共查询到20条相似文献,搜索用时 219 毫秒
1.
Dr. Shimin Chen Yan Ju Dr. Hao Zhang Yingbing Zou Si Lin Yunbin Li Shuaiqi Wang Prof. En Ma Dr. Weihua Deng Prof. Shengchang Xiang Prof. Banglin Chen Prof. Zhangjing Zhang 《Angewandte Chemie (International ed. in English)》2023,62(34):e202308418
Rational design of crystalline porous materials with coupled proton-electron transfer has not yet been reported to date. Herein, we report a donor-acceptor (D-A) π-π stacking hydrogen-bonded organic framework (HOF; HOF-FJU-36 ) with zwitterionic 1,1′-bis(3-carboxybenzyl)-4,4′-bipyridinium (H2L2+) as acceptor and 2,7-naphthalene disulfonate (NDS2−) as donor to form a two-dimensional (2D) layer. Three water molecules were situated in the channels to connect with acidic species through hydrogen bonding interactions to give a 3D framework. The continuous π-π interactions along the a axis and the smooth H-bonding chain along the b axis provide the electron and proton transfer pathways, respectively. After 405 nm light irradiation, the photogenerated radicals could simultaneously endow HOF-FJU-36 with photoswitchable electron and proton conductivity due to coupled electron-proton transfer. By single-crystal X-ray diffraction (SCXRD) analyses, X-ray photoelectron spectroscopy (XPS), transient absorption spectra and density functional theory (DFT) calculations, the mechanism of the switchable conductivity upon irradiation has been demonstrated. 相似文献
2.
Qiao Liu Sung Gu Cho Jordon Hilliard Ting-Yuan Wang Prof. Szu-Chia Chien Prof. Li-Chiang Lin Prof. Anne C. Co Prof. Casey R. Wade 《Angewandte Chemie (International ed. in English)》2023,62(18):e202218854
Although many porous materials, including metal–organic frameworks (MOFs), have been reported to selectively adsorb C2H2 in C2H2/CO2 separation processes, CO2-selective sorbents are much less common. Here, we report the remarkable performance of MFU-4 (Zn5Cl4(bbta)3, bbta=benzo-1,2,4,5-bistriazolate) toward inverse CO2/C2H2 separation. The MOF facilitates kinetic separation of CO2 from C2H2, enabling the generation of high purity C2H2 (>98 %) with good productivity in dynamic breakthrough experiments. Adsorption kinetics measurements and computational studies show C2H2 is excluded from MFU-4 by narrow pore windows formed by Zn−Cl groups. Postsynthetic F−/Cl− ligand exchange was used to synthesize an analogue ( MFU-4-F ) with expanded pore apertures, resulting in equilibrium C2H2/CO2 separation with reversed selectivity compared to MFU-4 . MFU-4-F also exhibits a remarkably high C2H2 adsorption capacity (6.7 mmol g−1), allowing fuel grade C2H2 (98 % purity) to be harvested from C2H2/CO2 mixtures by room temperature desorption. 相似文献
3.
Dr. Fahui Xiang Hao Zhang Dr. Yisi Yang Lu Li Zhenni Que Liangji Chen Zhen Yuan Shimin Chen Zizhu Yao Prof. Jianwei Fu Prof. Shengchang Xiang Prof. Banglin Chen Prof. Zhangjing Zhang 《Angewandte Chemie (International ed. in English)》2023,62(13):e202300638
Rational design of high nuclear copper cluster-based metal–organic frameworks has not been established yet. Herein, we report a novel MOF ( FJU-112 ) with the ten-connected tetranuclear copper cluster [Cu4(PO3)2(μ2-H2O)2(CO2)4] as the node which was capped by the deprotonated organic ligand of H4L (3,5-Dicarboxyphenylphosphonic acid). With BPE (1,2-Bis(4-pyridyl)ethane) as the pore partitioner, the pore spaces in the structure of FJU-112 were divided into several smaller cages and smaller windows for efficient gas adsorption and separation. FJU-112 exhibits a high separation performance for the C2H2/CO2 separation, which were established by the temperature-dependent sorption isotherms and further confirmed by the lab-scale dynamic breakthrough experiments. The grand canonical Monte Carlo simulations (GCMC) studies show that its high C2H2/CO2 separation performance is contributed to the strong π-complexation interactions between the C2H2 molecules and framework pore surfaces, leading to its more C2H2 uptakes over CO2 molecules. 相似文献
4.
