Methanol steam reforming over silica aerogel supported catalyst for hydrogen production

Değirmencioğlu, Pınar
Our energy demand shows an increasing trend parallel to the increase in population. An important issue while we are meeting our energy need is that the source of energy should not pollute the environment. It is seen that hydrogen becomes a suitable choice as energy source when the fact that depletion of fossil fuels is considered. Hydrogen, which is not found in pure form in nature, is to be produced by some methods. In this study, hydrogen was produced from methanol steam reforming reaction. By doing so, maximum 3 moles of hydrogen can be produced per mole of alcohol. Type of the catalyst support is an important parameter that affects the performance of the catalyst during alcohol reforming reactions. A mesoporous catalyst support, silica aerogel, is synthesized by following sol-gel technique and after that convenient type of metal (Cu, Zn, etc.) was loaded into this support via wet impregnation method. Metal loaded catalysts are first calcined, then reduced and finally placed in reaction environment in order to obtain a long term stable catalyst which will provide obtaining hydrogen gas with very low side product content. It was seen that methanol conversion increased with an increase in calcination temperature, and the highest methanol converison (86.1%) is reached with the catalyst calcined up to 700°C, namely 10Cu-SA Air/Ar 700. The best result in methanol steam reforming at 280°C is obtained from 15Cu-SA Air/Ar 700 catalyst which provided 2.75 average hydrogen yield, 92.1% methanol conversion and 3.6% coke formation. Adsorbents such as huntite and hydrotalcite were used to capture the side product CO2, in methanol steam reforming reactions and the best result was obtained with hydrotalcite which captured CO2 for 55 minutes when mixed with 15Cu-SA Air/Ar 700 at 200°C in 1/15 weight base. It was seen that 15Cu-SA Air/Ar 700 was a stable and regenerable catalyst.


Hydrogen adsorption on CU (I)-exchanged zeolites
Altıparmak, İsmihan; İpek Torun, Bahar; Üner, Deniz; Department of Chemical Engineering (2019)
The growing population of the world increases the energy demand exponentially; necessitating utilization of a clean and renewable energy source. In this manner, H2 is a prominent candidate to be the future fuel by having gravimetrically high energy density, provided that a new lightweight, safe and economical onboard hydrogen storage system is developed for H2 fueled fuel cell vehicles. In this thesis, Cu(I)exchanged micro- and meso-porous zeolites (Cu(I)-[B]-ZSM-5, Cu(I)-[Al]-ZSM-5, mesoporous Cu(I)-[B]-ZS...
Yerleşik Sistem Yakıt Pillerinde Hidrojen İhtiyacının Karşılanması İçin Süreç, Yakıt ve Katalizör Sistemi Tasarımı
Sezgi, Naime Aslı; Doğu, Timur(2018)
Giderek artan nüfusa paralel olarak enerji gereksinimimiz de her geçen gün artısgöstermektedir. Enerji ihtiyacımızı karsılarken kullanılacak enerji kaynaklarının çevreyikirletmemesi önemli bir konudur. Fosil yakıtların giderek azaldıgı gerçegi de göz önündebulunduruldugunda hidrojenin enerji alternatifleri arasında uygun bir seçenek oldugugörülmektedir.Dogada saf olarak bulunmayan hidrojenin çesitli yöntemlerle elde edilmesi gerekir; bu çalısmakapsamında alkol reformlama reaksiyonu ile etanol veya metanolde...
Sorption enhanced reforming of ethanol over novel catalysts and microwave reactor application
Sarıyer, Merve; Sezgi, Naime Aslı; Doğu, Timur; Department of Chemical Engineering (2018)
Environmental concerns and fast depletion of fossil fuel resources increased the research activities for the production of hydrogen from renewable sources. Hydrogen production through ethanol steam reforming reaction (SRE) has the potential to be used for its on board production on vehicles and with the sorption enhanced process (SESRE), use of CaO for in-situ removal of produced CO2 increases hydrogen production, decreasing the carbon dioxide and carbon monoxide amount. In this study nickel impregnated SBA...
Nutritional Level Physical and Human Capital Complemantarity within Labor Augmenting Solow Type Model
Erdil, Erkan (2009-01-01)
One of important issue in economic growth is whether the convergence occurs. Besides occurrence of convergence, another important problem in the theory of economic growth is whether the growth of output per capita depends on the ratio of physical to human capital (K/H). This paper provides evidence for imbalance effects of (K/H) on growth rate besides convergence issue in a sample of 36 countries. This dependence tends to change in size of convergence rate where with the conditions on (K/H) ratio, convergen...
Solar irradiation on the rear surface of bifacial solar modules: a modeling approach
Durusoy, Beyza; ÖZDEN, TALAT; Akınoğlu, Bülent Gültekin (Springer Science and Business Media LLC, 2020-08-01)
The transition in the energy sector has started with the growing population leading to the growing energy demands. The use of photovoltaic (PV) technologies has become a crucial way to meet energy demand. There are many ongoing studies for increasing the efficiency of commercial PV modules. One way to increase the energy yield of the PV modules is to use bifacial solar panels by capturing the rear side illumination as well. One of the challenges for estimating the bifacial module performances is to calculat...
Citation Formats
P. Değirmencioğlu, “Methanol steam reforming over silica aerogel supported catalyst for hydrogen production,” M.S. - Master of Science, Middle East Technical University, 2018.