TEMPERATURE-PROGRAMMED OXIDATION OF SULFIDED COBALT-MOLYBDATE ALUMINA CATALYSTS

被引：28

作者：

YOSHIMURA, Y

MATSUBAYASHI, N

YOKOKAWA, H

SATO, T

SHIMADA, H

NISHIJIMA, A

机构：

[1] National Chemical Laboratory for Industry, Tsukuba

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 1991年 / 30卷 / 06期

关键词：

D O I：

10.1021/ie00054a004

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Temperature-programmed oxidation of cobalt-molybdate, molybdate, and cobalt catalysts was carried out in thermogravimetric and fixed-bed reactors. During oxidation of the sulfided cobalt-molybdate catalyst in air, the SO2 formation profile exhibited two maxima at about 508 and 708 K, and about 10% of the total sulfur remained after oxidation at 773 K. The SO2 formation profile for sulfided molybdenum and cobalt catalysts indicated that the first SO2 maximum resulted mainly from oxidation of MoS2-like sulfides. EXAFS data of the Mo K edge revealed that some unoxidized MoS2-like sulfides survived after formation of the first SO2 peak. XPS data showed that these unreacted sulfides were covered with oxide/sulfate layers. The formation of the second SO2 maximum, accompanied with an exothermic reaction, might mainly result from oxidation of the unreacted sulfides. The presence of cobalt contributed to an increase in the residual sulfate after oxidation up to 773 K. A thermodynamic investigation supported this result.

引用

页码：1092 / 1099

页数：8

共 30 条

[1] SIMULATED REGENERATION OF AN INDUSTRIAL COMO-GAMMA-AL2O3 CATALYST - INFLUENCE OF THE REGENERATION TEMPERATURE
ARTEAGA, A
FIERRO, JLG
GRANGE, P
DELMON, B
[J]. APPLIED CATALYSIS, 1987, 34 (1-2): : 89 - 107
[2] SIMULATED DEACTIVATION AND REGENERATION OF AN INDUSTRIAL COMO/GAMMA-AL2O3 HYDRODESULFURIZATION CATALYST
ARTEAGA, A
FIERRO, JLG
DELANNAY, F
DELMON, B
[J]. APPLIED CATALYSIS, 1986, 26 (1-2): : 227 - 249
[3] ARTEAGA A, 1987, CATALYST DEACTIVATIO, P59
[4] CO/MO/AL2O3 CATALYST STRUCTURE DETERMINATION BY EXAFS .2. MO K-EDGE OF THE SULFIDED STATE
CHIU, NS
BAUER, SH
JOHNSON, MFL
[J]. JOURNAL OF CATALYSIS, 1986, 98 (01) : 32 - 50
[5] CO/MO/AL2O3 CATALYST STRUCTURE DETERMINATION BY EXAFS .1. MO K-EDGE IN THE OXIDIZED STATE
CHIU, NS
BAUER, SH
JOHNSON, MFL
[J]. JOURNAL OF CATALYSIS, 1984, 89 (02) : 226 - 243
[6] EXTENDED X-RAY ABSORPTION FINE-STRUCTURE STUDY OF CO-MO HYDRODESULFURIZATION CATALYSTS
CLAUSEN, BS
TOPSOE, H
CANDIA, R
VILLADSEN, J
LENGELER, B
ALSNIELSEN, J
CHRISTENSEN, F
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1981, 85 (25) : 3868 - 3872
[7] DOORN JV, 1987, CATALYST DEACTIVATIO, P391
[8] FARRAGHER AL, 1973, 5TH CAT P INT C, V2, P1301
[9] MECHANISM OF OXIDATIVE REGENERATION OF MOLYBDATE CATALYST
FURIMSKY, E
YOSHIMURA, Y
[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1987, 26 (04) : 657 - 662
[10] FURIMSKY E, 1989, HDB HEAT MASS TRANSF, V3, P229

← 1 2 3 →