1 Introduction To study the acidic properties of Y-type zeolites has important meaning in the field of zeolite catalysis. The nature and numbers of active sites of Y-zeolites can be modified by dealumination and rare ...1 Introduction To study the acidic properties of Y-type zeolites has important meaning in the field of zeolite catalysis. The nature and numbers of active sites of Y-zeolites can be modified by dealumination and rare earth ion exchange to increase the catalytic activity and stability of modified Y-zeolites. In view of the zeolite structure,the origin of strong acid sites is due to the change of the density and distribution of the framework aluminum atoms, which results in the increasing of the isolated framework aluminum atoms or those with no展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘1 Introduction To study the acidic properties of Y-type zeolites has important meaning in the field of zeolite catalysis. The nature and numbers of active sites of Y-zeolites can be modified by dealumination and rare earth ion exchange to increase the catalytic activity and stability of modified Y-zeolites. In view of the zeolite structure,the origin of strong acid sites is due to the change of the density and distribution of the framework aluminum atoms, which results in the increasing of the isolated framework aluminum atoms or those with no
