Aluminosilicate mesoporous materials (AlMS) were synthesized by two different methods. In “stepwise direct synthesis” of AlMS, sodium aluminate was added at the second ageing after the first ageing of sodium silicate and surfactant mixtures with the purpose of Al incorporation on or near the surface region of the pore wall in order to provide easily accessible ion-exchange sites. Most of the Al atoms in the AlMS prepared by the “stepwise direct synthesis” were present as tetrahedral-coordinated framework in the resulting mesostructured aluminosilicate of hexagonal symmetry. FT-IR spectra of pyridine adsorbed on the AlMS revealed that the AlMS prepared by the “stepwise direct synthesis” had a higher ratio of Brøonsted acid sites to Lewis acid sites than the AlMS prepared by the conventional direct synthesis. Copper ion-exchanged AlMS (Cu/AlMS) catalysts were evaluated for NO reduction by CO. The Cu/AlMS catalyst prepared by the “stepwise direct synthesis” demonstrated catalytic activity for NO reduction without an aggregation of Cu species.
Single Au and Ag nanorods have successfully been formed by the electrodeposition into the pores of anodized aluminum films. Further, Au-Ag alternate nanowires were prepared by cycling the Au- and Ag-electrodeposition. The aspect ratio of the anisotropic particles was tunable by the bath voltage. In the suspension of the single metal nanorods, the surface plasmon bands corresponding to the major and minor axes red- and blue-shifted, respectively, as the aspect ratio increased. On the other hand, in the suspension of the Au-Ag alternate nanowires, only one peak was observed for the major-axis surface plasmon band, while the Au- and Ag-surface plasmon bands were separately present as the minor-axis mode.