Morphology and size control of cerium carbonate hydroxide and ceria micro/nanostructures by hydrothermal technology

Characterization of CeO 2 crystals synthesized with different amino acids

“…It is reported in the literature that the hexagonal CeOHCO 3 structure is usually formed at higher temperatures under hydrothermal conditions. Guo et al [12] reported triangular microplates of CeCO 3 OH with the hexagonal phase using cetyltrimethylammonium bromide as a surfactant at 150°C for 16 h. Cui et al [20] reported that the ratio of the orthorhombic CeOHCO 3 structure decreased and the formation of hexagonal phases increased at higher temperatures above 150°C. Under our experimental conditions of 130°C for a period of 12 h, we were able to obtain the monophase hexagonal structures.…”

Effect of Microgravity on Synthesis of Nano Ceria

“…A variety of methods to synthesize ceria have been reported until now, including precipitation [20], spray pyrolysis [21,22], thermal hydrolysis [23], micro-emulsion [24], combustion [25], sonochemical [26], hydrothermal [27], solvothermal [28,29], and sol-gel [30] techniques. It is a well-established fact that changing the synthesis parameters, such as temperature, pressure, pH, and crystallization time, produces different particle sizes and morphologies, which, in turn, alter the physical and chemical properties of ceria, as well as the catalytic performance of the ceria-supported catalysts.…”

“…To the best of our knowledge, there have not been any publications for the synthesis of nanorods under such conditions. In most cases, studies have concluded that ceria nanorods are formed at much higher temperatures and pressures [27,[46][47][48][49]. In order to understand the formation of ceria nanorods under microgravitiy condition, two crystal growth processes, Oswald ripening and oriented attachment, can be considered.…”

Synthesis and Characterization of Hybrid Mg(OH)2 and CeCO3OH Composite with Improved Activity Towards Henry Reaction

“…[14][15][16][17][18] The synthesis of CeCO 3 OH has been reported by variousr esearchers using different methodologies like self-assembly,h ydrothermal, microwave-assisted hydrothermalr outes. [19][20][21][22][23][24][25][26][27][28][29] Herein, we report the synthesis of mixed magnesium hydrox-ide and cerium carbonate hydroxide using ac o-precipitation methodw ith high basicity thats leads to the Henry reaction. The Henry reaction was carried out using mixed Mg(OH) 2 and CeCO 3 (OH) (MgCe-HDC) under solvent-free conditions at 20 8C (Scheme 1).The Henryr eaction between 2-nitrobenzaldehyde and nitromethane wasc arriedo ut at 20 8Cf or 8h using differentc atalysts out of which MgCe-HDC showed the best conversion (Table 1, and see the Supporting information).…”