Carbon nanofiber based catalyst supports to be used in microreactors: Synthesis and characterization


Thakur, D.B. and Tiggelaar, R.M. and Gardeniers, J.G.E. and Lefferts, L. and Seshan, K. (2010) Carbon nanofiber based catalyst supports to be used in microreactors: Synthesis and characterization. Chemical Engineering Journal, 160 (3). pp. 899-908. ISSN 0300-9467

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Abstract:Carbon nanofiber (CNF) layers have been synthesized on flat fused silica and silicon substrates, as well as inside flow channels of silicon-technology based microreactors by thermal catalytic chemical vapor deposition of ethylene using nickel thin-film catalyst. These CNF layers are to be used as structured catalyst support. The influence of the ethylene concentration and addition of hydrogen to the carbon-containing gas on the morphology of CNF layers was studied. Very low amount of CNFs were produced at low ethylene concentrations (<25%) due to the restricted supply of carbon species. Addition of hydrogen during the CNF growth resulted in significant enhancement of the CNF-yield, producing thicker layers of CNFs and CNFs with smaller diameters. Channels containing silicon micropillars covered with these CNFs have a significantly enhanced surface-to-volume ratio compared to bare microreactor channels (3–4 orders of magnitude). Deposition of well-distributed platinum nanoparticles was carried out on these CNF layers, exemplifying their functionality as structured catalyst support to be used in microreactors
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