Influence of Mg/CTAB ratio on the structural, physicochemical properties and catalytic activity of amorphous mesoporous magnesium silicate catalysts

Abstract

Increasing the magnesium content in direct synthesis will lead to the formation of different magnesium active sites that increase the styrene oxide selectivity under the same reaction conditions.

Subnano-FeOx Clusters Anchored in an Ultrathin Amorphous Al2O3 Nanosheet for Styrene Epoxidation

“…By substituting the value of the slope in Figure S14, the activation energy of the reaction was determined to be 61.34 kJ/mol. This value is comparable to the previously reported value that was from catalytic systems that used acetonitrile, the same solvent as our catalytic experiment. − …”

Mechanistic insights into the co-recovery of nickel and iron via integrated carbon mineralization of serpentinized peridotite by harnessing organic ligands

“…5(a-1)-(d-1)), which indicates the presence of a complex amorphous silica phase containing siloxane Si-O-Si and silanol Si-OH bonds. 61 Evidence of multiple oxygen atom chemistries is also observed by deconvoluting the O 1s spectra shown in Fig. 5(a-2)-(d2).…”

“…A weaker intensity O 1s peak at 530.57 eV is identified as the non-bridging OH-Mg-O-Si serpentine bond, 55 while the O 1s binding energy around 531.4 eV is attributed to tetrahedral silicates in the forsterite surface group. 55,60,61,63,[65][66][67] In Cases I, II, and III, the respective O 1s binding energy peaks at 532.8, 532.61, and 532.65 eV are observed, which are higher than that of standard olivine (531.2 eV). 64,67 This increase in binding energy suggests the presence of electronegative elements in close proximity to oxygen atoms, possibly indicating the existence of a silicon-rich amorphous phase comprising siloxane and silanol components.…”

“…All the spectra are calibrated based on the adventitious carbon C-C (284.8 eV) peak. 60,61 Additional carbon peaks ranging from 286.4 eV to 287 eV are identified as C-O-C and CQO bonds. 61 Peaks observed between 289.5 eV and 289.7 eV are attributed to carbonate (CO 3…”

Recent Investigation on Epoxidation of Styrene with Hydrogen Peroxide by Heterogeneous Catalysis

“…Kok-Hou Tan et al [81] investigated the effect of Mg/CTAB ratio on amorphous mesoporous magnesium silicate catalysts for the oxidation of styrene. The preparation concluded the procedure To begin with, mixed surface directing agent and hexadecyltrimethylammonium bromide together.…”