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Catalytic effect of metal oxides on CO<sub>2</sub> absorption in an aqueous potassium salt of lysine
Dharmalingam, Sivanesan,Park, Ki Tae,Lee, Ju-Yeol,Park, Il-Gun,Jeong, Soon Kwan THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.68 No.-
<P><B>Abstract</B></P> <P>We report the catalytic effects of metal oxides on the CO<SUB>2</SUB> absorption rate in an aqueous potassium salt of <SMALL>L</SMALL>-lysine-HCl using the vapor liquid equilibrium method. The best CO<SUB>2</SUB> absorption rate obtained through testing metal oxides in a highly concentrated potassium salt of amino acids (2.0M) was identified using CuO. The recyclability of the metal oxides was tested over three cycles. The catalyst CuO was found to enhance the absorption rate of CO<SUB>2</SUB> by 61%. A possible mechanism was proposed based on NMR spectroscopy studies. Further, the effect of change in liquid absorbent viscosity on CO<SUB>2</SUB> absorption is discussed.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Dharmalingam Sivanesan,Bongkuk Seo,Choong-sun Lim,Hyeon-Gook Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.83 No.-
The conversion of CO2 into value-added chemicals of industrial significance is of great interest due toglobal warming-related concerns and the depletion of natural resources. This paper describes amononuclear copper complex with an N3S coordination environment that can catalyze the conversion ofCO2 into the carbonate anion with an ambient O2. Electrochemical studies indicate that the N3S-ligatedCu(II) complex can be reduced to Cu(I), which can subsequently generate the carbonate anion from CO2and ambient O2. In presence of LiClO4 when the N3S-ligated complex Cu(II) is reduced to Cu(I), thecomplex easily releases the carbonate anion which easily precipitates as Li2CO3 in CH3CN. These studiessuggest that the N3S-ligated Cu(II)/(I) complexes can be used to convert CO2 to carbonate and isolate thegenerated carbonate.
Sivanesan Dharmalingam,구은회,윤성호,Gyoosoon Park 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A Cu(II) complex with an three nitrogens and one sulfur coordination environment was synthesized and characterized. Its redox potential was observed at 0.483 V vs. NHE, very similar to that of a Cu-containing fungal enzyme, galactose oxidase, which catalyzes the oxidation of alcohols to corresponding aldehydes with the concomitant reduction of molecular oxygen to water. The Cu(II) complex selectively oxidizes the benzylic alcohols using TEMPO/O2 under mild reaction conditions to corresponding aldehydes without forming any over-oxidation product. Moreover, the catalyst can be recovered and reused multiple times for further oxidation reactions, thus minimizing the waste generation.
Catalytic effect of metal oxides on CO2 absorption in an aqueous potassium salt of lysine
Sivanesan Dharmalingam,박기태,이주열,박일건,정순관 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
We report the catalytic effects of metal oxides on the CO2 absorption rate in an aqueous potassium salt of l-lysine-HCl using the vapor liquid equilibrium method. The best CO2 absorption rate obtained through testing metal oxides in a highly concentrated potassium salt of amino acids (2.0 M) was identified using CuO. The recyclability of the metal oxides was tested over three cycles. The catalyst CuO was found to enhance the absorption rate of CO2 by 61%. A possible mechanism was proposed based on NMR spectroscopy studies. Further, the effect of change in liquid absorbent viscosity on CO2 absorption is discussed.
Dharmalingam, Sivanesan,Koo, Eunhae,Yoon, Sungho,Park, Gyoosoon Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A Cu(II) complex with an three nitrogens and one sulfur coordination environment was synthesized and characterized. Its redox potential was observed at 0.483 V vs. NHE, very similar to that of a Cu-containing fungal enzyme, galactose oxidase, which catalyzes the oxidation of alcohols to corresponding aldehydes with the concomitant reduction of molecular oxygen to water. The Cu(II) complex selectively oxidizes the benzylic alcohols using TEMPO/$O_2$ under mild reaction conditions to corresponding aldehydes without forming any over-oxidation product. Moreover, the catalyst can be recovered and reused multiple times for further oxidation reactions, thus minimizing the waste generation.
