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Oxidative coupling of methane over a La 2 O 3 /CaO catalyst. Optimization of reaction conditions in a bubbling fluidized‐bed reactor
Author(s) -
Mleczko L.,
Pannek U.,
Rothaemel M.,
Baerns M.
Publication year - 1996
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450740213
Subject(s) - oxidative coupling of methane , selectivity , catalysis , fluidized bed , chemistry , methane , dilution , yield (engineering) , ethylene , analytical chemistry (journal) , inorganic chemistry , nuclear chemistry , materials science , chromatography , organic chemistry , metallurgy , thermodynamics , physics
Oxidative coupling of methane over a La 2 O 3 /CaO catalyst was investigated in laboratory‐scale fluidized‐bed reactors (ID = 5 and 7 cm) in the following range of reaction conditions: T = 700 – 880°C, P CH 4= 41 – 72 kPa and P O 2= 6 – 29 kPa. The maximum C 2+ selectivity and yield amounted to 73.8% ( T = 800°C, X CH 4= 13.1%, Y C 2+= 9.7%) and 16.0% ( T = 840°C, X CH 4= 34.0%, S C 2+= 47.2%), respectively. Axial gas concentration profiles revealed that C 2+ selectivity was not only influenced by oxidative consecutive reactions, but also by steam reforming of ethylene. When diluting the catalytic bed ( m cat = 145 g) with quartz ( m siO 2= 200 and 400 g), a slight decrease of the selectivity (1–2%) was observed. The dilution of the feed gas with nitrogen only led to only a small increase (< 2%) of the C 2+ selectivity.