Pd Ni / Al2o3 Systems

2001 Words May 12th, 2015 9 Pages
Pd-Ni/Al2O3 systems were investigated in the reaction of hydrogen oxidation in terms of their possible application as catalysts used in passive autocatalytic recombiners (PARs) used in nuclear power plants. Testing experiments, were carried out in a flowing system at different temperatures and humidity of the reaction mixture. The bimetallic catalysts exhibited higher response to the increase of temperature and higher resistance to inhibiting water than the monometallic palladium catalyst. They showed excellent stability during a few tens of hours, similarly, like their monometallic counterpart. Our bimetallic catalysts of hydrogen oxidation can be used as cheaper alternatives to catalysts based on the precious metals in the hydrogen oxidation without loss of their activity over time.
Keywords: palladium, palladium-nickel, catalyst, hydrogen oxidation
INTRODUCTION
The vital component of zircaloy, the construction material of the nuclear reactor equipment, is zirconium. This element is characterized by very low absorption of thermal neutrons and has high corrosion resistance, however at higher temperatures it reacts with water forming hydrogen. Hydrogen causes hydrogen embrittlement of fuel cladding for long lasting exposure and the risk of an explosion during the reactor overheating. Hydrogen oxidation reaction plays a crucial role in safe removing of dangerous hydrogen from the nuclear reactor area, where passive autocatalytic recombiners (PARs) are used.
It is well known…

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