CaO 作为高温 CO 2 吸附剂的文 献调研报告 Lijing Fan

Contents Brief background information Work plan Different structure material CaO nanopod CaO hollow sphere Hollow CaCO 3 Microspheres

Background BP2030 World Energy Outlook Carbon dioxide emission Billion ton CO 2 Billion ton oil

CO 2 capture and storage (CCS) High efficiency Low cost Regenerable First, any chemical employed to capture CO 2 will rapidly exhaust its global supplies if it is used in a once-through manner; Second, any chemical produced from CO 2 as a reactant will rapidly saturate global markets for that chemical

CaO-Based adsorbents CaO advantages: Wide availability Low cost Easy handling High initial adsorption quantity 1.The choice of the precursor 2.The preparation methods 3.Change the morphology and structure 4.Chemical treatments and reactivation 5.Use of additives CaO Nanopods CaO Hollow Sphere Hollow CaCO 3 Microspheres surfactant template biomimetic

The critical layer thickness of the product CaO+CO 2 ⇄ CaCO 3 Hollow structure? Step1:fast surface reaction Step2:slow diffusion 20-50nm

CaO Hollow Nanopods Ind. Eng. Chem. Res.2009 ， Synthesis and Characterization of CaO Nanopods for High Temperature CO 2 Capture. Tri-block copolymer, P123 (PEO 20 PPO 70 PEO 20 ) TEM image of the “nanopod” CaCO 3 Schematic diagram of a slurry bubble column used for the synthesis of CaCO 3 nanopods.

Adsorption capacity Material BET surface area [m 2 /g] total pore volume [cm 3 /g] CaO nanopods CaO commercially available

The role of PEO 20 PPO 70 PEO 20 CaCO 3 nanopods prepared in the presence of P123 surfactant CaCO 3 prepared without P123

The role of PEO 20 PPO 70 PEO 20 CaO derived from A CaO derived from B P123 (PEO 20 PPO 70 PEO 20 )- tri-block copolymer surfactant, helps to stabilize the CO 2 bubbles, which form a template for the assembly of the CaCO 3 nanopods.

CaO Hollow Sphere J. Mater. Chem. A, 2013, 1, Synthesis, characterization, and high temperature CO2 capture of new CaO based hollow sphere sorbents. Diagram of the formation mechanism of the CaO/Ca 1 2 Al 14 O 33 hollow spheres Mesoscopic CaO/Ca 12 Al 14 O 33 hollow nanospheres Template:core (interior polystyrene core)–shell (sulfonated hydrogel shell) gel particles Precursors : calcium chloride dihydrate : aluminum isopropoxide =85:15 in weight ratio

Material characterization Higher-magnification SEM image TEM image of hollow spheres XRD patterns of hollow sphere sorbents with different CaO/Ca 12 Al 14 O 33 ratios

Adsorption capacity CO 2 adsorption capacity at experimental condition. Inset: the rate of CO 2 adsorption CO 2 capture capacity as a function of the cycle number Reasons for high adsorption capability void space in hollow structures mesoscopic sorbents The inert Ca 12 Al 14 O 33 binders Theoretical maximum possible capacity ： 0.59g CO 2 /g adsorbent

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

CaCl 2 (aq) + 2NH 4 OH (aq) + CO 2 (g) CaCO 3 (s) + 2NH 4 Cl(aq) + H 2 O Hollow CaCO 3 Microspheres 4- （ 2- 乙胺基）苯 -1,2- 二酚 CaCO 3 crystalline phases calcite aragonite vaterite J. Mater. Chem., 2011, Bio-inspired mineralization of CO 2 gas to hollow CaCO 3 microspheres and bone hydroxyapatite/polymer composites

Hollow CaCO 3 Microspheres Schematic illustration of the experimental procedure for conversion of CO 2 gas to hollow vaterite Bio-inspired Hollow CaCO 3 Microspheres SEM imageConfocal microscopic image

Experimental scheme. HCl + Tris-base Tris-HCl Dopamine CaCl 2 (aq) + 2NH 4 OH (aq) CO 2 calcination CaCO 3 CaO

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