Support-induced effect on the catalytic properties of Pd particles in water denitrification: Impact of surface and structural features of mesoporous ceria-zirconia support

• Published in: Applied catalysis. B, Environmental Environmental, 2018-05, Vol.224, p.648-659
• Main Authors: Granger, P., Troncéa, S., Dacquin, J.P., Trentesaux, M., Parvulescu, V.I.
• Format: Article
• Language: English
• Subjects: Catalysis; Catalytic nitrite reduction; Ce0.5Zr0.5O2 mixed oxides; Cerium oxides; Chemical Sciences; Coprecipitation; Cube texture; Denitrification; Drinking water; Evaporation; Fluorite; Hydrogen; Inhomogeneity; Localization; Mesoporous materials; Nitrites; Palladium; Properties (attributes); Reduction; Self-assembly; Stabilization; Surface analysis (chemical); Zirconia; Zirconium dioxide
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2017.11.007

[Display omitted] •Structural inhomogeneity in coprecipitated CexZr1-xO2 compared to the EISA method.•Higher efficiency of Pd in nitrates reduction supported on CexZr1-xO2 obtained from EISA method.•Lower ammonia formation on low loaded Pd/CexZr1-xO2 catalyst prepared by the EISA method. The support effect on the catalytic properties of palladium particles has been investigated in the reduction of nitrites by hydrogen at 20°C in batch conditions. The support material was composed of ceria-zirconia mixed oxide stabilized in the tetragonal structure according to an Evaporation Induced Self-Assembly method. In comparison, a co-precipitation method leads to inhomogeneity in composition related to the partial segregation of the cubic fluorite structure of CeO2. Further textural properties obtained for the two synthesis routes differ as well as changes in the reducibility. Surface analysis demonstrated a more extensive surface reduction of Ce4+ to Ce3+ on the series prepared by coprecipitation correlated to a greater stabilization of metallic Pd particles. However, the best catalytic performances were obtained on low loaded Pd samples supported on the ceria-zirconia support prepared by the Evaporation Induced Self-Assembly method which emphasizes the fact that catalytic properties cannot be simply explained by the stabilization of zero valent precious metal at the vicinity of anionic vacancies. Further calculations of TOF and interfacial rates were achieved and compared to the selectivity behavior suggesting that the localization of Pd in contact with the tetragonal or cubic structure of the solid solution and CeO2 could play a key role in determining the catalytic properties.