Silica grain labelling and EDX spectroscopy; evidence for inter-grain diffusion of Pt(NH3)42+ species during Pt/SiO2 catalyst preparation by ionic exchange

Chemical Communications

Volumn , Issue 15, 2000, Pages 1417-1418

  Goguet, Alexandre ^a   Aouine, Mimoun ^b   Cadete Santos Aires, Francisco J ^b   Schweich, Daniel ^a   Candy, Jean Pierre ^a  

^a CPE LYON   (France)

^b INST DE RECHERCHES SUR LA CATALYSE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

PLATINUM DERIVATIVE; SILICON DIOXIDE; TITANIUM;

ARTICLE; DIFFUSION; ION EXCHANGE; PARTICLE SIZE; ROENTGEN SPECTROSCOPY; TRANSMISSION ELECTRON MICROSCOPY;

EID: 0034617953     PISSN: 13597345     EISSN: None     Source Type: Journal    
DOI: 10.1039/b001955k     Document Type: Article

References (8)

1. M. Che, Proc. 10th Int. Congr. Catal., 19-24 July 1992, Budapest, Hungary, ed. L. Guczi, F. Solymosi and P. Tetenyi, Elsevier Science Publishers, Amsterdam, 1993, p. 31.
2. A. H. Benesis, R. M. Curtis and H. P. Studer, J. Catal., 1968, 10, 328.
3. W. Zou and R. D. Gonzalez, J. Catal., 1992, 133, 202.
4. 2+ ions onto the silica surface was measured by elemental (Pt) analysis of samples of the solution taken at regular time intervals. Elemental analysis was performed with a ICP Jovin Yvo apparatus.
5. 2O at 20 °C. Samples taken after 5 min and 24 h of contact were analyzed.
6. EDX analysis of solid samples: EDX experiments where performed with a Pentafet-LinK ISIS (Oxford Instruments) spectrometer in a JEOL JEM 2010-F TEM (200 kV) equipped with a high resolution pole piece. The samples were dried in an oven at 80 °C before EDX measurement. The probe size was adjusted to the grain size of ca. 10 nm. Only isolated grains were analyzed in order to avoid simultaneous analysis of two different grains.
7. 2O at 20 °C for 1 h. Then 0.5 g of Ti-labelled silica was mixed with 0.5 g of unlabelled impregnated silica and samples corresponding to 5 min and 24 h of contact between the two silica populations were analyzed.
8. 2 prepared in the same manner, using unlabelled and Ti labelled silica exhibit the same Pt loading (1 wt%) and the same metallic particle size distribution. We thus concluded that Ti labelling did not influence the results.