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Lanthanum Oxide Supported on Carbon Nanofibers as Solid Base Catalysts
Author(s) -
Frey Anne Mette,
Bitter Johannes Hendrik,
de Jong Krijn Pieter
Publication year - 2011
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.201100001
Subject(s) - lanthanum , catalysis , lanthanum oxide , inorganic chemistry , oxide , chemistry , carbon nanofiber , nuclear chemistry , organic chemistry
Bulk lanthanum oxide and lanthanum oxide supported on carbon nanofibers were studied as solid base catalysts. The impact of synthesis parameters on the supported catalysts, deposition method, aging, washing, and heat treatment temperature were investigated and evaluated by studying the catalytic activities in the self‐condensation reaction of acetone to diacetone alcohol. The initial activity of the carbon nanofiber (CNF) supported lanthanum oxide catalysts (48 mmol DAA h −1 g catalyst −1 , DAA=diacetone alcohol) was up by one order of magnitude compared to the activity of the bulk lanthanum oxide (4.4 mmol DAA h −1 g catalyst −1 ). The most active catalyst reported here was 12 wt % La 2 O 3 /CNF, prepared from a lanthanum nitrate precursor by precipitation with ammonia, followed by washing, drying, and heating at temperatures between 600–700 °C in nitrogen to activate the catalyst. Initial enthalpies for CO 2 adsorption, determined by using micro calorimetry, are approximately 155 kJ mol −1 (CO 2 uptake 0–5 μmol g −1 ) for supported samples with 12 wt % La 2 O 3 . TEM revealed well‐distributed and small (≈4 nm) lanthanum oxide particles on the support.