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Spray‐flame synthesis of La(Fe, Co)O 3 nano‐perovskites from metal nitrates
Ist Teil von
AIChE journal, 2020-01, Vol.66 (1)
Erscheinungsjahr
2020
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Abstract
Nano‐sized perovskites were synthesized in a spray flame from nitrate precursors dissolved in ethanol and in ethanol/2‐ethylhexanoic acid (2‐EHA) mixtures. Experiments with ethanol led to a broad particle‐size distribution and to the formation of undesired phases such as La
2
CoO
4
, La
2
O
3
, and Co
3
O
4
. The addition of 2‐EHA can initiate micro explosions of the burning droplets and has been systematically investigated toward the formation of single‐phase, high‐surface‐area LaCoO
3
and LaFeO
3
with a narrow size distribution. To investigate the effect of 2‐EHA, temperature‐dependent changes of the chemical composition of the precursor solutions were analyzed with ATR‐FTIR between 23 and 70°C. In all cases, the formation of esters was identified while in the solutions containing iron, additional formation of carboxylates was observed. The synthesized materials were characterized by BET SSA, XRD, SAED and EDX‐TEM and their catalytic activity was analyzed, reaching 50% CO conversion at temperatures below 160 and 300°C for LaCoO
3
and LaFeO
3
, respectively.
Sprache
Englisch
Identifikatoren
ISSN: 0001-1541
eISSN: 1547-5905
DOI: 10.1002/aic.16748
Titel-ID: cdi_crossref_primary_10_1002_aic_16748
Format
–
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