Generation of pure hydrogen

Step (a) is a reaction inverse to (he methanol synthesis. If steam is present, the CO is shifted according to step (b). /Vftcr removal of the CO2 in a washing operation, pure hydiogen is the ultimate product. This route of hydrogen production may be advantageous in many situations where no hydrogen from natural gas, coal or crude oil is available. Commerical plants arc already in operation [25]. 

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To conclude, the generation of pure hydrogen from solid biomass is only reasonable if transportation fuel should be produced. But it is not reasonable to produce pure hydrogen from biomass for stationary heat and electricity generation. 

A small commercial unit for generation of pure hydrogen for gas chromatographs and other laboratory uses has been on the market since 1973. 

Generation of pure hydrogen. Methanol in contact with steam can be converted into hydrogen and COj [24j, and the reaction is carried out in two steps (Scheme 5). 

In the early 1990s, production of water gas using steam reforming of methane received tremendous importance if the ultimate objective is generation of pure hydrogen since it provides highest molar ratio of H2/CO of Equation (1.3). 

Cole MJ (1981) The generator of pure hydrogen for industrial applications. Platinum Met Rev 25 12-13... 

Another dehydrogenation of interest can be used to generate very pure hydrogen for hydrogenation reactions and involves the following equiUbrium... 

Thus, although hydrogen is used in methanol production, it can be taken straight from the steam-hydrocarbon reformer and does not require further purification and treatment as in the case of pure hydrogen production or ammonia production. The economics of methanol production are significantly affected by the thermal integration of the reformer (or other gas generation unit) with the rest of the plant. 

Studies indicated that SMR technology was the more economical option than ATR technology for production of pure hydrogen in the size range of interest and was selected for the scale-up hydrogen generator. 

RF Plasma. The activation of the reaction and the generation of atomic hydrogen can also be obtained with an RF plasma (13.56 MHz) but this process is more likely to produce diamond-like carbon (OLC) and not pure diamond (see Ch. 14). 

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