Inhomogeneities and surface structures in oscillatory catalytic kinetics

✍ Scribed by M. Sheintuch; L.M. Pismen

• Book ID: 103005184
• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 874 KB
• Volume: 36
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(81)80137-6

✦ Synopsis

The existence of inhomogeneous surface states is investigated for three oscillatory kinetic models, using realistic values of rate and communication parameters. The analysis shows that local oscillators are effectively synchronized if the autocatalytic variable is a gas-phase concentration. If a surface concentration is lhe autocatalytic variable and the second variable is a gas-phase reactant, the system will admit an inhomogeneous solution in the form of two surface regions separated by a stationary or undulating front. Oscillations may be translated into either a train of trigger waves or into a stationary inhomogeneous state in a system including two surface reactants. The emergence of inhomogeneous surface states leads to falsification of the apparent reaction kinetics, and may induce dependence of the reaction rate on geometrical factors. It may also facilitate formation of permanent surface structures thereby strongly influencing evolution of the c;:alyst under the influence of reaction conditions.