| 词条 | Hydrogen purifier |
| 释义 |
A hydrogen purifier is a device to purify hydrogen if hydrogen production is done from hydrocarbon sources, the ultra-high purified hydrogen is needed for applications like PEM fuel cells . Palladium membrane hydrogen purifiersThe palladium membrane is typically a metallic tube of a palladium and silver alloy material possessing the unique property of allowing only monatomic hydrogen to pass through its crystal lattice when it is heated above 300°C.[1] Dense thin-metal membrane purifierDense thin-metal membrane purifiers are compact, relatively inexpensive and simple to use.[2][3][4] Pressure swing adsorptionPressure swing adsorption is used for the removal of carbon dioxide (CO2) as the final step in the large-scale commercial synthesis of hydrogen. It can also remove methane, carbon monoxide, nitrogen, moisture and in some cases, argon, from hydrogen. Catalytic recombination or deoxygenation purifierCatalytic recombination or deoxygenation is used to remove oxygen (O2) impurities. The process is also known as a 'deoxo' process. The oxygen reacts with the hydrogen to form water vapor, which can then be removed by a dryer if necessary. The catalysts that are used are based on platinum group metals (PGM). A typical system could handle up to 3% O2 in H2 in the feed, and reduce the O2 content to less than 1ppm.[5] Electrochemical purifierThe electrochemical purifier works similar to a fuel cell, a voltage is applied to the membrane and the resulting electric current pulls hydrogen through the membrane. A well designed system can simulanously compress the hydrogen. ApplicationsHydrogen purifiers are used in metalorganic vapour phase epitaxy reactors for LED production.[6] See also
References1. ^Advanced palladium membrane scale-up for hydrogen separation 2. ^Hydrogen purification membranes 3. ^Dense metal membranes for hydrogen purifying 4. ^Development of Pd Alloy hydrogen separation membranes with dense-porous hybrid structure for high hydrogen perm-selectivity 5. ^[https://www.scribd.com/doc/7201923/Solar-Hydrogen 45 Home Power #67 • October / November 1998] 6. ^[https://archive.today/20120910004432/http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VM5-4KMG63S-1S&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=1080053670&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=6864e7ca91c2ce9c7a7fb70b6e4cb181 Hydrogen purifiers proving vital to LED production] External links
4 : Hydrogen technologies|Chemical equipment|Industrial gases|Gas technologies |
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