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- 저자 : Maryam Khaleel (검색결과 2 건)
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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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Xu, Dandan,Abdelrahman, Omar,Ahn, Sang Hyun,Guefrachi, Yasmine,Kuznetsov, Anatoliy,Ren, Limin,Hwang, Sonjong,Khaleel, Maryam,Al Hassan, Saeed,Liu, Dongxia,Hong, Suk Bong,Dauenhauer, Paul,Tsapatsis, Mi John Wiley Sons, Inc. 2019 AIChE journal Vol.65 No.3
<P>Micro/meso/macroporous (hierarchical) zeolites show remarkable catalytic performance for reactions involving bulky reactants. However, quantitative assessment of the microstructural characteristics contributing to the observed performance remains elusive. Here, structure–activity relationships are established for a set of micro/mesoporous self‐pillared pentasil (SPP) zeolites using two parallel liquid‐phase reactions (benzyl alcohol alkylation and self‐etherification) based on analysis of mass transport and reaction kinetics. A reaction–diffusion mathematical model is developed that quantitatively assigns the catalytic contributions of the external surface and micropores of SPP zeolites for these reactions. In addition, the effect of the zeolite external surface structure on the corresponding catalytic activity is quantitatively assessed by comparing SPP zeolites (with MFI structure) with MCM‐22 (with MWW structure). This work demonstrates that reaction–diffusion modeling allows quantitative description of the catalytic performance of hierarchical zeolites and provides a model reaction to assess nm‐sized characteristic diffusion lengths in MFI. © 2018 American Institute of Chemical Engineers <I>AIChE J</I>, 65: 1067–1075, 2019</P>
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