【摘要】 采用浸渍法制备了不同钒负载量的钒钼钛基催化剂，评价了催化剂的脱硝、SO₂氧化和脱氯苯的性能，并采用BET、XRD、NH₃-TPD、NO-TPD和SO₂-TPD对催化剂进行了表征。结果显示，催化剂活性组分在TiO₂载体表面分散均匀，未发现明显的XRD衍射峰；随着负载量的增加，催化剂脱硝和硫氧化性能逐渐增大，脱氯苯的性能先增大后减小，脱硝活化能较小而脱氯苯的活化能较大，钒负载量为3wt%时催化剂的脱硝脱氯苯性能较佳。催化剂表征显示，随着钒负载量的增加，催化剂比表面积略有下降，表面的酸性略有上升；低温对NH₃的吸附有所增加，而对NO和SO₂的吸附有所下降。低钒负载量时，催化剂表面脱硝可能以L-H机理为主；高钒负载量时，以E-R机理为主。更多还原

【Abstract】 In this paper,vanadium-molybdenum titanium-based catalysts with different vanadium loading were prepared by impregnation method. The performance of the catalysts for de-nitration,SO₂ oxidation and de-chlorobenzene was evaluated. The catalysts were characterized by BET,XRD,NH₃-TPD,NO-TPD and SO₂-TPD. The results showed that the active components of the catalyst were evenly dispersed on the surface of the TiO₂ carrier,and no obvious XRD diffraction peak was found. With the increase of the loading amount,the de-nitration and sulfur oxidation performance of the catalyst gradually increased,and the performance of the de-chlorobenzene increased firstly,and then decreased. The activation energy of the de-nitration was small,while the activation energy of the de-chlorobenzene was large. When the vanadium loading amount was 3wt%,the de-nitration and de-chlorobenzene performance of the catalyst was better. The catalyst characterization showed that with the increase of vanadium loading,the specific surface product of the catalyst decreased slightly,the acidity amount of the surface increased,the adsorption of NH₃ increased at low temperature,and the adsorption of NO and SO₂ decreased. At low vanadium loading,the catalyst surface de-nitration may be dominated by L-H mechanism,while at high vanadium loading,the E-R mechanism is dominant.更多还原