In situ formation of ZnOxspecies for efficient propane dehydrogenation
In: Nature, Jg. 599 (2021-11-11), Heft 7884, S. 234-238
Online
serialPeriodical
Zugriff:
Propane dehydrogenation (PDH) to propene is an important alternative to oil-based cracking processes, to produce this industrially important platform chemical1,2. The commercial PDH technologies utilizing Cr-containing (refs. 3,4) or Pt-containing (refs. 5–8) catalysts suffer from the toxicity of Cr(vi) compounds or the need to use ecologically harmful chlorine for catalyst regeneration9. Here, we introduce a method for preparation of environmentally compatible supported catalysts based on commercial ZnO. This metal oxide and a support (zeolite or common metal oxide) are used as a physical mixture or in the form of two layers with ZnO as the upstream layer. Supported ZnOxspecies are in situ formed through a reaction of support OH groups with Zn atoms generated from ZnO upon reductive treatment above 550 °C. Using different complementary characterization methods, we identify the decisive role of defective OH groups for the formation of active ZnOxspecies. For benchmarking purposes, the developed ZnO–silicalite-1 and an analogue of commercial K–CrOx/Al2O3were tested in the same setup under industrially relevant conditions at close propane conversion over about 400 h on propane stream. The developed catalyst reveals about three times higher propene productivity at similar propene selectivity.
Titel: |
In situ formation of ZnOxspecies for efficient propane dehydrogenation
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Autor/in / Beteiligte Person: | Zhao, Dan ; Tian, Xinxin ; Doronkin, Dmitry E. ; Han, Shanlei ; Kondratenko, Vita A. ; Grunwaldt, Jan-Dierk ; Perechodjuk, Anna ; Vuong, Thanh Huyen ; Rabeah, Jabor ; Eckelt, Reinhard ; Rodemerck, Uwe ; Linke, David ; Jiang, Guiyuan ; Jiao, Haijun ; Kondratenko, Evgenii V. |
Link: | |
Zeitschrift: | Nature, Jg. 599 (2021-11-11), Heft 7884, S. 234-238 |
Veröffentlichung: | 2021 |
Medientyp: | serialPeriodical |
ISSN: | 0028-0836 (print) ; 1476-4687 (print) |
DOI: | 10.1038/s41586-021-03923-3 |
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