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Do metal-oxide promoters of Cu hydrogenolysis catalysts affect the Cu intrinsic activity?
Authors: Aubrecht Jaroslav | Pospelova Violetta | Kikhtyanin Oleg | Dubnová Lada | Kubicka David
Year: 2020
Type of publication: článek v odborném periodiku
Name of source: Applied catalysis A: General
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: "117889-1"-"117889-10"
Titles:
Language Name Abstract Keywords
cze Podporují kovové oxidy Cu aktivitu jako katalyzátoru pro hydrogenolýzu? Byla studována účinnost modifikovaných Cu katalyzátorů v hydrogenolýze esteru. Modifikace byla provedena pomocí ZnO, ZnO s Al2O3 a MgO. Vliv modifikace na účinnost katalyzátoru a jeho strukturu byl studován metodami AAS, XRD, TPR, BET, N2O-RFC, TGA-MS, NH3-TPD a CO2-TPD. Cu katalyzátor; hydrogenolýza esteru; dimetyl adipát; promoter; Cu aktivita
eng Do metal-oxide promoters of Cu hydrogenolysis catalysts affect the Cu intrinsic activity? The well-established ester hydrogenolysis process has to be further improved to reduce its high energy demand and to replace used Adkins CuCr catalysts by chromium-free alternatives. In this study, the copper-based catalyst was modified by ZnO, ZnO with Al2O3 or MgO to elucidate the metal-oxide influence on catalyst structure, activity, performance and stability in ester hydrogenolysis. The catalysts composition, structure and physico-chemical properties were examined by AAS, XRD, TPR, BET, N2O-RFC, TGA-MS, NH3-TPD and CO2-TPD. It was confirmed that copper itself possesses high intrinsic activity for ester hydrogenolysis but the unpromoted copper species were very unstable. All used metal oxides were proven to be structural promoters stabilizing copper species and increasing the number of active sites. Consequently, they enhanced remarkably catalyst performance in dimethyl adipate conversion despite the decreased intrinsic activity of Cu active sites. All prepared catalysts outperformed a commercial CuCr catalyst in dimethyl adipate hydrogenolysis. Copper catalyst; ester hydrogenolysis; dimethyl adipate; promoter; copper intrinsic activity

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