Methane coupling by membrane reactor. Quarterly report, June 25--September 24, 1996
To prevent the deep oxidation of methane catalyzed by the direct contact between methane and the dense membrane material (SrFeCo{sub 0.5}O{sub 3{minus}x}), BaCe{sub 0.6}Sm{sub 0.4}O{sub 3} perovskite was coated on the inner surface of the dense membrane tube by the sol-gel technique. Different pretreatment methods were tested to compare their effects on the coated film. The morphology of the coated membrane was studied by SEM. The BaCe{sub 0.6}Sm{sub 0.4}O{sub 3}-coated membrane which was pretreated with a basic solution before coating was more evenly covered by the coating material. The oxygen permanence through the modified membrane tube were measured at different temperatures. The oxygen permanence were found to be about 70% lower than those of the unmodified tubes. The catalytic runs were carried out with La/MgO catalyst packed inside the membrane tube. The C{sub 2} yields obtained using the dense membrane reactor were less than 4%. This may have resulted from the fact that the methane fed to the tube side was still exposed to the uncoated area of the dense membrane surface due to the incomplete coverage of the coating material (BaCe{sub 0.6}Sm{sub 0.4}O{sub 3}). A hybrid dense membrane reactor, in which the oxygen was supplied by co-feeding oxygen with methane to the tube side and feeding air to the shell side, was used for the oxidative coupling of methane. Again, the inner surface of the membrane tube was coated with BaCe{sub 0.6}Sm{sub 0.4}O{sub 3} by the sol-gel technique, and the La/MgO catalyst was packed inside the membrane tube. The oxygen permanence through the membrane tube was found to be about ten times higher than that under non-reaction conditions. C{sub 2} yields up to 12% were obtained using the coated dense membrane reactor. These yields are higher than those obtained in an uncoated dense membrane reactor setup with methane and oxygen co-fed into the tube side, where the same catalyst was packed.
- Research Organization:
- Worcester Polytechnic Inst., Dept. of Chemical Engineering, MA (United States)
- Sponsoring Organization:
- USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
- DOE Contract Number:
- AC22-92PC92113
- OSTI ID:
- 292835
- Report Number(s):
- DOE/PC/92113-T17; ON: DE98004125; TRN: AHC2DT08%%16
- Resource Relation:
- Other Information: PBD: 28 Dec 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Methane coupling by membrane reactor. Quarterly technical progress report, September 25--December 24, 1996
Reactor modeling of the oxidative coupling of methane in membranes reactors