Journal
CHEMISTRY OF MATERIALS
Volume 24, Issue 20, Pages 3828-3838Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm301081w
Keywords
mesoporous materials; hierarchical porous; titanium oxide films; palladium nanoparticle; Pd-TiO2 catalyst; hydrogenation of 1,3-butadiene
Funding
- BMBF [FKZ 03X5517A]
- German National Science Foundation (DFG) [EXC 314]
- Technical University Berlin
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Control over the size of active metal particles and the structure of catalysts pore system is an essential requirement for the design of supported catalysts. Polymeric templates combined with a suitable metal-oxide precursor enable the synthesis of defined pore systems, whereas colloidal metal particles can provide access to the particle-size control. However, pore template, metal-oxide precursor, and colloidal metal particles combined in one synthesis solution are often not compatible with each other due to aggregation, precipitation, and dissolution processes. We present a new approach to the preparation of supported catalysts that permits the controlled coassembly of preformed colloidal metal nanoparticles, polymeric pore templates, and a metal-oxide precursor from a water-based solution. The synthesis is enabled by establishing under pH-neutral conditions the templating of defined pores using titanium(IV) bis(ammonium lactato) dihydroxide as an unconventional metal-oxide precursor. The presented approach provides a modular strategy for the precise control of the catalysts nanostructure. This is illustrated for the synthesis of mesoporous as well as hierarchically porous Pd/TiO2 catalysts prepared from colloidal solutions of palladium nanoparticles. The catalysts show high activity and selectivity in the gas-phase hydrogenation of 1,3-butadiene.
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