화학공학소재연구정보센터
Chemical Engineering Journal, Vol.227, 128-136, 2013
Silicon based microreactors for catalytic reduction in aqueous phase: Use of carbon nanofiber supported palladium catalyst
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 mu m: for all loadings a relatively large average Pd particle size of similar to 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 mu m. 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 mu m) 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. (C) 2012 Elsevier B.V. All rights reserved.