Abstract
CrAPO-5 molecular sieves were synthesized hydrothermally starting with different Cr precursors and
Cr and template contents. The behavior of Cr was investigated spectroscopically by diffuse reflectance
spectroscopy (d.r.s.) and electron spin resonance (e.s.r.). In the gels, Cr 3+ and Cr 8+ are present as,
respectively, octahedral Cr(H20) 3+ and mainly dichromate. Both ions
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