Dalebout, Remco;
Barberis, Laura;
Visser, Nienke L.;
van der Hoeven, Jessi E. S.;
van der Eerden, Ad M. J.;
Stewart, Joseph A.;
Meirer, Florian;
de Jong, Krijn P.;
de Jongh, Petra E.
Manganese Oxide as a Promoter for Copper Catalysts in CO2 and CO Hydrogenation
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Medientyp:
E-Artikel
Titel:
Manganese Oxide as a Promoter for Copper Catalysts in CO2 and CO Hydrogenation
Beteiligte:
Dalebout, Remco;
Barberis, Laura;
Visser, Nienke L.;
van der Hoeven, Jessi E. S.;
van der Eerden, Ad M. J.;
Stewart, Joseph A.;
Meirer, Florian;
de Jong, Krijn P.;
de Jongh, Petra E.
Beschreibung:
<jats:title>Abstract</jats:title><jats:p>In this work, we discuss the role of manganese oxide as a promoter in Cu catalysts supported on graphitic carbon during hydrogenation of CO<jats:sub>2</jats:sub> and CO. MnO<jats:sub>x</jats:sub> is a selectivity modifier in an H<jats:sub>2</jats:sub>/CO<jats:sub>2</jats:sub> feed and is a highly effective activity promoter in an H<jats:sub>2</jats:sub>/CO feed. Interestingly, the presence of MnO<jats:sub>x</jats:sub> suppresses the methanol formation from CO<jats:sub>2</jats:sub> (TOF of 0.7 ⋅ 10<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup> at 533 K and 40 bar) and enhances the low‐temperature reverse water‐gas shift reaction (TOF of 5.7 ⋅ 10<jats:sup>−3</jats:sup> s<jats:sup>−1</jats:sup>) with a selectivity to CO of 87 %<jats:sub>C</jats:sub>. Using time‐resolved XAS at high temperatures and pressures, we find significant absorption of CO<jats:sub>2</jats:sub> to the MnO, which is reversed if CO<jats:sub>2</jats:sub> is removed from the feed. This work reveals fundamental differences in the promoting effect of MnO<jats:sub>x</jats:sub> and ZnO<jats:sub>x</jats:sub> and contributes to a better understanding of the role of reducible oxide promoters in Cu‐based hydrogenation catalysts.</jats:p>