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Synthesis and performance evaluation of hydrocracking catalysts: A review
Roba Saab,Kyriaki Polychronopoulou,Lianxi Zheng,S. Kumar,Andreas Schiffer 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
This review provides a comprehensive summary of current hydrocracking applications, and presentsrecent advances in the synthesis and structure/composition control of various nanomaterials used inhydrocracking catalysts. Although a wide range of feeds are considered in this review, particular focus isplaced on hydrocracking of aromatic and paraffinic compounds. The significance, concepts and principlesof the hydrocracking process arefirst discussed focusing on its wide range of industrial applications. Then, recent advances in the synthesis of hydrocracking catalysts are presented, including different typesof zeolites and metal promoted catalysts. Finally, we compare the performances of a wide range ofhydrocracking catalysts, and discuss how their intrinsic properties (e.g. surface area, porosity, acidity,morphology and structure) can be controlled to achieve optimal catalytic performance in hydrocrackingof aromatic compounds, heavy petrochemicals, paraffinic hydrocarbons and vegetable oils.
Song, Kyung Seob,Kim, Daeok,Polychronopoulou, Kyriaki,Coskun, Ali American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.40
<P>Metal-containing amorphous microporous polymers are an emerging class of functional porous materials in which the surface properties and functions of polymers are dictated by the nature of the metal ions incorporated into the framework. In an effort to introduce coordinatively unsaturated metal sites into the porous polymers, we demonstrate herein an aqueous-phase synthesis of porous coordination polymers (PCPs) incorporating bis(o-diiminobenzosemiquinonato)-Cu(II) or -Ni(II) bridges by simply reacting hexaminotriptycene with CuSO4 center dot 5H(2)O [Cu(II)-PCP] or NiCl2 center dot 6H(2)O [Ni(II)-PCP] in H2O. The resulting polymers showed surface areas of up to 489 m(2) g(-1) along with a narrow pore size distribution. The presence of open metal sites significantly improved the gas affinity of these frameworks, leading to an exceptional isosteric heat of adsorption of 10.3 kJ.mol(-1) for H-2 at zero coverage. The high affinities of Cu(II)- and Ni(II)-PCPs toward CO2 prompted us to investigate the removal of CO2 from natural and landfill gas conditions. We found that the higher affinity of Cu(II)-PCP compared to that of Ni(II)-PCP not only allowed for the tuning of the affinity of CO2 molecules toward the sorbent, but also led to an exceptional CO2/CH4 selectivity of 35.1 for landfill gas and 20.7 for natural gas at 298 K. These high selectivities were further verified by breakthrough measurements under the simulated natural and landfill gas conditions, in which both Cu(II)- and Ni(II)-PCPs showed complete removal of CO2. These results clearly demonstrate the promising attributes of metal-containing porous polymers for gas storage and separation applications.</P>
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.
Buyukcakir, Onur,Je, Sang Hyun,Choi, Dong Shin,Talapaneni, Siddulu Naiudu,Seo, Yongbeom,Jung, Yousung,Polychronopoulou, Kyriaki,Coskun, Ali The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.5
<P>Porous cationic polymers (PCPs) with surface areas up to 755 m(2) g(-1) bearing positively charged viologen units in their backbones and different counteranions have been prepared. We have demonstrated that by simply varying counteranions both gas sorption and catalytic properties of PCPs can be tuned for metal-free capture and conversion of CO2 into value-added products such as cyclic carbonates with excellent yields.</P>
Mercouri G. Kanatzidis: Excellence and Innovations in Inorganic and Solid-State Chemistry
Arachchige, Indika U.,Armatas, Gerasimos S.,Biswas, Kanishka,Subrahmanyam, Kota S.,Latturner, Susan,Malliakas, Christos D.,Manos, Manolis J.,Oh, Youngtak,Polychronopoulou, Kyriaki,P. Poudeu, Pierre. F ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol. No.
<P>Over the last 3-4 decades, solid-state chemistry has emerged as the forefront of materials design and development. The field has revolutionized into a multidisciplinary subject and matured with a scope of new synthetic strategies, new challenges, and opportunities. Understanding the structure is very crucial in the design of appropriate materials for desired applications. Professor Mercouri G. Kanatzidis has encountered both challenges and opportunities during the course of the discovery of many novel materials. Throughout his scientific career, Mercouri and his group discovered several inorganic compounds and pioneered structure-property relationships. We, a few Ph.D. and postdoctoral students, celebrate his 60th birthday by providing a Viewpoint summarizing his contributions to inorganic solid-state chemistry. The topics discussed here are of significant interest to various scientific communities ranging from condensed matter to green energy production.</P>