Deactivation effects of Pb(II) and sulfur dioxide on a γ-MnO2 catalyst for combustion of chlorobenzene
| Autor: | Pengfei Sun, Shuang Cao, Yunpeng Long, Xiaole Weng, Yu Long, Zhongbiao Wu |
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| Rok vydání: | 2020 |
| Předmět: |
Chemistry
Inorganic chemistry Environmental pollution 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Combustion 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry X-ray photoelectron spectroscopy Chlorobenzene 0210 nano-technology Selectivity Sulfur dioxide |
| Zdroj: | Journal of Colloid and Interface Science. 559:96-104 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2019.09.059 |
| Popis: | Mn-based catalysts are extensively used; herein, the poisoning mechanism of Pb2+ and SO2 on the γ-MnO2 catalyst during the combustion of chlorobenzene (CB) was studied. The oxidizability/reducibility, surface acidity and water activation property of the Pb/SO42- modified γ-MnO2 were analyzed by using XPS, H2-TPR/O2-TPD, NH3-TPD/Pyridine-IR and H2O-TPD. Catalytic performance and byproduct selectivity towards CB combustion were explored, indicating that Pb2+ and SO2 both impacted CB conversion and CO2 selectivity as indicated by the loss of oxidation properties and surface acidity. Analysis of the byproducts showed that Pb2+ and SO2 induced the formation of more toxic polychlorinated byproducts, thereby introducing new secondary environmental pollution risks. |
| Databáze: | OpenAIRE |
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