Sierpinski carbon: Macroporous carbide‐derived carbon monoliths (DUT‐38) were synthesized starting from SiC‐PolyHIPEs, resulting in a hierarchical micro‐, meso‐, and macroporous structure. The high specific surface area and high macropore volume renders PolyHIPE‐CDC an excellent adsorbent combining high storage capacity with excellent adsorption rates in gas storage and air filtration.

A new synthesis scheme for the formation of porous CeO2/Pt-polycarbosilane composites using inverse microemulsions is presented. Aqueous hexachloroplatinic acid was used as a hydrosilylation catalyst causing crosslinking of allyl groups in a liquid polycarbosilane (PCS). The resulting polymers are temperature stable and highly porous. The Pt catalyst content and post-treatment of the polymer can be used to adjust the porosity. For the first time hydrophobic polymers with specific surface areas up to 896 m(2)/g were obtained by catalytic crosslinking of polycarbosilanes. Ceria nanoparticles 2-3 nm in diameter are well dispersed in the PCS matrix as proven using high resolution electron microscopy. Porosity of the hydrophobic materials could be increased up to 992 m(2)/g by adding divinylbenzene in the oil phase. Pyrolyses at 1200-1500 degrees C and post-oxidative treatment at various temperatures produce porous ceramic structures with surface areas up to 423 m(2)/g. X-Ray diffration investigations show that the crystallinity of the SiC matrix can be controlled by the pyrolysis temperature. Post-oxidative treatments cause silicon oxycarbide formation. Structure and morphology of the polymeric and ceramic composites were investigated using Si-29 MAS NMR, FESEM, FT-IR and EDX techniques. The temperature programmed oxidation (TPO) of methane shows a high catalytic activity of CeO2/Pt-SiC(O) composites lowering the onset in the TPO to 400-500 degrees C

Cerium(IV) oxide nanoparticles were synthesized using an inverse miniemulsion technique with cerium nitrate hexahydrate as precursor. The resulting nanocrystallites are as small as 5 nm with a specific surface area of 158 m² g⁻¹ after calcination at 400 °C. With the addition of cetyltrimethylammonium bromide (CTAB) or (poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)) triblock copolymers (PEO-PPO-PEO) as template in the miniemulsion droplets, the specific surface area can be increased up to 255 m² g⁻¹. The miniemulsions were characterized by dynamic light scattering (DLS) and the obtained oxides were examined by x-ray diffraction (XRD), nitrogen sorption (BET and BJH), and transmission electron microscopy (TEM). The catalytic activity of the resulting ceria was investigated for the temperature-programmed oxidation (TPO) of methane.

Sierpinski‐Kohlenstoff: Von makroporösem Carbiden abgeleitete Kohlenstoffmonolithe (DUT‐38) mit einer hierarchischen Porenstruktur aus Mikro‐, Meso‐ und Makroporen, einer großen spezifischen Oberfläche und einem großen Makroporenvolumen wurden hergestellt. Diese Materialien sind ideale Adsorbentien, da hohe Speicherkapazitäten mit exzellenten Adsorptionsraten in der Gasspeicherung und Luftfiltration kombiniert werden.

We have studied the catalytic activity of CeO(2)/Pt-SiC composites in the total and partial oxidation as well as the dry reforming of methane. The composites were synthesized by an in situ functionalization strategy with variation in ceria and platinum contents and processing conditions. The impact of composition and pyrolysis temperature on the specific surface area and catalytic activity of the composite materials is studied. All catalysts have a high activity in the partial oxidation and dry reforming of methane close to the thermodynamic equilibrium composition. In the complete oxidation of methane, the T(10%) was lowered by 443 K compared to the non-catalyzed reaction