The ever-increasing amount of anthropogenic carbon dioxide (CO2) emissions has resulted in great environmental impacts, the heterogeneous catalysis of CO2 hydrogenation to methanol is of great significance.

Melt derived 45S5 Bioglass(R) has been studied for more than 25 years. Bioglass(R) has excellent biocompatibility, and its surface reactivity has contributed to its clinical success over the past 10 years. Recently, porous bioactive glasses have been derived through sol-gel processing in an attempt to increase the specific surface area, and, thus, the surface reactivity and degradability of the material. This allows the material to be replaced ultimately by natural tissue while it stimulates bone regeneration. In this work, the processing and properties of these sol-gel bioactive glasses are discussed, and a new drying method and treatment is described to make homogeneous particulate and monoliths on a production scale.

The efficient utilization of biomass, the only globally available, renewable and abundant carbon-neutral source, is of high significance in green and sustainable chemistry. Polyoxometalates (POMs) and POM-based composites have been...

The selective hydrogenation of phenol and related derivatives to the corresponding cycloketones requires rationally designed catalysts, which have attracted significant attention.

This study demonstrated that a dentifrice containing NovaMin significantly improves oral health as measured by a reduction in gingival bleeding and reduction in supragingival plaque compared with a negative dentifrice over the 6 weeks study period.

It is an urgent desire to shed insight into the structure–activity relationship of catalysts for stoichiometric methane combustion, a very important reaction in energy utilization and environmental governance. Here, we report variedly sized Pd nanoparticles (NPs) (2.1–10.4 nm) on gamma-alumina by a one-step colloid synthesis method for stoichiometric methane combustion. The results of structural analysis based on transmission electron microscopy and in situ diffuse reflectance infrared Fourier transform spectroscopy show that, with increasing size, Pd NPs evolve their shape from irregular to spherical-like structure along with a progressively decreased fraction of Pd corner sites. Moreover, the intrinsic catalytic activity (turnover frequency) of Pd NPs for methane combustion monotonously decreases by about 6-fold when the size of Pd NPs increases from 2.1 to 10.4 nm, suggestive of a protuberant size-dependent activity of Pd catalyst in this reaction. Further confirmed by the potential energy profiles of the rate-determining step in the reaction from density functional theory calculations, the methane molecule is much easier to be activated on corner sites than on the other sites (i.e., edge and terrace sites) over Pd NPs. This work elucidates the origin of size-dependent activity of Pd catalysts via an investigation on their surface structure and could help to engineer highly efficient catalysts for this reaction.

A series of acidic cesium salts of molybdovanadophosphoric heteropolyacids (CsMVP‐HPAs) are developed as bifunctional and recyclable catalysts for a one‐step approach to 2,5‐diformylfuran (DFF) from fructose with molecular oxygen as the oxidant under environmentally benign conditions. The CsMVP‐HPAs afford the direct synthesis of DFF from fructose through acidic site (H)‐promoted fructose dehydration and metallic site (V)‐catalyzed successive aerobic oxidation of 5‐hydroxymethylfurfural (HMF). The catalytic performances of CsMVP‐HPA toward fructose dehydration and HMF oxidation are related to its acid density and V content, respectively. Moreover, the increase in the V content of CsMVP‐HPA results in its decreased acid density, which suggests its converse catalytic performance toward fructose dehydration and HMF oxidation. An optimum balance between the dehydration and oxidation functions of CsMVP‐HPAs reveals that a ratio of acid density to molar concentration of V between 1.64 and 3.34 achieves a maximum yield of 60 % for DFF from fructose with Cs3HPMo11VO40 as a catalyst under atmospheric pressure of oxygen. Moreover, Cs3HPMo11VO40 behaves as a heterogeneous catalyst and can be easily reused at least for four times. This research highlights an efficient bifunctional catalyst for transforming renewables into fine chemicals in tandem reactions of dehydration and oxidation.

The synthesis and catalytic applications of nano-hierarchical SAPO-34 for MTO conversion have received great significance.