A series of AuPd@SiO2 core-shell mesoporous nanoparticles with different Au/Pd ratio were successfully synthesized by a two-step method. The surfactant capped AuPd alloy nanoparticles were coated with meoporous SiO2 through hydrolysis of tetraethylorthosilicate(TEOS). The as-synthesized AuPd@SiO2 core-shell nanoparticles with about 4 nm AuPd heteroaggregate nanoparticle cores and about17 nm silica shells were calcined at 500 oC to remove TTAB surfactants and subsequent H2 reduction at 300 oC to obtain AuPd@SiO2 core-shell mesoporous nanoparticles. The results of relevant characterizations such as XRD, TEM and BET revealed that the AuPd@SiO2 nanocatalysts were highly stable during thermal treatment and H2 reduction when under the protection of SiO2 shells. A series studies of the hydrogenation of p-Chloronitrobenzene(p-CNB) with H2 were tested for Au@SiO2, AuPd5@SiO2, AuPd10@SiO2, Au10Pd@SiO2, Au5Pd@SiO2, AuPd@SiO2, Pd@SiO2 nanacatalysts respectively, and the results showed that the Au-Pd interaction had dramatic influence on both conversion and selectivity performance of AuPd@SiO2 nanocatalysts.

Building up AuPd@m-SiO2 nanocatalyst with alloyed noble metal core and mesoporous silica shell structure: Designed composite for enhanced p-chloronitrobenzene hydrogenation selectivity

256th National Meeting (2018)

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