1 Contributions of Acid and Metal Sites to Propane Aromatisation over Fresh Ga, H-ZSM-5 Catalyst Fri Aug 24, 2012 11:41 pm
Hội Viên Mới
Equipments
The enhancement of aromatisation activity on Me, H-ZSM-5 catalyst was attributed to the appearance of active metal sites as Lewis sites after the introduction of metal species into the zeolite.
A kinetic modelling has been developed to describe the aromatisation of propane over fresh H-ZSM-5 and Ga, H-ZSM-5 catalysts at 500oC. It was shown that the introduction of metal into H-ZSM-5 has enhanced both the yield and selectivity of aromatics and that the conversion of propane is mainly due to the dehydrogenation step over metal sites. Over Ga, H-ZSM-5 catalyst, the contribution of hydrogen transfer steps (between the feed alkane and alkenes adsorbed over acid sites) to the conversion of alkane is reduced considerably. On the other hand, the formation of aromatics is mainly from aromatisation steps over metal sites. As a result of the alkane dehydrogenation and alkene aromatisation steps over metal sites, the hydrogen yield is observed to increase in comparison with the hydrogen yield for the transformation over H-ZSM-5.
http://www.vpi.pvn.vn/upload/file/TapChiDauKhi/NHLuong.pdf
A kinetic modelling has been developed to describe the aromatisation of propane over fresh H-ZSM-5 and Ga, H-ZSM-5 catalysts at 500oC. It was shown that the introduction of metal into H-ZSM-5 has enhanced both the yield and selectivity of aromatics and that the conversion of propane is mainly due to the dehydrogenation step over metal sites. Over Ga, H-ZSM-5 catalyst, the contribution of hydrogen transfer steps (between the feed alkane and alkenes adsorbed over acid sites) to the conversion of alkane is reduced considerably. On the other hand, the formation of aromatics is mainly from aromatisation steps over metal sites. As a result of the alkane dehydrogenation and alkene aromatisation steps over metal sites, the hydrogen yield is observed to increase in comparison with the hydrogen yield for the transformation over H-ZSM-5.
http://www.vpi.pvn.vn/upload/file/TapChiDauKhi/NHLuong.pdf