ELEMENTARY STEPS IN HETEROGENOUS CATALYSIS

被引:169
作者
ERTL, G
机构
[1] Fritz-Haber-Institut Der Max-Planck-Gesellschaft, Berlin, 1000
来源
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH | 1990年 / 29卷 / 11期
关键词
D O I
10.1002/anie.199012191
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Despite the great importance of heterogeneous catalysis, research in this field has long been characterized by its empiricism. Now, however, thanks to the rapid development of methods in surface physics, the elementary steps can be identified at the atomic level and the underlying principles understood. Defined single crystal surfaces are employed as models, based on the analysis of the surfaces of 'real' catalysts. Direct images, with atomic resolution, can be obtained using scanning tunneling microscopy, while electron spectroscopic methods yield detailed information on the bonding state of adsorbed species and the influence of catalyst additives (promotors) upon them. The successful application of this approach is illustrated with reference to the elucidation of the mechanism of ammonia synthesis. The catalyst surface is usually transformed under reaction conditions, and, as the processes involved are far-removed from equilibrium, such transformations can lead to intrinsic spatial and temporal self-organization phenomena. In this case, the reaction rate may not remain constant under otherwise invariant conditions but will change periodically or exhibit chaotic behavior, with the formation of spatial patterns on the catalyst surface.
引用
收藏
页码:1219 / 1227
页数:9
相关论文
共 59 条
[1]   THERMALLY AND KINETICALLY PRODUCED INSTABILITIES IN REACTION BEHAVIOR OF INDIVIDUAL CATALYST GRAINS [J].
BEUSCH, H ;
WICKE, E ;
FIEGUTH, P .
CHEMIE INGENIEUR TECHNIK, 1972, 44 (07) :445-&
[2]   SCANNING TUNNELING MICROSCOPY - FROM BIRTH TO ADOLESCENCE [J].
BINNIG, G ;
ROHRER, H .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1987, 26 (07) :606-614
[3]  
BINNIG G, 1987, ANGEW CHEM, V99, P622
[4]  
BOSCH C, 1910, Patent No. 249447
[5]  
BOSCH C, Patent No. 258146
[6]  
BOSCH C, Patent No. 262823
[7]  
BOSZO F, 1977, J CATAL, V49, P18
[8]  
BOSZO F, 1977, J CATAL, V50, P519
[9]   EXTRAPOLATION OF THE KINETICS OF MODEL AMMONIA-SYNTHESIS CATALYSTS TO INDUSTRIALLY RELEVANT TEMPERATURES AND PRESSURES [J].
BOWKER, M ;
PARKER, IB ;
WAUGH, KC .
APPLIED CATALYSIS, 1985, 14 (1-3) :101-118
[10]   THE APPLICATION OF SURFACE KINETIC DATA TO THE INDUSTRIAL SYNTHESIS OF AMMONIA [J].
BOWKER, M ;
PARKER, I ;
WAUGH, KC .
SURFACE SCIENCE, 1988, 197 (1-2) :L223-L229