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An Aerosol-Process for the Synthesis of Nanostructured Molybdenum Oxide Catalysts by Integrated Chemical Vapour Synthesis/Chemical Vapour Deposition at Atmospheric Pressure

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Abstract:

We report the synthesis of composite nanoparticles by an integrated CVS/CVD process at atmospheric pressure. Iron oxide and silica support particles were generated by chemical vapour synthesis (CVS), using Fe(CO)5 and Si(OC2H5)4 and were directly coated in the aerosol state with molybdenum oxide by chemical vapour deposition of Mo(CO)6. Depending on the CVS temperature hematite (600 °C) or maghemite (1500 °C) iron oxide phases were determined by XRD and FTIR. Core–shell structures with a coating thickness in the lower nm range were obtained for CVD temperatures below 150 °C. Complete encapsulation of the core particles and uniform elemental distribution is shown by TEM and EELS measurements. Higher CVD temperatures lead to unwanted homogenous decomposition of the molybdenum precursor. Additional aerosol temperature treatment was used to reach further oxidation and the formation of a mixed oxide shell, indicated by FTIR measurements. The results show the potential of the process for the synthesis of structured core–shell nanoparticles.

Keywords: CVD; CVS; IRON OXIDE; MOLYBDENUM OXIDE; NANOSTRUCTURED; SILICA

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.5071

Publication date: September 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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