Enhanced CO2 absorption and desorption in a tertiary amine medium with a carbonic anhydrase mimic
Dharmalingam Sivanesan,윤민혜,Arti Murnandari,강지민,박기태,김학주,정순관 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
We report the effects of a series of carbonic anhydrase (CA) model complexes on CO2 absorption anddesorption in an aqueous tertiary amine medium. The CO2 hydration efficiency was determined underbasic conditions by using stopped-flow kinetics experiments. Catalyst 6 was found to exhibit the best CO2hydration efficiency (3.130 103M 1 s 1) in the tertiary amine medium. In a highly concentrated tertiaryamine medium, catalyst 2 was found to enhance the absorption and regeneration efficiency of CO2 by 10%and 24%, respectively. Our results for simple CA model complexes indicate that possible usage ofsynthesized complexes in post-combustion process.
Sivanesan, Dharmalingam,Youn, Min Hye,Park, Ki Tae,Kim, Hak Joo,Jeong, Soon Kwan American Chemical Society 2017 Crystal Growth & Design Vol.17 No.9
<P>We report the synthesis of cocrystals of a substituted benzoxazole and catechol from a primary amine and 3,5-di-tert-butylbenzoquinone. Fourier transform infrared and NMR spectroscopy studies revealed that cocrystals 2 could be synthesized in excellent yield from 1 and 3,5-di-tertbutylbenzoquinone. Introduction of an amine into the cocrystal structure enhanced the CO2 adsorption capacity of the cocrystals at room temperature from 15.69 to 44.21 mg/g. Our results indicated the ability to use cocrystals for CO2 capture and to easily modify them to enhance their CO2 adsorption capacity.</P>
Sivanesan, Dharmalingam,Youn, Min Hye,Murnandari, Arti,Kang, Ji Min,Park, Ki Tae,Kim, Hak Joo,Jeong, Soon Kwan Elsevier 2017 Journal of industrial and engineering chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>We report the effects of a series of carbonic anhydrase (CA) model complexes on CO<SUB>2</SUB> absorption and desorption in an aqueous tertiary amine medium. The CO<SUB>2</SUB> hydration efficiency was determined under basic conditions by using stopped-flow kinetics experiments. Catalyst <B>6</B> was found to exhibit the best CO<SUB>2</SUB> hydration efficiency (3.130×10<SUP>3</SUP> M<SUP>−1</SUP> s<SUP>−1</SUP>) in the tertiary amine medium. In a highly concentrated tertiary amine medium, catalyst <B>2</B> was found to enhance the absorption and regeneration efficiency of CO<SUB>2</SUB> by 10% and 24%, respectively. Our results for simple CA model complexes indicate that possible usage of synthesized complexes in post-combustion process.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Sivanesan, Dharmalingam,Kannan, Sethuraman,Thangadurai, Thangaian Daniel,Jung, Kwang-Deog,Yoon, Sungho The Royal Society of Chemistry 2014 Dalton Transactions Vol.43 No.30
<P>The synthesis and physical properties of dimanganese(<SMALL>II</SMALL>) compounds with varying numbers of water ligands housed in the four bulky carboxylate motifs, including the first complex with a parallelogram core {Mn<SUB>2</SUB>(μ-OH<SUB>2</SUB>)<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP> unit, are described. The isolation of these complexes revealed how water could alter the structural and electrochemical properties of similar carboxylate-bridged dimanganese(<SMALL>II</SMALL>) cores that may occur in a variety of active sites of Mn-containing metalloenzymes. These studies support the notion that water molecules in coordination spheres of active sites of metalloproteins are not a simple spectator medium but the modulation factor of structures and functions.</P> <P>Graphic Abstract</P><P>The three manganese complexes with the {Mn<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP>, {Mn<SUB>2</SUB>(μ-OH<SUB>2</SUB>)<SUB>2</SUB>(μ-O<SUB>2</SUB>CR)}<SUP>3+</SUP>, and {Mn<SUB>2</SUB>(OH<SUB>6</SUB>)<SUB>2</SUB>(O<SUB>2</SUB>CR)}<SUP>3+</SUP> motifs are in dynamic equilibrium, displaying significantly different electrochemical properties ranging from 0.52 V to 1.19 V <I>vs.</I> Fc/Fc<SUP>+</SUP>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt00520a'> </P>