EFFECT OF METAL-SUPPORT REACTION ON CARBURIZATION OF SUPPORTED CATALYSTS .2. PALLADIUM ON SILICA

被引：19

作者：

KEPINSKI, L

WOLCYRZ, M

机构：

[1] Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wrocław

来源：

APPLIED CATALYSIS | 1991年 / 73卷 / 02期

关键词：

CARBURIZATION; CATALYST CHARACTERIZATION (XRD); METAL-SUPPORT REACTION; PALLADIUM SILICA; REGENERATION;

D O I：

10.1016/0166-9834(91)85135-I

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 effect of high-temperature reduction (HTR) in hydrogen on the carburization of palladium in a commercial 5% palladium/silica catalyst was studied by X-ray powder diffraction. It was found that at 970 K an extensive reaction between the palladium and silica occurred with the formation of well-developed, crystalline palladium silicide (most probably Pd4Si). During subsequent annealing in acetylene at 550 K the palladium silicide remained inert, whereas non-reacted palladium formed a supersaturated palladium-carbon solid solution. Regeneration of the HTR palladium/silica catalyst by oxidation (770 K) - reduction (720 K) treatment transformed silicide back into palladium, but without its redispersion. The behavior of the palladium/silica catalyst is compared with that reported earlier for palladium/alumina.

引用

页码：173 / 184

页数：12

共 25 条

[21]

Vogt ETC, 1987, STUD SURF SCI CATAL, V34, P221

[22] REACTION-ENHANCED SINTERING OF PLATINUM THIN-FILMS DURING ETHYLENE OXIDATION [J].

WU, NL ;

PHILLIPS, J .

JOURNAL OF APPLIED PHYSICS, 1986, 59 (03) :769-779

[23] EQUILIBRIUM SILICIDES OF PALLADIUM [J].

WYSOCKI, JA ;

DUWEZ, PE .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1981, 12 (08) :1455-1460

[24]

ZIEMECKI SB, 1985, J CATAL, V95, P621

[25]

[No title captured]

← 1 2 3 →