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Digitale Medien

Oxidative coupling of methane over LaF3/La2O3 catalysts (1994)

Au, C. T. ; Zhang, Y. Q. ; Ng, C. F. ; [weitere]

Springer

Catalysis letters 23 (1994), S. 377-386

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ISSN: 1572-879X

Schlagwort(e): Oxidative coupling of methane ; LaF3 ; La2O3 ; rhombohedral LaOF

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract We studied the oxidative coupling of methane over the LaF3/La2O3 (50∶50) catalyst. The catalyst was found active even at 873 K. At 1023 K, the C2 yield was 12.7% at 26.0% CH4 conversion and 49.1% C2 selectivity. It was found to be stable and had a lifetime not less than 50 h at 1023 K. The catalyst was effective in C2H6 conversion to C2H4. XRD results indicated that the catalyst was mainly rhombohedral LaOF. It is suggested that the catalyst has ample stoichiometric defects and generates active oxygen sites suitable for methane dehydrogenation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00811372

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Digitale Medien

Preparation and characterization of rare earth orthovanadates for propane oxidative dehydrogenation (1996)

Au, C. T. ; Zhang, W. D. ; Wan, H. L.

Springer

Catalysis letters 37 (1996), S. 241-246

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ISSN: 1572-879X

Schlagwort(e): rare earth orthovanadates ; citrate method ; propane oxidative dehydrogenation ; redox property

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract High purity rare earth orthovanadates (REVO4), YVO4, LaVO4, CeVO4, NdVO4, SmVO4 and EuVO4, were prepared by the citrate method. XRD, FT-IR, LRS and TPR techniques were employed to characterize these orthovanadates. The catalytic performance of SmVO4, LaVO4 and YVO4 in the oxidative dehydrogenation of propane can compete with that of Mg3V2O8. The selectivity of propene over CeVO4, NdVO4 and EuVO4 was relatively lower. The correlation between the reducibility and the selectivity of the catalysts implied that the V4+/V3+ couple might be involved in the dehydrogenation process.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00807761

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Digitale Medien

Pulse studies of CH4 interaction with NiO/Al2O3 catalysts (1994)

Au, C. T. ; Hu, Y. H. ; Wan, H. L.

Springer

Catalysis letters 27 (1994), S. 199-206

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ISSN: 1572-879X

Schlagwort(e): pulse reaction ; NiO/Al2O3 catalysts ; methane activation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Pulse studies of the interaction of CH4 and NiO/Al2O3 catalysts at 500°C indicate that CH4 adsorption on reduced nickel sites is a key step for CH4 oxidative conversion. On an oxygen-rich surface, CH4 conversion is low and the selectivity of CO2 is higher than that of CO. With the consumption of surface oxygen, CO selectivity increases while the CO2 selectivity falls. The conversion of CH4 is small at 500°C when a pulse of CH4/O2 (CH4∶O2=2∶1) is introduced to the partially reduced catalyst, indicating that CH4 and O2 adsorption are competitive steps and the adsorption of O2 is more favorable than CH4 adsorption

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00806993

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