论文部分内容阅读
制备了钛层柱粘土负载铜催化剂Cu/Ti-PILCs,用于有氧条件下C3H6选择性还原NO反应,考察了焙烧温度对Cu/Ti-PILCs的催化活性、孔结构和表面活性物种状态的影响。500℃焙烧的Cu/Ti-PILCs具有最佳的催化活性。Cu/TiPILCs的孔结构在600℃焙烧温度下具有良好的热稳定性。H2-TPR和SEM显示,在500℃焙烧的Cu/Ti-PILCs上,铜物种高度分散,主要以活性物种Cu2+的形式存在。700℃焙烧引起较小孔的孔结构崩塌,使得催化剂比表面大幅降低,且高温焙烧下Cu/Ti-PILCs形成没有催化活性的铜氧化物团聚体,导致了催化活性的大幅降低。
Titanium pillared clay supported copper catalysts Cu / Ti-PILCs were prepared for selective reduction of NO by C3H6 under aerobic conditions. The catalytic activity of calcination temperature on Cu / Ti-PILCs, the pore structure and the state of surfactant species influences. The Cu / Ti-PILCs calcined at 500 ℃ have the best catalytic activity. The pore structure of Cu / TiPILCs has good thermal stability at 600 ℃ calcination temperature. H2-TPR and SEM showed that copper species were highly dispersed on Cu / Ti-PILCs calcined at 500 ℃, mainly in the form of Cu2 +. At 700 ℃, the pore structure of the smaller pores collapsed causing the specific surface area of the catalyst to decrease drastically, and Cu / Ti-PILCs were calcined at high temperature to form copper oxide agglomerates without catalytic activity, resulting in a drastic reduction of catalytic activity.