Catalytic Activity and Molecular Behavior of Lanthanum Modified CoSx/γ-Al2O3 Catalysts for the Reduction of SO2 to Sulfur in Smelter Off-Gas Using CO-H2 Mixture as Reductant
| Autor: | Yaseen Muhammad, Cuncun Zuo, Chen Hongnan, Lubin Wei, Chunshan Li, Tingting Ge |
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| Rok vydání: | 2019 |
| Předmět: |
General Chemical Engineering
Inorganic chemistry chemistry.chemical_element 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Redox Sulfur Industrial and Manufacturing Engineering Catalysis 020401 chemical engineering X-ray photoelectron spectroscopy chemistry Smelting Coal gas Lanthanum 0204 chemical engineering 0210 nano-technology Selectivity |
| Zdroj: | Industrial & Engineering Chemistry Research. 58:3595-3605 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.8b04323 |
| Popis: | In this study, a series of three-component CoSx/γ-Al2O3 catalysts were developed for the reduction of high-content SO2 to sulfur in smelter off-gas. The introduction of a small amount of lanthanum additive greatly improved the catalytic activity and stability of Co-Cu/γ-Al2O3 catalysts using coal gas as reductant. The catalysts were characterized by XRD, XPS, BET, and SEM techniques. H2/CO-TPR was recorded to study redox properties of catalysts. With the use of a CO-H2 mixture with different proportions, a series of parallel experiments were performed to investigate the mutual impact and relation of CO and H2. Under optimum conditions, SO2 conversion of 99% and sulfur selectivity of 99% were obtained. The catalyst remained highly active after a long run of 200 h. Process simulation was used to investigate the molecular behavior of catalyst. Combined with in situ infrared characterization, the catalytic mechanism was put forward and verified. |
| Databáze: | OpenAIRE |
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