A simple one pot synthesis of mesoporous silica hosted silver catalyst and its low-temperature CO oxidation

• Direct synthesis calcination method was developed to synthesize Ag nanoparticles.
• Highly dispersed uniformly sized Ag nanoparticles were supported on silica.
• DDA was a key factor in obtaining ordered support and dispersed silver particles.
• High activity in CO oxidation (T98%=20 °C) was obtained.

A novel and simple one pot synthesis approach using dodecylamine (DDA) as capping agent and structure director has been employed to synthesize the silica-supported Ag nanoparticles. The catalysts were characterized by XRD, N2 adsorption–desorption isotherms, TEM and TG-DTA. It was found that the loading and particle size of Ag were strongly related to the surfactant DDA. In addition, the formed local reductive environmental due to the decomposition of DDA during thermal treatment procedure could prevent the aggregation of Ag nanoparticles and be benefit for the formation of uniformly dispersed Ag nanoparticles on the HMS support (1.5–4.5 nm). The excellent catalytic activity for CO oxidation (T98(CO) = 20 °C) demonstrated that the method was effective for synthesizing the highly dispersed nano-silver catalyst.

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