%0 Journal Article
%A Amann, Peter
%A Klötzer, Bernhard
%A Degerman, David
%A Köpfle, Norbert
%A Goetsch, Thomas
%A Lömker, Patrick
%A Rameshan, Christoph
%A Ploner, Kevin
%A Bikaljevic, Djuro
%A Wang, Hsin-Yi
%A Soldemo, Markus
%A Shipilin, Mikhail
%A Goodwin, Christopher M.
%A Gladh, Jörgen
%A Halldin Stenlid, Joakim
%A Börner, Mia
%A Schlueter, Christoph
%A Nilsson, Anders
%T The state of zinc in methanol synthesis over a Zn/ZnO/Cu(211) model catalyst
%J Science
%V 376
%N 6593
%@ 0036-8075
%C Cambridge, Mass.
%I Moses King
%M PUBDB-2022-03204
%P 603 - 608
%D 2022
%Z Waiting for fulltext
%X The active chemical state of zinc (Zn) in a zinc-copper (Zn-Cu) catalyst during carbon dioxide/carbon monoxide (CO<sub>2</sub>/CO) hydrogenation has been debated to be Zn oxide (ZnO) nanoparticles, metallic Zn, or a Zn-Cu surface alloy. We used x-ray photoelectron spectroscopy at 180 to 500 millibar to probe the nature of Zn and reaction intermediates during CO<sub>2</sub>/CO hydrogenation over Zn/ZnO/Cu(211), where the temperature is sufficiently high for the reaction to rapidly turn over, thus creating an almost adsorbate-free surface. Tuning of the grazing incidence angle makes it possible to achieve either surface or bulk sensitivity. Hydrogenation of CO<sub>2</sub> gives preference to ZnO in the form of clusters or nanoparticles, whereas in pure CO a surface Zn-Cu alloy becomes more prominent. The results reveal a specific role of CO in the formation of the Zn-Cu surface alloy as an active phase that facilitates efficient CO<sub>2</sub> methanol synthesis.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:35511988
%U <Go to ISI:>//WOS:000796932700038
%R 10.1126/science.abj7747
%U https://bib-pubdb1.desy.de/record/479771