Heterogeneous reactions over fractal surfaces: A multifractal scaling analysis

✍ Scribed by Shyi-Long Lee; Chung-Kung Lee

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 325 KB
• Volume: 64
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/(sici)1097-461x(1997)64:3<337::aid-qua6>3.0.co;2-x

✦ Synopsis

Ž .

Monte Carlo simulations of Eley᎐Rideal ER mechanisms with fixed and varying Ž . sticking probabilities, p, as well as a three-step catalytic reaction TCR over fractal surfaces were performed to examine the morphological effect on the above-mentioned reactions. The effect of decay and enhancing profiles on the reaction probability Ž . distribution RPD for the ER reaction as well as effects of a varying probability of Ž . reaction steps on the normalized selectivity distribution NSD for the three-step reaction were then analyzed by multifractal scaling techniques. For ER with a fixed sticking probability, a small p value tends to yield homogeneous RPD. For ER with a varying sticking probability, the RPD is revealed to be spatially uniform at fast decay and rather concentrated at a faster enhancing rate. For the three-step reaction, a large dimerizationrisomerization ratio increases the position distinction among active sites as the adsorption probability equals 1. At a small adsorption probability, the dimerizationrisomerization ratio causes no effect on the NSD. Heterogeneity of surfaces as reflected in the multifractal analysis will also be discussed.