期刊
CATALYSTS
卷 7, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/catal7110348
关键词
formic acid; dehydrogenation; dehydration; ruthenium; carbon monoxide; preferential oxidation; PROX
资金
- Ecole Polytechnique Federale de Lausanne (EPFL)
- Swiss Competence Center for Energy Research (SCCER)
- Swiss Commission for Technology and Innovation (CTI)
- Swiss National Science Foundation (SNSF)
Formic acid (FA) is considered as a potential durable energy carrier. It contains similar to 4.4 wt % of hydrogen (or 53 g/L) which can be catalytically released and converted to electricity using a proton exchange membrane (PEM) fuel cell. Although various catalysts have been reported to be very selective towards FA dehydrogenation (resulting in H-2 and CO2), a side-production of CO and H2O (FA dehydration) should also be considered, because most PEM hydrogen fuel cells are poisoned by CO. In this research, a highly active aqueous catalytic system containing Ru(III) chloride and meta-trisulfonated triphenylphosphine (mTPPTS) as a ligand was applied for FA dehydrogenation in a continuous mode. CO concentration (8-70 ppm) in the resulting H-2 + CO2 gas stream was measured using a wide range of reactor operating conditions. The CO concentration was found to be independent on the reactor temperature but increased with increasing FA feed. It was concluded that unwanted CO concentration in the H-2 + CO2 gas stream was dependent on the current FA concentration in the reactor which was in turn dependent on the reaction design. Next, preferential oxidation (PROX) on a Pt/Al2O3 catalyst was applied to remove CO traces from the H-2 + CO2 stream. It was demonstrated that CO concentration in the stream could be reduced to a level tolerable for PEM fuel cells (similar to 3 ppm).
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