【摘要】 用不同的交联剂溶液与钠基土进行交联反应,合成了不同交联粘土(Al-PILC、Zr-PILC、Ti-PILC)。以合成的交联粘土作为载体负载Cu及其它金属活性组分,考察了富氧条件下C3H6选择性还原NO反应的催化活性。与Cu/Al-PILC、Cu/Zr-PILC相比,Cu/Ti-PILC显示了很好的低温活性和较宽的活性温度范围。Cu的负载方法影响催化剂活性,浸渍法制备的催化剂比离子交换法制备的催化剂活性好。用N2吸附等温线、孔径分布以及漫反射红外光谱研究了交联过程及活性组分的负载对交联粘土结构的影响。钠基土经TiO2交联柱撑后,孔结构和孔径分布有了很大的改变,比表面积和孔容大幅增加。负载活性组分Cu没有改变Ti-PILC的孔结构,只是减少了比表面和孔容。漫反射红外光谱研究发现,经TiO2柱撑后,粘土结构羟基减少,交联剂与粘土结构羟基发生了交联作用。更多还原

【Abstract】 Different pillared clays (Al-PILC, Zr-PILC, Ti-PILC) were synthesized from Na-Mt (sodium-base montmorillonite) and their performances used as the catalytic supporter were studied. The experiments show that, among them, the Ti-PILC is the most suitable to be used as the supporter for the catalyst used for the selective catalytic reduction of NO by propylene. Then seven kinds of catalysts, such as Cu/ Ti-PILC, Ag/ Ti-PILC, Ni/ Ti-PILC, Zn/ Ti-PILC, Co/ Ti-PILC, Ce/ Ti-PILC and Fe/ Ti-PILC were prepared respectively by loading the active component of different corresponding metals on the Ti-PILC, and their catalytic activities were studied respectively, too. The results show that, among them, the Cu/Ti-PILC has the highest catalytic activity at a relative low temperature, and using it, the NO conversion can reach 68.1% at 250℃. The studies also show that the Cu loading method has influence on the activity of the catalyst prepared. The Cu/Ti-PILC, catalyst prepared by the method of incipient wetness impregnation, has higher catalytic activity than that of Cu-Ti-PILC, catalyst prepared by the method of ion-exchange. According to the N2 adsorption isotherms and by using DRIFTS, the influence of pillaring process on the pore size distribution of the clay and the effects of the copper loading on the structure of the pillared clay were studied. The pillaring process changes the pore structure of the clay and also changes the pore size distribution, at the same time the specific surface area of the clay is increased too. The copper loading doesn’t change the pore structure of the Ti-PILC and only decreases the specific surface area and the pore volumes of the pillared clays.更多还原