硒掺杂对钒催化剂低温活性的影响
发布时间：2018-08-17 18:06
【摘要】：利用超声浸渍法制备硒掺杂前后的钒催化剂V/SiO_2和Se-V/SiO_2,采用Raman、XRD和TG/DSC对催化剂进行分析表征,并测定了两组催化剂对SO_2氧化制SO3性能的影响。结果表明,与V/SiO_2相比,硒掺杂后钒催化剂Se-V/SiO_2的活性组分颗粒尺寸减小,分散度增大,提供的活性位点增多,且降低了催化剂组分的熔融相变温度,这些作用有利于该催化剂在较低温度下反应物分子的吸附与活化,提高其催化活性。使得在480℃以下,催化剂Se-V/SiO_2催化SO_2氧化的转化率明显高于V/SiO_2。
[Abstract]:The vanadium catalysts V/SiO_2 and Se-V / SiO-2 were prepared by ultrasonic impregnation method. The catalysts were characterized by Raman V/SiO_2 and TG/DSC, and the effects of the two groups of catalysts on the oxidation of SO_2 to SO3 were measured. The results show that, compared with V/SiO_2, the active component particle size of Se-V/SiO_2 decreases, the dispersity increases, the active sites are increased, and the melting phase transition temperature of the catalyst component decreases after se doping. These effects are beneficial to the adsorption and activation of the reactants at lower temperature and improve their catalytic activity. Under 480 鈩，
本文编号：2188458
[Abstract]:The vanadium catalysts V/SiO_2 and Se-V / SiO-2 were prepared by ultrasonic impregnation method. The catalysts were characterized by Raman V/SiO_2 and TG/DSC, and the effects of the two groups of catalysts on the oxidation of SO_2 to SO3 were measured. The results show that, compared with V/SiO_2, the active component particle size of Se-V/SiO_2 decreases, the dispersity increases, the active sites are increased, and the melting phase transition temperature of the catalyst component decreases after se doping. These effects are beneficial to the adsorption and activation of the reactants at lower temperature and improve their catalytic activity. Under 480 鈩，
本文编号：2188458
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