Hydrocarbons, hydrogen storage

The presence of impurities is an important issue in mobile applications where the hydrogen at least initially will be supplied by the decomposition of hydrocarbons or methanol in on-board reformer systems as long as no appropriate hydrogen storage media are available. In such systems CO is an unavoidable by-product, and since CO binds more strongly to Pt than hydrogen, the low operating temperature... 

The comparison of working characteristics (Table 3) of metal-hydrides, hydrocarbons, and fullerenes shows that fullerenes are one of the most promising materials for hydrogen storage. 

Sodium borohydride contains 10.8 wt.% of hydrogen, but it shows unfavorable thermodynamics for use as reversible hydrogen storage material. Over 100 synthesis methods for the preparation of NaBH4 have been described, but only two have reached practical significance. In the Schlesinger process (Eq. (5.7)), trimethyl borate is boiled together with NaH in hydrocarbon oil at 250 °C [19] ... 

Alternative materials for hydrogen storage during long-range transport are, as mentioned in section 2.4.5, methanol and higher hydrocarbons. The... 

Synthetic liquid fuels Renewably produced hydrogen again provides the dominant transport fuel. In this case, however, it is packaged in the form of a synthetic liquid hydrocarbon, such as methanol, to overcome the difficulties of hydrogen storage and distribution. The carbon for fuel synthesis comes from biomass and from the flue gases of carbon-intensive industries. 

The dehydrogenation and hydrogenation of cyclic hydrocarbons are reversible, and the materials are recyclable in hydrogen storage and supply. 

The result is a hydrogen storage material that is less-expensive to produce and delivers hydrogen free of hydrocarbon impurities. 

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