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Title: Structure analysis of supported disordered molybdenum oxides using pair distribution function analysis and automated cluster modelling

Journal Article · · Journal of Applied Crystallography (Online)
 [1];  [1];  [2];  [3];  [4];  [1]; ORCiD logo [1]
  1. Univ. of Copenhagen (Denmark)
  2. Univ. of Copenhagen (Denmark); Danish Technological Inst. (DTI), Taastrup (Denmark)
  3. Danish Technological Inst. (DTI), Taastrup (Denmark)
  4. Technical Univ. of Denmark (DTU), Kongens Lyngby (Denmark)

Molybdenum oxides and sulfides on various low-cost high-surface-area supports are excellent catalysts for several industrially relevant reactions. The surface layer structure of these materials is, however, difficult to characterize due to small and disordered MoOx domains. Here, it is shown how X-ray total scattering can be applied to gain insights into the structure through differential pair distribution function (d-PDF) analysis, where the scattering signal from the support material is subtracted to obtain structural information on the supported structure. MoOx catalysts supported on alumina nanoparticles and on zeolites are investigated, and it is shown that the structure of the hydrated molybdenum oxide layer is closely related to that of disordered and polydisperse polyoxometalates. By analysing the PDFs with a large number of automatically generated cluster structures, which are constructed in an iterative manner from known polyoxometalate clusters, information is derived on the structural motifs in supported MoOx.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1617955
Alternate ID(s):
OSTI ID: 1600832
Journal Information:
Journal of Applied Crystallography (Online), Vol. 53, Issue 1; ISSN 1600-5767
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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