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001-es BibID:	BIBFORM062056
Első szerző:	Balla Zoltán (agrármérnök)
Cím:	Renewable energy from biomass: a sustainable option? : Hydrogen production from alcohols / Zoltán Balla, Károly Kith, András Tamás, Orsolya Nagy
Dátum:	2015
ISSN:	1029-7006 1607-7962
Megjegyzések:	Sustainable development requires us to find new energy sources instead of fossil fuels. One possibility is thehydrogen fuel cell, which uses significantly more efficient than the current combustion engines. The task of thehydrogen is clean, carbon-free renewable energy sources to choose in the future by growing degree. Hungary canplay a role in the renewable energy sources of biomass as a renewable biomass annually mass of about 350 to 360million tons. The biomass is only a very small proportion of fossil turn carbonaceous materials substitution, whilewe may utilize alternative energy sources as well. To the hydrogen production from biomass, the first step of thechemical transformations of chemical bonds are broken, which is always activation energy investment needs.The methanol and ethanol by fermentation from different agricultural products is relatively easy to produce, sothese can be regarded as renewable energy carriers of. The ethanol can be used directly, and used in several placesin the world are mixed with the petrol additive. This method is the disadvantage that the anhydrous alcohol is to beused in the combustion process in the engine more undesired by-products may be formed, and the fuel efficiencyof the engine is significantly lower than the efficiency of the fuel cells.More useful to produce hydrogen from the alcohol and is used in a fuel cell electric power generation. Particularlyattractive option for the so-called on-board reforming of alcohols, that happens immediately when the vehiclehydrogen production. It does not need a large tank of hydrogen, because the hydrogen produced would be directlyto the fuel cell. The H2 tank limit use of its high cost, the significant loss evaporation, the rare-station network,production capacity and service background and lack of opportunity to refuel problems. These can be overcome, ifthe hydrogen in the vehicle is prepared. As volume even 700 bar only about half the H2 pressure gas can be storedin the case, than the same volume of ethanol-water mixture can be prepared.The renewal of alcohol, the alcohol-water mixture is then passed through the catalytic reformer into a preheater.The exhaust gas contains a relatively large number of carbon monoxide, which would spoil the fuel cell, so thecarbon monoxide concentration to a high and a low temperature water-gas reaction is reduced. This increases thehydrogen production. The last step of the carbon monoxide content to eliminate preferential oxidation. The alcoholreforming catalyst for the precious metals spread most of what arose from high activity and stability. However, theprecious metals are very expensive, so a non-precious metal catalysts is the design and development of objectiveactivity and stability which reaches the precious metal catalysts of.Using the new reaction catalysts opportunities are created, which are smaller than the activation energy than thenon-catalytic process. The basic objective of the technological developments more active at lower temperatures,the selective target product, long-life, low cost design catalysts.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok idézhető absztrakt renewable energy
Megjelenés:	Geophysical Research Abstracts 17 (2015), p. [1]. -
További szerzők:	Kith Károly (1986-) (környezetkutató, ökológus) Tamás András (1986-) (gazdasági agrármérnök, növénytermesztés és kertészeti tudományok) Nagy Orsolya (1989-) (regionális tudományok)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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