The transformation of formaldehyde on CoZSM-5 zeolites

✍ Scribed by Kinga Góra-Marek; Jerzy Datka

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 404 KB
• Volume: 137
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.11.005

✦ Synopsis

The interaction of formaldehyde molecules with Co 2+ ions in CoZSM-5 zeolites of various compositions containing various proportions between Co 2+ in exchange positions and in oxide-like clusters, as well as the transformation of formaldehyde sorbed in zeolites was followed by IR spectroscopy. The interaction of formaldehyde with Co 2+ resulted in a weakening of C O bond, what can be partially due to p-back donation of d electrons of Co 2+ to p * antibonding orbitals of formaldehyde. Only Co 2+ in exchange positions (contrary to Co 2+ in oxide-like clusters) were able to interact with formaldehyde. IR studies illustrated also that formaldehyde molecules are oxidized to formate ions, by either Co 3+ or Co 2+ as oxidants. According to IR results Co 3+ and Co 2+ are reduced mostly to Co + and metallic Co.