Doğu, Doruk
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Doruk, Doğu
Dogu,Doruk
Dogu,D.
Doruk Doğu
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D.,Doruk
Dogu, Doruk
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D.,Dogu
D., Dogu
Doğu, Doruk
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Doğu,D.
Dogu,Doruk
Dogu,D.
Doruk Doğu
Doruk, Dogu
D., Doğu
D.,Doruk
Dogu, Doruk
D., Doruk
D.,Dogu
D., Dogu
Doğu, Doruk
D.,Doğu
Doğu,D.
Job Title
Doktor Öğretim Üyesi
Email Address
doruk.dogu@atilim.edu.tr
Main Affiliation
Metallurgical and Materials Engineering
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2
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11
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14
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6
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16
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17
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15
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10
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7
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2
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8
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4
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12
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0
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3
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0
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13
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2
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13
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527
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7
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15
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535
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5
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4
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20/315
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1
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1
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1
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0.20
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0.00
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2
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| Journal | Count |
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| Research on Chemical Intermediates | 2 |
| Solid State Ionics | 1 |
| Turkish Journal of Chemistry | 1 |
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5 results
Scholarly Output Search Results
Now showing 1 - 5 of 5
Article Citation - WoS: 1Outperformance of CaO-Incorporated Alumina-Supported Pd Catalysts in Methanol Decomposition(Springer, 2025) Eryildirim, Busra; Oktar, Nuray; Dogu, DorukThis study aimed to investigate the impact of CaO incorporation to alumina-supported Pd catalysts on the methanol decomposition reaction. For this purpose, mayenite, alumina and/or calcium oxide-supported Pd catalysts were synthesized. The synthesized catalysts were characterized by XRD, FTIR, Laser Raman spectroscopy, N2 adsorption-desorption, pyridine adsorbed DRIFTS, CO2-TPD, XPS, SEM-EDS, and ICP-OES techniques. Catalytic activity tests were carried out over a 6 h reaction period in the range of 100-400 degrees C. The results of the characterization and activity tests showed that the addition of CaO had significant effects on the physicochemical properties of the catalyst as well as on the catalytic activity. By adding CaO to the alumina support material, the acidity was reduced, thus reducing the selectivity for dimethyl ether (DME) formation, which is significantly high for the 1Pd@Al2O3 catalyst, and increasing the H2 and CO selectivity. The mayenite-supported catalyst (1Pd@SGM), which contains alumina and calcium oxide in its unique crystal structure, showed an excellent catalytic performance close to complete methanol conversion with DME selectivity below 1% at 400 degrees C. In the stability test carried out at 350 degrees C for 6 h with 1Pd@Al2O3, 1Pd@SGM, and 1Pd@48CaO@Al2O3 catalysts used in the temperature scan, it was concluded that all catalysts were stable and 1Pd@SGM catalyst showed higher catalytic activity than the others.Master Thesis Nitrit İletken Katı Elektrolitler Üretmek için İtriya ile Stabilize Edilmiş Zirkonya'nın Elektrokimyasal Olarak Nitritlenmesi(2023) Öztürk, Onur; Doğu, DorukDünya nüfusunun giderek artması küresel anlamda olumlu veya olumsuz olmak üzere birçok etkiye sahip olmaktadır. Artan nüfus sebebiyle kişi başına düşen karbon salınım miktarı da artış göstermektedir. Karbon salınımı bu şekilde artış göstermeye devam ettiği taktirde dünya ortalama sıcaklığı 2050 yılına kadar 4 °C artış gösterecektir. Ülkemizin de imzalamış olduğu Paris İklim Anlaşması ile bu sıcaklık 2 °C 'lerde tutulmaya çalışılmaktadır. Amonyak gıda sektöründen enerji