EXAFS STUDY OF HIGHLY ACTIVE Mo2CATALYST

EXAFS Study of Rutile and Anatase

T w o crystallographic forms of TiC>2 (rutile and anatase) were subject to a n extended x r a y absorption fine structure study a t the K threshold of t i tanium. D a t a analysis was carried out b y Fourier methods and curve fitting techniques. Using the theoretical phases, T i 0 bond distances of 1.93(1) A were derived both for ruti le and anatase, as compared to the crystallographic values o...

EXAFS study of Tb-doped silica xerogels.

Francesco Rocca, a• Francesca Monti, b Alexei Kuzmin, c Alberto Dalmaso a'd and Donatella Pasqualini d particular, we are interested in characterising the strong distortion produced during the final process of the xerogels preparation: the long time high temperature treatment, in fact, results in an overall relaxation of the silica network and in the elimination of the wet components, from prec...

Xanes/exafs Study of the Copper Active Site in Methanol Synthesis Catalyst

Highly mixed phases in ball-milled Cu/ZnO catalysts: an EXAFS and XANES study.

New highly mixed phases have been identified in Cu/ZnO systems by EXAFS and XANES at both the Cu and Zn K-edge. The phases were generated by ball-milling Cu(2)O/ZnO mixtures under three different atmospheres of synthetic air (SA), SA + CO(2) and CO(2). The system milled in CO(2) shows disproportionation of Cu(2)O into Cu(0), Cu(1+) (cuprite Cu(2)O-type phase) and Cu(2+) (tenorite CuO-type phase...

EXAFS study of PbS-SnS solid solution.

The local environment of the Pb atom in Pb(x)Sn(1-x)S solid solution was studied by EXAFS technique. The shortest Pb-S bond length in orthorhombic samples was found to be by approximately 0.2 A shorter than in cubic PbS. This indicates that the 6s2 lone pair of Pb is stereochemically active in the SnS host. Strong correlations found in the distribution of metal atoms in the second shell show th...