Catalysis of Hydrocarbon Oxidation with Adsorbed Layers.
Abstract
Further investigations of the effect of Ni(2+) added to H3PO4 electrolytes on the oxidation of C3H8 at Pt electrodes were carried out. Studies were made both with half-cells and complete cells. Measurements on C3H8-O2 fuel cells at 130C were initiated. Generally 9 mg/sq cm Pt electrodes in 85% H3PO4 were used although some minor work in 80% H3PO4 and with 25 mg/sq cm Pt electrodes was also carried out. The results in 85% H3PO4 with 9 mg/sq cm Pt electrodes show no initial effect on cell performance due to the presence of either 20 mM or 200 mM Ni(2+). The self-poisoning characteristics of the anode, however, appear to be improved by the presence of Ni(2+). With 20 mM Ni(2+) in 85% H3PO4 and 25 mg/sq cm Pt electrodes, there is an initial improvement in cell performance of 35% at 0.44 V, 67% at 0.40 V, and 123% at 0.34 V. In 80% H3PO4, there is an initial enhanced cell performance with 20 mM Ni(2+) of 70% at 0.69 V, 52% at 0.59 V, and 10% at 0.49 V. The half-cell measurements with a reversible hydrogen electrode showed little effect due to the presence of Ni(2+). A catalytic effect of the nickel salt of an electrolysis product generated by the DHE is hypothesized to be the cause of the general observation of catalysis. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1971
- Accession Number
- AD0729975
Entities
People
- H. Feng
- M. J. Turner
- S. B. Brummer