RUTHENIUM DISPERSION AND VALENCE STATE CHANGES IN THE RU GAMMA-AL2O3 FILM CATALYST UNDER HEATING/

Authors
ROMANOVSKAYA VV IVANOVSKAYA MI BRANITSKII GA LYAKHOV AS
Citation
Vv. Romanovskaya et al., RUTHENIUM DISPERSION AND VALENCE STATE CHANGES IN THE RU GAMMA-AL2O3 FILM CATALYST UNDER HEATING/, Kinetics and catalysis, 34(2), 1993, pp. 291-294
Citations number
12
Categorie Soggetti
Chemistry Physical
Journal title
Kinetics and catalysis → ACNP
ISSN journal
00231584
Volume
34
Issue
2
Year of publication
1993
Pages
291 - 294
Database
ISI
SICI code
0023-1584(1993)34:2<291:RDAVSC>2.0.ZU;2-R
Abstract
Differences in ruthenium's valence state and distribution over the sup port in Ru/gamma-Al2O3 and Ru-Al2O3/gamma-Al2O3 catalysts were reveale d by electron microscopy, electron and X-ray diffraction, and XPS meth ods. Preparation of Ru-Al2O3/gamma-Al2O3 film catalysts by thermal dec omposition of aluminum resinate and RuCl3 at the support surface (gamm a-Al2O3) allows one to attain a higher dispersion and a more uniform d istribution of ruthenium, predominantly in the thin subsurface layer o f support granules, than in the Ru/gamma-Al2O3 CatalYSt prepared via s upport impregnation by a RUCl3 SolUtion. Moreover, more complete Ru re duction to the metal state occurs in Ru-Al2O3/gamma-Al2O3 due to metal -support bond weakening.