A mesoporous Pd(II) organometallic catalyst is synthesized by coordinating the Pd(II) with the amine-ligand anchored on ethyl-bridged PMOs. During Barbier reaction in water as an environmentally friendly medium, the as-prepared Pd(II)-PMOs (Et) exhibits matchable catalytic activity and selectivity with the corresponding homogeneous Pd(II) catalyst and could be used repetitively for more than 5 times, which could reduce the cost and even diminish the environmental pollution from heavy metallic ions, showing a good potential in industrial applications. On one hand, the excellent catalytic performance could be attributed to the high surface area and ordered mesporous structure of the PMOs support, which ensures the higher dispersion of Pd(II) active sites and also facilitates the diffusion of reactant molecules. On the other hand, the ethyl fragments embedded in the pore walls could enlarge mesopores and also enhance surface hydrophobility of the PMOs support, which further promotes the diffusion and adsorption of organic molecules, especially in aqueous medium, leading to higher activity and selectivity.
A novel indium-boron (In-B) amorphous alloy was prepared by chemical reduction of indi-À ] in aqueous solution and was applied to the water-medium Barbier-type allylation reactions. A variety of allyl halides could be efficiently added to aldehydes or ketones in water. Additionally, the as-prepared In-B exhibits much higher activity than the commercial In powder and the crystallized In-B owing to the high surface area, the unique amorphous alloy structure, and the high electron density on the In active sites resulting from the strong electronic interaction between the metal In and the alloying B. The yield of target product over the In-B amorphous alloy was similar to that obtained on the homogeneous Pd(II) organometallic catalyst, showing good potential in practical application.
A g-C3N4/TiO2 heterojunction functional foams were constructed as gas purification filter for treating NO indoor gas with high removal rate (> 65 %) and high stability under visible-light (λ ≥...
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