Down-sizing the crystal size of ZK-5 zeolite for its enhanced CH4 adsorption and CH4/N2 separation performances

Tang, Xuan; Liu, Jiaqi; Wang, Jun; Shang, Hua; Wu, Luogang; Li, Jinping; Deng, Shuguang

doi:10.1016/j.cej.2020.126599

Cited by 46 publications

(25 citation statements)

References 37 publications

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“…As can be seen, the CH 4 /N 2 selectivity exhibited the largest values (1.85) at 0°C, but (0.70) at 25°C. Compared with reported literature, the separation coefficient of N 2 /CH 4 reached 4.2 for ZK-5 zeolite at 298 K and 1 bar, [45] 2.7 for SAPO-34, [46] and 3.0 for ALPO-18, [47] but 12 for Sr-TES-4, [19] respectively. Due to special HEU structure, the synthetic CP after cation-exchange could improve its gas separation ability.…”

Section: Ch 4 /N 2 Adsorption Performances Of the Synthetic Cpcontrasting

confidence: 57%

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

et al. 2021

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The clinoptilolites (CPs) with high purity were prepared via structure directing agent (SDA) method combining with hydrothermal method using silica sol as the silica source and aluminum hydroxide as the aluminum source. Their structural features were characterized by X-ray diffraction (XRD) patterns, Fourier transform infrared (FT-IR) spectra, thermal gravimetric (TG) analysis, scanning electron micrograph (SEM) images, 29 Si nuclear magnetic resonance (NMR) profiles. The effects of additive amount and aging time of used SDA, as well as synthetic parameters such as crystallization temperature and crystallization time on their structure and performance were emphasized. Particularly, the activation energies of their crystallization kinetics at different stages of induction period and growth period were calculated on the basis of Arrhenius equation. The results demonstrated that the obtained CPs presented the highest relative crystallinity when the additive amount of used SDA was 1 mL at aging periods of 2 d, otherwise, their relative crystallinity degree was low due to existences of a large number of heterocrystal impurities. Particularly, the apparent activation energy values for induction (E n) and growth (E g) profile were calculated by the Arrhenius equation. The E n value (86.46 kJ/mol) of induction period was much higher than that E g value (9.64 kJ/mol) of growth stage, suggesting that the induction period was the main controlling step during the synthetic CP. Finally, the synthetic CP was employed to preliminarily assess its performances for CH 4 /N 2 separation. These demonstrations provide a promising method for the synthesis of CPs.

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Section: Ch 4 /N 2 Adsorption Performances Of the Synthetic Cpcontrasting

confidence: 57%

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

et al. 2021

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“…Notably, this selectivity is higher than that of many top‐ranking adsorbents, such as ZK‐5 (~4.2), 20 CGUCs (5.4), 45 OMC (3.7), 46 and MIL‐100(Cr) (3.0) 47 . Furthermore, the high CH 4 /N 2 selectivity and CH 4 adsorption capacity were exhibited simultaneously by granular GOC‐2, as shown in Figure 3d 1,2,17,20,45‐55 . Thus, GOC‐2 sets a benchmark for CH 4 separation and concentration from low‐grade coal‐bed gas.…”

Section: Resultsmentioning

confidence: 83%

“…The binary‐gas separation performance with a CH 4 /N 2 composition of 20:80 (v/v) was also evaluated (Figure S5): The highest CH 4 /N 2 selectivity of 5.6 was also obtained on GOC‐2. Notably, this selectivity is higher than that of many top‐ranking adsorbents, such as ZK‐5 (~4.2), 20 CGUCs (5.4), 45 OMC (3.7), 46 and MIL‐100(Cr) (3.0) 47 . Furthermore, the high CH 4 /N 2 selectivity and CH 4 adsorption capacity were exhibited simultaneously by granular GOC‐2, as shown in Figure 3d 1,2,17,20,45‐55 .…”

