Title of article :
Study on antimony oxide self-assembled inside HZSM-5
Author/Authors :
Bin Li، نويسنده , , Shijie Li، نويسنده , , Yingxia Wang، نويسنده , , Neng Li، نويسنده , , Xiyao Liu، نويسنده , , Bingxiong Lin، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
Sb/ZSM-5 was obtained by solid-state reaction with the mixture of Sb2O3 and zeolite HZSM-5 under a dry nitrogen flow at 773 K. Characterization of the treated zeolite was undertaken with XRD, 27Al MAS NMR, BET, TGA and FT-IR. The results revealed that part of the antimony oxides migrated into the channels of zeolite, and decreased the Brönsted acid sites in Sb/ZSM-5 remarkably. The other part of antimony oxides together with the amorphous alumino-silicate in the products distributed on the external surface of zeolite ZSM-5 and modified it, while the framework of ZSM-5 in crystal phase was retained. The structure of occluded antimony oxide inside the channels of ZSM-5 was studied by XRD Rietveld method. The result showed that their structure can be described as a chain of non-perfect [Sb5O5(H2O)2]n5n+, which is parallel to the straight channel of ZSM-5. There is about 0.6 [Sb5O5(H2O)2]5+ unit in every cell of the ZSM-5 on an average.
Keywords :
Antimony oxide , Zeolite HZSM-5 , Self-assembled , XRD Rietveld method
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY
Journal title :
JOURNAL OF SOLID STATE CHEMISTRY