sektörüne kadar birçok alanda kullanılan Dünya'da en çok üretimi yapılan 2. kimyasaldır. Amonyak üretimi halihazırda Haber-Bosch adı verilen bir proses ile yapılmaktadır. Bu proses yüksek sıcaklık ve basınçta gerçekleşmektedir. Buna bağlı olarak da enerji ihtiyacı yüksek olmakla birlikte karbon salınım miktarı da yüksek olan bir üretim yöntemidir. Bilim insanları bu sebeplerden dolayı alternatif üretim yöntemleri araştırmaktadırlar. Amonyak üretiminin elektrokimyasal yöntemler kullanılarak yapılması alternatifler arasında en umut vadeden yöntemlerdendir. Bu sistemler amonyağın düşük basınç değerlerinde üretilmesini sağlamaktadırlar. Aynı zamanda bu sistemlerin kolayca ölçeklendirilebilir olması da bir başka avantajıdır. Bu yöntemler, amonyak üretiminin ihtiyaç duyulan yerde, yerinde ve ihtiyaca göre yapılmasını sağlar ve bu sayede büyük bir enerji tasarrufunun da olmasını sağlamaktadırlar. Yüksek sıcaklık katı oksit elektrolitler kullanılarak yapılan üretim yöntemi en çok rağbet gören yöntemlerdendir. Halihazırda katı oksit elektrolitler kullanılarak yapılan çalışmalarda oksit iletken elektrolitler ve proton iletken elektrolitler kullanılmaktadır. Her iki sistemde hidrojen kaynağı olan su buharı veya hidrojenin iyonlaşarak azotla tepkimeye girmesini amaçlamaktadır. Fakat burada azot atomları arasındaki güçlü üçlü bağ sebebiyle iyonlaşan hidrojenler azot ile tepkimeye girmek yerine tekrar kendi aralarında birleşerek H2 ye dönüşmektedirler. Bu da amonyak üretim oranı ve seçiciliğini azaltmaktadır. Diğer taraftan, nitrit iletken elektrolitler kullanıldığı taktirde, nitrojen reaksiyon bölgesine iyon halinde beslenebilir ve hidrojen tekrar birleşmesini azaltarak amonyak seçiciliğini arttırabilir. Bu tez kapsamında yukarıda bahsedilen üretim yöntemlerindeki problemi de çözebilecek aynı zamanda ilk defa üretilecek nitrit iletken elektrolitler geliştirilmiştir. Öncelikle reaksiyon sisteminin kurulumu ve tasarımı yapılmış daha sonra Autodesk Inventor 2019 yardımıyla reaktör dizaynı yapılmıştır. Reaktör üretiminde 310 paslanmaz çelik malzemesi kullanılmıştır. Sistemde sızdırmazlık malzemesi olarak cam sızdırmazlık malzemesi ve crofer mesh kullanılmıştır. Deneyler 550 °C sıcaklıkta gerçekleşmiştir. Farklı kalınlıktaki 8%YSZ elektrolitler (127-140-270 µm) kullanılarak yapılan ve LSM-YSZ (simetrik hücre) katalizör kullanılarak yapılan deneylerde nitrojen iyonu iletimi test edilmiştir. Bu deneyler gerçekleşirken 0.1-300 mA arasında akım taraması yapılmıştır yüksek akımlarda ise elektrolitin çatladığı gözlemlenmiştir. Tüm deneylerde katot tarafından 15 sccm N2 anot tarafına ise 20 sccm He gazı beslenmiştir. Anot gaz çıkışı kütle spektrometresine bağlanmıştır ve burada sinyaller takip edilmiştir. 200 mA civarından itibaren nitrojen iyon transferinin başladığı gözlemlenmiştir. Farklı akımlarda 40 dakika arayla alınan verilerle birlikte faradaik verim hesabı yapılmış ve maksimum verim 300 mA akım değerinde 40% civarında bulunmuştur. Bu çalışmalara ek olarak N-Mayenit ve Ce katkılı LaFeO3 anot katalizörleri kullanılarak da elektrokimyasal nitritleme çalışmaları yapılmıştır. Elektrokimyasal nitritleme çalışmasının yanında toz nitritleme çalışmaları da yapılmıştır. %8 YSZ ve ZrO2 tozlarının farklı sıcaklık, süre ve akış hızları altında N2 zengin atmosferde nitritlenmesi denenmiştir. Bunlara ek olarak ZrO2 tozu karbotermik indirgeme yöntemi ile de indirgenmeye çalışılmıştır.Article Comparison Between Gas Phase and Electrochemical Nitridation of 8ysz Under Nitrogen Atmosphere To Produce Nitride Conducting Solid Electrolytes(Elsevier, 2024) Ozturk, Onur; Dogu, DorukAmmonia is one of the most used chemicals in the world. It is commonly synthesized by the Haber-Bosch process which requires high temperature (450-500 degrees C) and pressure (up to 300 bar). This process is thermodynamically limited and causes environmental problems due to CO2 emissions caused by the production of H2 required by this process from fossil fuels. Electrocatalytic processes using oxide and proton-conducting electrolytes are gaining interest for ammonia production to overcome these limitations. Although both methods overcome many of the problems associated with the Haber-Bosch process, due to strong N-N triple bonds selectivity towards ammonia decreases. This is because the reaction occurs on the same side of the membrane electrode assembly, namely the cathode electrode, where nitrogen is fed in the gas phase and nitrogen bonds should be broken to react with hydrogen ions readily available on the electrolyte surface. Since N-N bond cleavage requires very high energy, hydrogen ions generally recombine to form H2 before the nitrogen can be ionized. Nitride conducting electrolytes can be an answer to this problem because in their use nitrogen ionization and ammonia synthesis reactions occur at different electrodes and nitrogen is fed to the reaction site in the ionic form which is more active for the reaction. This study focuses on two alternative methods