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Rare earth metals modified Ni-S_2O_8~(2-)/ZrO_2-Al_2O_3 catalysts for n-pentane isomerization

Hua Song;Lele Zhao;Na Wang;College of Chemistry & Chemical Engineering,Northeast Petroleum University;Provincial Key Laboratory of Oil & Gas Chemical Technology,College of Chemistry & Chemical Engineering,Northeast Petroleum University;  
The effects of adding rare earth(RE) metals,such as Ce,Yb and Pr to Ni-S_2O_8~(2-)/ZrO_2-Al_2O_3(Ni-SZA) on the structure of catalysts as well as their isomerization performance were studied.The prepared catalysts were characterized by XRD,BET,FT-IR,Py-IR,and H_2-TPR,The results showed that the addition of RE metals can increase the strength and amounts of the acid sites,improve the redox properties of catalysts.The Yb-Ni-SZA catalyst showed the best redox properties,which could provide enough metallic sites.In addition,it provided the largest amounts of weak and moderately strong acid sites.Among RE metals modified Ni-SZA catalyst,Yb-Ni-SZA exhibited the highest isopentane yield of 61.7%at 160 °C.The optimum isomerization catalytic performance of the catalysts decreased in the order of Yb-Ni-SZA Pr-Ni-SZA Ni-SZA Ce-Ni-SZA.
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