In situ formation of ZnOx species for efficient propane dehydrogenation

Autor: Evgenii V. Kondratenko, Dan Zhao, Uwe Rodemerck, Anna Perechodjuk, Dmitry E. Doronkin, Reinhard Eckelt, Jan-Dierk Grunwaldt, Thanh Huyen Vuong, Vita A. Kondratenko, Shanlei Han, Haijun Jiao, Xinxin Tian, Jabor Rabeah, David Linke, Guiyuan Jiang
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Nature
Nature , 599, 234–238
Nature 599(7884), 234-238 (2021). doi:10.1038/s41586-021-03923-3
ISSN: 1476-4687
0028-0836
DOI: 10.1038/s41586-021-03923-3
Popis: Nature 599(7884), 234 - 238 (2021). doi:10.1038/s41586-021-03923-3
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. 5,6,7,8) 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 ZnO$_x$ species 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 ZnO$_x$ species. For benchmarking purposes, the developed ZnO���silicalite-1 and an analogue of commercial K���CrO$_x$/Al$_2$O$_3$ were 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.
Published by Nature Publ. Group, London [u.a.]
Databáze: OpenAIRE
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