Preparation of aluminophosphate molecular sieves in the presence of nickel( II) and copper( II)
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Nickel(ll)-substituted aluminophosphates of structure types 21 and 12 (NiAPO-21 and NiAPO-12) have been prepared hydrothermally in the presence of ethylenediamine as the template. U.v.-visible spectroscopy of NiAPO-21 suggests that Ni(ll) replaces hexacoordinated aluminum of the AIP04-21 framework and is octahedrally coordinated by the 0 atoms of the aluminophosphate skeleton and also by H20 and en molecules. It has also been found that in the presence of copper no aluminophosphate-type products can be obtained.
Keywords:NiAPO-12 / NiAPO-21 / Ni(II) coordination / molecular sieves / organic template
Source:Zeolites, 1991, 11, 6, 612-616