[Zurück]

K. Dobrezberger, J. Stropp, J. Neuhauser, A. Aspalter, M. Huber, K. Föttinger, G. Rupprechter:
"Pd and Cu monometallic and bimetallic nanoparticles supported on ZnO for CO2 hydrogenation: Catalysis and characterization";
Vortrag: 18. Österreichische Chemietage, Linz; 24.09.2019 - 27.09.2019; in: "Chemietage 2019 "Book of Abstracts"", (2019), 1 S.

In this work, ZnO supported Cu and Pd nanoparticle catalysts are used for CO2 hydrogenation and the dependence on parameters such as temperature, pressure and reduction temperature were analyzed. Palladium is more active than copper and forms a PdZn phase at higher reaction temperatures. Alloying cannot be observed with copper and zinc. HR-TEM, STEM-HAADF, EDX and XRD were carried out for characterization. The long-term stability was also investigated, and it was concluded that all catalysts have relatively good stability with time. At atmospheric pressure mainly CO was formed, whereas at a pressure of 20 bar also methane and traces of methanol were produced. The formation of PdZn alloys, which form in Pd/ZnO catalysts, also plays a role in the catalytic activity [1], [2]. It was found that at atmospheric pressure the palladium catalysts have a much higher catalytic activity than the copper nanoparticles. Interestingly, the bimetallic PdCu/ZnO catalysts are catalytically more active at 20 bar pressure than the monometallic Cu and Pd nanoparticles. Furthermore, Pd and Cu nanoparticles were also tested using graphene as support. Interestingly, even with these catalysts, there is an activity for CO2 hydrogenation, although there is no oxide support.