Yazar "Kilinc, Dilek" seçeneğine göre listele

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    A study on the ligand-bound Mn(II) complex
    (Taylor & Francis Inc, 2020) Sahin, Omer; Kilinc, Dilek; Horoz, Sabit
    5 amino-2,4-dichlorophenol-3,5 ditertbuthylsalisylaldimine-Mn(II) complex was synthesized via the wet chemical method. The Mn(II) complex, characterized by its structural and optical properties, has been used as a sensitizer in a dye-sensitized solar cell structure by growing on TiO2 coated on fluorine-doped tin oxide conductive glass substrate. The power conversion efficiency of the TiO2/Mn (II) complex structure was calculated by current density (J) versus voltage (V) measurement. The calculated power conversion efficiency (eta%) of TiO2/Mn(II) complex is %1.44. The obtained result shows that this device can be used as a promising sensitizer in solar cell application.
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    Al2O3 based Co-Schiff Base complex catalyst in hydrogen generation
    (Pergamon-Elsevier Science Ltd, 2019) Kilinc, Dilek; Sahin, Omer
    This work presents the study of the catalytic activity of aluminum oxide supported Co-Schiff Base complex derived from 4,4'-Methylenebis(2,6-diethylaniline)-3,5,-itertbutylsalicylaldimine-Co-Schiff Base complex in sodium borohydride hydrolysis. This catalyst is characterized with XRD, FT-IR, SEM, TEM, and BET. The respective reaction kinetics have been calculated. With the catalyst condition, maximum reaction (initial) rate is 106540 and 147193,3 mL H-2/g(cat). min. at 30 degrees C and 50 degrees C. For this reaction apparent activation energy is 44,7792 k.J mol(-1) with 20-50 degrees C. The reaction order value (n) for this catalytic system is 0,31. Additionally when Al2O3 supported Co-Schiff Base complex compared with pure Co-Schiff Base complex, the experimental results show that the aluminum oxide support exhibits enhancing effect with 106540 and 64147 mL H-2/g(cat ) min respectively in sodium borohydride hydrolysis to Hydrogen production. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Co complex modified on Eupergit C as a highly active catalyst for enhanced hydrogen production
    (Pergamon-Elsevier Science Ltd, 2022) Kilinc, Dilek
    In present paper, the preparation and catalytic activity of Eupergit C polymer (EC) modified Co complex was reported. Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), Brunauer-Emmett-Teller Surface Area Analysis (BET), Fourier Transform Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM) coupled with energy dispersive X-ray (EDX) and X-ray photoelectron spectroscopy (XPS) were used to characterization of catalyst. EC modified-Co complex was the first time examined as a catalyst in NaBH4 hydrolysis to H2 evolution. The kinetic calculations were determined by using two different kinetic methods. The low activation energy barriers were achieved as 21.673 kJ mol(-1) for nth order model and as 21.061kJmol(-1) for Langmuir-Hinshelwood (L-H) model at low temperatures. EC modified-Co complex catalyst exhibited high performance with H-2 evolution rates of 3914 mL H(2)g(cat)(-1)min(-1) and 9183 mL H(2)g(cat)(-1)min(-1) at 30 degrees C-50 degrees C. Additionally, Langmuir-Hinshelwood mechanism was explained for EC modified Co complex catalyzed sodium borohydride hydrolysis reaction. The reusability experiments showed that EC modified-Co complex catalyst maintained excellent stability with 100% conversion and without significant lost after the 6th run. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Development of highly efficient and reusable Ruthenium complex catalyst for hydrogen evolution
    (Pergamon-Elsevier Science Ltd, 2022) Kilinc, Dilek; Sahin, Omer
    Herein, we report an efficient, environmentally friendly and stable catalyst development to hydrogen evolution from sodium borohydride hydrolysis. For this purpose, Ruthenium complex catalyst successfully fabricated via 5-Amino-2,4-dichlorophenol-3,5-ditertbutylsalisylaldimine ligand and RuCl3.H2O salt. Ru complex catalyst was identified with X-Ray Diffraction Analysis, Infrared Spectroscopy, Elemental Analysis, Transmission electron microscopy, Scanning Electron Microscope and Brunauer-Emmett-Teller Surface Area Analysis. According to the analysis results, it was confirmed that Ru complex catalyst was successfully synthesized. Ru complex was used as a catalyst in NaBH4 hydrolysis. The