Coordination and properties of cobalt in the molecular sieves CoAPO-5 and -11

• Published in: Microporous and mesoporous materials Vol. 37; no. 1; pp. 117 - 127
• Main Authors: SPONER, J, CEJKA, J, DEDECEK, J, WICHTERLOVA, B
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.05.2000; Elsevier
• Subjects: AlPO 4; Chemistry; Co ions; CoAPO-11; CoAPO-5; Exact sciences and technology; General and physical chemistry; Ion-exchange; Molecular sieves; Other ion exchangers: preparations and properties; Redox sites; Surface physical chemistry; Co ions; CoAPO-11; CoAPO-5; Redox sites; AlPO 4; Molecular sieves; Water; Diffuse reflection; Cobalt ion; Visible spectrometry; Experimental study; Ultraviolet spectrometry; Molecular sieve; Calcining; Operating conditions; Reflection spectrometry; Near infrared spectrometry; Chemical coordination; Amine; Adsorption; Ligand field; Aluminium phosphate; Modified material

Diffuse reflectance electronic spectra have been utilized to investigate the local geometry of cobalt centers substituted in the three-dimensional framework of CoAPO-5 and -11 molecular sieves. Structural changes induced by calcination in an oxidative atmosphere, evacuation and hydrogen treatment, a...