Preparation of Sn-doped MFI Molecular Sieve Membrane by CVD Method and Its Separation Performance for Ethanol/water System

doi:10.7503/cjcu20200465

Abstract

Abstract:

Sn-modified MFI zeolite membranes were prepared by chemical vapor deposition（CVD） method using anhydrous SnCl₄ as Sn source， and were applied for the separation of alcohol-water mixture by pervaporation. SEM， XRD， ²⁹Si NMR and UV-Vis analyses showed that Sn can be introduced into the framework of MFI zeolite membranes by CVD process with their structure remained. The surface Si—OH groups can be effectively reduced after the incorporation of Sn， and the obtained membranes showed improved stability. The zeolite membrane prepared with 3 mL of SnCl₄ at autoclave bottom and the reaction time of 1 h had the best separation performance and also showed a long-term stability for the separation of 5% ethanol/water mixture at 60 ℃. After 50 h， the permeation flux slightly decreased from 1.52 kg·m^-2·h^-1 to 1.38 kg·m^-2·h^-1， and the separation factor decreased from 18 to 16.

Key words: MFI molecular sieve membrane, Sn modification, Chemical vapor deposition（CVD） method

CLC Number:

O613.72

TrendMD:

PENG Li, WU Zhengqi, WANG Xing, WANG Boxuan, GU Xuehong. Preparation of Sn-doped MFI Molecular Sieve Membrane by CVD Method and Its Separation Performance for Ethanol/water System[J]. Chem. J. Chinese Universities, 2020, 41(12): 2710.

Figures/Tables 12

References 23

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Before modification		After modification
Permeation flux/(kg·m^-2·h^-1)	Separation factor	Modification time/h	Permeation flux/(kg·m^-2·h^-1)	Separation factor
3.04	38	0.5	1.84	26
2.96	40	1.0	1.61	18
3.03	39	1.5	1.12	10
3.15	36	2.0	0.83	8

Before modification		After modification
Permeation flux/(kg·m^-2·h^-1)	Separation factor	Modification time/h	Permeation flux/(kg·m^-2·h^-1)	Separation factor
3.04	38	0.5	1.84	26
2.96	40	1.0	1.61	18
3.03	39	1.5	1.12	10
3.15	36	2.0	0.83	8

Before modification		V(SnCl₄)/mL	After modification
Permeation flux/(kg·m^-2·h^-1)	Separation factor	V(SnCl₄)/mL	Permeation flux/(kg·m^-2·h^-1)	Separation factor
2.94	34	1	1.82	26
3.11	36	2	1.70	20
2.96	40	3	1.61	18
3.01	37	4	1.32	15
2.90	36	5	0.94	10

Before modification		V(SnCl₄)/mL	After modification
Permeation flux/(kg·m^-2·h^-1)	Separation factor	V(SnCl₄)/mL	Permeation flux/(kg·m^-2·h^-1)	Separation factor
2.94	34	1	1.82	26
3.11	36	2	1.70	20
2.96	40	3	1.61	18
3.01	37	4	1.32	15
2.90	36	5	0.94	10

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