kinetic performance of Ru complex catalyst was evaluated at various reaction tempera-tures, various sodium borohydride concentration, catalyst concentration and sodium hy-droxide concentration in hydrogen evolution. The apparent activation energy for the hydrolysis of sodium borohydride was determined as 25.8 kJ mol(-1). With fully conversion, the promised well durability of Ru complex was achieved by the five consecutive cycles for hydrogen evolution in sodium borohydride hydrolysis The hydrogen evolution rates were 299,220 and 160,832 mL H-2 g(cat)(-1) min(-1) in order of at 50 degrees C and 30 degrees C. Furthermore, the proposed mechanism of Ru complex catalyzed sodium borohydride hydrolysis was defined step by step. This study provides different insight into the rational design and utilization and catalytic effects of ruthenium complex in hydrogen evolution performance. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Effect of Al2O3-supported Cu-Schiff base complex as a catalyst for hydrogen generation in NaBH4 hydrolysis
    (Taylor & Francis Inc, 2018) Kilinc, Dilek
    Cu-Schiff base complex which we previously synthesized (Kilinc et al., 2012) is supported on Al2O3. The prepared catalyst is characterized by using SEM, XRD, BET, and FT-IR methods. And Al2O3-supported complex is used as a catalyst in NaBH4 hydrolysis reaction for hydrogen generation. NaBH4 hydrolysis reactions are investigated depending on the concentration of NaBH4 and NaOH, temperature, percentage of Cu complex, and amount of catalyst. Maximum reaction rates are 44,453.33 and 57,410.00 mL H-2/g.cat.min at 30 degrees C and 50 degrees C, respectively. The activation energy of NaBH4 hydrolysis reaction is found as 225,775 kJ(.)mol(-1). All the experimental results and literature comparisons show that Al2O3-supported Cu-Schiff base complex is a very effective catalyst in NaBH4 hydrolysis for H-2 generation.
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    Effective TiO2 supported Cu-Complex catalyst in NaBH4 hydrolysis reaction to hydrogen generation
    (Pergamon-Elsevier Science Ltd, 2019) Kilinc, Dilek; Sahin, Omer
    This paper reports the experimental results on using TiO2 based Cu(II)-Schiff Base complex catalyst for hydrolysis of NaBH4. In the presence of Cu-Schiff Base complex which we reported in advance [1] and with titanium dioxide supports a novel catalyst named TiO2 supported 4-4'-Methylenbis (2,6-diethyl)aniline-3,5-di-tert-buthylsalisylaldimine-Cu complex is prepared, successfully. The synthesized catalyst was characterized by means of X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Brunauer-Emmett-Teller Surface Area Analysis (BET) and Fourier Transform Infrared Spectroscopy (FT-IR). The as prepared catalyst was employed to generate hydrogen through hydrolysis reaction of NaBH4. Effects of different parameters (e.g. amount of Cu-Schiff Base complex in all catalyst, percentage of NaBH4, percentage of NaOH, amount of TiO2 supported Cu-Schiff Base complex catalyst and different temperatures) are also investigated. A high apparent activation energy (Ea), 25,196 kJ.mol(-)1 is calculated for hydrolysis of NaBH4 at 20-50 degrees C. Hydrogen generation rate was 14,020 mL H-2/g(cat).min and 22,071 mL H-2/g(cat).min in order of 30 degrees C and 50 degrees C. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    High volume hydrogen evolution from KBH4 hydrolysis with palladium complex catalyst
    (Pergamon-Elsevier Science Ltd, 2020) Kilinc, Dilek; Sahin, Omer
    In this work, we aimed to present an efficient catalyst in potassium borohydride hydrolysis for hydrogen production. Therefore 5-Amino-2,4-dichlorophenol-3,5-ditertbutylsalisylaldimine-Pd complex was synthesized. FT-IR, SEM, TEM, BET, XRD, Elemental Analysis techniques was employed for characterization of Pd-complex catalyst. When the catalyst tested in KBH4 hydrolysis reaction, some affecting factors were studied such as temperatures (20 degrees C-50 degrees C), catalyst amounts (5-50 mg), KOH concentrations (0-10%) and KBH4 concentration (2-10%) The results displayed that the synthesized Palladium Schiff Base complex catalyst facilitates potassium borohydride hydrolysis with 25.194 kj/mol activation energy (Ea). Additionally, Pd Schiff Base complex demonstrated remarkable reusability performance and conserved 95% of its inherent catalytic activity even at sixth recycle. (C) 2020 Elsevier Ltd. All rights reserved.
