酸改性NaY分子筛对高湿度下甲苯的吸附研究

doi:10.3969/j.issn.2097-2806.2025.03.006

Abstract

Abstract:

To solve the problem that the adsorption performance of molecular sieve on VOCs decreased sharply under humid conditions, in this work, hydrochloric acid and citric acid were respectively used to dealuminate NaY molecular sieve to prepare high-performance water-resistant NaY molecular sieve. X-ray diffraction （XRD）, N₂ adsorption-desorption, scanning electron microscopy （SEM） and X-ray fluorescence spectroscopy（XRF） were used to investigate the changes in the skeleton structure, specific surface area and element content of the NaY molecular sieve before and after modification. The adsorption of toluene was tested under static water vapor and humid conditions. The results showed that the adsorption capacity for static water vapor gradually decreased after modification. When the relative humidity （RH） was 80%, the most successful modification effect was indicated by 0.5M-CA-NaY molecular sieve whose breakthrough time and saturated adsorption capacity of toluene were 6 times and 4.3 times higher than that before modification, respectively. The adsorption kinetic model showed that the adsorption process of NaY molecular sieve before and after modification was mainly monolayer adsorption. After 5 cycles of adsorption-desorption, 0.5M-CA-NaY molecular sieve showed excellent regeneration performance and still had a recycling rate of more than 95%.

Key words: NaY molecular sieve, dealumination, dynamic adsorption, dynamic model, regenerability

CLC Number:

X511

Sheng Li, Jie Meng, Jingwei Liu, Bingying Gao, Chao Yao. Adsorption of toluene by acid-modified NaY molecular sieve at high humidity[J].China Surfactant Detergent & Cosmetics, 2025, 55(3): 313-321.

Figures/Tables 15

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样品	比表面积/ （m²/g）	总孔容/ （cm³/g）	平均孔径/ nm
NaY	688	0.33	1.89
0.5M-CA-NaY	320	0.19	1.79

样品	元素含量/%				Si/Al
样品	SiO₂	Al₂O₃	Na₂O	其他	Si/Al
NaY	67.05	20.56	11.9	0.49	5.5
0.5M-CA-NaY	73.6	16.7	9.46	0.24	7.5

Sample	Pseudo-first-order-model		Pseudo-second-order-model
Sample	k₁	R²	k₂	R²
RH=0%-NaY	0.010 7	0.982 1	4.465 2×10^-5	0.974 8
RH=0%-0.5M-CA-NaY	0.016 2	0.985 2	1.708 4×10^-4	0.977 2
RH=80%-NaY	0.125 9	0.996 1	1.020 0×10^-2	0.982 9
RH=80%-0.5M-CA-NaY	0.031 3	0.992 2	4.309 1×10^-4	0.986 2

Adsorption of toluene by acid-modified NaY molecular sieve at high humidity

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样品	RH=0%		RH=80%
样品	穿透时间/min	饱和吸附量/ （mg/g）	穿透时间/min	饱和吸附量/ （mg/g）
NaY	77	102	3	9
0.1M-HCl-NaY	52	82	5	16
0.5M-HCl-NaY	45	73	9	22
1M-HCl-NaY	33	53	17	36
2M-HCl-NaY	24	46	8	23
3M-HCl-NaY	18	42	6	15
0.1M-CA-NaY	61	80	6	34
0.5M-CA-NaY	48	70	18	39
1M-CA-NaY	35	57	13	43
2M-CA-NaY	32	51	10	29
3M-CA-NaY	28	51	9	22