RARE EARTH OXIDE SENSORS FOR ETHANOL ANALYSIS
作者： Shik Chi Tsang , Colin Bulpitt
DOI: 10.1016/S0925-4005(98)00233-0
关键词: Dehydrogenation 、 PROX 、 Praseodymium 、 Tin oxide 、 Oxygen 、 Electrical resistance and conductance 、 Chemistry 、 Oxide 、 Electrical resistivity and conductivity 、 Inorganic chemistry
摘要: Abstract Rare earth oxides and tin oxide for ethanol analysis in air are investigated using AC impedance DC resistance methods. It is found that the unpromoted rare sensors give a significantly better sensitivity to than Pd/SnO 2 prepared by an incipient wetness method. This attributed their adsorbed oxygen species of strong basicity whereupon oxidative dehydrogenation effectively carried out. interesting note praseodymium shows entirely different sensing mechanism amongst all tested. Lattice non-stoichiometric PrOx involved oxidising at 150–400°C. results destruction electron hopping sites mixed Pr 4+ 3+ lattice leading increase electrical material. The resistivity this new type sensor increases proportion concentration recovers initial value upon removal ethanol.
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