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    Highly active and stable CeO2 supported nickel-complex catalyst in hydrogen generation
    (Pergamon-Elsevier Science Ltd, 2021) Kilinc, Dilek; Sahin, Omer
    Cerium oxide supported 5-Amino-2,4-dichlorophenol-3,5-ditertbutylsalisylaldimine-Nickel complex for the first time was used to produce H-2 from hydrolysis of sodium borohydride. Cerium oxide supported Nickel complex catalyzed hydrolysis systemwas studied depend on temperature, concentration of sodium hydroxide, amount of Cerium oxide supported Ni complex catalyst, concentration of Ni complex and concentration of sodium borohydride. Cerium oxide supported Ni(II) complex display highly effective catalytic activity in sodium borohydride hydrolysis reaction. The obtained Ceriumoxide supportedNi(II) complex catalyst was characterized by using Fourier Transform Infrared Spectroscopy, Scanning Electron Microscope, Transmission ElectronMicroscope, Brunauer-Emmett-Teller Surface Area Analysis, X-Ray Diffraction Analysis techniques. The catalyst stability was tested, even the fifth recycle the catalytic activity was maintained at 100%. Additionally the proposed Cerium oxide supported-Ni (II) complex catalyzed sodium borohydride hydrolysis mechanism was determined carefully. The experimental results showed that Ceriumoxide supported Ni (II) complex catalyst accelerate sodium borohydride hydrolysis with 43,392 and 19,630 mL H-2 g(cat)(-1) min(-1) hydrogenproductionratesat 50 degrees C and 30 degrees C respectively and20,587 kJ mol(-1) activationenergy. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Hydrogen generation from catalytic hydrolysis of sodium borohydride by a novel Co(II)-Cu(II) based complex catalyst
    (Elsevier, 2012) Kilinc, Dilek; Saka, Cafer; Sahin, Omer
    In the present work, Co(II)-Cu(II) supported salicylaldimine derivatives complex catalysts and their mixtures are tested for hydrogen generation from the hydrolysis reaction of sodium borohydride (NaBH4). The hydrolysis of NaBH4 with Co(II)-Cu(II) supported complex catalysts is investigated depending on the Co(II)-Cu(II) ratio, NaBH4 concentration, NaOH concentration, temperature and catalyst amount. The results suggested that the optimal mixture percentage of Co(II)-Cu(II) catalyst is 40:60. The obtained complex catalysts are characterized by XRD, FT-IR and SEM techniques and evaluated for their activity for the hydrogen generation from the hydrolysis reaction of NaBH4. (C) 2012 Elsevier B.V. All rights reserved.
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    Investigation on salisylaldimine-Ni complex catalyst as an alternative to increasing the performance of catalytic hydrolysis of sodium borohydride
    (Pergamon-Elsevier Science Ltd, 2017) Kilinc, Dilek; Sahin, Omer; Saka, Cafer
    In this study, 5-amino-2, 4-dichlorophenol-3, 5-ditertbutylsalisylaldimine-Ni complex catalyst is synthesised and used as an alternative to previous studies to produce hydrogen from hydrolysis of sodium borohydride. The resulting complex catalyst is characterised by XRD, XPS, SEM, FT-IR and BET surface area analyses. Experimental works are carried out at 30 degrees C with 2% NaBH4, 7% NaOH and 5 mg of catalyst. The maximum hydrogen production rate from hydrolysis of sodium borohydride with nickel-based complex catalyst compared to the pure nickel catalyst is increased from 772 ml min(-1) g(-1) to 2240 ml min(-1) g(-1) by an increase of 190%. At the same time, the hydrolysis reaction with pure nickel catalyst is completed in 145 min while the hydrolysis reaction with nickel-based complex catalyst is completed in 50 min. The activation energy of this hydrolysis reaction was calculated as 18.16 kJ mol(-1). This work also includes kinetic information for the hydrolysis of NaBH4.The reusability of the nickel-based complex catalyst used in this study has also been studied. The nickel-based complex catalyst is maintained the activity of 72% after the sixth use, compared to the first catalytic use. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Metal-Schiff Base complex catalyst in KBH4 hydrolysis reaction for hydrogen production
    (Pergamon-Elsevier Science Ltd, 2019) Kilinc, Dilek; Sahin, Omer
