Enhancing CH 4/N 2 Separation Performance within Aluminum-Based Metal-Organic Frameworks: Influence of the Pore Structure and Linker Polarity

2021 ◽  
Author(s):  
Zhenghui Huang ◽  
Peng Hu ◽  
Jia Liu ◽  
Fang Shen ◽  
Youquan Zhang ◽  
...  
Keyword(s):  
Pore Structure ◽  
Metal Organic Frameworks ◽  
Separation Performance ◽  
Metal Organic

The Rise of Metal-Organic Frameworks for Electrolyte Applications

2021 ◽  
Author(s):  
Xia Hu ◽  
Qi Liu ◽  
Kui Lin ◽  
Cuipang Han ◽  
Baohua Li
Keyword(s):  
Chemical Composition ◽  
Pore Structure ◽  
Metal Organic Frameworks ◽  
Surface Functionality ◽  
Metal Organic

Metal−organic frameworks (MOFs) have been attracting a great attention for application in electrolytes. Benefiting from the controllable chemical composition, tunable pore structure and surface functionality, MOFs offer great opportunities for...

scholarly journals Temperature dependence of adsorption hysteresis in flexible metal organic frameworks

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Shamsur Rahman ◽  
Arash Arami-Niya ◽  
Xiaoxian Yang ◽  
Gongkui Xiao ◽  
Gang (Kevin) Li ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Capillary Condensation ◽  
Metal Organic Frameworks ◽  
Sorption Isotherms ◽  
Separation Performance ◽  
Process Simulations ◽  
Metal Organic ◽  
Flexible Metal ◽  
Pressure Swing ◽  
External Stimuli

Abstract“Breathing” and “gating” are striking phenomena exhibited by flexible metal-organic frameworks (MOFs) in which their pore structures transform upon external stimuli. These effects are often associated with eminent steps and hysteresis in sorption isotherms. Despite significant mechanistic studies, the accurate description of stepped isotherms and hysteresis remains a barrier to the promised applications of flexible MOFs in molecular sieving, storage and sensing. Here, we investigate the temperature dependence of structural transformations in three flexible MOFs and present a new isotherm model to consistently analyse the transition pressures and step widths. The transition pressure reduces exponentially with decreasing temperature as does the degree of hysteresis (c.f. capillary condensation). The MOF structural transition enthalpies range from +6 to +31 kJ·mol−1 revealing that the adsorption-triggered transition is entropically driven. Pressure swing adsorption process simulations based on flexible MOFs that utilise the model reveal how isotherm hysteresis can affect separation performance.

scholarly journals Application of CoMn/CoFe layered double hydroxide based on metal-organic frameworks template to activate peroxymonosulfate for 2, 4-dichlorophenol degradation

2021 ◽  
Author(s):  
Chenyu Liu ◽  
Haitong Wei ◽  
Yanhui Gao ◽  
Ning Wang ◽  
Xiaoying Yuan ◽  
...  
Keyword(s):  
Specific Surface ◽  
Pore Structure ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
High Specific Surface Area ◽  
State Transformation ◽  
Alkaline Conditions ◽  
Metal Organic

Abstract Metal-Organic Frameworks (MOFs) have unique properties and stable structure, which have been widely used as templates/precursors to prepare well-developed pore structure and high specific surface area materials. In this article, an innovative and facile method of crystal reorganization was designed by using MOFs as sacrificial templates to prepare LDH nano-layer sheet structure through a pseudomorphic conversion process under alkaline conditions. The obtained CoMn-LDH and CoFe-LDH catalysts broke the ligand of MOFs and reorganized the structure on the basis of retaining a high specific surface area and a large number of pores, which have higher specific surface area and well-developed pore structure than LDH catalysts prepared by traditional methods, and thus provide more active sites to activate PMS. Due to the unique framework structure of MOFs, the MOF derived CoMn-LDH and CoFe-LDH catalysts could provide more active sites to activate PMS, and achieve a 2, 4-dichlorophenol (2, 4-DCP) degradation of 99.3% and 99.2% within 20 min, respectively. Besides, the two LDH catalysts displayed excellent degradation performance for bisphenol A (BPA), ciprofloxacin (CIP) and 2, 4-dichlorophenoxyacetic acid (2, 4-D). XPS indicated that the valence state transformation of metal elements participated in PMS activation. EPR manifested sulfate radical () and singlet oxygen (1O2) were the main species for degrading pollutants. In addition, after the three-cycle experiment, the CoMn-LDH and CoFe-LDH catalysts also showed long-term stability with a slight activity decrease in the third cycle. The phytotoxicity assessment determined by the germination of mung beans proved that PMS activation by MOFs-derived LDH catalyst can basically eliminate the phytotoxicity of 2, 4-D solution. This research not only developed high-activity LDH catalysts for PMS activation, but also expanded the environmental applications of MOFs derivants.

scholarly journals Pore environment engineering in metal–organic frameworks for efficient ethane/ethylene separation

2019 ◽  
Vol 7 (22) ◽  
pp. 13585-13590 ◽  
Author(s):  
Xun Wang ◽  
Zheng Niu ◽  
Abdullah M. Al-Enizi ◽  
Ayman Nafady ◽  
Yufang Wu ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Methyl Groups ◽  
Separation Performance ◽  
Metal Organic ◽  
Organic Framework

Methyl groups are introduced on the pore walls of a metal–organic framework to enhance the separation performance of C2H6/C2H4.

Monte Carlo Simulations to Examine the Role of Pore Structure on Ambient Air Separation in Metal–Organic Frameworks

2018 ◽  
Vol 57 (28) ◽  
pp. 9240-9253 ◽  
Author(s):  
Sean M. McIntyre ◽  
Bohan Shan ◽  
Ruitong Wang ◽  
Congwei Zhong ◽  
Jichang Liu ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Pore Structure ◽  
Metal Organic Frameworks ◽  
Ambient Air ◽  
Air Separation ◽  
Metal Organic

Mesoporous Metal-Organic Frameworks with Size-, Shape-, and Space-Distribution-Controlled Pore Structure

2015 ◽  
Vol 27 (18) ◽  
pp. 2923-2929 ◽  
Author(s):  
Weina Zhang ◽  
Yayuan Liu ◽  
Guang Lu ◽  
Yong Wang ◽  
Shaozhou Li ◽  
...  
Keyword(s):  
Pore Structure ◽  
Metal Organic Frameworks ◽  
Space Distribution ◽  
Metal Organic ◽  
Mesoporous Metal
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