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Abstract

Microporous crystalline oxides are evaluated as potential catalysts for the oxidative coupling of methane into higher hydrocarbons (C(2)+). The use of shape-selective zeolite catalysts, for the conversion of the primary products from oxidative coupling reactions in the gas phase into high yields of aromatics, is demonstrated. Dense complex crystalline oxides are prepared by the citrate and oxalate methods. Solid solutions of alkaline earth metals and lanthanide element oxides and substituted perovskites prepared by the citrate method show a superior C(2)+ selectivity, compared to catalysts prepared by conventional methods. The performances of perovskites substituted with alkaline earth metals are comparable to those of alkali metal containing catalysts. A reaction mechanism for the oxidative coupling of methane on oxide catalysts is derived from (18)O isotope labelling and MAS NMR experiments and the reaction kinetics. Non-catalytic oxidative coupling of methane is performed in an empty reactor tube. The C(2)+ yields that can be obtained in the homogeneous gas phase reactions are only slightly inferior to the yields obtained on the best available catalysts.

Additional information

Authors: VERMEIREN W J M, Katholieke Universiteit Leuven, Laboratorium voor Oppervlaktechemie, Heverlee (BE);LENOTTE I D M L, Katholieke Universiteit Leuven, Laboratorium voor Oppervlaktechemie, Heverlee (BE);MARTENS J A, Katholieke Universiteit Leuven, Laboratorium voor Oppervlaktechemie, Heverlee (BE);JACOBS P A, Katholieke Universiteit Leuven, Laboratorium voor Oppervlaktechemie, Heverlee (BE)
Bibliographic Reference: EUR 13632 EN (1991) 160 pp., MF, ECU 8
Availability: (2)
Record Number: 199110615 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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