XPS CHARACTERIZATION OF NI AND MO OXIDES BEFORE AND AFTER INSITU TREATMENTS

被引:105
作者
BIANCHI, CL
CATTANIA, MG
VILLA, P
机构
[1] UNIV MILAN, DEPT PHYS CHEM & ELECTROCHEM, I-20133 MILAN, ITALY
[2] CNR, CSRSRC, I-20133 MILAN, ITALY
关键词
D O I
10.1016/0169-4332(93)90429-F
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The characterization of oxide surfaces is often made by means of the XPS technique: in this paper results obtained by treating nickel and molybdenum oxides at a temperature of 523 K, at 10(-4) Pa (in vacuo) and at 10(5) Pa (in hydrogen), are reported. These treatments were performed in a reaction chamber and the samples were subsequently analyzed in the main chamber without exposing them to the atmosphere. The results indicate that it is possible to completely reduce nickel oxide to metal by treating it in hydrogen, while the heating in vacuo leaves a fairly large amount of oxide not reduced on the surface (77.8%, atomic percentage). On the other hand, on the two molybdenum oxides (MoO3 and MoO2) it is possible to notice the presence of a large amount of intermediate not reduced oxides, at 523 K, both in hydrogen and in vacuo.
引用
收藏
页码:211 / 216
页数:6
相关论文
共 32 条
[1]   BULK, SURFACE AND DOUBLE-LAYER PROPERTIES OF ZIRCONIA POLYMORPHS SUBJECTED TO MECHANICAL TREATMENTS [J].
ARDIZZONE, S ;
LAZZARI, P ;
SARTI, M ;
CATTANIA, MG .
MATERIALS CHEMISTRY AND PHYSICS, 1991, 28 (04) :399-412
[2]   LOW-TEMPERATURE INTERACTIONS BETWEEN MOLECULAR-HYDROGEN AND ZIRCONIA - EFFECTS ON THE COMPOSITION, CHARGE AND WETTABILITY OF THE SURFACE [J].
ARDIZZONE, S ;
CATTANIA, MG ;
SARTI, M .
COLLOIDS AND SURFACES, 1992, 68 (1-2) :25-35
[3]   ESCA STUDY OF TERMINATION OF PASSIVATION OF ELEMENTAL METALS [J].
BARR, TL .
JOURNAL OF PHYSICAL CHEMISTRY, 1978, 82 (16) :1801-1810
[4]  
BARR TL, PRACTICAL SURFACE AN, pCH8
[5]   AN XPS STUDY ON RUTHENIUM COMPOUNDS AND CATALYSTS [J].
BIANCHI, CL ;
RAGAINI, V ;
CATTANIA, MG .
MATERIALS CHEMISTRY AND PHYSICS, 1991, 29 (1-4) :297-306
[6]  
Bond G.C., 1962, CATALYSIS METALS
[7]   A STUDY OF RUTHENIUM CATALYSTS ON OXIDE SUPPORTS [J].
CATTANIA, MG ;
PARMIGIANI, F ;
RAGAINI, V .
SURFACE SCIENCE, 1989, 211 (1-3) :1097-1105
[8]  
CATTANIA MG, 1992, VUOTO, V22, P9
[9]   PHOTOELECTRON-SPECTROSCOPY (XPS) AND THERMOGRAVIMETRY (TG) OF PURE AND SUPPORTED RHENIUM OXIDES .1. PURE RHENIUM COMPOUNDS [J].
CIMINO, A ;
DEANGELIS, BA ;
GAZZOLI, D ;
VALIGI, M .
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1980, 460 (01) :86-98
[10]  
EDMONDS T, 1980, CHARACTERIZATION CAT