The main process currently applied for the production

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Unformatted text preview: s [10, 11, 16]. The main process currently applied for the production of hydrogen is catalytic steam reforming. Here hydrocarbons are transformed into syngas by the endothermic reaction with steam. This process has been well established and optimised over the decades. Most often nickel catalysts, which combine low costs and high activity are used [17, 18]. Methane as well as other alkanes and naphtha can be used as feedstock. The most important problem of this technology is catalyst deactivation, mainly due to coking. Coking can be minimised by 3 1. Introduction ytrtrghrhrhhrhrhhffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff the choice of the reaction conditions, especially by the use of excess steam and higher reaction temperatures as well as by the choice of the catalyst. Catalysts with high nickel dispersion and basic additives are known to minimise coke formation. Despite all this, the steam reforming process faces several drawbacks, the most significant one being the large energy input needed for the reaction. Consequently the exothermic catalytic partial oxidation has received considerable attention over the last few years. It is thought to be the most economic way to produce hydrogen, cutting the costs by 25% compared to steam reforming [10]. Research concerning the catalytic partial oxidation has been focused on methane, as it is a major feedstock for the production of hydrogen. As in the related steam reforming process the main reason for the catalyst deactivation is coking. Currently the main interest is in coke resistant nickel catalysts. In contrast to methane, only introductory studies concerning the partial oxidation of higher hydrocarbons have been reported in open literature. These studies have been limited to noble metal catalysts [19, 20, 21, 22, 23]. Like in the steam reforming process noble metal catalysts do not seem to be acceptable for this process due to their high cost. The aim of this work is the development of inexpensive, active and stable Ni catalysts for the catalytic partial oxidation of light paraffins using propane as a model subs...
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