Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N 2 O decomposition
| العنوان: | Promotion effect of rare earth elements (Ce, Nd, Pr) on physicochemical properties of M-Al mixed oxides (M = Cu, Ni, Co) and their catalytic activity in N 2 O decomposition |
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| المؤلفون: | Ho, Hoang Phuoc, 1983, Jabłońska, Magdalena, Beltrami, Giada, Martucci, Annalisa, Cacciaguerra, Thomas, Paulus, Werner, Di Renzo, Francesco, Fornasari, Giuseppe, Vaccari, Angelo, Benito, Patricia, Palkovits, Regina |
| المصدر: | Journal of Materials Science. 56(27):15012-15028 |
| الوصف: | A series of M-AlOx mixed oxides (M = Cu, Co, Ni) with the addition of high loadings of rare earth elements (REE, R = Ce, Nd, Pr; R0.5M0.8Al0.2, molar ratio) were investigated in N2O decomposition. The precursors were prepared by coprecipitation and subsequent calcination at 600 °C. The obtained mixed metal oxides were characterized by X-ray diffraction with Rietveld analysis, N2 sorption, and H2 temperature-programmed reduction. Depending on the nature of REE and the initial M-Al system, R cations could be separately segregated in oxide form or coordinated with the transition metal cations and form mixed structures. The addition of Ce3+ consistently led to nanocrystalline CeO2 mixed with the divalent oxides, whereas the addition of Nd3+ or Pr3+ resulted in the formation of their respective oxide phases as well as perovskites/Ruddlesden–Popper phases. The presence of REE modified the textural and redox properties of the calcined materials. The rare earth element-induced formation of low-temperature reducible MOx species that systematically improved the N2O decomposition on the modified catalysts compared to the pristine M-Al materials by the order of Co > Ni > Cu. The Ce0.5Co0.8Al0.2 catalyst revealed the highest activity and remained stable (approximately 90% of N2O conversion) for 50 h during time-on-stream in 1000 ppm N2O, 200 ppm NO, 20 000 ppm O2, 2500 ppm H2O/N2 balance at WHSV = 16 L g−1 h−1. |
| وصف الملف: | electronic |
| URL الوصول: | https://research.chalmers.se/publication/527618 https://research.chalmers.se/publication/527618/file/527618_Fulltext.pdf |
| قاعدة البيانات: | SwePub |
| تدمد: | 00222461 15734803 |
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| DOI: | 10.1007/s10853-021-06245-x |