Supercritical water (SCW) as a reaction medium is especially promising for the production of renewable chemicals from biomass. Stability issues of catalyst support materials in SCW are a major setback for these reactions and hinder the further development and industrial exploitation of this technique. The development of stable catalytic support materials for reactions in SCW is, therefore, of great importance. Carbon nanotubes (CNTs) are widely recognized for their significant physical and chemical stability, high heat conductivity, and open structure. These properties have already been explored for different applications. We show that CNTs are a promising stable catalyst support material for reactions in SCW. As an illustration of the applicability of CNTs in SCW, we demonstrate the efficiency of Pt‐CNTs as catalysts for the production of hydrogen by reforming of ethylene glycol and acetic acid in SCW.
Carbon Nanofibers (CNF) layers were synthesized nickel-based thin-films on flat fused silica
substrates. CNF synthesis was performed via thermal catalytic chemical vapor deposition of
ethylene using nickel as metal catalyst. Different underlayer metal thin films, viz. titanium, tantalum
and titanium-tungsten were tested in order to obtain stable and well-attached CNF films on fused
silica substrates. It is found in case of titanium CNFs are formed on the nickel, but due to severe
Ni/Ti inderdiffusion the titanium film looses its adhesive function, as a consequence of which the
formed CNF film detaches from the substrate. The use of tantalum or titanium-tungsten as adhesion
layer resulted in stable and well-adhered CNF films on fused silica substrates, of which the
morphology can be controlled by the growth time.
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