Co-K and Mo-K edges Quick-XAS study of the sulphidation properties of Mo/Al2O3 and CoMo/Al2O3 catalysts

Influence of H 2 O and H 2 S on the composition, activity, and stability of sulfided Mo, CoMo, and NiMo supported on MgAl 2 O 4 for hydrodeoxygenation of ethylene glycol

“…The transition of oxide to sulfide was followed in-situ with XANES and EXAFS (see Figure 9 and Figure 10). Similarly to what has been obtained in literature [89][90][91][92], the oxide precursor underwent transformation into intermediate oxy-sulfide species prior to conversion into the final sulfide form.…”

Selective Catalytic Reduction of NO with NH3 on Cu−SSZ‐13: Deciphering the Low and High‐temperature Rate‐limiting Steps by Transient XAS Experiments

“…However, accurate standard compounds do not exist to describe the Cu‐species present when Cu is interacting directly with the zeolite framework. Recent studies have demonstrated the power of multivariate curve resolution (MCR) methods towards the determination of evolving spectral components in time‐resolved XANES datasets . Multivariate techniques allow for the determination of the pure components within large evolving datasets and as such provide a unique tool for operando spectroscopy.…”

“…Recent studies have demonstrated the power of multivariate curve resolution (MCR) methods towards the determination of evolving spectral components in time-resolved XANES datasets. [10,21,[28][29][30][31][32][33][34][35][36][37][38] Multivariate techniques allow for the determination of the pure components within large evolving datasets and as such provide a unique tool for operando spectroscopy. The underlying principle of MCR methods is to decompose a data matrix D(m x n) of m rows and n columns into matrices of the pure components of the k present species and the time-evolving concentration profiles C(m x k) and S T (k x n) [Eq.…”

Correlation of Sol–Gel Alumina‐Supported Cobalt Catalyst Processing to Cobalt Speciation, Ethanol Steam Reforming Activity, and Stability

“…Except for the only‐dried cobalt impregnated support, for which the speciation of the cobalt species was done by linear combination (LC) of the normalized XANES spectra of cobalt nitrate and hydrotalcite Co II 1− x Al III x (OH) 2 )(NO q −1 x / q ⋅ n H 2 O) phases, the proportion of the different species (Co 3 O 4 , CoAl 2 O 4 , CoO and metallic Co) involved during activation and ESR reactions was determined by a multivariate data analysis, the MCR‐ALS method. Details about the use of the MCR‐ALS method applied to XAS can be found in recent papers and in the Supporting Information . The EXAFS signal extraction and further Fourier transformation of the spectra of pure chemical species determined by MCR‐ALS were done using the Athena graphical Interface software …”