Methane coupling by membrane reactor. Quarterly report, June 25--September 24, 1996 Page: 4 of 16
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ABSTRACT
To prevent the deep oxidation of methane catalyzed by the direct contact
between methane and the dense membrane material (SrFeCo.503s), BaCeo.6Sm403
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
BaCe0.6Sm0O3-coated membrane which was pretreated with a basic solution before
coating was more evenly covered by the coating material.
The oxygen permeances through the modified membrane tube were measured at
different temperatures. The oxygen permeances 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 C2 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 un-coated area of the dense
membrane surface due to the incomplete coverage of the coating material
(BaCe.6Sme403).
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 BaCe0.6Sm04O3 by the sol-gel technique, and the La/MgO catalyst was
packed inside the membrane tube. The oxygen permeance through the membrane tube
was found to be about ten times higher than that under non-reaction conditions. C2
yields up to 12% were obtained using the coated dense membrane reactor. These yields
are higher than those obtained in an un-coated dense membrane reactor setup with
methane and oxygen co-fed into the tube side, where the same catalyst was packed.1
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Ma, Y.H. Methane coupling by membrane reactor. Quarterly report, June 25--September 24, 1996, report, December 28, 1996; United States. (https://digital.library.unt.edu/ark:/67531/metadc680804/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.