CHARACTERIZATION OF SN DOPED NI/AL2O3 STEAM REFORMING CATALYSTS BY XPS

被引：25

作者：

PADESTE, C ^{[1
]}

TRIMM, DL ^{[1
]}

LAMB, RN ^{[1
]}

机构：

[1] UNIV NEW S WALES,SCH CHEM,KENSINGTON,NSW 2033,AUSTRALIA

来源：

CATALYSIS LETTERS | 1993年 / 17卷 / 3-4期

关键词：

STEAM REFORMING CATALYSTS; SN DOPED NI/AL2O3; SURFACE SEGREGATION OF TIN; XPS OF SN/NI MIXTURES;

D O I：

10.1007/BF00766156

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：

XPS measurements have shown that tin oxides are more readily reduced to metallic tin by hydrogen in Ni/Al2O3 systems than on pure Al2O3. During the reductive activation of Sn doped Ni/Al2O3 catalysts, surface segregation of the dopant was observed. This finding may explain that tin enhances the selectivity of the steam reforming catalysts only when added in very low concentrations and that it acts as a poison at higher loadings.

引用

页码：333 / 339

页数：7

共 17 条

[1] STUDIES IN DIFFERENTIAL CHARGING [J].

BARR, TL .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1989, 7 (03) :1677-1683

[2] XPS INTENSITIES AND BINDING-ENERGY SHIFTS AS METAL DISPERSION PARAMETERS IN NI/SIO2 CATALYSTS [J].

GONZALEZELIPE, AR ;

MUNUERA, G ;

ESPINOS, JP .

SURFACE AND INTERFACE ANALYSIS, 1990, 16 (1-12) :375-379

[3]

HAQUE I, 1990, THESIS U NEW S WALES

[4] EQUILIBRIUM SURFACE SEGREGATION FOR NI-15-PERCENT-CR(110) [J].

JENG, SP ;

HOLLOWAY, PH ;

BATICH, CD .

SURFACE SCIENCE, 1988, 193 (03) :L63-L68

[5] SURFACE SEGREGATION - COMPARISON OF MODELS AND RESULTS [J].

KELLEY, M .

JOURNAL OF CATALYSIS, 1979, 57 (01) :113-125

[6] X-RAY PHOTOELECTRON AUGER ELECTRON SPECTROSCOPIC STUDIES OF TIN AND INDIUM METAL FOILS AND OXIDES [J].

LIN, AWC ;

ARMSTRONG, NR ;

KUWANA, T .

ANALYTICAL CHEMISTRY, 1977, 49 (08) :1228-1235

[7]

MIEDEMA AR, 1978, Z METALLKD, V69, P287

[8] SURFACE COMPOSITION OF BINARY-SYSTEMS - PREDICTION OF SURFACE PHASE-DIAGRAMS OF SOLID-SOLUTIONS [J].

OVERBURY, SH ;

BERTRAND, PA ;

SOMORJAI, GA .

CHEMICAL REVIEWS, 1975, 75 (05) :547-560

[9]

Ridler D. E., 1989, CATALYST HDB, P225

[10] SULFUR-PASSIVATED NICKEL-CATALYSTS FOR CARBON-FREE STEAM REFORMING OF METHANE [J].

ROSTRUPNIELSEN, JR .

JOURNAL OF CATALYSIS, 1984, 85 (01) :31-43

← 1 2 →