A1PO-ERI,an aluminophosphate with the ERI framework topology:characterization and structure of the as-made and calcined rehydrated forms

摘要

An aluminophosphate with the ERI framework topology,further denoted A1PO-ERI,has been synthesized in the presence of N,N,N',N'-tetramethyl-1,6-hexanediamine and its structure was solved by single crystal X-ray diffraction.It crystallizes in the monoclinic space group P2(l) (No.4) with a = 13.163(14) A,b = 14.793(15) A,c = 13.215(14) A,beta = 119.74(8)~°.As compared to similar materials prepared with piperidine as template,extraframework hydroxyl groups are locally ordered in the structure.After calcination and rehydration,the aluminophosphate remains monoclinic and crystallizes in space group P2(l) (No.14) witha = 13.283(17) A,b = 14.910(14) A,c = 22.76(3) A and beta =90.19(10)~°.Both the as made and calcined rehydrated forms of A1PO-ERI have been characterized by multidimensional solid state NMR.