Reprint of: The role of potassium in the catalytic synthesis of ammonia

被引：0

作者：

Ertl, G. ^{[1
]}

Weiss, M. ^{[1
]}

Lee, S.B. ^{[1
]}

机构：

[1] Institut für Physikalische Chemie der Universität München, Munich W., Germany

来源：

Chemical Physics Letters | 2013年 / 589卷

关键词：

Catalysts - Activation energy - Ammonia - Single crystals;

D O I：

10.1016/j.cplett.2013.08.060

中图分类号：

学科分类号：

摘要：

A model study on the promotor action of K in the synthesis of ammonia on iron catalysts was performed by studying the influence of preadsorbed potassium on the rate of dissociative nitrogen chemisorption (which is the rate-limiting step) on a Fe(100) single crystal surface. It was found that a concentration of 1.5 × 1014 K atoms/cm2 increases this rate by a factor of about 300 at 430 K and removes also the activation energy for this process. This effect is attributed to the increased adsorption energy of molecular N2 (11.5 kcal/mole) which is related with the pronounced transfer of electronic charge from K to the Fe surface. © 2013 Elsevier B.V. All rights reserved.

引用

页码：18 / 20

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