Quantitative investigations of supported metal catalysts by ASAXS.
Limits and potentiality of anomalous small-angle X-ray scattering for the investigation of supported metal catalysts are discussed. The different sources of statistical errors are illustrated using two catalysts containing metals with absorption edges at very different energies (Au and Pd). Optimized experimental conditions and measuring strategy are proposed, and data-evaluation methods for obtaining quantitative reliable results are suggested. By this method, Au content as low as 0.2 wt% and Pd content of 3 wt% could be investigated with success. The detection limits for palladium are higher, mainly due to its smaller electronic contrast.
Polizzi
Stefano
S
Dipartimento di Chimica Fisica, Università Ca' Foscari di Venezia, Via Torino 155/b, 30170 Venezia-Mestre, Italy. polizzi@unive.it
Riello
Pietro
P
Goerigk
Günter
G
Benedetti
Alvise
A