Demonstration of the Influence of Specific Surface Area on Reaction Rate in Heterogeneous Catalysis
| Autor: | Paweł Stelmachowski, Andrzej Kotarba, Wacław Makowski, Paweł Broś, Paweł Bernard |
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| Rok vydání: | 2021 |
| Předmět: |
Demonstrations
Materials science Heterogeneous catalysis 01 natural sciences Chemical reaction Catalysis Education Reaction rate Demonstration General chemistry Specific surface area High School/Introductory Chemistry First-Year Undergraduate/General biology 010405 organic chemistry 05 social sciences 050301 education Active site General Chemistry Decomposition 0104 chemical sciences Kinetics Chemical engineering biology.protein 0503 education |
| Zdroj: | Journal of Chemical Education |
| ISSN: | 1938-1328 0021-9584 |
| Popis: | Heterogeneous catalysis plays an important role in many chemical reactions, especially those applied in industrial processes, and therefore, its theoretical foundations are introduced not only to students majoring in chemical engineering or catalysis but also as part of general chemistry courses. The consideration of catalytic activity of various solids and mechanisms of catalytic reactions requires the introduction of the concept of an active site, which together with the catalyst specific surface area are discussed as key parameters controlling the reaction rate. There are many known demonstrations of heterogeneous catalysis phenomena that can be performed live in a lecture hall, but all of them focus only on the general idea of catalytic processes and are not suitable for quantitative analysis. Therefore, herein we present a simple demonstration of the influence of the specific surface area of a catalyst on the rate of a catalytic reaction. This demonstration is based on a model reaction of hydrogen peroxide decomposition catalyzed by cobalt spinel (Co3O4) calcined at various temperatures. The differences in reaction rates can be monitored visually, and the obtained data can be used directly for a simple kinetic analysis, including comparison of numerical values of the reaction rate constants. |
| Databáze: | OpenAIRE |
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