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课题研究的工作开展汇报. Lijing Fan 2013.9.28. Existing problem. Absorption ratio of CaO at 600 ℃. TEM image of the “nanopod” CaCO 3. Sample conversion rate change over time. Higher-magnification SEM image. CO 2 adsorption capacity at 650 ℃ . Inset: the rate of CO 2 adsorption.
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课题研究的工作开展汇报 Lijing Fan 2013.9.28
Existing problem Absorption ratio of CaO at 600℃ TEM image of the “nanopod” CaCO3 Sample conversion rate change over time Higher-magnification SEM image CO2 adsorption capacity at 650℃. Inset: the rate of CO2 adsorption Ind. Eng. Chem. Res.2009，Synthesis and Characterization of CaO Nanopods for High Temperature CO2 Capture. J. Mater. Chem. A, 2013, 1, Synthesis, characterization, and high temperature CO2 capture of new CaO-baed hollow sphere sorbents.
PEO-b-PMAA-SDS NaCO3+CaCl2 CaCO3 Different SEM images of CaCO3 Adv. Mater.2002, Biomimetic Morphogenesis of Calcium Carbonate in Mixed Solutions of Surfactants and Double-Hydrophilic Block Copolymers.
Template-free hollow CaCO3 Hollow CaCO3 micro-spheres were synthesized with the reaction between Ca(CH3COO)2 and NaHCO3 in a solvent mixture of H2O and EG. A:Ca(CH3COO)2 (1 mL,0.3M),H2O(2mL) and EG(10mL) B: NaHCO3 (1 mL,0.3M),H2O (2mL) and EG(10mL) Procedure: (1).At room temperature the mixture was further stirred for 4h and a suspension of CaCO3 was obtained. (2).The products were collected after centrifugation, washing with water and ethanol. (3). Dry the product at 80℃ under vacuum. Materials Letters .2013,4.Synthesis of template-free hollow vaterite CaCO3 microspheres in the H2O/EG system
Template-free hollow CaCO3 (a) SEM image of CaCO3 microspheres; (b) the particle diameter distribution of CaCO3 microspheres; (c) high magnification SEM image of typical broken microspheres; (d) TEM image of the hollow microspheres. Schematic illustration of a possible formation process for the hollow spherical CaCO3, and typical SEM micrographs of vaterite CaCO3are shown: (a) reaction for5 min; (b) reaction for 30 min
Experiment (a) (b) 0.5M Ca(CH3COO)2 50ml + 0.5M NaHCO3 50ml + 50ml H2O,25ml EG Mixing and stirring 8h 50ml H2O,25ml EG (c) (d) (a)、(b)CaCO3 (c)、(d)CaCO3/Al2O3
Experiment (a) (b) (c) (a) CaCO3 calcite at 700℃，carbonate at 600℃/650℃ (b) CaCO3 calcite at 700℃，carbonate at 650℃ (c) CaCO3 with additive calcite at 700℃，carbonate at 650℃
Existing problem 1.size 2.hollow (a) (b) TEM image (a):CaCO3(b):CaO
Honeycomb arrays of porous calcium carbonate Preparation method: 1.Prepare calcium bicarbonate solution by bubbling carbon dioxide gas through an aqueous suspension of calcium carbonate. 2.Add dropwise to a rapidly stirred DDAB/tetradecane mixture(DDAB:(C12H25)2(CH3)2NBr). 3.Removal of the surfactant result in the honeycomb arrays of porous calcium carbonate. Intact hollow shells of mesoporous CaCO3 Nature ,1995,Fabrication of hollow porous shells of calcium carbonate from self-organizing media
Work plan 1.Repeat the literature to synthesize Template-free hollow CaCO3 and test its adsorption capacity for CO2. 2.Attempt to add optimal amount Al(NO)3 to obtain adsorbent with good sintering resistance and stability. 3.Refer to the literature ,synthesizing honeycomb arrays of porous calcium carbonate and test its adsorption capacity for CO2.
