Silicon based microreactors for catalytic reduction in aqueous phase: Use of carbon nanofiber supported palladium catalyst

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• 作者：D.B. Thakur ; R.M. Tiggelaar ; J.G.E. Gardeniers ; L. Lefferts ; K. Seshan
• 关键词：Silicon microreactors ; Carbon nanofibers ; Structured catalyst support ; Nitrite conversion
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：1 July, 2013
• 年：2013
• 卷：227
• 期：Complete
• 页码：128-136
• 全文大小：2135 K

文摘

Carbon nanofiber layers containing palladium particles were synthesized inside the channels of a silicon based microreactor. Pd catalyst was prepared via dry impregnation using palladium acetylacetonate precursor solution in toluene. Several catalyst loadings were impregnated on five different CNF-layer thicknesses in the range 10-20 ¦Ìm: for all loadings a relatively large average Pd particle size of ¡«8 nm was obtained. The lateral and axial distribution of these metallic nanoparticles was uniform across the support for CNF-layer thicknesses up to 13 ¦Ìm. For larger thicknesses, the presence of a dense carbonaceous layer underneath the open CNF-layer negatively affects the accessibility for Pd nanoparticles, resulting in a less good lateral distribution. External and internal mass transfer properties were evaluated, by carrying out hydrogenation of nitrite ions in aqueous phase. For sufficiently thin CNF-layers (?13 ¦Ìm) hydrogenation was under kinetic control, indicating absence of mass transfer limitations and thus good accessibility and performance of the Pd containing CNF layers for reactant species.