Development in researeh of n-heptane isomerization over heteropolyacid-metal bifunctional catalysts

Mechanism of the isomerizations over bifunetional catalysts is briefly introduced,the research progress of n-heptane isomerizationover over heteropolyacid-metal bifunctional catalysts which are supported in MCM-41,SiO2,USY,ZrO2,TUD-1 and β zeolite,is summarized.Influencing factors of these catalysts and their catalytic performance in n-heptane isomerizations are reviewed including surface acidity,pore structure,contents of heteropolyacid,metal content,and reaction condition,etc.Merit and demerit of these heteropolyacid-metal bifunetional catalysts are summarized and development trends for these catalysts in the future are predicted.