Electrochemical promotion of NO reduction by hydrogen on a platinum/polybenzimidazole catalyst

被引:8
|
作者
Petrushina, IM [1 ]
Bandur, VA [1 ]
Cappeln, F [1 ]
Bjerrum, NJ [1 ]
Sorensen, RZ [1 ]
Refshauge, RH [1 ]
Li, QF [1 ]
机构
[1] Tech Univ Denmark, Dept Chem, Mat Sci Grp, DK-2800 Lyngby, Denmark
关键词
D O I
10.1149/1.1566413
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The electrochemical promotion of catalytic NO reduction by hydrogen was studied using a (NO, H-2, Ar), Pt polybenzimidazole (PBI)-H3PO4\Pt, (H-2, Ar) fuel cell at 135degreesC. A mixture of NO/H-2/Ar was used as the working mixture at one electrode and a mixture of H-2/Ar was used as reference and counter gas at the other electrode. Products of NO reduction (N-2 and H2O) were analyzed by an on-line mass spectrometer. At high NO+H-2+Ar flow rate (17 mL/min; 17 and 354 mL/min, respectively, at atmospheric pressure) the maximum rate enhancement ratio was 4.65. At low NO+H-2+Ar flow rate (17 mL/min; 17 and 140 mL/min, respectively), NO reduction increased 20 times even without polarization compared to the high gas flow rate. The electrochemical promotion effect occurs at positive polarization with a maximum increase at approximately 0.08 V and with 1.5 times the zero polarization value. The promotion at the negative polarization can be attributed to the electrochemical production of the promoters. At low gas flow rates, a charge-induced change of the strength of chemisorptive bonds can take place. (C) 2003 The Electrochemical Society.
引用
收藏
页码:D87 / D90
页数:4
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