Gazi University Dspace
Not a member yet
26981 research outputs found
Sort by
Çevrimiçi oyun oynayanların sosyodemografik özellikleri ve oyun bağımlılığının bazı psikososyal etmenlerle ilişkisi
No full textA multicenter study on epidemiological and clinical characteristics of 125 newborns born to women infected with COVID-19 by Turkish Neonatal Society (vol 46, pg 631, 2020)
No full textAISI T15 Çeliğinin İşlenmesinde PVD TiAlN + Al203 ve CVD TiCN+TiN Kaplama Performansının Araştırılması
No full text
Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect
No full textIn this study, microwave-assisted ammonia decomposition reaction was
investigated over molybdenum incorporated catalysts. Due to the
selective, volumetric, and noncontact heating properties of the
microwave system, higher conversion values could be achieved at
relatively lower reaction temperatures, which is important for on-site
COx-free hydrogen production. Multiwall carbon nanotube-supported
molybdenum catalysts were prepared following the impregnation procedure
with different metal loading (3.5\%-12.5\% wt\%), and inductively
coupled plasma, nitrogen physisorption, X-ray diffraction, and
transmission electron microscopic techniques were employed to
characterize the fresh and used samples. Reaction experiments were
performed under the flow of pure ammonia with a gas hourly space
velocity of 36,000 mL/g(cat) .h for both the microwave and
conventionally heated reaction systems. It was found that ammonia
conversion was obtained even at 400 degrees C, reaching 40\%, and total
conversion was observed even at 450 degrees C, while the activities of
these catalysts were negligible at a reaction temperature lower than 550
degrees C, in the conventional heated system, which included an
electrically heated furnace. Crystals of alpha-Mo2C as well as MoO2 were
observed in the structures of the synthesized catalysts and the
formation of nitride species was more easily observable under microwave
heating, possibly due to the nitridation of molybdenum carbide species
during the reaction
