Non-oxidative dehydroaromatization of methane:an effective reaction regeneration cyclic operation for catalyst life extension
| Autor: | M. Teresa Portilla, Cristina Martínez, Francisco J. Llopis |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Inorganic chemistry
Aromatization Deactivation Catalyst life extension Non oxidative Highly selective 7. Clean energy Electron Microscopy Service of the UPV Catalysis Methane chemistry.chemical_compound chemistry Zeolites Methane aromatization Benzene Zeolite Selectivity Reaction-regeneration cycles Mo/zeolites |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| Popis: | [EN] Non-oxidative methane aromatization is an attractive direct route for producing higher hydrocarbons. It is highly selective to benzene despite the low conversion due to thermodynamic limitations, and Mo/H-ZSM-5, the first catalyst proposed for this reaction, is still considered as one of the most adequate. The major problem of this process is the severe catalyst deactivation due to the rapid build-up of carbonaceous deposits on the catalysts. Here we present an effective regeneration procedure that extends the life of Mo/zeolite based catalysts by combining reaction periods of 1.5 h with 0.5 h regeneration steps in a continuous cyclic mode and methane activation after each regeneration stage. Benzene productivity obtained with Mo/ZSM-5 is shown to be almost constant for increasing TOS ranges when applying this new cyclic protocol, and threefold values are achieved for an 18 h on stream period by limiting the reaction steps to the first 1.5 h of maximum benzene selectivity (97 vs. 33 g benzene per kg cat h) compared to a conventional single run. Funding from the European Community's 7th Framework Program through the Collaborative Project Next-GTL (agreement n° 229183) and financial support by the Spanish GovernmentMINECO through “Severo Ochoa” (SEV 2012-0267), Consolider Ingenio 2010-Multicat, MAT2012-37160 and MAT2012-31657 are acknowledged. The authors thank B. Esparcia for technical assistance and the Electron Microscopy Service of the UPV for their help in sample characterization. |
| Databáze: | OpenAIRE |
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