以α-MnO₂为活性组分、Ni为金属助剂,通过水热法合成了Ni-MnO₂/Al₂O₃催化剂,在对催化剂进行表征分析的基础上,研究了催化剂的活性及氧化机理。结果表明,通过Ni掺杂后催化剂对硫离子80 min内去除率由50%提高至95%;焙烧再生法可快速再生失活后的催化剂;Ni-MnO₂/Al₂O₃为介孔结构,比表面积高达323.4 m²/g,O_ads/O_latt的比值为2.02,丰富的表面吸附氧和氧空位可以有效提高催化剂的活性;硫离子在氧化过程中生成的中间产物主要是S₂O₃^2-,其次为SO₄^2-和SO₃^2-。

Ni-MnO₂/Al₂O₃ catalyst is synthesized via hydrothermal method by using α-MnO₂ as active component and Ni as metal additive.Based on proceeding characterization and analysis on the catalyst,the activity and oxidation mechanism of the catalyst are investigated.The results show that within 80 minutes,the removal rate of sulfur ions over Ni doped catalyst increases to 95% from 50% that over undoped catalyst.The deactivated Ni-MnO₂/Al₂O₃ catalyst can be regenerated rapidly by roasting regeneration method.Ni-MnO₂/Al₂O₃ has a mesoporous structure with a high specific surface area of 323.4 m²·g^-1 and an O_ads/O_latt ratio of 2.02.Thanks to its abundant surface adsorbed oxygen and oxygen vacancies,the activity of the catalyst is effectively improved.The intermediate products generated during the oxidation of sulfur ions include mainly S₂O₃^2-,followed by SO₄^2- and SO₃^2-.

谭文捷(1980-),女,博士,高级工程师,主要从事油气田污水处理和油气田环境污染防治方面的研究,tanwj.syky@sinopec.com