Hydrogen release

Heat is produced during hydrogen absorption, and must be suppHed during its release. The weight of hydrogen that can be released from the hydride, about 1.5 wt %, requires approximately the same volume as Hquid hydrogen, but the hydride is much heavier. The hydrogen released from a hydride has a... [Pg.429]

Nascent atomic hydrogen released at metal surfaces by chemical reactions between the process environment and the metal (corrosion or cathodic protection reactions)... [Pg.257]

Nascent atomic hydrogen released by a process reaction such as catalytic desulfurization... [Pg.257]

Linney (1990) summarized the liquid hydrogen release tests performed by A. D. Little Inc. in 1958, by Lockheed in 1956-1957, and by NASA in 1980. Both high- and low-pressure releases were studied. None of the tests resulted in a blast-producing explosion. [Pg.75]

Corrosion processes in the boiler section generate hydrogen—this hydrogen release is regularly measured in very high pressure boilers as it can be indicative of the rate of corrosion taking place... [Pg.291]

Fig. 3.5 Potential vs. pH diagram for the CdTe-H20 system at 25 °C. Solid CdTe is thermodynamically stable over the entire pH range. Consequently, CdTe does not hydrolyze at any H and OH activities of practical interest. In acidic solutions, the only process accompanying cathodic CdTe polarization is hydrogen release. Therefore, in the region of cathode potentials, CdTe is a sufficiently stable electrode material from the electrochemical point of view. The -1.35 V potential is the lowest limit of stabihty. Below this limit, CdTe corrodes in the whole pH range e.g., for pH < 2.8, H2Te vapor is produced at -1.25 V. For pH > 2.8, diteUuride or telluride ions are formed with disintegration of the compound. (With kind permission from Springer Science+Business Media [82])...

DHN. Apparently DHN both thermally dehyrogenates to naphthalene and disproportionates to Tetralin and naphthalene. In all of the runs, there was a sizable amount of hydrogen released when the reactors were opened. When DHN was heated at 450°C for either 15 or 180 minutes, the ratio of naphthalene to etralin was 1.8. Increased methyl indan formation occurred with time. With the introduction of dibenzyl, the anticipated [2] increased isomerization of T etralin to methyl indan occurred. These results suggest that the rearrangement of hydroaromatics does not proceed through the dihydro-... [Pg.365]

Acceleration/handling Similar to or better than current ICE vehicles Minimal weight (high gravimetric energy density) Rapid hydrogen release kinetic properties... [Pg.329]

Low heat of formation to minimize the energy necessary for hydrogen release and low heat dissipation during the exothermic hydride formation... [Pg.382]

LH2 spills. Liquefied hydrogen releases yield dramatically larger volumes of combustible clouds (1 L of liquid produces 851 L of gas on evaporation). Therefore, the consequences of a fire or explosion are more extensive than that of a pressurized hydrogen release. [Pg.551]

Event tree analysis adapted to accidental hydrogen releases. (From Rigas, F. and Sklavounos, S., lnt. ]. Hydrogen Energ., 30,1501,2005. With permission from International Association of Hydrogen Energy.)... [Pg.553]

Since a catastrophic rupture is rather unlikely, failure modes resulting in large or slow hydrogen release have been identified experimentally. Countermeasures to avoid the preceding failure modes could be for instance... [Pg.562]

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