Metal clusters made of neighbouring metal centers with unique structures and stabilizedon a support may provide well-defined heterogeneous catalysts.The idea of constructingthese metal clusters in zeolite cages has be...Metal clusters made of neighbouring metal centers with unique structures and stabilizedon a support may provide well-defined heterogeneous catalysts.The idea of constructingthese metal clusters in zeolite cages has been coined as synthesis by a “ship-in-bottle” technique.Here,we report on the structural characterization and chemisorption behavior of NaY zeolite展开更多
A series of Mo-impregnated H\%β\% samples, with MoO\-3 loading in H\%β\% zeolite in the mass fraction range of 0\^5%\_6\^0%, were studied by means of XRD and IR in order to characterize their structures. Mo/H\%β\% ...A series of Mo-impregnated H\%β\% samples, with MoO\-3 loading in H\%β\% zeolite in the mass fraction range of 0\^5%\_6\^0%, were studied by means of XRD and IR in order to characterize their structures. Mo/H\%β\% samples′ crystallinity almost linearly decreases with increasing the amount of MoO\-3 loaded. The IR spectra and XRD patterns suggest that the progressive destabilization of the H\%β\% zeolite structure is caused by increasing Mo loading in (MoO\-3+H\%β\% zeolite). During the calcination, Al\-2(MoO\-4)\-3 formed from the dealumination of H\%β\% zeolite, causes the substantially partial breakdown of the zeolite framework when the Mo loading in MoO\-3+H\%β\% is relatively high.展开更多
文摘Metal clusters made of neighbouring metal centers with unique structures and stabilizedon a support may provide well-defined heterogeneous catalysts.The idea of constructingthese metal clusters in zeolite cages has been coined as synthesis by a “ship-in-bottle” technique.Here,we report on the structural characterization and chemisorption behavior of NaY zeolite
基金Supported by the National Natural Science Foundation of China(No.2 0 30 30 19) and the National"973"Project of China(No.2 0 0 3CB6 15 80 2 )
文摘A series of Mo-impregnated H\%β\% samples, with MoO\-3 loading in H\%β\% zeolite in the mass fraction range of 0\^5%\_6\^0%, were studied by means of XRD and IR in order to characterize their structures. Mo/H\%β\% samples′ crystallinity almost linearly decreases with increasing the amount of MoO\-3 loaded. The IR spectra and XRD patterns suggest that the progressive destabilization of the H\%β\% zeolite structure is caused by increasing Mo loading in (MoO\-3+H\%β\% zeolite). During the calcination, Al\-2(MoO\-4)\-3 formed from the dealumination of H\%β\% zeolite, causes the substantially partial breakdown of the zeolite framework when the Mo loading in MoO\-3+H\%β\% is relatively high.
