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Title: Catalytic properties of oxygen semipermeable perovskite-type ceramic membrane materials for oxidative coupling of methane

Abstract

The catalytic properties for the oxidative coupling of methane (OCM) of La{sub 0.8}Sr{sub 0.2}CoO{sub 3} (LSC) and SrCo{sub 0.8}Fe{sub 0.2}O{sub 3}(SCF) in solid solution were studied and compared with those of 5 wt% Li/MgO, using a steady/unsteady state packed-bed reactor and a transient microbalance. The results of the steady-state cofeed experiments show that LSC possesses OCM catalytic properties similar to those of Li/MgO in terms of C{sub 2} yield and selectivity at temperatures of around 800 C. The former gives a larger C{sub 2} space time yield than the latter. SCF exhibits poor OCM catalytic properties at 700-850{degrees}C. To further examine the suitability of LSC as a membrane material for use in a dense membrane reactor for OCM, the instant OCM selectivity and activity and oxygen consumption rate for LSC and 5% Li/MgO on exposure to pure methane in cyclic feed mode were measured respectively at 850{degrees}C and 800{degrees}C. For both materials, the unsteady-state cyclic feed operation gives a smaller initial OCM activity and larger initial C{sub 2} selectivity than the cofeed steady state operation. Li/MgO quickly loses its OCM activity and selectivity in the unsteady state operation due to rapid consumption of the active sites. Up to 5 minmore » of methane run time, LSC maintains appreciable OCM activity with poorer C{sub 2} selectivity as compared to the steady state cofeed operation. The surface of LSC membrane at low oxygen partial pressure may become nonselective for OCM in membrane reactor applications. 48 refs., 12 figs., 4 tabs.« less

Authors:
;  [1]
  1. Univ. of Cincinnati, OH (United States)
Publication Date:
OSTI Identifier:
486390
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 164; Journal Issue: 1; Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; 40 CHEMISTRY; METHANE; OXIDATION; CHEMICAL REACTIONS; LANTHANUM OXIDES; CATALYTIC EFFECTS; STRONTIUM OXIDES; COBALT OXIDES; IRON OXIDES; CHEMICAL REACTION YIELD; CERAMICS; MEMBRANES; SOLID SOLUTIONS; HETEROGENEOUS CATALYSIS

Citation Formats

Lin, Y S, and Zeng, Y. Catalytic properties of oxygen semipermeable perovskite-type ceramic membrane materials for oxidative coupling of methane. United States: N. p., 1996. Web. doi:10.1006/jcat.1996.0377.
Lin, Y S, & Zeng, Y. Catalytic properties of oxygen semipermeable perovskite-type ceramic membrane materials for oxidative coupling of methane. United States. https://doi.org/10.1006/jcat.1996.0377
Lin, Y S, and Zeng, Y. 1996. "Catalytic properties of oxygen semipermeable perovskite-type ceramic membrane materials for oxidative coupling of methane". United States. https://doi.org/10.1006/jcat.1996.0377.
@article{osti_486390,
title = {Catalytic properties of oxygen semipermeable perovskite-type ceramic membrane materials for oxidative coupling of methane},
author = {Lin, Y S and Zeng, Y},
abstractNote = {The catalytic properties for the oxidative coupling of methane (OCM) of La{sub 0.8}Sr{sub 0.2}CoO{sub 3} (LSC) and SrCo{sub 0.8}Fe{sub 0.2}O{sub 3}(SCF) in solid solution were studied and compared with those of 5 wt% Li/MgO, using a steady/unsteady state packed-bed reactor and a transient microbalance. The results of the steady-state cofeed experiments show that LSC possesses OCM catalytic properties similar to those of Li/MgO in terms of C{sub 2} yield and selectivity at temperatures of around 800 C. The former gives a larger C{sub 2} space time yield than the latter. SCF exhibits poor OCM catalytic properties at 700-850{degrees}C. To further examine the suitability of LSC as a membrane material for use in a dense membrane reactor for OCM, the instant OCM selectivity and activity and oxygen consumption rate for LSC and 5% Li/MgO on exposure to pure methane in cyclic feed mode were measured respectively at 850{degrees}C and 800{degrees}C. For both materials, the unsteady-state cyclic feed operation gives a smaller initial OCM activity and larger initial C{sub 2} selectivity than the cofeed steady state operation. Li/MgO quickly loses its OCM activity and selectivity in the unsteady state operation due to rapid consumption of the active sites. Up to 5 min of methane run time, LSC maintains appreciable OCM activity with poorer C{sub 2} selectivity as compared to the steady state cofeed operation. The surface of LSC membrane at low oxygen partial pressure may become nonselective for OCM in membrane reactor applications. 48 refs., 12 figs., 4 tabs.},
doi = {10.1006/jcat.1996.0377},
url = {https://www.osti.gov/biblio/486390}, journal = {Journal of Catalysis},
number = 1,
volume = 164,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1996},
month = {Fri Nov 01 00:00:00 EST 1996}
}