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      저자 : Lourdes F. Vega (검색결과 2 건)
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      • Pressure Controlled Polymer Cross-linked Structure in Graphene Oxide Membrane for Selective Ion Separation

        방기력,Daniel Bahamon,Lourdes F. Vega,조은선 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

        Assembling graphene oxide (GO) layers into a layer-stacked structure with nano-scale channels has turned out an effective way for promising applications, including ion exchange membranes and desalination. As modification of GO layers can be carried out by various chemical reactions in bulk solution before the formation of membrane structures, the physicochemical and electrostatic properties of the nanoscale pathway are greatly changed, leading to a different ion and water transport behavior in nanochannel. In this work, we prepared a GO membrane having a polymer cross-linked structure composed of hyper-branched polyethylenimine (HPEI) and polyacrylic acid (PAA) in nanochannels. We found that the channel size of composite membranes is controlled depending on the applied pressure during the amide bond formation between HPEI and PAA, while at the same time improving charge properties of nanochannels due to inserted polyelectrolytes, resulting in a high ion separation performance.

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        Deoxygenation of vegetable oils and fatty acids: How can we steer the reaction selectivity towards diesel range hydrocarbons?

        Sara Alkhoori,Maryam Khaleel,Lourdes F. Vega,Kyriaki Polychronopoulou 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

        Fast pyrolysis is a prominent and versatile process that involves thermal decomposition of biomass feedstocksto produce high volumes of liquid bio-oil, which may eventually be upgraded via deoxygenationpathways (hydrodeoxygenation, decarboxylation, or decarbonylation) into high energy content greenfuels like gasoline, diesel and jet fuel. The quality of the bio-oil, its thermal stability, heating value,and the efficiency of the total conversion process can be improved by deoxygenation over properlydesigned catalysts. Despite the success of the available catalysts to significantly improve bio-oil qualityby producing useful aromatic hydrocarbons, phenolics, or alkanes, there are still opportunities for furtherimprovements of the catalytic performance with regards to their activity, product selectivity and resistivityagainst deactivation. The present work provides a comprehensive analysis of the recent developmentsof sulfur-free monometallic and bimetallic transition metal and noble metal supported catalysts forselective deoxygenation of vegetable oils and fatty acids model compounds for biofuel production. Theattention focuses on the design of active sites on these catalysts as well as the acidic nature of the integratedsupports for selectively manipulating mechanistic pathways. Moreover, this review emphasizes onthe role of doping in stabilizing metal oxides to tune metal-support interaction (MSI) and electron donationproperties, all strategies combined for the enhancement of biofuel production. The novelty of thisreview lies on bridging theoretical and experimental investigations aiming at describing and interpretingdeoxygenation pathways of vegetable oils and related model compounds. Current challenges and perspectiveare also provided.

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