One-pot synthesis of iron doped mesoporous silica catalyst for propane ammoxidation

Abstract

Iron doped hexagonal mesoporous silica (Fe-HMS) was successfully prepared by one-pot direct synthesis at ambient temperature by using dodecylamine as a templating agent. The catalyst has been characterized by various techniques including XRD, DR-UV-Vis, FTIR, SEM and N2 adsorption. The obtained material exhibits very large surface area (above 1000 m(2) g(-1)), mesoporosity with narrow distribution of pores (around 4 nm) and nano-crystallites with the 20-30 nm in size. The concentration of iron in the catalyst was 0.95 wt%. The prepared material was tested in the direct ammoxidation of propane. It was shown that direct synthesis leads to better dispersion of the metal compared to the material prepared by impregnation of pure HMS silica. It is also demonstrated that this material is able to catalyze the direct ammoxidation of propane and shows quite high selectivity to acrylonitrile (52% at 11% conversion of propane).

Influence of drying technique on physicochemical properties of bimodal meso-macropore structure of silica support

“…In addition, it was clearly noticed that the isotherm for freeze dried silica support exhibited significant difference hysteresis loop, which corresponded to the composite isotherm type IV-II. The sharp increase of N2, at relative pressure range of 0.8 to above 0.9, indicated the presence of large meso-macropores or interparticle adsorption and condensation [3,12].…”

Extending the Adaptive Network Nanomedicine Model for Homeopathic Medicines: Nanostructures as Salient Cell Danger Signals for Adaptation

“…In addition to small amounts of source material NPs, the more prevalent silica NPs would include source-doped nanosilica or silica-shell/source-core NPs, together acting as nanosilica-amplified immune adjuvant [36,53,55,56,121], sub toxic metabolic stressors [80,285], nanocatalysts [117,286], and/ or nanomaterial-induced exogenous danger signals triggering a cell danger response [253]. The clinically reported extended duration of evolving responses to a given HM dose [214] in multiple bodily systems across the organism [287] would reflect the interconnected self-organizing state of the organism and capacity for nonlinear amplification and change [202].…”

Synthesis of Amine Functionalized Mesoporous Silicas Templated by Castor Oil for Transesterification

“…Synthesis of mesoporous silica materials have attracted attention due to their properties which support a variety of applications [9][10][11]. Mesoporous solid supports are typically synthesized via non-renewable petroleum-derived polyol or alkylamine surfactant templates such as pluronic P123, cetyltrimethylammonium bromide and dodecylamine [12][13][14]. However, these artificial surfactants are expensive, harmful to the environment, toxic and not easily available.…”