Preparation and CO2 Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag

doi:10.12141/j.issn.1000-565X.240417

Abstract

Abstract:

LTA-type zeolites is considered a highly promising CO₂ capture material due to their excellent pore structures and high selectivity for CO₂ adsorption. This study presented a green and sustainable synthesis approach using industrial titanium-containing slag waste as a raw material to prepare Na-LTA zeolite precursors. Calcium loading was adjusted via a conventional liquid-phase ion exchange (LPIE) method to produce a series of xCa-LTA zeolites, specifically designed to enhance CO₂ adsorption performance. The adsorption properties of the xCa-LTA zeolites were systematically evaluated through dynamic adsorption experiments. Results show that xCa-LTA zeolites not only significantly enhances CO₂ capture capacity, but also exhibits excellent selectivity in CO₂/N₂ and CO₂/CH₄ separation processes, with the 0.05Ca-LTA sample demonstrating the most outstanding adsorption performance. Under conditions of 25 ℃ and 105 Pa, the CO₂ adsorption rate of 0.05Ca-LTA is 4.95 times that of Na-LTA, with a maximum adsorption capacity of 4.02 mmol/g. Kinetic analysis indicates that the CO₂ adsorption behavior of 0.05Ca-LTA follows a pseudo-second-order kinetic model, where the adsorption process is synergistically dominated by both physisorption and chemisorption. This synergy not only accelerated adsorption rates but also improved overall efficiency. After five adsorption/desorption cycles, 0.05Ca-LTA maintains highly efficient and stable adsorption performance, demonstrating excellent cyclic regeneration capability. This study follows the ecofriendly concept of “treating waste with waste” providing a new approach for the high-value utilization of solid waste while offering important theoretical and application potential for the synergistic optimization of CO₂ capture and environmental pollution control.

Key words: titanium-containing slag, Na-LTA zeolite, calcium ion exchange, CO₂ capture, adsorption mechanism

CLC Number:

X701

HUANGFU Lin, HE Zhengqing, ZHAO Shimin, ZHOU Xintao, LUO Zhongqiu, ZU Yun, SHANG Bo, LI Fangyuan. Preparation and CO₂ Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag[J]. Journal of South China University of Technology(Natural Science Edition), 2025, 53(3): 139-148.

Figures/Tables 12

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References 30

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样品	质量分数/%		比表面积/ （m²‧g^-1）		孔容/ （cm³‧g^-1）		介孔孔径/nm
样品	Ca	Na	BET	微孔	总孔	微孔	介孔孔径/nm
Na-LTA	0.16	14.72	14.8	7.8	0.026	0.004	8.411
0.01Ca-LTA	1.51	11.86	14.7	5.1	0.030	0.002	9.392
0.02Ca-LTA	1.66	10.75	11.9	6.5	0.031	0.003	12.414
0.05Ca-LTA	6.84	4.79	537.7	486.0	0.243	0.186	4.698
0.10Ca-LTA	7.51	4.45	520.4	484.6	0.240	0.184	6.920

样品	拟一级动力学模型			拟二级动力学模型
样品	q_e/（mmol‧g^-1）	k₁/min^-1	R²	q_e/（mmol‧g^-1）	k₂/（mmol‧（g·min）^-1）	R²
Na-LTA	1.939	1.540	0.674	1.964	1.416	0.916
0.01Ca-LTA	2.497	4.706	0.934	2.508	3.971	0.995
0.02Ca-LTA	2.892	2.280	0.986	2.915	1.609	0.945
0.05Ca-LTA	3.297	7.674	0.986	3.304	7.015	0.998
0.10Ca-LTA	3.346	7.674	0.987	3.353	6.375	0.995
0.25Ca-LTA	3.312	6.395	0.993	3.319	5.948	0.990

名称	吸附条件		吸附量/ （mmol‧g^-1）	来源
名称	压力/kPa	温度/K	吸附量/ （mmol‧g^-1）	来源
CaA	15.00	313	3.72	文献［28］
Ca-LTA-3	0.04	298	1.12	文献［18］
Micro-LTA	100.00	298	1.94	文献［29］
Meso-LTA	100.00	298	3.63	文献［29］
5A	100.00	298	3.68	文献［30］
5A@ZIF-8	100.00	298	0.31	文献［30］
Na-A	15.00	298	1.40	文献［28］
Mg-A	15.00	298	1.80	文献［28］
Ca-A	15.00	298	3.81	文献［28］
K-LTA	100.00	298	2.11	文献［28］
Ce-LTA	100.00	298	3.76	文献［28］
0.05Ca-LTA	100.00	298	4.02	文中

Preparation and CO₂ Adsorption Performance of Ca-LTA Zeolite Derived From Titanium-Containing Slag

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