Sponge Phase Producing Porous CeO₂ for Catalytic Oxidation of CO

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 (2)H 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.

Hydrogels Triggered by Metal Ions as Precursors of Network CuS for DNA Detection

“…A similar morphology has been reported in other hydrogel and biomolecular systems 68. 69 Well‐resolved 2D lattice fringes with a lattice spacing of 0.28 nm were observed in the high‐resolution transmission electron microscopy (HR‐TEM) image (Figure 8 b), which corresponds to the interplanar distance of (103) of the hexagonal CuS. The SEM image (Figure 8 c) provides the view at a larger scale, also demonstrating the porous property.…”

Influence of isovalent and aliovalent dopants on the reactivity of cerium oxide for catalytic applications

“…[49]. Therefore, the CO oxidation reaction was also considered as a model reaction to assess the catalytic activity of the prepared materials.…”

One-step fabrication and characterization of hierarchical MgFe2O4 microspheres and their application for lead removal

“…In recent years, hierarchical nanostructures have attracted considerable attention due to their unique properties and potential applications in adsorption [1][2][3][4], catalysis [5][6][7], drug delivery [8,9], supercapacitors [10][11][12], Lithium-Ion batteries [13][14][15] and sensors [16][17][18]. Till now, substantial efforts have been dedicated to develop methods for design and synthesis of various hierarchical nanostructures with great progress achieved.…”