Academic Journal
Oxidative Coupling of Methane over Pt/Al$_{2}$O$_{3}$ at High Temperature: Multiscale Modeling of the Catalytic Monolith
| العنوان: | Oxidative Coupling of Methane over Pt/Al$_{2}$O$_{3}$ at High Temperature: Multiscale Modeling of the Catalytic Monolith |
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| المؤلفون: | Chawla, Jaspreet, Schardt, Sven, Angeli, Sofia, Lott, Patrick, Tischer, Steffen, Maier, Lubow, Deutschmann, Olaf |
| المصدر: | Catalysts, 12 (2), Art.-Nr.: 189 ; ISSN: 2073-4344 |
| بيانات النشر: | MDPI |
| سنة النشر: | 2022 |
| المجموعة: | KITopen (Karlsruhe Institute of Technologie) |
| مصطلحات موضوعية: | oxidative coupling methane, kinetic modeling, platinum catalyst, acetylene, ddc:540, Chemistry & allied sciences, info:eu-repo/classification/ddc/540 |
| الوصف: | At high temperatures, the oxidative coupling of methane (OCM) is an attractive approach for catalytic conversion of methane into value-added chemicals. Experiments with a Pt/Al$_{2}$O$_{3}$-coated catalytic honeycomb monolith were conducted with varying CH$_{4}$/O$_{2}$ ratios, N$_{2}$ dilution at atmospheric pressure, and very short contact times. The reactor was modeled by a multiscale approach using a parabolic two-dimensional flow field description in the monolithic channels coupled with a heat balance of the monolithic structure, and multistep surface reaction mechanisms as well as elementary-step, gas phase reaction mechanisms. The contribution of heterogeneous and homogeneous reactions, both of which are important for the optimization of C2 products, is investigated using a combination of experimental and computational methods. The oxidation of methane, which takes place over the platinum catalyst, causes the adiabatic temperature increase required for the generation of CH$_{3}$ radicals in the gas phase, which are essential for the formation of C2 species. Lower CH$_{4}$/O$_{2}$ ratios result in higher C2 selectivity. However, the presence of OH radicals at high temperatures facilitates subsequent conversion of C2H2 at a CH$_{4}$/O$_{2}$ ratio of 1.4. Thereby, C2 species selectivity of 7% was achieved at CH$_{4}$/O$_{2}$ ratio of 1.6, with 35% N$_{2}$ dilution. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/000763718400001; info:eu-repo/semantics/altIdentifier/issn/2073-4344; https://publikationen.bibliothek.kit.edu/1000142840; https://publikationen.bibliothek.kit.edu/1000142840/145156290; https://doi.org/10.5445/IR/1000142840 |
| DOI: | 10.5445/IR/1000142840 |
| الاتاحة: | https://publikationen.bibliothek.kit.edu/1000142840 https://publikationen.bibliothek.kit.edu/1000142840/145156290 https://doi.org/10.5445/IR/1000142840 |
| Rights: | https://creativecommons.org/licenses/by/4.0/deed.de ; info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.78DB5173 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5445/IR/1000142840 |
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