PdCu nanoalloy supported on alumina: A stable and selective catalyst for the conversion of bioethanol to linear a-alcohols

Nikolaev, S.A.; Tsodikov, M.V.; Chistyakov, A.V.; Chistyakova, P.A.; Ezzhelenko, D.I.; Shilina, M.I.

Авторы: Nikolaev S.A., Tsodikov M.V., Chistyakov A.V., Chistyakova P.A., Ezzhelenko D.I., Shilina M.I.
Журнал: Catalysis Today
Год издания: 2020
Издательство: Elsevier BV
Местоположение издательства: Netherlands
DOI: 10.1016/j.cattod.2020.06.061
Аннотация: PdCu/Al2O3 (Pd = 0.1 wt.%, Cu = 0.1 wt.%) catalyst and its monometallic analogues (Pd/Al2O3 and Cu/Al2O3) were prepared by combination of deposition-precipitation and impregnation methods. The structure of the catalysts was studied by means of XRD, TEM, EDS, TPD-NH3, and DRIFTS. In a standard run (275 ○C, 5 h), Cu/Al2O3 converts 11% of ethanol to a-alcohols with 0.6% selectivity, whereas Pd/Al2O3 converts 24% of ethanol to a-alcohols with 70% selectivity. The high performance of Pd/Al2O3 was attributed to the catalysis on the Pd0-Al2O3 interfaces. After 3 sequential runs, the activity of Pd/Al2O3 decreases by 98%. It was explained by blocking of Pd0 sites in Pd/Al2O3 by CO molecules produced in side reactions. Modification of Pd/Al2O3 with Cu species results in the formation of PdCu/Al2O3 catalyst containing PdCu alloy particles with the size of 4 nm. This leads to an increased durability of bimetallic sample, because of suppressing CO sorption on Pd0 sites in alloy particles. As a result, for the PdCu/Al2O3 catalyst, sustained and high conversion (41%) accompanied by high selectivity to a-alcohols (91%) was observed in 20 sequential runs.
Добавил в систему: Николаев Сергей Александрович

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PdCu nanoalloy supported on alumina: A stable and selective catalyst for the conversion of bioethanol to linear a-alcoholsстатья Исследовательская статья

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