CaO 作为高温 CO 2 吸附剂的文献调研报告

1. CaO作为高温CO2吸附剂的文献调研报告 Lijing Fan 2013.8.16

2. Contents Brief background information Different structure material CaO nanopod CaO hollow sphere Hollow CaCO3 Microspheres Work plan

3. Background Carbon dioxide emission Billion ton CO2 Billion ton oil BP2030 World Energy Outlook

4. CO2 capture and storage (CCS) First, any chemical employed to capture CO2 will rapidly exhaust its global supplies if it is used in a once-through manner; Second, any chemical produced from CO2 as a reactant will rapidly saturate global markets for that chemical High efficiency Low cost Regenerable

5. CaO-Based adsorbents CaO advantages: Wide availability Low cost Easy handling Highinitial adsorption quantity The choice of the precursor The preparation methods Change the morphology and structure Chemical treatments and reactivation Use of additives surfactant biomimetic template CaO Nanopods CaO Hollow Sphere Hollow CaCO3 Microspheres

6. Hollow structure? • The critical layer thickness of the product CaO+CO2 ⇄ CaCO3 20-50nm Step1:fast surface reaction Step2:slow diffusion

7. CaO Hollow Nanopods Tri-block copolymer, P123 (PEO20PPO70PEO20) Schematic diagram of a slurry bubble column used for the synthesis of CaCO3 nanopods. TEM image of the “nanopod” CaCO3 Ind. Eng. Chem. Res.2009，Synthesis and Characterization of CaO Nanopods for High Temperature CO2 Capture.

8. Adsorption capacity

9. The role of PEO20PPO70PEO20 CaCO3nanopods prepared in the presence of P123 surfactant CaCO3 prepared without P123

10. The role of PEO20PPO70PEO20 CaO derived from A CaO derived from B P123 (PEO20PPO70PEO20)- tri-block copolymer surfactant, helps to stabilize the CO2 bubbles, which form a template for the assembly of the CaCO3 nanopods.

11. CaO Hollow Sphere MesoscopicCaO/Ca12Al14O33 hollow nanospheres Template:core (interior polystyrene core)–shell (sulfonatedhydrogel shell) gel particles Precursors : calcium chloride dihydrate : aluminum isopropoxide =85:15 in weight ratio Diagram of the formation mechanism of the CaO/Ca12Al14O33 hollow spheres J. Mater. Chem. A, 2013, 1, Synthesis, characterization, and high temperature CO2 capture of new CaO based hollow sphere sorbents.

12. Material characterization Higher-magnification SEM image XRD patterns of hollow sphere sorbents with different CaO/Ca12Al14O33 ratios TEM image of hollow spheres

13. Adsorption capacity CO2 adsorption capacity at experimental condition. Inset: the rate of CO2 adsorption CO2 capture capacity as a function of the cycle number Theoretical maximum possible capacity：0.59g CO2/g adsorbent void space in hollow structures Reasons for high adsorption capability mesoscopic sorbents The inert Ca12Al14O33 binders

14. Work plan 1. According to the literature ,repeating the experiment of synthesizing hollow CaCO3nanopod and investigating its adsorption capacity. 2. Adding aluminum isopropoxide to improve the cycle stability of nanopodCaO. 3. Consulting more literature about CaO-based adsorbent with different structure such as CaCO3 hexagonal plates, rod-like particles, and multi-branched hierarchical structures.

15. Thanks for your attention!

16. Hollow CaCO3 Microspheres CaCl2(aq) + 2NH4OH (aq) + CO2(g) CaCO3(s) + 2NH4Cl(aq) + H2O calcite CaCO3 crystalline phases aragonite vaterite 4-（2-乙胺基）苯-1,2-二酚 J. Mater. Chem., 2011, Bio-inspired mineralization of CO2 gas to hollow CaCO3 microspheres and bone hydroxyapatite/polymer composites

17. Hollow CaCO3 Microspheres Bio-inspired Hollow CaCO3 Microspheres SEM image Confocal microscopic image Schematic illustration of the experimental procedure for conversion of CO2 gas to hollow vaterite

18. Experimental scheme + . Dopamine HCl calcination CaCl2(aq) + 2NH4OH (aq) CaCO3 CaO CO2

19. Existing problems: 1.The bio-inspired simulation is hard to realize 2.Material size: BET surface area-6.18m2/g, pore volume- 0.021cm3/g 3.Crystal phase transition