Room-temperature ionic liquids modified zeolite SSZ-13 membranes for CO2/CH4 separation

Liu, Bo; Zhou, Rongfei; Bu, Na; Wang, Qing; Zhong, Shengwen; Wang, Bin; Kita, Hidetoshi

doi:10.1016/j.memsci.2016.11.004

Cited by 71 publications

(40 citation statements)

References 43 publications

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“…In this regard, zeolite membranes (e.g. SAPO-34 [9][10][11][12][13][14][15], DDR [16][17][18], AlPO-19 [19][20][21][22], and SSZ-13 [23][24][25][26]) have been widely studied for CO 2 /CH 4 separation due to their adsorption properties, uniform molecular-sized pores, and outstanding thermal as well as chemical stabilities [14,27,28]. Among these zeolite membranes, small pore zeolites such as SAPO-34 have attracted tremendous attention due to their size selective pore diameters.…”

Section: Introductionmentioning

confidence: 99%

Defects-healing of SAPO-34 membrane by post-synthesis modification using organosilica for selective CO2 separation

Chen

Xiang

et al. 2019

Journal of Membrane Science

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It is challenging to avoid the formation of defects in zeolite membranes during their preparation.Herein, we present a facile vacuum-assisted deposition (VAD) method as a feasible solution to address this challenge. Defective SAPO-34 membranes supported on tubular porous alumina were healed using bis(triethoxysilyl)ethane (BTESE)-derived organosilica via VAD and these showed an improved performance in the selective CO 2 separation from an equimolar CO 2 /CH 4 mixture. Specifically, by controlling the amount of organosilica deposited, the coating was able to heal the non-selective defects in SAPO-34 membranes without compromising the CO 2 permeance, but increased the CO 2 /CH 4 selectivity notably (by a factor of ca. 2.5 at 25 °C and 200 kPa). An excessive coating of organosilica by VAD resulted in a thick layer on top of the SAPO-34 membrane which led to a significant decrease in the CO 2 permeance. Additionally, a modified membrane was also investigated for the CO 2 /CH 4 gas feed with different CO 2 concentrations from 20-50 mol.% and this showed that a relatively concentrated CO 2 in the system could also be improved in terms of its separation performance.

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Section: Introductionmentioning

confidence: 99%

Defects-healing of SAPO-34 membrane by post-synthesis modification using organosilica for selective CO2 separation

Chen

Xiang

et al. 2019

Journal of Membrane Science

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“…Inorganic membranes have good hydrothermal stability, mechanical strength, and chemical resistance, which are promising candidates for gas separation [8]. Recently, zeolite membranes, such as zeolite T, DDR, MFI, CHA, and metal-organic framework (MOF) membranes have gained much attention for natural gas purification [8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. …”

Section: Introductionmentioning

confidence: 99%

“…SSZ-13 zeolite membranes had good selectivity and permeance for CO 2 /CH 4 separation [3,21,22]. In particular, the high-silica zeolite membrane had low polarity and few non-zeolitic molecular trafficking pathways [25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

et al. 2018

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Continuous and high silica SSZ-13 zeolite membranes were prepared on porous mullite supports from high SiO2/Al2O3 ratio or aluminum-free precursor synthesis gel. Single gas permeance (CO2 and CH4) of the high silica SSZ-13 zeolite membrane was decreased with the SiO2/Al2O3 ratio in the precursor synthesis gel, while the ideal CO2/CH4 selectivity of the membrane was gradually increased. Moreover, effects of synthesis conditions (such as H2O/SiO2 and RNOH/SiO2 ratios of precursor synthesis gel, crystallization time) on the single gas permeance performance of high silica SSZ-13 zeolite membranes were studied in detail. Medium H2O/SiO2 and RNOH/SiO2 ratios in the initial synthesis gel were crucial to prepare the good CO2 perm-selective SSZ-13 zeolite membrane. When the molar composition of precursor synthesis gel, crystallization temperature and time were 1.0 SiO2: 0.1 Na2O: 0.1 TMAdaOH: 80 H2O, 160 °C and 48 h, CO2 permeance and ideal CO2/CH4 selectivity of the SSZ-13 zeolite membrane were 0.98 × 10−7 mol/(m2·s·Pa) and 47 at 25 °C and 0.4 MPa. In addition, the SiO2/Al2O3 ratio of the corresponding SSZ-13 zeolite was 410 by X-ray fluorescence spectroscopy.

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“…The XRD curve and SEM images of synthetic SSZ-13 zeolite are shown in Figures S1 and S2. The result indicates the zeolite presents obvious CHA structural features [30,31]. Figure 1 shows the NH 3 -SCR activity of these Cu-Mn catalysts.…”

Section: Activity Testmentioning

confidence: 98%

Co-Exchange of Mn: A Simple Method to Improve Both the Hydrothermal Stability and Activity of Cu–SSZ-13 NH3–SCR Catalysts

Zhang

et al. 2019

Catalysts

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A series of Cu–Mn–SSZ-13 catalysts were obtained by co-exchange of Mn and Cu into SSZ-13 together (ion exchange under a mixed solution of Cu(NO3)2 and Mn(NO3)2) and compared with Cu–SSZ-13 catalysts on the selective catalytic reduction (SCR) of nitric oxide (NO) by ammonia. The effects of total ion exchange degree and the effect of Mn species on the structure and performance of catalysts before and after hydrothermal aging were studied. All fresh and aged catalysts were characterized with several methods including temperature-programmed desorption with NH3 (NH3-TPD), X-ray diffraction (XRD), 27Al and 29Si solid-state nuclear magnetic resonance (NMR), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and low-temperature N2 adsorption–desorption techniques. The results showed that the increase of the total ion exchange degree can reduce the content of residual Brønsted acid sites of catalysts, thus relieved the dealumination and the decrease of crystallinity of the catalyst during hydrothermal aging. The moderate addition of a Mn component in Cu–Mn–SSZ-13 catalysts significantly increased the activity of NO conversion at low temperature range. The selected Cu(0.2)Mn(0.1)–SSZ-13 catalyst achieved a high NO conversion of >90% in the wide and low temperature range of 175–525 °C and also exhibited good N2 selectivity and excellent hydrothermal stability, which was related to the inhibition of the Mn component on the aggregation of Cu species and the pore destruction of the catalyst during hydrothermal aging.

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Room-temperature ionic liquids modified zeolite SSZ-13 membranes for CO2/CH4 separation

Cited by 71 publications

References 43 publications

Defects-healing of SAPO-34 membrane by post-synthesis modification using organosilica for selective CO2 separation

Defects-healing of SAPO-34 membrane by post-synthesis modification using organosilica for selective CO2 separation

Single Gas Permeance Performance of High Silica SSZ-13 Zeolite Membranes

Co-Exchange of Mn: A Simple Method to Improve Both the Hydrothermal Stability and Activity of Cu–SSZ-13 NH3–SCR Catalysts

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