Astrid Boisen

TEM stereo-imaging of mesoporous zeolite single crystals

Mesoporous zeolite single crystals with intracrystalline mesopores and metal oxide particles located in the zeolite mesopore are characterised by direct TEM stereo-imaging.

Preparation and characterization of mesoporous TS-1 catalyst

Highly crystalline titanium-containing zeolite TS-1 with an intracrystalline mesopore system has been prepared and characterized. The TS-1 zeolite is crystallized in a carbon nanoparticle matrix (18 nm particles), which is subsequently removed by heating, leaving a mesopore system with the same diameter as the carbon nanoparticles. The resulting mesoporous TS-1 zeolite is characterized using X-Ray diffraction, Inductively Coupled Plasma emission spectroscopy, UV/vis-spectroscopy, Raman spectroscopy, Hg-porosimetry and Scanning Electron Microscopy. The results show, that the TS-1 is highly crystalline, anatase-free and highly mesoporous with an average crystal size of ≈5 μm. The mesoporous TS-1 is shown to exhibit a smaller degree of diffusion limitations in the epoxidation of cyclohexene with aqueous hydrogen peroxide than conventional TS-1.

Non-Crystallographic Nanopores in Single Crystals: A New Approach in Nanomaterials Chemistry

Nanomaterials are the building blocks of nanotechnology. Recently, nanotube materials have attracted considerable attention due to their unique physical and chemical properties. Here we discuss how nanotubes can be used as templates for preparation of a new family of materials, the nanoporous single crystals, and for the preparation of metal sulfide nanotube materials. Today, the characterization of these materials depends heavily on electron microscopy. However, as rational synthesis schemes are becoming available, more well-defined, homogeneous nanotube samples will be produced and the role of diffraction techniques may increase.