| Title: | Investigation of synergistic effects and high performance of La-Co composite oxides for toluene catalytic oxidation at low temperature |
| Author(s): | Wu M; Chen S; Soomro A; Ma S; Zhu M; Hua X; Xiang W; |
| Address: | "Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, 210096, China. wgxiang@seu.edu.cn" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-019-04672-7 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "Cobalt oxides have been considered as a kind of highly efficient catalyst for the oxidation of volatile organic compounds (VOCs). In this work, lanthanum-cobalt composite oxides were prepared by using the co-precipitation method, and toluene was used as the model compound. Diversified techniques including XRD, SEM, Raman spectra, XPS, H(2)-TPR, and N(2) adsorption-desorption were applied to investigate the physicochemical properties of as-prepared materials. The composite catalysts showed different morphology including larger specific surface area and higher pore volume which would accelerate the adsorption of toluene and improve the amount of active sites on surface. Moreover, the addition of lanthanum could enhance the low-temperature reducibility, and it could be also beneficial to expose more Co(3+) and adsorbed oxygen species on the surface of catalysts which could accelerate the oxidation of toluene and lower onset oxidation temperature. 0.05La-Co (with a molar ratio of lanthanum against cobalt is 0.05) showed the best catalytic performance. The complete conversion of toluene was achieved at 225 degrees C under the condition of toluene concentration = 1000 ppm and SV = 20,000 ml.g(-1).h(-1). Stability test over 0.05La-Co was conducted at 225 degrees C and it could maintain the 100% conversion of toluene for 720 min, indicating the excellent stability of as-prepared catalysts. Undoubtedly, lanthanum-cobalt composite oxide is a kind of promising material for the catalytic oxidation of VOCs" |
| Keywords: | "Adsorption Catalysis Cobalt/chemistry *Cold Temperature Lanthanum/chemistry *Models, Chemical Oxidation-Reduction Oxides/chemistry Oxygen/chemistry Surface Properties Temperature Toluene/*chemistry Volatile Organic Compounds/chemistry Catalytic oxidation;" |
| Notes: | "MedlineWu, Mudi Chen, Shiyi Soomro, Ahsanullah Ma, Shiwei Zhu, Min Hua, Xinguo Xiang, Wenguo eng 51606038/National Natural Science Foundation of China (CN)/ BK20160672/Natural Science Foundation of Jiangsu Province/ Germany 2019/03/04 Environ Sci Pollut Res Int. 2019 Apr; 26(12):12123-12135. doi: 10.1007/s11356-019-04672-7. Epub 2019 Mar 2" |
