A methanol refomer is a device used in chemical engineering, especially in the area of fuel cell technology, which can produce pure hydrogen gas and carbon dioxide by reacting a methanol and water (steam) mixture. Chemical engineering is the branch of Engineering that deals with the application of Physical science (e A fuel cell is an electrochemical conversion device It produces electricity from Fuel (on the Anode side and an oxidant (on the Hydrogen (ˈhaɪdrədʒən is the Chemical element with Atomic number 1 Carbon dioxide ( Chemical formula:) is a Chemical compound composed of two Oxygen Atoms covalently bonded to a single Methanol, also known as methyl alcohol, carbinol, wood alcohol, wood naphtha or wood spirits, is a Chemical compound Water is a common Chemical substance that is essential for the survival of all known forms of Life.
Methanol is transformed into hydrogen and carbon dioxide by pressure and heat and interaction with a catalyst. Catalysis is the process in which the rate of a Chemical reaction is increased by means of a Chemical substance known as a catalyst
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A mixture of water and methanol with a molar concentration ratio (water:methanol) of 1. In Chemistry, concentration is the measure of how much of a given substance there is mixed with another substance 3 - 1. 5 is pressurized to approximately 20 bar, vaporized and heated to a temperature of 250 - 280 °C. The bar (symbol bar) decibar (symbol dbar) and the millibar (symbol mbar, also mb are units of Pressure. The Celsius Temperature scale was previously known as the centigrade scale. The hydrogen that is created is separated through the use of a hydrogen-permeable membrane made of a palladium and silver alloy. A semipermeable membrane, also termed a selectively-permeable membrane, a partially-permeable membrane or a differentially-permeable membrane, is a membrane Palladium (pronounced \pəˈleɪdiəm\ is a rare and lustrous silvery-white metal that was discovered in 1803 by William Hyde Wollaston, who named it palladium after the Silver (ˈsɪlvɚ is a Chemical element with the symbol " Ag " (argentum from the Ancient Greek: ἀργήντος - argēntos gen
There are two basic methods of conducting this process.
- The water-methanol mixture is introduced into a tube-shaped reactor where it makes contact with the catalyst. The hydrogen is then separated from the other reactants and products in a later chamber. A reagent or reactant is a substance or compound consumed during a Chemical reaction. The reformed material passes the PdAg membrane and most of the hydrogen passes through.
- The other variety features an integrated reaction chamber and separation membrane. In such a design the walls of the reaction chamber are made from a PdAg-coated ceramic cylinder and the hydrogen is thereby separated directly out of the reaction chamber. The word ceramic is derived from the Greek word κεραμικός ( keramikos)
With either design, not all of the hydrogen is removed from the product of the reaction, so the remaining gas mixture still contains a significant amount of hydrogen. As such, this resulting mixture is often mixed with air and burned. The heat energy produced by burning this mixture can be used for heating purposes.
Advantages and disadvantages
Methanol reformers are being considered as a component of a hydrogen fuel cell-powered vehicle. A prototype car, the NECAR 5, was introduced by Daimler-Chrysler in the year 2000. Daimler AG ( (formerly DaimlerChrysler AG) is a German car corporation (not to be confused with the British car-maker Daimler Motor Company) and The primary advantage of a vehicle with a reformer is that it does not need a pressurized gas tank to store hydrogen fuel; instead methanol is stored as a liquid. This could help ease the public's concern over the danger of hydrogen and thereby make fuel cell powered vehicles more attractive. However, methanol, like gasoline, is toxic and extremely flammable. The cost of the PdAg membrane and its susceptibility to damage by temperature changes provide obstacles to adoption.
Another problem is that although hydrogen power produces energy without CO2, a methanol reformer creates the gas as a byproduct. The high level of greenhouse gases in our atmosphere significantly contributes to global warming. Global warming is the increase in the average measured temperature of the
References
- Much of this article is a translation of the corresponding German-language article.
- Emonts, B. et al. : Compact methanol reformer test for fuel-cell powered light-duty vehicles, J. Power Sources 71 (1998) 288-293
- Wiese, W. et al. : Methanol steam reforming in a fuel cell drive system, J. Power Sources 84 (1999) 187-193
- Peters, R. et al. : Investigation of a methanol concept considering the particular impact of dynamics and long-term stability for use in a fuel-cell-powered passenger car, J. Power Sources 86 (1999) 507-514
External links
- Mikro-Anwendungen: Mikroreformer machen Wasserstoff aus Methanol
- Umwelt und Verkehr - Kraft-und Betriebsstoffe Methanol
- Forschungszentrum Jülich
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