课题研究的工作开展汇报

Lijing Fan2013.9.28

Existing problem

Sample conversion rate change over time

TEM image of the “nanopod” CaCO3 Absorption ratio of CaO at 600℃

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.

Different SEM images of CaCO3

NaCO3+CaCl2 CaCO3

PEO-b-PMAA-SDS

Adv. Mater.2002, Biomimetic Morphogenesis of Calcium Carbonate in Mixed Solutions of Surfactants and Double-Hydrophilic Block Copolymers.

Materials Letters .2013,4.Synthesis of template-free hollow vaterite CaCO3 microspheres in the H2O/EG system

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.℃

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

(a) (b)

(c) (d)

(a)、 (b)CaCO3

(c)、 (d)CaCO3/Al2O3

Experiment

0.5M Ca(CH3COO)2 50ml + 0.5M NaHCO3 50ml +

50ml H2O,25ml EG

50ml H2O,25ml EG

Mixing and stirring 8h

Experiment

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initial capacity

(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℃

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650℃吸附 600℃吸附

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(a) (b) (c)

Existing problem

1.size

2.hollow

TEM image (a):CaCO3(b):CaO

(a) (b)

Intact hollow shells of mesoporous CaCO3

Nature ,1995,Fabrication of hollow porous shells of calcium carbonate from self-organizing media

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.

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.

Thanks for your attention!

Mechanism