Yan-Xi Tan Jing Lin Prof. Qiao-Hong Li Liqiong Li Rahul Anil Borse Prof. Weigang Lu Prof. Yaobing Wang Prof. Daqiang Yuan 《Angewandte Chemie (International ed. in English)》2023,62(22):e202302882
Designing porous materials for C2H2 purification and safe storage is essential research for industrial utilization. We emphatically regulate the metal-alkyne interaction of PdII and PtII on C2H2 sorption and C2H2/CO2 separation in two isostructural NbO metal–organic frameworks (MOFs), Pd/Cu-PDA and Pt/Cu-PDA . The experimental investigations and systematic theoretical calculations reveal that PdII in Pd/Cu-PDA undergoes spontaneous chemical reaction with C2H2, leading to irreversible structural collapse and loss of C2H2/CO2 sorption and separation. Contrarily, PtII in Pt/Cu-PDA shows strong di-σ bond interaction with C2H2 to form specific π-complexation, contributing to high C2H2 capture (28.7 cm3 g−1 at 0.01 bar and 153 cm3 g−1 at 1 bar). The reusable Pt/Cu-PDA efficiently separates C2H2 from C2H2/CO2 mixtures with satisfying selectivity and C2H2 capacity (37 min g−1). This research provides valuable insight into designing high-performance MOFs for gas sorption and separation. 相似文献
5.
Dr. Yingxiang Ye Yi Xie Dr. Yanshu Shi Dr. Lingshan Gong Dr. Joshua Phipps Prof. Abdullah M. Al-Enizi Prof. Ayman Nafady Prof. Banglin Chen Prof. Shengqian Ma 《Angewandte Chemie (International ed. in English)》2023,62(21):e202302564
Developing adsorptive separation processes based on C2H6-selective sorbents to replace energy-intensive cryogenic distillation is a promising alternative for C2H4 purification from C2H4/C2H6 mixtures, which however remains challenging. During our studies on two isostructural metal–organic frameworks ( Ni-MOF 1 and Ni-MOF 2 ), we found that Ni-MOF 2 exhibited significantly higher performance for C2H6/C2H4 separation than Ni-MOF-1 , as clearly established by gas sorption isotherms and breakthrough experiments. Density-Functional Theory (DFT) studies showed that the unblocked unique aromatic pore surfaces within Ni-MOF 2 induce more and stronger C−H⋅⋅⋅π with C2H6 over C2H4 while the suitable pore spaces enforce its high C2H6 uptake capacity, featuring Ni-MOF 2 as one of the best porous materials for this very important gas separation. It generates 12 L kg−1 of polymer-grade C2H4 product from equimolar C2H6/C2H4 mixtures at ambient conditions. 相似文献
6.
Dr. Zhibin Cheng Yanlong Fang Dr. Yisi Yang Dr. Hao Zhang Zhiwen Fan Dr. Jindan Zhang Prof. Shengchang Xiang Prof. Banglin Chen Prof. Zhangjing Zhang 《Angewandte Chemie (International ed. in English)》2023,62(45):e202311480
Elaborately designed multifunctional electrocatalysts capable of promoting Li+ and CO2 transport are essential for upgrading the cycling stability and rate capability of Li-CO2 batteries. Hydrogen-bonded organic frameworks (HOFs) with open channels and easily functionalized surfaces hold great potential for applications in efficient cathodes of Li-CO2 batteries. Herein, a robust HOFS (HOF-FJU-1) is introduced for the first time as a co-catalyst in the cathode material of Li-CO2 batteries. HOF-FJU-1 with cyano groups located periodically in the pore can induce homogeneous deposition of discharge products and accommodate volumetric expansion of discharge products during cycling. Besides, HOF-FJU-1 enables effective interaction between Ru0 nanoparticles and cyano groups, thus forming efficient and uniform catalytic sites for CRR/CER. Moreover, HOF-FJU-1 with regularly arranged open channels are beneficial for CO2 and Li+ transport, enabling rapid redox kinetic conversion of CO2. Therefore, the HOF-based Li-CO2 batteries are capable of stable operation at 400 mA g−1 for 1800 h and maintain a low overpotential of 1.96 V even at high current densities up to 5 A g−1. This work provides valuable guidance for developing multifunctional HOF-based catalysts to upgrade the longevity and rate capability of Li-CO2 batteries. 相似文献
7.
