2003•Acta Petrolei Sinica(Petroleum Processing Section)Requires access
MeZrAPO-5 MOLECULAR SIEVES AS SOLID ACID CATALYSTS IN LINEAR ALKYLBENZENE SYNTHESIS II. Structure and Physico-Chemical Properties of the Catalysts
Lian Pi-yong
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Abstract
A new kind of zirconio-aluminophosphate molecular sieves(MeZrAPO-5) as solid acid catalysts in alkylation of benzene with linear olefins was characterized by XRD, FT-IR, MAS NMR, NH_3-TPD and TDA. The results indicated that the MeZrAPO-5 molecular sieves had the same structure as AlPO_4-5 in which Zr and one or two of B,Si,Ga,Ge,Fe,Sn and Mg were isomorphously substituted. The isomorphous substitution resulted in increased activity and produced B acid sites. The treatment with acid was able to further increase the acidity of the MeZrAPO-5 molecular sieves. The MeZrAPO-5 molecular sieves possessed good thermal stability and the collapse temperature of framework was higher than 1000℃.