Sorption properties of CoAPO-5 single crystals studied by in SITU FT-IR micro-spectroscopy

Jeno Bódis, Georg Müller, Jan Kornatowski, Johannes A. Lercher

Research output: Contribution to journalArticlepeer-review

Abstract

Direct spectroscopic evidence for the existence of Brønsted acid sites in CoAPO-5 single crystal molecular sieves is reported. Compared with unsubstituted AlPO4-5 single crystals, the cobalt substituted samples exhibit well developed bands of isolated bridging hydroxyl groups and a broad absorption band indicating the existence of hydrogen bonded OH groups. Benzene, ammonia and pyridine used as probe molecules interact with the bridging OH groups. For ammonia and pyridine this seems to involve simultaneous interactions with Lewis and Brønsted acid sites. Upon adsorption of pyridine new hydroxyl groups (VOH = 3682 and 3590 cm-1) were observed in parallel to pyridine bonding to Lewis acid sites. This suggests opening of framework metal-oxygen bonds during sorption of pyridine.

Original languageEnglish
Pages (from-to)1119-1126
Number of pages8
JournalRevue Roumaine de Chimie
Volume47
Issue number10-11
StatePublished - 2002

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