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- Title
Sponge Phase Producing Porous CeO<sub>2</sub> for Catalytic Oxidation of CO.
- Authors
Song, Shasha; Wang, Haiqiao; Song, Aixin; Dong, Shuli; Hao, Jingcheng
- Abstract
The aggregation behavior of mixtures of the alkaline amino acid L-Arginine ( L-Arg) and bis(2-ethylhexyl)phosphoric acid (DEHPA) in water was studied in detail. At a fixed L-Arg concentration, a phase sequence of micellar phase (L1 phase), vesicle phase (Lαv phase), planar lamellar phase (Lαl phase), and sponge phase (L3 phase) was obtained with increasing DEHPA concentration due to changes in the packing parameter. The phase transition of the lamellar structures was determined by freeze-fracture TEM and 2H NMR spectroscopy. Rheological measurements reflected the phase transition through significant variations of both the elastic modulus and the viscous modulus. Porous CeO2 materials were produced by utilizing the L3 phase as template, and the porous CeO2 exhibited excellent catalytic oxidation activity toward CO due to its high surface area, which provides more active sites for CO conversion.
- Subjects
ARGININE; CHEMICAL reactions; CATALYTIC oxidation; PHOSPHORIC acid; OXIDATION
- Publication
Chemistry - A European Journal, 2014, Vol 20, Issue 29, p9063
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201304836