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An Efficient Oxygen Activation Route for Improved Ammonia Oxidation through an Oxygen‐Permeable Catalytic Membrane
Author(s) -
Cao Zhengwen,
Jiang Heqing,
Luo Huixia,
Baumann Stefan,
Meulenberg Wilhelm A.,
Voss Hartwig,
Caro Jürgen
Publication year - 2014
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201400048
Subject(s) - partial oxidation , oxygen , catalysis , chemistry , selectivity , membrane , membrane reactor , ammonia , partial pressure , inorganic chemistry , adsorption , chemical engineering , photochemistry , organic chemistry , biochemistry , engineering
Upon using a reactant/oxygen mixture as co‐feed in partial oxidation, adsorbed surface molecular oxygen species can cause low selectivity. We propose a concept different from the conventional co‐feed partial oxidation process in packed‐bed reactors. In this new configuration, the activation of oxygen is separated from the catalytic oxidation by using an oxygen‐permeable membrane to suppress the formation of nonselective surface molecular oxygen species. A continuous flux of lattice oxygen through the membrane allows highly selective partial oxidation. In the oxidation of ammonia to NO, the NO selectivity was improved from 77 to 95 % if a La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3– δ oxygen‐permeable catalytically active membrane was used at 850 °C instead of a co‐feed fixed bed reactor.