Ordered Mesoporous Silicon Oxynitrides

Abstract

The functionalization of mesostructured and/or mesoporous MCM‐41 related silicas is easily achieved by treatment under NH3 atmosphere at relatively low temperatures without structural collapse. Nitridation, which occurs through a single‐step solid‐state reaction, yields for the first time ordered mesoporous silicon oxynitrides with high surface area (see Figure).

Insights into the Catalytic Activity of Nitridated Fibrous Silica (KCC‐1) Nanocatalysts from 15N and 29Si NMR Spectroscopy Enhanced by Dynamic Nuclear Polarization

“…Similarly, previous studies by conventional NMR techniques did not allow the identification of the silylamine sites in nitridated mesoporous silica. [7][8][9][10][11] Herein, we explain for the first time the decrease of the catalytic activity of nitridated KCC-1 when increasing the nitrogen content. This phenomenon is due to the conversion of primary silylamine sites into secondary ones at T N values greater than or equal to 800 8C.…”

Vapor phase esterification of levulinic acid over ZrO2/SBA-15 catalyst

“…In addition, a diverse broad band of low intensity at ∼280 nm was observed in all the ZrO 2 /SBA15 samples which might be due to the highly distributed ZrO 2 nanoparticles [24,25,29]. Furthermore, an additional band in the vicinity of 230 nm appeared in the UV-vis-DRS patterns of 7ZS and 10ZS samples could be ascribed to the presence of bigger ZrO2 particles (may be below the XRD detection limit) in these samples [26,27,30].…”

Synthesis of Self‐Supported Ordered Mesoporous Cobalt and Chromium Nitrides

“…In fact, the low volume change ratio is essential for the successful nanocasting by using the solid-gas reactions for in situ chemical composition transformation without destroying the mesostructure. [38][39][40][41][42][43][44][45] …”