EFFECTS OF GAMMA-IRRADIATION AND LITHIUM-OXIDE DOPING ON SURFACE AND CATALYTIC PROPERTIES OF MANGANESE OXIDES SUPPORTED ON ALPHA-ALUMINA

被引：15

作者：

ELSHOBAKY, GA ^{[1
]}

GHOZZA, AM ^{[1
]}

FAGAL, GA ^{[1
]}

SHOUMAN, M ^{[1
]}

机构：

[1] ZAGAZIG UNIV,FAC SCI,DEPT CHEM,ZAGAZIG,EGYPT

来源：

MATERIALS LETTERS | 1994年 / 19卷 / 1-2期

关键词：

D O I：

10.1016/0167-577X(94)90110-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of gamma-irradiation and lithium oxide doping on surface and catalytic properties of manganese oxides loaded on alumina was investigated. The amount of lithium oxide was varied between 0.13 and 1.56 wt% Li2O. The pure and different doped solids were heated in air at 400-1000-degrees-C. The surface properties namely specific surface area (S(BET)), total pore volume (V(p)) and mean pore radius (rBAR) were determined from nitrogen isotherm conducted at 77 K. The catalytic activity of various solids was investigated using the catalysis of CO oxidation reaction by O2 at different temperatures. The results obtained revealed that gamma-irradiation to doses ranged between 20 and 160 Mrad effected no measurable changes in the surface properties. However, this treatment brought about a noticeable decrease in its catalytic activity (44-60%). The increase in lithium oxide content in the range 0.13-1.58 wt% was accompanied by progressive decrease in S(BET) of the various solids.

引用

页码：79 / 86

页数：8

共 24 条

[1] EFFECT OF SUPPORT ON THE SURFACE CHARACTERISTICS OF SUPPORTED MOLYBDENA CATALYSTS
CACERES, CV
FIERRO, JLG
LAZARO, J
AGUDO, AL
SORIA, J
[J]. JOURNAL OF CATALYSIS, 1990, 122 (01) : 113 - 125
[2] SOLID-STATE V-15 NMR STRUCTURAL STUDIES ON SUPPORTED VANADIUM(V) OXIDE CATALYSTS - VANADIUM-OXIDE SURFACE-LAYERS ON ALUMINA AND TITANIA SUPPORTS
ECKERT, H
WACHS, IE
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1989, 93 (18) : 6796 - 6805
[3] ELKHOULY SM, 1991, THESIS AIN SHAMS U
[4] ELSHOBAKY GA, 1982, SURF TECHNOL, V15, P33, DOI 10.1016/0376-4583(82)90082-6
[5] ELSHOBAKY GA, 1987, RADIAT PHYS CHEM, V29, P39
[6] EFFECTS OF GAMMA-RADIATION ON THE SURFACE AND CATALYTIC PROPERTIES OF NIO, CO3O4 AND FE2O3-CR2O3 SOLIDS
ELSHOBAKY, GA
PETRO, NS
GHAZY, TM
DESSOUKI, AM
[J]. SURFACE TECHNOLOGY, 1983, 19 (01): : 17 - 26
[7] EFFECTS OF LITHIUM DOPING ON TEXTURAL CHARACTERISTICS OF CO3O4 CATALYST
ELSHOBAKY, GA
GHAZY, TM
PETRO, NS
[J]. SURFACE TECHNOLOGY, 1982, 15 (03): : 277 - 285
[8] THERMAL-BEHAVIOR OF COBALTIC AND COBALTOUS OXIDES AS INFLUENCED BY DOPING WITH SOME ALKALI-METAL OXIDES
ELSHOBAKY, GA
GHONEIM, NM
MORSI, IM
[J]. THERMOCHIMICA ACTA, 1983, 70 (1-3) : 325 - 337
[9] EFFECTS OF GAMMA-IRRADIATION AND LITHIUM DOPING ON THE CATALYTIC ACTIVITY OF NICKEL ALUMINUM MIXED OXIDES
ELSHOBAKY, GA
ALNOAIMI, AN
DESSOUKI, AM
[J]. SURFACE TECHNOLOGY, 1985, 26 (02): : 117 - 123
[10] THERMAL-DECOMPOSITION OF AMMONIUM META-VANADATE SUPPORTED ON AL2O3
ELSHOBAKY, GA
ELBARAWY, KA
ABDALLA, FHA
[J]. THERMOCHIMICA ACTA, 1985, 96 (01) : 129 - 137

← 1 2 3 →