Si-29 MAS NMR and Raman spectroscopy studies of synthetic microporous (Zr,Hf)-umbite
authors Lin, Z; Rocha, J
editors Cejka, J; Zilkova, N; Nachtigall, P
nationality International
journal MOLECULAR SIEVES: FROM BASIC RESEARCH TO INDUSTRIAL APPLICATIONS, PTS A AND B
keywords SILICATES
abstract Solid Solutions of synthetic analogues of the microporous mixed tetrahedra-octahedra mineral umbite K-2[(Zr1-xHfx)Si3O9](H2O)-H-. (x = 0, 0.17, 0.33, 0.5, 0.67, 0.83 and 1) have been Successfully prepared via hydrothermal synthesis. The materials have been characterised by Si-29 magic-angle spinning (MAS) NMR and Raman spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). Si-29 MAS NMR provides clear evidence for the framework substitution of Hf or Zr, which is not forthcoming from other techniques. The hafnium content, x, may be estimated from the intensity of the Si-29 MAS NMR resonances and Raman shifts of bands in the range 880-1000 cm(-1).
publisher ELSEVIER SCIENCE BV
issn 0167-2991
isbn 0-444-52082-1
year published 2005
volume 158
beginning page 861
ending page 868
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000234827500109
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