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✦   LIBER   ✦

The carbon-carbon dioxide reaction: An extended treatment of the active-site concept

✍ Scribed by Klaus J. Hüttinger; Oliver W. Fritz

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
713 KB
Volume
29
Category
Article
ISSN
0008-6223

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✦ Synopsis

The paper presents results on the kinetics of gasification of a polyvinylchloride coke (heat treated at 1600°C) with carbon dioxide. In addition to the kinetics, temperature-programmed desorption of quenched carbon-oxygen surface complexes was studied. It is shown that the total concentration of active sites, c'!, can be determined by a combined application of Langmuir-Hinshelwood kinetics and the active site theory, whereby the total concentration of carbon-oxygen complexes, CL,, is measured as described above, c" is independent of the carbon dioxide partial pressure, but it decreases exponentially with temperature. With the knowledge of this temperature dependence, the true activation energies of the dissociation, and the desorption step of the gasification reaction can be calculated. The developed active site concept seems now to be completely self-consistent.

Key WordsCarbon

dioxide gasification, kinetics, active sites, temperature programmed desorption.

📜 SIMILAR VOLUMES

Active sites and intrinsic rates of carb
Active sites and intrinsic rates of carbon-gas reactions—a definite confirmation with the carbon-carbon dioxide reaction
✍ Oliver W. Fritz; Klaus J. Hüttinger 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 980 KB

The carbon-carbon dioxide reaction was used as a typical example of carbon-gas reactions for a definite confirmation of the active site concept. This concept is based on the determination of intermediate C(O) surface complexes by temperature-programmed desorption (TPD) of samples. which are quenched