CRYSTALLITE SHAPE AND IRON LATTICE ORIENTATION IN THE AMMONIA-SYNTHESIS CATALYST

被引：12
|
作者：
HOLME, B
TAFTO, J
机构：
[1] Department of Physics, University of Oslo, N-0316 Oslo
来源：
JOURNAL OF CATALYSIS | 1995年 / 152卷 / 02期
关键词：
D O I：
10.1006/jcat.1995.1079
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 morphology of reduced and stabilized ammonia synthesis catalyst, which is produced by reduction of magnetite, has been studied using optical microscopy with polarized light and transmission electron microscopy. The combined use of these techniques has revealed micrometer size regions of different pore structure within the reduced magnetite grains. One of these structures consisting of parallel sheets of bcc-iron is described. Both the sheets and the space between them are of typical thickness, 15 nn. The orientation of iron in the sheets is related to the former magnetite crystal lattice by a rotation of 45 degrees about one of the three (100) axes. This (100) axis, common to both magnetite and iron, is normal to the iron sheets. The sheet-like iron regions display large scale magnetic domains with in-plane magnetization within the sheets. (C) 1995 Academic Press, Inc.
引用
收藏
页码：243 / 251
页数：9
相关论文
共 50 条
  • [1] Crystallite Shape and Iron Lattice Orientation in the Ammonia Synthesis Catalyst
    1600, (162):
  • [2] NEW AMMONIA-SYNTHESIS CATALYST WITH NO IRON
    MENON, PG
    APPLIED CATALYSIS A-GENERAL, 1993, 93 (02) : N16 - N16
  • [3] KINETICS OF AMMONIA-SYNTHESIS ON AN IRON CATALYST
    ANOKHIN, VN
    MENSHOV, VN
    ZUEV, AA
    JOURNAL OF APPLIED CHEMISTRY OF THE USSR, 1975, 48 (03): : 509 - 511
  • [4] KINETICS OF REDUCTION OF AN IRON CATALYST FOR AMMONIA-SYNTHESIS
    BARANSKI, A
    LAGAN, JM
    PATTEK, A
    REIZER, A
    REACTION KINETICS AND CATALYSIS LETTERS, 1980, 15 (02): : 285 - 291
  • [5] THE TOPOCHEMISTRY OF THE REDUCTION OF AN IRON CATALYST FOR AMMONIA-SYNTHESIS
    REIZER, A
    BARANSKI, A
    APPLIED CATALYSIS, 1984, 9 (03): : 343 - 350
  • [6] STUDIES ON THE REDUCTION OF AN IRON CATALYST FOR AMMONIA-SYNTHESIS .2. MOSSBAUER STUDIES ON THE REDUCTION OF AN IRON AMMONIA-SYNTHESIS CATALYST AT DIFFERENT TEMPERATURES
    PATTEKJANCZYK, A
    HRYNKIEWICZ, AZ
    KRACZKA, J
    KULGAWCZUK, D
    APPLIED CATALYSIS, 1983, 6 (01): : 35 - 40
  • [7] CHARACTERIZATION OF UNREDUCED FUSED IRON CATALYST FOR AMMONIA-SYNTHESIS
    PATTEKJANCZYK, A
    BARANSKI, A
    KOTARBA, A
    KOWALSKA, A
    MICZKO, B
    PYRCZAK, E
    REIZER, A
    REUBENBAUER, K
    SEPIOL, B
    SPIEWAK, Z
    APPLIED CATALYSIS, 1988, 39 (1-2): : 169 - 183
  • [8] MODEL OF ACTIVE SURFACE OF IRON CATALYST FOR AMMONIA-SYNTHESIS
    ARABCZYK, W
    NARKIEWICZ, U
    KALUCKI, K
    VACUUM, 1994, 45 (2-3) : 267 - 269
  • [9] MICROSTRUCTURE OF THE IRON-COBALT CATALYST OF AMMONIA-SYNTHESIS
    KALISTRATOVA, EN
    RABINA, PD
    KOMAROV, VS
    KUZNETSOV, LD
    ROZIN, AT
    CHUDINOV, MG
    INORGANIC MATERIALS, 1989, 25 (07) : 987 - 989
  • [10] THE EFFECT OF WATER ON THE REDUCTION OF AN IRON CATALYST FOR AMMONIA-SYNTHESIS
    BARANSKI, A
    LAGAN, JM
    PATTEK, A
    REIZER, A
    APPLIED CATALYSIS, 1982, 3 (03): : 201 - 206
12345