Intercalation of niobium and tantalum M/sub 6/Cl/sub 12//sup n+/ cluster cations in montmorillonite: a new route to pillared clays

Journal Article · Wed Apr 10 00:00:00 EST 1985 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00202a022· OSTI ID:5274203

Christiano, S P; Wang, J; Pinnavaia, T J

A new synthetic route to pillared clays is described that is based on the intercalation and subsequent oxidation of metal cluster cations in montmorillonite. Niobium and tantalum clusters of the type M/sub 6/Cl/sub 12//sup n+/ (n = 2, 3) are shown to bind to the clay by ion exchange for interlayer sodium. The maximum cluster loading is larger than expected on the basis of formal cation charge and clay ion-exchange capacity, indicating that reduction of cluster charge occurs through hydrolysis on the intracrystal surfaces. The intercalated products exhibit regular basal spacings of 18.4 +/- 0.2 A (M = Nb) and 18.9 +/- 0.5 A (M = Ta). Oxidation of the intercalated cluster cations by water at 240/sup 0/C results in the in situ formation of metal oxide aggregates that function as molecular size pillars. The niobium and tantalum oxide pillared clays exhibit basal spacings of 19.9 +/- 0.5 A and are thermally stable to 400/sup 0/C.

• Research Organization: Michigan State Univ., East Lansing
• OSTI ID: 5274203
• Journal Information: Inorg. Chem.; (United States), Vol. 24:8
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
MONTMORILLONITE
CLATHRATES
SYNTHESIS
NIOBIUM CHLORIDES
TANTALUM CHLORIDES
CHLORIDES
CHLORINE COMPOUNDS
CLAYS
HALIDES
HALOGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
NIOBIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties