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- 저자 : Gerard Delahay (검색결과 1 건)
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Jihene Arfaoui,Abdelhamid Ghorbel,Carolina Petitto,Gerard Delahay 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
New MoO3 or WO3 modified CeO2-ZrO2 aerogel catalysts were elaborated using the sol gel methodcombined to supercritical drying for the NO-SCR by NH3 in excess of O2. XRD, N2-Physisorption, NH3-TPD,H2-TPR and DRUV-Vis spectroscopy were used to analyse the samples. The results reveal that all theaerogel powders (ZrO2, CeO2-ZrO2, MoO3-ZrO2, WO3-ZrO2, MoO3-CeO2-ZrO2 and WO3-CeO2-ZrO2),calcined at 500 C, are nanostructured and mesoporous materials, developing essentially the diffractionpeaks of the ZrO2 tetragonal phase, which was stabilized by the presence of cerium. Ce, Mo and W specieswere found highly dispersed on the zirconia surface, their nature and the diverse interactions developedbetween them affect the crystallites size of ZrO2, acidity, reducibility, surface oxygen mobility of catalystsand influence extremely their SCR activity. Higher NO-SCR performances are obtained, between 200 and500 C, over the new ternary MoO3-CeO2-ZrO2 and WO3-CeO2-ZrO2 catalysts compared to correspondingbinary systems (CeO2-ZrO2, MoO3-ZrO2 and WO3-ZrO2). This discloses a synergism in the NO-SCR relatedto the existence of strong interactions Ce$Mo and Ce$W. Interestingly, above 90 % NO conversions intoessentially N2 (97 %) are achieved between 350 and 500 C over the most efficient MoO3-CeO2-ZrO2ternary catalyst.
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