As the demand for H 2O 2 is likely to increase in the future (2M tonnes production in 2003), alternative production routes are certainly of commercial interest. This process is not ideal, but other methods of production need to consider that potentially explosive mixtures can be generated on scale-up. H 2O 2 is extensively used in the pulp paper/textile industries and is currently produced by the anthraquinone process. Results indicated that both a high partial pressure of hydrogen and surface oxidised Pd particles were needed for high activity. The effect of the Pd oxidation state, H 2 partial pressure and synthesis variables were discussed. The procedure involved coating an alumina tube with a ceramic layer then a carbon layer, followed by Pd deposition. Melada and colleagues (University of Venezia, Italy) and G. The design of a Pd/carbon coated asymmetric α-Al 2O 3 membrane catalyst for the production of hydrogen peroxide (H 2O 2) by direct synthesis was described by S. It was suggested that the samples could be suitable for use in the catalytic chambers of gas turbines. SEM and thermal testing confirmed excellent adhesion and thermal stability. Samples were characterised by XRD, SEM and XPS. In the procedure, a layer of alumina was deposited onto the metal surface for good adhesion, this was followed by a second alumina phase, and then the catalyst. The cold gas method was employed to deposit the metals onto thin metal foils, although other types of support, such as sheet, metal plate and foam were also discussed. Kosarev (Institute of Theoretical and Applied Mechanics, Novosibirsk, Russia). Podyacheva and coworkers (Boreskov Institute of Catalysis), and O. Plasma spraying and cold gas dynamic spray methods used in preparing palladium (Pd), Pd-Mn, Cu-Cr and Mn catalysts for methane combustion were described by O. However, material made with only one nozzle for the Pt, Ba and Al had no NOx storage capacity. The resulting material was found to have good NOx storage capacity.
The material was prepared using two flame spray pyrolysis nozzles, one for the Al precursor and the other for the Pt/Ba precursors. A one-step flame synthesis route to Pt/Ba/Al 2O 3 was described by Reto Strobel (ETH Zurich, Switzerland).
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