Kinetic study of SRM over Cu/ZrO2/CeO2 catalystsÂ In the past decade, considerable attention has been focused on the reduction of the significant emissions originating from mobile sources, such as internal combustion engines. Due to its environmental reasons, the proton-exchange membrane fuel cells (PEMFCs) have gained an increasing importance. While compared to conventional heat engines, fuel application has several advantages including higher efficiency and a more convenient operation, the absence of moving parts and low emission of hazardous compounds. Hydrogen combustion in a fuel cell is regarded as a clean reaction because it releases energy and provides only water as an exhaust material. However, hydrogen is not a natural energy source and must be generated by consuming a large amount of energy, either from natural gas or via the electrolysis of water. Furthermore, for a fuel cell vehicle, the storage and the supply of hydrogen, a volatile and explosive gas, imposes mechanical problems and safety hazards on a commercial level
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