Facile fabrication of hollow hydridosilica nanoparticles with mesoporous shell and their dual effect in Pd nanoparticles immobilization

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2014-03, Vol.240, p.161-168
• Main Authors: Li, Na, Du, Jingjing, Xu, Lijian, Xu, Jianxiong, Chen, Tie-hong
• Format: Article
• Language: English
• Subjects: Agglomeration; Catalysts; Cationic; Fluorocarbon surfactant; Hollow mesoporous spheres; Hydridosilica; Hydrogenation; Immobilization; Nanoparticles; Palladium; Pd nanoparticles; Shells; Surfactants
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2013.11.044

Hollow hydridosilica nanoparticles with mesoporous shell were synthesized employing complex micelle of cationic fluorocarbon surfactant and nonionic triblock copolymer P123 as template and triethoxysilane as silica precursor. The obtained hollow hydridosilica nanoparticles were successfully used as both reducing agent and scaffold for Pd nanoparticles immobilization due to the inherent hydride sites within the hollow hydridosilica nanoparticles. [Display omitted] •One simple route for the synthesis of HMHNs with mesoporous shell is reported.•Immobilization of Pd is achieved by using HMHNs as the reducing agent and scaffold.•The as-prepared heterogeneous Pd catalyst shows efficient catalytic performance. Synthesis of hollow hydridosilica nanoparticles with mesoporous shell (HMHNs) employing a mixture of cationic fluorocarbon surfactant (FC-04) and nonionic triblock copolymer surfactant (P123) as template and triethoxysilane as silica precursor is reported. It is found that the content of the FC-04 in the surfactant mixture greatly influences the aggregation state of the FC-04 and P123 surfactant template and therefore influences the morphology of the synthesized hydridosilica nanoparticles. HMHNs can be synthesized with proper amount of FC-04 surfactants due to the formation of FC-04 and P123 complex micelle, where FC-04 surfactant locates at the outer shell and the P123 constructs the inner core. Ascribed to the inherent hydride sites within the HMHNs, facile immobilization of Pd nanoparticles is achieved by using HMHNs as both the reducing agent and scaffold. The lesser processes produce some smaller Pd nanoparticles (2–3nm) within the pore voids and relatively larger Pd nanoparticles (10–15nm) on the outer surfaces of HMHNs. The catalytic hydrogenation of 4-nitrophenol demonstrates that the heterogeneous Pd catalyst is efficient.