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In situ MAS NMR spectroscopic investigation of the conversion of methanol to olefins on silicoaluminophosphates SAPO-34 and SAPO-18 under continuous flow conditions

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Abstract

Applying in situ 13C MAS NMR spectroscopy under continuous flow (CF) conditions and on-line gas chromatography, the conversion of methanol on silicoaluminophosphates SAPO-34 and SAPO-18 was studied. At reaction temperatures of 573 to 673 K, a strong increase of the yield of propylene and ethylene was observed by on-line gas chromatography. Simultaneously with the occurrence of in situ 13CC CF MAS NMR signals at 126–135 ppm indicates the formation of a mixture of aliphatic and/or cyclic olefins and alkylated aromatics with carbon numbers of C6–C12. All these support the “hydrocarbon pool” mechanism for the formation of light olefins on the SAPO-34 and SAPO-18.

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Authors
  1. Michael Hunger
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  2. Michael Seiler
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  3. Andreas Buchholz
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Hunger, M., Seiler, M. & Buchholz, A. In situ MAS NMR spectroscopic investigation of the conversion of methanol to olefins on silicoaluminophosphates SAPO-34 and SAPO-18 under continuous flow conditions. Catalysis Letters 74, 61–68 (2001). https://doi.org/10.1023/A:1016687014695

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