Sonochemical synthesis of single-crystalline CeOHCO₃rods and their thermal conversion to CeO₂rods

Abstract

Single-crystalline CeOHCO 3 rods with an orthorhombic structure have been successfully synthesized by the sonochemical method from aqueous solution containing CeCl 3 and urea. Polycrystalline CeO 2 rods have been prepared by thermal conversion of single-crystalline CeOHCO 3 rods at 500 • C in air. CeOHCO 3 and CeO 2 rods were characterized by x-ray powder diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and differential scanning calorimetric analysis (DSC).

Synthesis, characterization and formation mechanism of dumbbell-like YOHCO3 and rod-like Y2(CO3)3·2.5H2O

“…Urea is used to gradually raise the pH value of the reaction mixture, because on heating above 60 • C it undergoes hydrolysis and releases a small quantity of CO 3 2− and OH − . Syntheses of rare-earth compounds through urea decomposition have received considerable attention over the past several years [11,12].…”

Morphology‐Controllable Preparation of CeO2 Materials for CO2 Adsorption

“…Lykhach [13,14] also found that CeO 2 activation led to the rapid formation of carbonate and surface carboxylates. Meanwhile, various 1D and 2D CeO 2 nanostructures, [15][16][17] including nanorods, [18] nanowires, [19] nanotubes, [20,21] nanobelts [22,23] and other morphologies [24][25][26][27][28] had been synthesized via the thermal decomposition of CeCO 3 OH precursors, which was often prepared by solution precipitation, [29] sol-gel, [30] microemulsion, [31] sonochemical, [32] hydrothermal methods. [33] However, these synthetic processes usually were complicated with high synthesis cost due to the expensive templates and additives.…”

Preparation and Characterization of Nanocrystalline Cerium (IV) Oxide and Doped Cerium (IV) Oxide, Ce_1-x-yMg_xZr_yO_2-?

“…Several papers have been published about doped CeO 2 with various cationsdopants, such as Ca, Al, Zr, Nd, Pb, Mn, Mg, Cu, Zn, Co, Y, Ba and Sr [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. Literature survey shows that nanocrystalline ceria have been prepared by means of a variety of methods such as sol-gel process [29], hydrothermal or solvothermal synthesis [30,31], micro-emulsion [32], co-precipitation [33,34], conventional solid state method, flow method [35], microwave hydrothermal method [36], sonochemical synthesis [37], thermal decomposition [38], spray pyrolysis [39] etc. These methods operate mainly on high pressure, salt-solvent mediated high temperature or surface capping agent and the sizes of ceria particles are relatively large.…”