Section: Resultsmentioning

confidence: 89%

“…Nevertheless, the long‐term stability and manufacturing cost need to be optimized to realize commercial applications 18,19 . Recently, our group has reported the successful down‐sized zeolite (ZK‐5) prepared via β ‐cyclodextrin mediating: the nano‐sized ZK‐5 (50–100 nm) showed an enhanced CH 4 separation capacity of 1.34 mmol/g and CH 4 /N 2 selectivity (20/80, v/v) of 4.2 at 298 K and 1 bar 20 . However, because of the high polarizability of zeolites, they strongly interact with water vapor, which reduces their effectiveness for CH 4 separation from coal‐bed gas streams 21 …”

Section: Introductionmentioning

confidence: 99%

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Ultramicroporous carbon granules with narrow pore size distribution for efficient CH₄ separation from coal‐bed gases

Dong

Shang

et al. 2021

AIChE Journal

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The adsorptive separation of CH4 from low‐grade coal‐bed gas can be performed at decentralized and remote coal mines, and it uses more energy‐ and is cost‐efficient than the traditional cryogenic distillation process. Herein, we present a facile method to prepare ultramicroporous carbon granules with a narrow pore‐size distribution at 0.5–0.6 nm. To our knowledge, such centered and uniform pore‐size distribution in carbon granules has never been reported. The carbon granules can be directly utilized in adsorption columns without a granulation or pelletization process. The granular oil‐tea‐shell‐derived porous carbon (GOC‐2) exhibited a record‐high CH4 uptake of 1.82 mmol/g and CH4/N2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH4/N2 separation performances were confirmed from the results of dynamic breakthrough experiments and pressure swing adsorption simulations. This work provides a novel strategy for developing ultramicroporous carbon granules and guides the future design of efficient CH4/N2 separation adsorbents.

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“…When excessive Ch + amount is involved in the reactant mixture,t he hydrogen bonding between Ch + and surface hydroxyl groups of FAUn uclei could severely restrict the crystal growth rate,a sr eported recently for KFI zeolite. [39] This explains the relatively smaller crystal sizes found in the high-silica FAUz eolites,t hat is,0 .1-0.7 mmv ersus those of FAU-CH and FAU-CE (1.0-1.7 mm) and commercial FAU zeolite (0.5-1.0 mm). (Figure 3, Figure S23, Table 1).…”

Section: Resultsmentioning

confidence: 95%

A Cooperative OSDA Blueprint for Highly Siliceous Faujasite Zeolite Catalysts with Enhanced Acidity Accessibility

Dusselier

Khalil

et al. 2021

Angewandte Chemie

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Ac ooperative OSDAs trategy is demonstrated, leading to novel high-silica FAUzeolites with alarge potential for disruptive acid catalysis.I nb ottom-up synthesis,t he symbiosis of choline ion (Ch + )a nd 15-crown-5( CE) was evidenced, in af orm of full occupation of the sodalite (sod) cages with the trans Ch + conformer,i nduced by the CE presence.C Ei tself occupied the supercages along with additional gaucheC h + ,b ut in synthesis without CE, no trans was found. The cooperation, and thus the fraction of trans Ch + ,was closely related to the Si/Al ratio,akey measure for FAU stability and acidity.Assuch, abottom-up handle for lowering the Al-content of FAUa nd tuning its acid site distribution is shown.Amechanistic study demonstrated that forming sod cages with trans Ch + is key to the nucleation of high-silica FAU zeolites.T he materials showed superior performances to commercial FAUz eolites and those synthesized without cooperation, in the catalytic degradation of polyethylene.

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Down-sizing the crystal size of ZK-5 zeolite for its enhanced CH4 adsorption and CH4/N2 separation performances

Cited by 46 publications

References 37 publications

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

Ultramicroporous carbon granules with narrow pore size distribution for efficient CH₄ separation from coal‐bed gases

A Cooperative OSDA Blueprint for Highly Siliceous Faujasite Zeolite Catalysts with Enhanced Acidity Accessibility

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Down-sizing the crystal size of ZK-5 zeolite for its enhanced CH4 adsorption and CH4/N2 separation performances

Cited by 46 publications

References 37 publications

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

Ultramicroporous carbon granules with narrow pore size distribution for efficient CH4 separation from coal‐bed gases

A Cooperative OSDA Blueprint for Highly Siliceous Faujasite Zeolite Catalysts with Enhanced Acidity Accessibility

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Ultramicroporous carbon granules with narrow pore size distribution for efficient CH₄ separation from coal‐bed gases