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A citric acid-assisted deposition strategy to synthesize mesoporous SiO2-confined highly dispersed LaMnO3 perovskite nanoparticles for n-butylamine catalytic oxidation
- Source :
- RSC Advances. 9:8454-8462
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- Catalytic oxidation can efficiently eliminate nitrogen-containing volatile organic compounds (NVOCs) and suppress the generation of toxic NOx in order to avoid secondary pollution. In this study, mesoporous SiO2-confined LaMnO3 perovskite nanoparticles with high dispersion were successfully prepared by a citric acid-assisted deposition method (LMO/SiO2-SD) and tested for the oxidation of n-butylamine. The method utilized the synergistic effect of abundant active hydroxyl groups existing on the SiO2 gel surface and citric acid, rendering the metal ions more uniformly scattered on the SiO2 surface. Strikingly, the LMO/SiO2-SD sample exhibited the optimum catalytic performance (T90 at 246 °C) and the highest N2 selectivity, which was mainly ascribed to its abundant surface acid sites, superior low-temperature reducibility and higher ratio of surface Mn4+ species. The apparent activation energy (Ea) for n-butylamine oxidation over LMO/SiO2-SD sample was 29.0 kJ mol−1. Furthermore, the reaction mechanism of n-butylamine oxidation was investigated by in situ FITR and a reasonable reaction route for n-butylamine oxidation over the LMO/SiO2-SD sample was proposed.
- Subjects :
- Reaction mechanism
General Chemical Engineering
Metal ions in aqueous solution
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Catalysis
chemistry.chemical_compound
Catalytic oxidation
Chemical engineering
chemistry
0210 nano-technology
Mesoporous material
Citric acid
NOx
Perovskite (structure)
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- RSC Advances
- Accession number :
- edsair.doi...........acecaaf0253472c0712c3874e36fe329