Collect. Czech. Chem. Commun. 2001, 66, 567-574

Uniformity and Ordering of Inner Walls of (Al)MCM-41

Jiří Dědeček*, Naděžda Žilková and Jiří Čejka

J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague 8, Czech Republic


The uniformity and ordering of the surface of (Al)MCM-41 channel walls was investigated employing bare Co(II) ions as probes. VIS spectra of Co(II) ions evidenced the presence of two types of uniform cationic sites in dehydrated Co-(Al)MCM-41 in a wide range of Si/Al/Co chemical composition (Si/Al = 11-76, Co/Al = 0.08-0.44). These cationic sites represent centers of two types of uniform domains, containing in minimum 18 surface T atoms, present on the surface of the channel walls of (Al)MCM-41. These domains represent majority of the inner surface of the (Al)MCM-41 molecular sieve.

Keywords: Mesoporous materials; Molecular sieves; (Al)MCM-41; VIS spectroscopy; Co(II) ions; Heterogeneous catalysis.

References: 16 live references.