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Title: Atomic-scale cation dynamics in a monolayer VOX/α-Fe2O3 catalyst

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/c5ra18404e· OSTI ID:1370178
ORCiD logo [1];  [2];  [3];  [4];  [5];  [2];  [2]
  1. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Science and Technology of China, Hefei (China)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); Xi'an Modern Chemistry Research Inst., Shaanxi (China)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)

Catalytic reactions are associated with dynamical changes in the catalyst that include the oxidation state and local structural variations. The understanding of such dynamics, particularly at the atomic-scale, is of great importance for revealing the activity and selectivity of the catalyst in numerous reactions. Combining in situ X-ray absorption spectroscopy with in situ diffuse reflectance infrared Fourier transform spectroscopy, we studied the redox-induced dynamical changes for a VOX monolayer catalyst supported on a α-Fe2O3 powder. The results show that several co-existing VOX species reversibly change their V oxidation states between +5 and +4, in concurrence with a structural change from two-dimensional chains to well connected V–O–V networks. These changes are also associated with the breaking and formation of the V ═ O vanadyl group. This combined study provides new insight into how VOX species change during catalytic reactions, which leads to proposed atomic-scale models for the redox-induced dynamics of the catalyst.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Institute for Atom-efficient Chemical Transformations (IACT); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
E. I. duPont de Nemours & Co.; Northwestern University; Dow Chemical Co.; State of Illinois; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; FG02-03ER15457; DMR-1121262
OSTI ID:
1370178
Journal Information:
RSC Advances, Vol. 5, Issue 126; Related Information: IACT partners with Argonne National Laboratory (lead); Brookhaven National Laboratory; Northwestern University; Purdue University; University of Wisconsin at Madison; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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