A simple cell, assembled with commercial parts, suitable for in situ X-ray-absorption spectroscopy measurements of heterogeneous catalysts, has been designed. The cell, light and easy to handle, allows thermal treatments of the sample under investigation up to 823 K in a reducing or oxidizing atmosphere and measurements at both high and liquid-nitrogen temperature. The cell was tested by studying the decomposition, in an oxygen flow, of ammonium metatungstate to WO3. Extended X-ray absorption fine-structure measurements of the ammonium metatungstate before and after a thermal treatment at 773 K are reported.
Cell for the in situ study of heterogeneous catalysts by transmission and fluorescence XAS spectroscopy / Pettiti, Ida; Gazzoli, Delia; M., Inversi; M., Valigi; S., De Rossi; G., Ferraris; P., Porta; S., Colonna. - In: JOURNAL OF SYNCHROTRON RADIATION. - ISSN 0909-0495. - 6:6(1999), pp. 1120-1124. [10.1107/s0909049599010262]
Cell for the in situ study of heterogeneous catalysts by transmission and fluorescence XAS spectroscopy
PETTITI, Ida;GAZZOLI, DELIA;
1999
Abstract
A simple cell, assembled with commercial parts, suitable for in situ X-ray-absorption spectroscopy measurements of heterogeneous catalysts, has been designed. The cell, light and easy to handle, allows thermal treatments of the sample under investigation up to 823 K in a reducing or oxidizing atmosphere and measurements at both high and liquid-nitrogen temperature. The cell was tested by studying the decomposition, in an oxygen flow, of ammonium metatungstate to WO3. Extended X-ray absorption fine-structure measurements of the ammonium metatungstate before and after a thermal treatment at 773 K are reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
