Shape-Selective Adsorption of Substituted Benzaldehyde Isomers by a Molecular Sieving Silica Overlayer Prepared by the Chemical Vapor Deposition Method Using Organic Template on Tin Oxide

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Abstract The chemical vapor deposition of a silica overlayer in the presence of template molecules was examined on tin oxide in order to construct surface cavities with a molecular sieving property. On a SiO2/SnO2 sample prepared using a benzaldehyde template, 4-chlorobenzaldehyde and 4-methylbenzaldehyde were adsorbed, while 2-chlorobenzaldehyde and 2-methylbenzaldehyde were not adsorbed. The adsorption of 3-chlorobenzaldehyde was controlled by the thickness of the layer, i.e., the depth of the cavity. It was adsorbed by a shallow cavity, but not by a deep cavity. Thus the shape selectivity due to the shapes of the adsorbate molecule and the cavity was obtained.