Controlled synthesis and catalytic properties of mesoporous nickel-silica core-shell microspheres with tunable chamber structures

Release time:2023-10-19 Hits:

Key Words:Composites; Microporous materials; Nanostructures; Chemical synthesis; Catalytic properties

Abstract:In 550 degrees C and H-2 current, the mesoporous nickel-silica composite core-shell microspheres with tunable chamber structures have been successfully prepared by reduction of Ni3Si2O5(OH)(4) microspheres, which are synthesized by the reaction between Ni(Ac)(2)center dot 4H(2)O and SiO2 microspheres via a self-template approach. The chamber (SiO2 core sizes) and shell thickness (40-150 nm) of the nickel-silica microspheres can be controlled by adjusting the synthetic parameters of Ni3Si2O5(OH)(4), such as the reaction time. After reduction, these microspheres still have the same sizes, morphologies, and core-shell structures with porous shell as before. These mesoporous nickel-silica microspheres with large BET surface area, exhibit good catalytic activity in m-dinitrobenzene (m-DNB) and high selectivity of m-phenylenediamine (m-PDA) after 3.5 h, but different selectivity of m-PDA in the progress, showing good potential in the catalyst industry. (C) 2012 Elsevier Ltd. All rights reserved.

Volume:47

Issue:9

Translation or Not:no