Ankara, Turkey
Ankara, Turkey

Gazi University is a public university primarily located in Ankara, Turkey.It was established in 1926 by Mustafa Kemal Atatürk as Gazi Teacher Training Institute. In 1982, it was reorganized by merging with the Bolu Academy of Engineering and Architecture, Ankara Academy of Economics and Commercial science, the Ankara College of Technical Careers, the Ankara Girls' College of Technical Careers, and the Ankara State Academy of Engineering and Architecture to become a large metropolitan university as part of the act which created the Board of Higher Education. Prior to 1982 when the Board of Higher Education Law came into effect, institutes of higher education in Turkey were organized under different structures as universities, academies, institutes, and schools. In 1992 faculties and vocational schools in Bolu became Abant Izzet Baysal University.Gazi University comprises 21 faculties, 4 schools, 11 vocational schools of higher education, 48 research centers and 7 graduate institutes. The student enrollment of Gazi University has reached approximately 77,000 in total of whom about 1,500 come from the Turkic states of Central Asia. Five thousand students are enrolled in graduate programmes. The total size of the teaching faculty exceeds 3,000 persons. Wikipedia.

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Ozbayoglu A.M.,TOBB University of Economics and Technology | Kasnakoglu C.,TOBB University of Economics and Technology | Gungor A.,Akdeniz University | Biyikoglu A.,Gazi University | Uysal B.Z.,Gazi University
Journal of the Faculty of Engineering and Architecture of Gazi University | Year: 2013

A cascaded model is proposed for SYNGAS refinement. The first stage has a bypass outlet to transfer some SYNGAS to the output. Also, both stages have adjustable steam inputs controlling the amount of steam supply to both reactors separately; hence SYNGAS characteristics at the output can take the desired form. Satisfying the constraints of H2/CO ratio at reactor exit was emphasized. SYNGAS composition fed into the first stage characterizes the overall behavior. Hence, the structured model has the capability to refine any SYNGAS composition by identifying the proper process parameters of a given coal type for desired SYNGAS properties. The model was tested with three different coal types, and in each case the best bypass values and steam ratios were obtained.

Document Keywords (matching the query): coal gasification, water gas shift reactor, water gas shifts, synthesis gas refinement, syngas composition, gas characteristics, synthesis gas, syngas characteristics, water gas shift.


Mustu H.,Gazi University | Arbag H.,Gazi University | Yasyerli S.,Gazi University | Yasyerli N.,Gazi University | And 2 more authors.
Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 | Year: 2013

Ni impregnated mesoporous zirconia materials were synthesized following two different hydrothermal routes using two different templates, namely Pluronic 123 and CTMABr. Results proved formation of mesoporous zirconia, having a surface area of 209 m7g in the case of using P-123 as the surfactant. In the case of using CTMABr as the surfactant the surface area of zirconia was less. Activities of 5 % wt Ni impregnated zirconia materials were close to each other in dry reforming of methane. These materials showed quite stable activity during dry reforming at 600°C. The CO to hydrogen ratio obtained at the reactor outlet stream was about 1.6, indicating strong contribution of reverse water gas shift reaction. However, XRD and TGA results proved that zirconia supported Ni catalysts and especially the material synthesized by using P-123 as the surfactant, were highly coke resistant.

Document Keywords (matching the query): reverse water gas shift reaction.


Arbag H.,Gazi University | Yasyerli S.,Gazi University | Yasyerli N.,Gazi University | Dogu G.,Gazi University
International Journal of Hydrogen Energy | Year: 2010

Ni incorporated and Ni-Rh incorporated bimetallic MCM-41 like mesoporous catalysts, which were synthesized following a one-pot hydrothermal procedure, showed very high activity in dry reforming of methane. Among the Ni incorporated catalysts, Ni-MCM-41-V, with a Ni/Si ratio of 0.19, showed the best catalytic performance. Rh incorporation into this catalyst by the one-pot procedure improved both activity and time on stream stability of the catalyst. However, Rh incorporation by impregnation caused instabilities due to coke formation, after about 11 h of reaction time. Occurrence of reverse water gas shift reaction caused higher CO selectivity than H2 selectivity, with the Ni incorporated catalysts. Rh incorporation into these catalysts decreased the relative significance of reverse water gas shift reaction, with respect to dry reforming reaction. © 2009 Professor T. Nejat Veziroglu.

Document Keywords (matching the query): chemical shift, reverse water gas shift reaction.


Dogu G.,Gazi University | Sarer E.,Gazi University | Yasyerli N.,Gazi University | Yasyerli S.,Gazi University
ACS National Meeting Book of Abstracts | Year: 2011

Dry reforming of methane is a promising method of synthesis gas production with a H 2/CO ratio suitable for the synthesis of hydrocarbons. Development of active and stable catalysts with low carbon deposition is the key factor in realization of this reaction for industrial applications. In this study, Ru-Ni incorporated MCM-41-like silicate structured mesoporous catalysts having different Ru/Ni ratios were synthesized following a one-pot hydrothermal procedure and activities of these catalysts were tested in dry reforming of methane. Characterization results showed well dispersion of Ni and Ru within the high surface area catalysts having ordered pore structures. Methane dry reforming reaction results showed significant increase of catalyst activity and stability by Ru incorporation. Ru incorporation also increased hydrogen yield and decreased contribution of reverse water gas shift reaction. Methane conversion values close to equilibrium and CO/H 2 ratios close to one were obtained with Ru-Ni incorporated catalysts at a temperature of 600°C.


Yasyerli S.,Gazi University | Filizgok S.,Gazi University | Arbag H.,Gazi University | Yasyerli N.,Gazi University | Dogu G.,Gazi University
International Journal of Hydrogen Energy | Year: 2011

Nickel incorporated MCM-41-like mesoporous materials, which were synthesized following a one-pot hydrothermal route, were promoted by Ru and Mg in order to improve their catalytic performances for dry reforming of methane. In this study, Ni-MCM-41 based catalysts (with a Ni/Si molar ratio of 0.2), containing different amounts of Ru (0.5-3.0 wt%) and Mg (1 and 5 wt%) were prepared by using sequential impregnation of Ru and Mg into Ni-MCM-41. Dry reforming of methane was studied in a tubular flow reactor in the temperature range of 500-600 °C with different CH 4/CO 2 ratios in the feed stream. Quite high hydrogen yield values and improved stability of these catalysts indicated the promoting effects of Ru for the Ni-MCM-41 type catalysts. Ru incorporation (1.0% Ru) was shown to improve H 2 yields. Mg impregnation into 1.0Ru@Ni-MCM-41 improved catalytic performance by increasing CH 4 conversion and decreasing the contribution of reverse water gas shift reaction, especially at initial times (first 60 min). Coke formation by decomposition of CH 4 contributed to the hydrogen selectivity, but did not cause significant change in catalytic performance, especially at longer reaction times. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Document Keywords (matching the query): synthesis gas, chemical shift, reverse water gas shift reaction.

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