Activity of Metal Ion-Exchanged Fluorotetrasilicic Mica

Catalytic Activity of Metal Ion-Exchanged Fluorotetrasilicic Mica 

Methanol conversion was adopted as a probe reaction to explore the catalytic activity of M -TSM, because methanol is a simple molecule that transforms into easily assignable compounds and is converted into different products through different routes employing different catalysts. Methanol is decomposed into carbon monoxide and hydrogen over metal catalysts [including Ni (77)], is dehydrogenated into formaldehyde or methyl formate over Zn- or Cu-containing catalysts (78), and is dehydrated into dimethyl ether and successively into hydrocarbons over acid catalysts (79). 

Catalytic Activity of Metal Ion-Exchanged Fluorotetrasilicic Mica for the Reaction of  

A survey of the reactions of methanol and butene over a series of M -TSMs leads us to note two common features. First, no activity is observed with some M -TSMs, indicating that the silicate sheet of TSM is catalyti-cally inactive. Second, M -TSM does not follow the clear activity sequence that is frequently noted in acid catalysts, of which the surface acidity is changed by the inductive effect of metal ions (27, 22). These features strongly suggest that the direct interaction between a substrate and the interlayer metal ion is responsible for the catalysis by M -TSM, namely, M -TSM acts as an immobilized metal ion catalyst. 

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