Carbon dioxide storage mechanisms

Fig. 2. Vacuum line for work with oxygen-18 (diagrammatic only, not to scale) (A) microelectrolyzer (B) oxygen release mechanism (C) quartz oven (joined by graded seals) (D) carbon dioxide storage vessel (for equilibration) (E) measured volume and manometer (for equilibration) (F) Toepler pump (T) traps.

BiaxiaHy orieated PPS film is transpareat and nearly colorless. It has low permeability to water vapor, carbon dioxide, and oxygen. PPS film has a low coefficient of hygroscopic expansion and a low dissipation factor, making it a candidate material for information storage devices and for thin-film capacitors. Chemical and thermal stability of PPS film derives from inherent resia properties. PPS films exposed to tolueae or chloroform for 8 weeks retaia 75% of theh original streagth. The UL temperature iadex rating of PPS film is 160°C for mechanical appHcatioas and 180°C for electrical appHcations. Table 9 summarizes the properties of PPS film. 

In dry air the stability of zinc is remarkable. Once the protective layer of zinc oxide formed initially is complete, the attack ceases. Even under under normal urban conditions, such as those in London, zinc sheet 0 -8 mm thick has been found to have an effective life of 40 years or more when used as a roof covering and no repair has been needed except for mechanical damage. The presence of water does, of course, increase the rate of corrosion when water is present the initial corrosion product is zinc hydroxide, which is then converted by the action of carbon dioxide to a basic zinc carbonate, probably of composition similar to ZnCOj 3Zn(OH)2 . In very damp conditions unprotected zinc sometimes forms a loose and more conspicuous form of corrosion product known as wet storage stain or white rust (see p. 4.171). 

Compressed-air energy storage Corporate average fuel economy California Air Resources Board Coal-bed methane Combined cycle gas turbine Carbon/carbon dioxide capture and storage Clean development mechanism Chlorofluorocarbon Computable general equilibrium Compressed gaseous hydrogen Combined heat and power... 

Ceria and alumina, which form the intermediate porous layer (the washcoat) between the mechanical support and the supported metals and promotors, are important components in three-way catalysts (TWC) used for car exhaust gas cleaning. Although basie studies have been published on such systems [1], the interactions which can exist between alumina and eeria and which in turn may affect the interactions between the supported metal and the washcoat [2], are not fully understood. In particular, the multiple roles attributed to ceria, like stabilization of the alumina [3], of the supported metals [4], like storage and release of oxygen [2], are veiy probably dependent on preparation methods, activation and reaction conditions. Therefore, selective characterization of each oxide in ceria-alumina can be useful for a better imderstanding of the role played by both alumina and ceria in TWC. The present work describes two "ehemical methods", the adsorption of carbon dioxide followed by IR spectroseopy and the temperature-progranuned reduction (TPR), which lead to an estimation of the surface extent of alumina and ceria respectively. 

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