SiO₂-Encapsulated Ag/WO₃ Nano-architectures for Azoxybenzene Production via Simultaneous Activation of Aniline and Molecular O₂

Abstract

Nanocomposites Ag/WO3 intercalated within the channels of the silica network have been developed using a surfactant-assisted hydrothermal process. Structural and morphological studies indicated that the material exhibited two-dimensional type enchiladas-like nanoarchitectures. Higher-resolution electron microscopy results demonstrated that twinned Ag nanoparticles supported on WO3 units were embedded within the stacked layers of silica without agglomerating. This unique morphology led to higher dispersion of the Ag/WO3 framework that compelled the availability of more exposed surface-active Ag(111) sites, which triggered the activation of molecular O2 in furnishing a high yield of azoxybenzene, and this phenomenon has been explained in the light of DFT.

MCM‐41@CPTMS as an Efficient and High‐Performance Catalyst for One‐Pot Construction of Indeno[1,2‐b]quinolin‐8‐one Derivatives**

“…The surface of this catalysts Silica has specific advantages as support such as excellent thermal and chemical stability, ease of handling and profusion of exposed silanol (SiÀ OH) groups. [5][6][7][8][9] Furthermore, the rigid structure of silica does not allow it to swell in solvents; this makes silica usable both at high and low temperatures and at high pressures. Its very inflexibility an MCM-41 mesoporous silica with active mesoporous sites was introduced by Mobil scientists in 1992.…”