    It is the first study to synthesize Co(II)-Schiff Base complex and to use it like a catalyst for potassium borohydride hydrolysis reaction to hydrogen production. Co(II)-complex is synthesized with CoCl2 center dot 6H(2)O and 5-Amino-2,4-dichlorophenol-3,5-di-tert-butylsalisylaldimine ligand. KBH4 hydrolysis reaction is studied according as percentage of KBH4, percentage of KOH, amount of Co-Schiff Base complex catalyst and temperature effects. Co Schiff Base complex is highly effective catalyst and initial rates (R-o) of KBH4 hydrolysis reaction were 61220.00 and 99746.67 mL H-2. g(-1) cat. min(-1) at 30 degrees C and 50 degrees C. Furthermore this study includes the kinetic calculations and for this reaction calculated activation energy is 17.56 kJ mol(-1). (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Performance of Zn-Schiff Base complex catalyst in NaBH4 hydrolysis reaction
    (Pergamon-Elsevier Science Ltd, 2020) Kilinc, Dilek; Sahin, Omer
    This study presents 4,40-methylenebis(2,6-diethyl)aniline-3,5-ditertbutylsalisilaldimine-Zn complex synthesis and its using as a catalyst in sodium borohydride hydrolysis to H-2 generation. Surface morphology and structural properties of Zn-complex were investigated with XRD, FTIR, SEM, and BET analysis. The effects of different substrate concentration, effects of solution temperature, and effects of catalyst amount were studied for the hydrogen generation rate. Additionally kinetic parameters were studied. The activation energy was 22.978 kJ/mol and H-2 generation rates were calculated as 952.5 mmol H-2/g(cat). min and 614.4 mmol H-2/g(cat). min at 50 degrees C and 30 degrees C respectively for sodium borohydride hydrolysis reaction. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Ruthenium-Imine catalyzed KBH4 hydrolysis as an efficient hydrogen production system
    (Pergamon-Elsevier Science Ltd, 2021) Kilinc, Dilek; Sahin, Omer
    The present study focused on the increasing of hydrogen evolution through hydrolysis of potassium borohydride in the presence of Ruthenium complex catalyst. It is the first time to use the Ru-Imine complex catalyst in KBH4 hydrolysis reaction to hydrogen evolution. The new Ru complex was synthesized from the tetradentate Imine ligand namely 4,4'-methylenebis (2,6-diethyl)aniline-3,5-di- tert-butylsalisylaldimine and Ru salt under the inert atmosphere. Ru-Imine complex was fully characterized by Elemental Analysis, Infrared Spectroscopy, Scanning Electron Microscope, X-Ray Diffraction Analysis, Brunauer-Emmett-Teller Surface Area Analysis and Transmission Electron Microscopy. By the synthesized Ru-Imine complex catalyst, the potassium borohydride hydrolysis reaction resulted in a lower energy barrier with 20,826 kJ/mol activation energy (Ea) for nth order kinetic model and 18,045 kJ/mol for Langmuir-Hinshelwood (L-H) kinetic model. According to the results Ru-complex was highly active and stable catalyst in KBH4 hydrolysis reaction to hydrogen evolution with 45,466 mL H-2/gcat.min and 76,815 mL H-2/gcat.min hydrogen generation rates at 30 degrees C and 50 degrees C respectively. Moreover Ru-Imine complex catalyst displayed 100% stability even at fifth recycle. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Salicylaldimine-Ni complex supported on Al2O3: Highly efficient catalyst for hydrogen production from hydrolysis of sodium borohydride
    (Pergamon-Elsevier Science Ltd, 2018) Kilinc, Dilek; Sahin, Omer; Saka, Cafer
    In this study, the Ni-based complex catalyst containing nickel of 1% supported on Al2O3 is used as for the hydrogen production from NaBH4 hydrolysis. The maximum hydrogen production rate from hydrolysis of NaBH4 with Ni-based complex catalyst supported on Al2O3 containing nickel of 1% is 62535 ml min(-1) g(-1) (complex catalyst containing 1 wt% Ni). The resulting complex catalyst is characterised by XRD, XPS, SEM, FT-IR, UV, and BET surface area analyses. The Arrhenius activation energy is found to be 27.29 kJ mol(-1) for the nickel-based complex catalyst supported on Al2O3. The reusability of the catalyst used in this study has also been investigated. The Ni-based complex catalyst supported on Al2O3 containing nickel of 1% is maintained the activity of 100% after the fifth use, compared to the first catalytic use. The n value for the reaction rate order of NaBH4 is found to be about 0.33. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    Synthesis of polymer supported Ni (II)-Schiff Base complex and its usage as a catalyst in sodium borohydride hydrolysis
