I.N.G. Wardana
Abstract
This study aims to utilize of bio material to produce green hydrogen energy through hybrid of the activated carbon and the CuO catalyst in vegetable oil steam reformer. The experiment was done in the atmospheric pressure steam reformer. The results show that activated carbon and CuO individually performs ...
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This study aims to utilize of bio material to produce green hydrogen energy through hybrid of the activated carbon and the CuO catalyst in vegetable oil steam reformer. The experiment was done in the atmospheric pressure steam reformer. The results show that activated carbon and CuO individually performs the same trend in producing hydrogen. Their combination accelerates hydrogen production. This indicates that heat energy makes CuO alters the electron density around the reactant by combining the van der Waals force with the induction due to electron jump in its narrow ban gap. Therefore, CuO activate effectively the polar water (H2O) molecules. More energy is needed to alter the electron in stable large molecule triglyceride of vegetable oil. On the other hand, the activated carbon does it by combining the van der Waals force with the induction due to delocalized of the pi electrons travelling between carbon atoms in the graphite structure. Consequently, only the nonpolar triglyceride molecules are attracted while the polar H2O are repelled by hydrophobic force. Thus, larger energy is needed to activate electrons in H2O. When they are combined, the CuO works only on H2O while activated carbon does only on triglyceride which is highly effective. Copyright © 2018 VBRI Press.
María N. Delpupo; Mariano N. Inés; Graciela A. Mansilla
Abstract
Hydrogen embrittlement is a common, dangerous, but poorly understood cause of failure in metals and alloys. In coated samples, coatings act as a barrier to hydrogen damage resulting in a decrease in the corrosion rate and consequently reducing hydrogen embrittlement. In order to obtain an effective barrier ...
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Hydrogen embrittlement is a common, dangerous, but poorly understood cause of failure in metals and alloys. In coated samples, coatings act as a barrier to hydrogen damage resulting in a decrease in the corrosion rate and consequently reducing hydrogen embrittlement. In order to obtain an effective barrier against the hydrogen income the layer must be continuous, impermeable and stable in the environment so adequate variable control must be followed. Knowledge about absorption/desorption energies of hydrogen from traps as a function of temperature help to design proper thermal treatments to eliminate it. This paper represents a survey about variables involved at each electroplating stage and hydrogen income into steel wires, analyzed through optical microscopy, scanning electron microscopy and thermal analysis. Copyright © 2018 VBRI Press.
Peteris Lesnicenoks; Liga Grinberga; Laimonis Jekabsons; Andris Antuzevičš; Astrida Berzina; Maris Knite; Gatis Taurins; Šarūnas Varnagiris; Janis Kleperis
Abstract
Hydrogen storage is one of the main problems, to catalyse wide hydrogen use in transportation, technology and energetics. Composites involving nanostructured carbon species could be the solution for hydrogen storage problem because of their promising surface/volume relation. Not only catalysis and gas ...
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Hydrogen storage is one of the main problems, to catalyse wide hydrogen use in transportation, technology and energetics. Composites involving nanostructured carbon species could be the solution for hydrogen storage problem because of their promising surface/volume relation. Not only catalysis and gas sensing on graphene basis should be considered, but also metal decorated graphene structures for use in hydrogen storage should be an active field for research and development. Heat conductivity and large surface area of graphene-like materials can endorse research for hydrogen storage in low pressures and close to room temperature (RT) conditions - increasing possibility for RT-range devices in hydrogen energetics. For increased hydrogen storage investigations, we propose metal intercalated graphene structures, acquired during synthesis of graphene sheets. Intercalation, or decoration of graphene surfaces and edges have shown possibility to stabilize defects in graphene sheets. Graphene defects have shown to be sensitive against hydrogen gas and might as well prove themselves stable enough to achieve low pressure hydrogen storage. A simple method is proposed for synthesis of graphene sheet stacks (GSS). There is lack of research for synthesis of carbon nanomaterials from industrial graphite waste. Our research for stabilization of electrolyte solution and increased production amounts for hydrogen accepting samples continues. Copyright © 2018 VBRI Press.
K. Srilatha; D. Bhagawan; V. Himabindu
Abstract
Hydrogen is an environmental friendly fuel, which has the potential to significantly used of fasil files; however several important challenges must defeat before it can be extensively used. Thermo catalytic decomposition of methane (TCD) is one of the most useful method, which will meet the future demand ...
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Hydrogen is an environmental friendly fuel, which has the potential to significantly used of fasil files; however several important challenges must defeat before it can be extensively used. Thermo catalytic decomposition of methane (TCD) is one of the most useful method, which will meet the future demand and hence an attractive route for COx free production of hydrogen which is essential in fuel cell. In the present study, we made an attempt on hydrogen production with Cu-Al2O3 and 5, 10, 15 & 20wt% of Ni modified Ni/Cu-Al2O3 catalysts. It is also observed that, the conversion order is Cu-Al2O3<5 wt% Ni/Cu-Al2O3 ~ 20 wt% Ni/Cu-Al2O3 <15 wt% Ni/Cu-Al2O3 < 10 wt% Ni/Cu-Al2O3 catalysts. It is observed that, while increasing the loadings of nickel in Ni/Cu-Al2O3 the efficiency of thermo catalytic decomposition of methane is also increasing. Among five catalysts prepared the 10wt% Ni/Cu-Al2O3 catalyst is showing good catalytic activity.SEM images of catalysts after thermo catalytic decomposition of methane shows the formation of carbon nanofibers. XRD patterns of the Cu-Al2O3 and 5,10,15 & 20wt%Ni/Cu-Al2O3 catalysts revealed, fairly crystalline peaks of which may responsible for the increase in the catalytic life and the formation of carbon nanofibers. The optimum hydrogen production of 70 volume % was observed with 10 wt% Ni/Cu-Al2O3 catalyst along with hydrogen carbon fibers were also found, which can be used as catalyst support. Copyright © 2016 VBRI Press.