using a spatula and (ii) tight contact, obtained through an intimate milling of the two solids. Many physico-chemical experiments and studies have been performed which are focused on the characterization of the contact between soot and catalyst particles [16,19]. Different catalysts were tested considering the influence of both the shape and the material which is used as catalyst, in order to obtain the better activity or efficiency for soot oxidation [18].…”

Catalytic Carbon Oxidation in The Presence of Cerium Oxide: Experimental Study and Modeling of The Effect of Oxygen Concentration

“…The solids were grinded together in an agate mortar for 15 minutes to ensure a tight contact between them. The samples of CB/CeO 2 were characterized by electron scanning microscopy (SEM) and the results are shown elsewhere [16]. SEM pictures allow to estimate the mean diameter of catalyst particles as reported in a previous paper [16].…”

Application of Modified Coke to NOx Reduction with Recycling Flue Gas during Iron Ore Sintering Process

“…17,18) The NO x emissions in the CeO 2 modified coke combustion with recycling flue gas are shown in Fig. 7.…”