Effect of MnO x modification and template type on the catalytic performance of ceria-zirconia in CO and soot oxidation
| Autor: | A. V. Fionov, Svetlana V. Bataeva, Ekaterina S. Lokteva, Elena V. Golubina, A. V. Shumyantsev, Konstantin I. Maslakov, Alexey O. Kamaev, Oksana Ya. Isaikina, Igor Yu. Kaplin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Chemistry
General Chemical Engineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease_cause 01 natural sciences Soot 0104 chemical sciences Catalysis Chemical engineering visual_art medicine visual_art.visual_art_medium Cubic zirconia Sawdust 0210 nano-technology |
| Zdroj: | Pure and Applied Chemistry. 93:447-462 |
| ISSN: | 1365-3075 0033-4545 |
| Popis: | The effect of the template nature and modification with MnO x on the catalytic efficiency of Ce0.8Zr0.2O2 (CZ) in oxidation of CO (2 vol% CO and 1 vol% O2 in He, pulse feeding) and soot particles (tight contact between soot and catalyst, TGA/DSC) was analyzed. The CZ catalysts were prepared using the CTAB and sawdust (SD) templates and modified with Mn (8 wt%) by wet impregnation followed by calcination at 400 °С. SEM-EDS, XRD, Raman and photoelectron spectroscopy, N2 adsorption, EPR, TPR-H2 and catalytic tests results demonstrated better catalytic activity of CZ(SD) in CO oxidation than of CZ(CTAB) because of the biomorphic texture, higher structural defectiveness and improved oxygen mobility of the former catalyst. Low surface reducibility and low concentration of active oxygen species on the CZ(SD) surface deteriorated its catalytic efficiency in the topochemical reaction of soot oxidation. Despite the different structure and degree of interaction between MnO x and CZ, the Mn-modified catalysts showed the similar catalytic properties: much better than of both unmodified catalysts in CO oxidation and worse than of CZ(CTAB) in soot oxidation. Mn2+ ions incorporated better into the surface layer of CZ(SD) than of CZ(CTAB), for which the inhomogeneous distribution of MnO x and decreased specific surface area were observed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|