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Spray‐flame synthesis of La(Fe, Co)O 3 nano‐perovskites from metal nitrates
Author(s) -
Angel Steven,
Neises Julian,
Dreyer Maik,
Friedel Ortega Klaus,
Behrens Malte,
Wang Yuan,
Arandiyan Hamidreza,
Schulz Christof,
Wiggers Hartmut
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16748
Subject(s) - nano , metal , catalysis , chemical engineering , ethanol , particle size , fourier transform infrared spectroscopy , nanoparticle , particle size distribution , inorganic chemistry , materials science , selected area diffraction , chemistry , nuclear chemistry , organic chemistry , metallurgy , nanotechnology , engineering , transmission electron microscopy
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.