Abstract
The review paper deals with problems of generation of liquid para-hydrogen via the catalytic ortho-para-conversion (OPC) of molecular hydrogen at cryogenic temperatures, with the appropriate catalysts and some problems of the catalyst operation in liquid hydrogen generators. Procedures for estimating the catalyst activity to OPC and calculation of the capacity of liquid hydrogen generators are described. The most important papers are discussed, which concern the application of OPC catalysts for liquid hydrogen generators. A procedure is described for processing of experimental data on the catalyst to be used for calculation of lab-scale and industrial liquid hydrogen generators operating at different temperatures.
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