Methane conversion to light olefins—How does the methyl halide route differ from the methanol to olefins (MTO) route?
| Autor: | Unni Olsbye, Ole Vaaland Saure, Silvia Bordiga, Carlo Lamberti, Merete Hellner Nilsen, Naresh Babu Muddada, Karl Petter Lillerud, Stian Svelle |
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| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Methyl chloride to olefins Reaction mechanism Alkene MeXTO Halide General Chemistry Reaction intermediate Reaction Mechanism Photochemistry Chloride Catalysis Acid catalysis chemistry.chemical_compound chemistry MTO SAPO-34 Spectroscopy medicine Methanol Benzene medicine.drug |
| Zdroj: | Catalysis Today. 171:211-220 |
| ISSN: | 0920-5861 |
| Popis: | The methyl halide to hydrocarbons (MeXTH) reaction represents the second step in a potential two-step route from methane to light olefins or gasoline-range hydrocarbon mixtures. In this contribution, the methyl chloride to olefins reaction (MeXTO) was studied over a H-SAPO-34 catalyst with (Al + P)/Si = 19 by means of catalytic testing at 350–400 °C and WHSV = 11.7 h −1 , infrared spectroscopy and isotopic labelling experiments. Only minor degradation of the H-SAPO-34 material was observed by X-Ray diffraction or infrared spectroscopy after 5 sequential test-regeneration cycles at 400 °C and 550 °C, respectively. Co-feed experiments using 13 C-methyl chloride and 12 C-ethene or 12 C-propene at 400 °C indicated that the conversion level of each compound is directly related to its proton affinity. Furthermore, under the conditions used, no inhibitive effect of the alkenes on methyl chloride conversion was observed. Transient isotopic labelling experiments suggested that hexamethyl benzene is an important reaction intermediate in alkene formation from methyl chloride. However, the isotopic labelling of effluent products during 13 C-methyl chloride– 12 C-alkene co-feed experiments suggested that alkene methylation and interconversion reactions may contribute significantly to C 3 + formation. The findings are in general agreement with similar studies of the methanol to olefins reaction over the same catalyst topology. |
| Databáze: | OpenAIRE |
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