Grünbacher Matthias, Götsch Thomas, Opitz Alexander K, Klötzer Bernhard, Penner Simon
University of Innsbruck, Institute of Physical Chemistry, Innrain 52c, 6020, Innsbruck, Austria.
TU Wien, Institute of Chemical Technologies and Analytics, Getreidemarkt 9/164-EC, 1060, Vienna, Austria.
Chemphyschem. 2018 Jan 5;19(1):93-107. doi: 10.1002/cphc.201700970. Epub 2017 Nov 28.
The activity of the pre-reduced perovskites La Sr FeO (LSF64) and SrTi Fe O (STF73) for the CO reduction to CO was investigated with special focus on the reactivity of oxide-dissolved hydrogen. This is of particular interest in hydrogen solid-oxide electrolysis cell (H-SOEC) technology, where proton-conducting ceramics are used and the reaction 2e +2H +CO →CO+H O is of central importance. To clarify if hydrogen dissolved in LSF64 and STF73 partakes in the CO reduction, temperature-programmed reduction (TPR) in H , followed by temperature-programmed reoxidation (TPO) in CO and, moreover, temperature-programmed desorption (TPD) of ad- and absorbed species were utilized. The experiments reveal that 50 mol % of the CO is converted by hydrogen dissolved in STF73 and reacts quantitatively. On the other hand, LSF64 converts less than 20 mol % of CO via dissolved hydrogen and a residual of bulk OH is still detectable after CO -TPO.
研究了预还原钙钛矿LaSrFeO（LSF64）和SrTiFeO（STF73）将CO还原为CO的活性，特别关注氧化物溶解氢的反应性。这在氢固体氧化物电解池（H-SOEC）技术中尤为重要，在该技术中使用质子传导陶瓷，且反应2e + 2H + CO → CO + H₂O至关重要。为了阐明溶解在LSF64和STF73中的氢是否参与CO还原，采用了在H₂中进行程序升温还原（TPR），随后在CO中进行程序升温再氧化（TPO），此外还进行了吸附和吸收物种的程序升温脱附（TPD）。实验表明，50 mol %的CO被溶解在STF73中的氢转化并定量反应。另一方面，LSF64通过溶解氢转化的CO不到20 mol %，并且在CO-TPO后仍可检测到大量OH的残余物。
