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Highly active iridium catalyst for hydrogen production from formic acid
Ist Teil von
Chinese chemical letters, 2017-08, Vol.28 (8), p.1746-1750
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2017
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Formic acid(FA) dehydrogenation has attracted a lot of attentions since it is a convenient method for H_2 production. In this work, we designed a self-supporting fuel cell system, in which H_2 from FA is supplied into the fuel cell, and the exhaust heat from the fuel cell supported the FA dehydrogenation. In order to realize the system, we synthesized a highly active and selective homogeneous catalyst Ir Cp*Cl_2 bpym for FA dehydrogenation. The turnover frequency(TOF) of the catalyst for FA dehydrogenation is as high as7150 h~(-1)at 50°C, and is up to 144,000 h~(-1)at 90°C. The catalyst also shows excellent catalytic stability for FA dehydrogenation after several cycles of test. The conversion ratio of FA can achieve 93.2%, and no carbon monoxide is detected in the evolved gas. Therefore, the evolved gas could be applied in the proton exchange membrane fuel cell(PEMFC) directly. This is a potential technology for hydrogen storage and generation. The power density of the PEMFC driven by the evolved gas could approximate to that using pure hydrogen.