4 results on '"Kıvrak, Hilal Demir"'
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2. A Critical Overview of the State-of-the-Art Methods for Biogas Purification and Utilization Processes
- Author
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Atelge, Muhamed Rasit, primary, Senol, Halil, additional, Djaafri, Mohammed, additional, Hansu, Tulin Avci, additional, Krisa, David, additional, Atabani, Abdulaziz, additional, Eskicioglu, Cigdem, additional, Muratçobanoğlu, Hamdi, additional, Unalan, Sebahattin, additional, Kalloum, Slimane, additional, Azbar, Nuri, additional, and Kıvrak, Hilal Demir, additional
- Published
- 2021
- Full Text
- View/download PDF
3. Carbon nanotube supported direct borohydride fuel cell anode catalysts: the effect of catalyst loading.
- Author
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Kıvrak, Hilal Demir, Caglar, Aykut, Hansu, Tulin Avcı, and Sahin, Omer
- Subjects
- *
DIRECT methanol fuel cells , *FUEL cells , *RENEWABLE energy sources , *ALTERNATIVE fuels , *CATALYSTS , *ENERGY dispersive X-ray spectroscopy - Abstract
Energy, vital and permanent need for human life and welfare, supplied by fossil fuels such as oil, coal, and natural gas through the world has been rising gradually. However, the employment of fossil fuels to supply energy need have several disadvantages such as shortage of fossil fuels and global warming caused via fossil fuel exhaust gases. To eliminate these disadvantages of fossil fuel consumption in energy generating systems, research studies are dedicated to the alternative energy sources such as fuel cells, batteries, solar energy, wind energy. Fuel cells are the most popular alternative energy devices and attributed great importance to recompense the rapidly increasing energy demand. Direct Borohydride Fuel Cells (DBFCs), known as a special group of an alkaline direct liquid fuel cell (DLFC). At present, monometallic CNT supported Pd electrocatalysts (Pd/CNT) are prepared at varying Pd loadings via sodium borohydride (NaBH4) reduction method to investigate their NaBH4 electrooxidation activities. These monometallic Pd/CNT catalysts are characterized by X-ray Diffraction (XRD), N2 adsorptiondesorption, X-ray photoelectron spectroscopy (XPS), and Scanning Electron Microscopy- Energy Dispersive X-ray analysis (SEM-EDX). NaBH4 electrooxidation measurements are performed with cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). The 30% Pd/CNT catalyst exhibits the highest electrochemical activity. By altering Pd loading, catalyst surface electronic structure changes significantly, leading to enhanced NaBH4 electrooxidation activity. As a conclusion, it is clear that Pd/CNT catalysts are good candidate as anode catalysts for direct borohydride fuel cells. [ABSTRACT FROM AUTHOR]
- Published
- 2020
4. Microwave assisted n-hexane reforming on Pt-based catalyst
- Author
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Salih, Mohammed Ali, Kıvrak, Hilal Demir, Kıvrak, Arif, and Kimya Mühendisliği Ana Bilim Dalı
- Subjects
Chemical Engineering ,Kimya Mühendisliği - Abstract
Bu çalışma, benzin kalitesinin geliştirilmesi ve CO sıyırma voltametrisi yardımıyla Pt ve Pt-Au metallerinin kirlilik etkisinin katalizörlerle tasfiye edilmesi üzerine dayalıdır. Karbon nanotüp (CNT) destekli Pt ve Pt-Au katalizörler kullanılarak n-hekzan azaltılmış ve oktan sayısı arttırılmıştır. Katalitik nafta reformasyonu; petrol arıtımı ve nafta ham maddesini benzin için önemli bir faktör olan yüksek oktanlı reformatlara dönüştürmede kullanılan önemli endüstriyel süreçlerden birisidir. Model materyaller birçok katalitik kimyasal reaksiyonda sentezlenmiş, karakterize edilmiş ve incelenmiştir. Nanopartiküller ve nanopartikülleri destekleyen diğer materyallerin büyüklüğü, biçimi ve kompozisyonu değiştirildiğinde 50:50.Pt-Au oranının reaksiyon aktivitesinde ve seçiciliğinde oldukça etkili olduğu görülmüştür. CNT destekli Pt ve Pt-Au katalizörleri NaBH4 indirgeme metodu tarafından dikkatli bir şekilde sentezlenmiştir. Bunun yanında katalizörler BET, EDX ve XRD araçları tarafından karakterize edilmiştir.Katalizörler NaBH4 indirgeme metodu kullanılarak hazırlanmıştır. Reaksiyon sıcaklığı 30 dakika boyunca 150°'de tutulmuştur. Katalizörler ayrıca XRD (x ışınları kırınımı), BET (Brunauer-Emmett-Teller), SEM-EDX (Küçük açılı x-ışınları saçılımı) gibi araçlar tarafından karakterize edilmiştir. Katalizör n-hekzan reformasyon performansı için oldukça yararlıdır. This study focused on the improvement of the quality of gasoline and enhancing Catalysts removing effect of contamination Pd and Pt-Au in as much as CO and upraise potential with CO stripping voltammetry. Practical aspects of catalyst deactivation with a focus on mechanisms of catalyst decay, prevention of deactivation, and regeneration of catalysts. Increasing octane number by the reduction of n-Hexane using Carbon nanotube (CNT) supported Pt and Pt-Au catalysts. Catalytic naphtha reforming is one of the key processes in petroleum refining, converting gasoline boiling range low-octane hydrocarbons to high-octane compounds which can be blended into gasoline. Other valuable by-products include hydrogen and cracked light gases. Model materials consisting of metal nanoparticles loaded onto oxide supports were synthesized, characterized, and investigated in a number of catalytic chemical reactions. By varying the size, shape, and composition of nanoparticle, as well as the material used to support the nanoparticles, it was found that 50 % Pt-Au changes to the catalyst can have enormous changes to the reaction activity and selectivity. CNT supported Pt and Pt-Au catalysts were carefully synthesized by NaBH4 reduction method. Furthermore, these catalysts were characterized by BET, EDX, and XRD. Catalysts were prepared by employing via using NaBH4 reduction method. Reaction temperature was kept at 150 °C for 30 minute. .Techniques discussed divided into synthetic, characterization. Synthetic techniques include nanoparticle and catalyst support material synthesis. Characterization includes various types of instruments X-Ray Diffraction X-RD, (Brunauer- Emmett-Teller) BET, SEM-EDX, Small angle X-ray scattering. The catalyst is very beneficial to the performance n hexane reforming activity. 57
- Published
- 2017
Catalog
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