Direct partial oxidation of methane over ZSM-5 catalyst: effects of additives |
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Authors: | S. Han R. E. Palermo J. A. Pearson D. E. Walsh |
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Affiliation: | (1) Present address: Department of Physical Chemistry, Hoffman-LaRoche, 340 Kingsland St., 07110 Nutley, NJ, USA;(2) Mobil Research & Development Corporation, Central Research Laboratory, PO Box 1025, 08543-1025 Princeton, NJ, USA |
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Abstract: | Previously, it was reported that the direct partial oxidation (DPO) of CH4 with O2 over HZSM-5 catalysts produces C5+ hydrocarbon liquids when the feed contains a propane or propene additive. This work studies additive effects on C5+ production in this system by processing a CH4/C3H8 feed with subsequent removal of the C3 additive and by processing natural gas feed. Results show C5+ production is maintained at constant yields for HZSM-5 catalysts having different zeolitic Al contents after removal of the C3 additive. Mechanistic implications are discussed. Natural gas DPO consistently produced C5+ liquids due to the presence of C2+ components in the feed. While C5+ yields from natural gas DPO are higher than those observed for CH4/C3 feeds, increasing feed O2 concentration, and thus conversion, deleteriously affected C5+ selectivity. |
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Keywords: | Methane partial oxidation additive natural gas ZSM-5 |
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