Cobalt-substituted SBA-1 cubic mesoporous molecular sieves have been synthesized in the presence of the cationic surfactant cetyltriethylammonium bromide. UV−vis spectra revealed that the majority of the cobalt ions in the CoSBA-1 samples are present in a highly dispersed state and occupy framework position (Co(II) is present in trigonal pyramidal coordination) in the surface layer of the CoSBA-1 channel walls.
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Vinu et al. (2002) studied this question.
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