High CO2 selectivity in methanol steam reforming through ZnPd/ZnO teamwork
by Matthias Friedrich, Simon Penner, Marc Heggen, and Marc Armbrüster
Methanol steam reforming (MSR) is considered an important building block in the future energy infrastructure to provide clean hydrogen for fuel cell applications. The suppression of CO is the greatest challenge since fuel cell catalysts only tolerate very low CO concentrations. Pd/ZnO catalysts are highly selective towards CO2, however the origin of the high selectivity remained unclear. By combination of aberration-corrected electron microscopy and catalytic studies we have uncovered that the highly CO2-selective state of the ZnPd/ZnO catalyst is due to in situ partial oxidation of the ZnPd nanoparticles which leads to a large amount of interface area between intermetallic ZnPd and small ZnO patches.
Matthias Friedrich, Simon Penner, Marc Heggen, and March Armbrüster: High CO2 selectivity in methanol steam reforming ghrough ZnPd/ZnO teamwork, Angew Chem Int Ed 52 (2013) 4389-4392.