    (Pergamon-Elsevier Science Ltd, 2018) Kilinc, Dilek; Sahin, Omer
    Influence of using as catalysis, Ni-Schiff Base complex which we previously synthesized [1] used to support with amberzyme oxirane resin (A.O.R.) polymer for increasing the catalytic activity in NaBH4 hydrolysis reaction, to hydrogen generation was studied. The prepared catalyst was characterized by using SEM, XRD, BET, FT-IR analyze technique. Polymer supported Ni-Schiff Base complex catalyzed NaBH4 hydrolysis reaction was investigated depending on concentration of NaBH4, concentration of NaOH, temperature, percentage of Ni complex in total polymer supported Ni-Schiff Base complex and amount of catalyst factors. The maximum hydrogen production rate from hydrolysis of sodium borohydride with nickel-based complex catalyst compared to the pure nickel catalyst is increased from 772 mL H-2.g(-1) cat.min(-1) to 2240 mL H-2.g(-1) cat.min-1 [1], and with supported amberzyme oxirane resin polymer this nickel based complex catalyst was increased to 13000 mL H-2.g(-1) cat. min(-1) at 30 degrees C. The activation energy of complex catalyzed NaBH4 hydrolysis reaction was found as 25.377 kJ/mol. This work also includes kinetic information for the hydrolysis of NaBH4. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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    The orthopalladation dinuclear [Pd(L1)(?-OAc)]2, [Pd(L2)(?-OAc)]2 and mononuclear [Pd(L3)2] complexes with [N, C, O] or [N, O] containing ligands: Synthesis, spectral characterization, electrochemistry and catalytic properties
    (Elsevier Science Sa, 2010) Kilic, Ahmet; Kilinc, Dilek; Tas, Esref; Yilmaz, Ismail; Durgun, Mustafa; Ozdemir, Ismail; Yasar, Sedat
    Treatment of the salicylaldimine ligands (L1H, L2H, L3H, L4H and L5H) with palladium(II) acetate in absolute ethanol gave the orthopalladation dinuclear [Pd(L-1)(mu-OAc)](2), [Pd(L-2)(mu-OAc)](2) and mononuclear [Pd(L-3)(2)] with the tetradentate ligands [N, C, O] or [N, O] moiety. The ligands L1H and L2H are coordinated through the imine nitrogen and aromatic ortho carbon atoms, whereas the ligand L3H coordinated through the imine nitrogen and phenolic oxygens atoms. The Pd(II) complexes have a square-planar structure and were found to be effective catalysts for the hydrogenation of both nitrobenzene and cyclohexene. These metal complexes were also tested as catalysts in Suzuki-Miyaura coupling of aryl bromide in the presence of K2CO3. The catalytic studies showed that the introduction of different groups on the salicyl ring of the molecules effected the catalytic activity towards hydrogenation of nitrobenzene and cyclohexene in DMF at 25 and 45 degrees C. The Pd(II) complexes easily prepared from cheap materials could be used as versatile and efficient catalysts for different C-C coupling reactions (Suzuki-Miyaura reactions). The structure of ligands and their complexes was characterized by UV-Vis, FT-IR, H-1 and C-13 NMR, elemental analysis, molar conductivity, as well as by electrochemical techniques. (C) 2009 Elsevier B.V. All rights reserved.
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    Use of low-cost Zn(II) complex efficiently in a dye-sensitized solar cell device
    (Springer, 2019) Kilinc, Dilek; Sahin, Omer; Horoz, Sabit
    The Zn(II) metal Schiff-base complex was synthesized by the cost-effective chemical precipitation technique. It was determined that Zn(II) metal Schiff-base complex was polycrystalline and nano-sized (21.43nm) by XRD analysis. This metal complex with polycrystalline structure was used as a sensitizer in organic dye sensitized solar cell. As a result of the analysis, the power conversion efficiency value of this metal complex was found to be 0.73. Although the solar cell performance of Zn(II) metal Schiff-base complex, which is synthesized by simple and inexpensive chemical methods, is low, it has been found to be of considerable importance when compared to the efficiency of expensive organic dyes.