Surface characterization of Cux/2Cd1−xIn2+x/2S4 model catalysts

✍ Scribed by G. Moretti; A. Anichini; G. Fierro; M. Lo Jacono; P. Porta

• Book ID: 104592645
• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 628 KB
• Volume: 16
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/sia.740160175

✦ Synopsis

Abstract

The sulphospinels reported in the title, with x ranging from 0 to 1.0, were characterized by bulk and surface techniques (XRD, magnetic susceptibility, reflectance spectroscopy and XPS, including x‐ray induced Auger spectroscopy).

Homogeneous spinel solid solutions are formed up to x = 0.4, whereas for the other compositions the CuInS~2~ phase also was indentified by XRD.

Only monovalent copper was found in all the samples, in the bulk as well as on the surface.

The surface of the sulphospinels is stable to air; on the contrary, the surface of CuS is transformed to Cu~2~SO~4~.

Making use of the Wagner Auger parameter and of a simple approximation of the shifts observed in the core electron binding energies, we estimate the charge distribution and the electronic environment of the indium ions in the different sites of the spinel structure.