Issue 21, 2010
From the journal:

Physical Chemistry Chemical Physics

Wavelet transform EXAFS analysis of mono- and dimolybdate model compounds and a Mo/HZSM-5 dehydroaromatization catalyst†

Robert O. Savinellia  and  Susannah L. Scott*ab  

* Corresponding authors

a Department of Chemistry & Biochemistry, University of California, Santa Barbara

b Department of Chemical Engineering, University of California, Santa Barbara
E-mail: sscott@engineering.ucsb.edu
Fax: 1-805-893-4731

Abstract

The local structure of molybdate ions in the crystalline materials MgMoO4 and MgMo2O7 and in Mo/HZSM-5 (2 wt% Mo, Si/Al = 15) was explored by EXAFS at the Mo K-edge, using both Fourier and wavelet transforms. For the two model compounds, curve fitting analysis of the FT-EXAFS reveals the need to include several single- and multiple-scattering paths in order to locate the Mo–Mo paths accurately. Some of these overlapping paths can be identified using WT-EXAFS analysis. Indeed, the positions of WT maxima can be predicted fairly accurately, allowing for qualitative identification of the paths required for curve fitting in samples of unknown structure and providing additional criteria for distinguishing statistically similar curve fits. The application of the WT analysis technique to the heterogeneous catalyst Mo/HZSM-5 clearly shows the presence of dimolybdate ions, although with structures perturbed by their interactions with the zeolite framework.

Graphical abstract: Wavelet transform EXAFS analysis of mono- and dimolybdate model compounds and a Mo/HZSM-5 dehydroaromatization catalyst

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Article information

DOI
https://doi.org/10.1039/B926474D
Article type
Paper
Submitted
15 Dec 2009
Accepted
15 Apr 2010
First published
29 Apr 2010

Phys. Chem. Chem. Phys., 2010,12, 5660-5667

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Wavelet transform EXAFS analysis of mono- and dimolybdate model compounds and a Mo/HZSM-5 dehydroaromatization catalyst

R. O. Savinelli and S. L. Scott, Phys. Chem. Chem. Phys., 2010, 12, 5660 DOI: 10.1039/B926474D

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