Adsorption Behavior of Toluene on Modified 1X Molecular Sieves

Figures & data

Figure 1. Experimental flow in adsorptive fixed-bed reactor: (1) air compressor; (2) gas generator; (3) humidifier; (4) gas mixture buffer; (5) adsorption column; (6) heater; (7), (8), (9), (10), (11), and (12) sampling ports; (13) absorber; and (14) dehumidifier.

Figure 2. XRD pattern of M-13X; triangle represents the 13X crystalline phase.

Figure 3. XRD pattern of 13X; triangle represents the 13X crystalline phase.

Figure 4. SEM images of (a) M-13X and (b) 13X.

Figure 5. Pore size distributions of 13X and M-13X.

Table 1. Structural parameters and adsorption properties of adsorbents

				Toluene saturated capacity/(g/g)
Samples	SBET/(m2/g)	VTotal/(mL/g)	Average pore diameter/ (D/nm)	Dry	RH = 50%	Carrier gas	References
HY	681	0.47	—	0.077	—	N2	Baek et al., 2004
HZSM-5	410	0.13	—	0.046	—	N2	Serra et al., 2012
Cs7NaMOR	344	0.14	—	0.082	—	N2	Serra et al., 2011
13X	415.17	0.30	2.91	0.055	0.037	Air	—
M-13X	414.36	0.31	2.98	0.048	0.045	Air	—

Table 2. Molecular composition of adsorbents (%)

Adsorbent	Si	Al	Ca	Mg
13X	21.68	16.97	7.47	2.10
M-13X	38.93	5.75	0.27	0.126

Figure 6. Adsorption isotherms of water on 13X and M-13X.

Figure 7. Breakthrough curves under different relative humidities of adsorbents.

Figure 8. Influence of temperature on desorption on M-13X.

Baek , S. , Kim , J. and Ihm , S. 2004 . Design of dual functional adsorbent/catalyst system for the control of VOC's by using metal-loaded hydrophobic Y-zeolites . Catal. Today , 93–95 : 575 – 581 . doi: 10.1016/j.cattod.2004.06.107

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Serra , R. M. , Miró , E. E. , Bolcatto , P. G. and Boix , A. V. 2012 . Experimental and theoretical studies about the adsorption of toluene on ZSM-5 and mordenite zeolites modified with Cs . Micropor. Mesopor. Mater , 147 : 17 – 29 . doi: 10.1016/j.micromeso.2011.05.016

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