for the production of nitride conducting solid electrolytes by nitridation of 8 % Yttria Stabilized Zirconia (8YSZ). Two different methods for nitridation were studied: gas phase powder nitridation and electrochemical nitridation of YSZ electrolytes. This study shows that although gas phase nitridation of YSZ powders at high temperatures under nitrogen is not efficient, electrochemical nitridation of YSZ electrolytes is a highly promising method to produce nitride conducting electrolytes.Article Biofuel Production From Model Bio-Oil: Impact of Perovskite-Based Catalysts and Metal Oxide Mixtures on Upgrading and Selectivity(Springer, 2026) Ozcan, Merve Celik; Dogu, Doruk; Oktar, NurayBiofuel production was conducted using model bio-oil to examine the upgrading performance of perovskite-based and metal oxide catalysts. Bare and Ce, Co, Sr, Mo, and tungstophosphoric acid-doped LaFeO3 perovskite-based catalysts were synthesized via sol-gel method. The bio-oil upgrading activity of commercial La2O3, alpha-Fe2O3, and alpha-Fe2O3/La2O3 metal oxide catalysts compared to LaFeO3-based catalyst was also investigated. Catalyst properties were characterized by XRD, TGA/DTG, N-2 adsorption/desorption, SEM-EDX, FTIR, DRIFTS, and Raman techniques. Activity tests were performed at 400 degrees C at under atmospheric pressure. A model bio-oil mixture was formulated with hydroxy propanone/formic acid/furfural (2:4:3 mass ratio), and a dilution ratio of 30:70 (bio-oil mixture/alcohol) was applied. Ethanol and methanol were examined as co-reactants. Ethanol-assisted upgrading resulted in higher deoxygenation efficiency and enhanced iso-paraffin selectivity compared to methanol. Increasing the calcination temperature of LaFeO3 from 700 to 800 degrees C improved crystallinity and raised the overall bio-oil conversion from 69.4 to 83.4%. The bare LaFeO3 catalyst calcined at 800 degrees C exhibited high iso-paraffin selectivity (69.4 vol%) and oil-phase selectivity (80.3%). The superior upgrading performance of LaFeO3 was attributed to its orthorhombic perovskite lattice structure and mild surface acidity, favoring cracking, deoxygenation, and coke suppression. Ce-doped LaFeO3 (x = 0.1) enhanced oxygen mobility and promoted olefin selectivity resulting in the highest overall bio-oil conversion (83.8%). At higher Ce contents (x = 0.2), CeO2 side-phase formation promoted naphthene selectivity. In contrast, Sr-, Co-, and Mo-doped LaFeO3 catalysts showed higher oxygenated content. Compared with alpha-Fe2O3/La2O3 mixed catalyst, which exhibited 16.0 wt% coke formation, LaFeO3 showed low coke deposition (0.24 wt%). Long-term stability testing of LaFeO3 revealed only a very small amount of carbon formation (1.39 wt%) and no catalyst deactivation. Similar product distributions were obtained in both short-term and long-term tests. [GRAPHICS]Article Influence of Synthesis Parameters on the Structural Formation of Mayenite via the Citrate Sol-Gel Method(Tubitak Scientific & Technological Research Council Turkey, 2025) Eryildirim, Busra; Oktar, Nuray; Dogu, DorukMayenite (Ca12Al14O33) has remarkable properties such as high oxygen mobility, ionic conductivity, and catalytic activity. It has many different applications, including oxide-conducting electrolytes, fluorescent lamps, moisture sensors, hydrogen-permeable membranes, oxygen pumps, hydrogen storage, and catalysis. However, pure and homogeneous mayenite synthesis parameters have not yet been fully explored. This study examines the effect of synthesis parameters including metal salt (MS) to citric acid (CA) molar ratios (1:1 and 1:2), pH (0.4-2), and calcination temperature (900-1200 degrees C) in citrate sol-gel method on the crystal structure of mayenite. Synthesized materials were examined by thermogravimetric (TG), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, N2 adsorption-desorption, scanning electron microscopy (SEM), inductively coupled plasma-optical emission spectrometry (ICP-OES), Fourier-transform infrared spectroscopy (FTIR), and pyridine adsorbed diffuse reflectance Fourier-transformed infrared spectroscopy (DRIFTS) analyses. The results show that all 3 parameters contribute to the mayenite phase formation and different impurity phases can be observed depending on the synthesis parameters. With no pH adjustment and an MS to CA ratio of 1, other phases of calcium aluminate mostly form. Mayenite becomes the main phase by doubling the CA amount. Besides CA, pH is also an important factor in mayenite synthesis. When the pH was adjusted to 2 with the MS to CA ratio at 1:1, mayenite was formed as the main phase, but other phases of calcium aluminate were also observed in the structure. XRD results show that all parameters studied influence the crystal structure of the final material, including the calcination temperature. This study shows that pure mayenite can be synthesized with a calcination temperature of 1200 degrees C, at a pH of 2, and the MS to CA molar ratio of 1:2.