Jiali Huang Yunbin Li Hao Zhang Zhen Yuan Prof. Shengchang Xiang Prof. Banglin Chen Prof. Zhangjing Zhang 《Angewandte Chemie (International ed. in English)》2023,62(52):e202315987
Hydrogen-bonded organic frameworks (HOFs) have been emerging as a new type of very promising microporous materials for gas separation and purification, but few HOFs structures constructed through hydrogen-bonding tetramers have been explored in this field. Herein, we report the first microporous HOF (termed as HOF-FJU-46) afforded by hydrogen-bonding tetramers with 4-fold interpenetrated diamond networks, which shows excellent chemical and thermal stability. What's more, activated HOF-FJU-46 exhibits the highest xenon (Xe) uptake of 2.51 mmol g−1 and xenon/krypton (Kr) selectivity of 19.9 at the ambient condition among the reported HOFs up to date. Dynamic breakthrough tests confirmed the excellent Xe/Kr separation of HOF-FJU-46a, showing high Kr productivity (110 mL g−1) and Xe uptake (1.29 mmol g−1), as well as good recyclability. The single crystal X-ray diffraction and the molecular simulations revealed that the abundant accessible aromatic and pyrazole rings in the pore channels of HOF-FJU-46a can provide the multiple strong C−H⋅⋅⋅Xe interactions with Xe atoms. 相似文献
8.
Lingchang Jiang Dr. Pengyuan Wang Meiping Li Panpan Zhang Dr. Jialu Li Jia Liu Dr. Yanhang Ma Dr. Hao Ren Prof. Dr. Guangshan Zhu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(38):9045-9051
Utilization of porous materials for gas capture and separation is a hot research topic. Removal of acetylene (C2H2) from ethylene (C2H4) is important in the oil refining and petrochemical industries, since C2H2 impurities deactivate the catalysts and terminate the polymerization of C2H4. Carbon dioxide (CO2) emission from power plants contributes to global climate change and threatens the survival of life on this planet. Herein, 2D crystalline polyimide porous organic framework PAF-120, which was constructed by imidization of linear naphthalene-1,4,5,8-tetracarboxylic dianhydride and triangular 1,3,5-tris(4-aminophenyl)benzene, showed significant thermal and chemical stability. Low-pressure gas adsorption isotherms revealed that PAF-120 exhibits good selective adsorption of C2H2 over C2H4 and CO2 over N2. At 298 K and 1 bar, its C2H2 and CO2 selectivities were predicted to be 4.1 and 68.7, respectively. More importantly, PAF-120 exhibits the highest selectivity for C2H2/C2H4 separation among porous organic frameworks. Thus PAF-120 could be a suitable candidate for selective separation of C2H2 over C2H4 and CO2 over N2. 相似文献
9.
Wansheng Liu Shubo Geng Ning Li Sa Wang Shuping Jia Fazheng Jin Ting Wang Katherine A. Forrest Prof. Tony Pham Prof. Peng Cheng Prof. Yao Chen Prof. Jian-Gong Ma Prof. Zhenjie Zhang 《Angewandte Chemie (International ed. in English)》2023,62(8):e202217662
Two C2H6-selective metal-organic framework (MOF) adsorbents with ultrahigh stability, high surface areas, and suitable pore size have been designed and synthesized for one-step separation of ethane/ethylene (C2H6/C2H4) under humid conditions to produce polymer-grade pure C2H4. Experimental results reveal that these two MOFs not only adsorb a high amount of C2H6 but also display good C2H6/C2H4 selectivity verified by fixed bed column breakthrough experiments. Most importantly, the good water stability and hydrophobic pore environments make these two MOFs capable of efficiently separating C2H6/C2H4 under humid conditions, exhibiting the benchmark performance among all reported adsorbents for separation of C2H6/C2H4 under humid conditions. Moreover, the affinity sites and their static adsorption energies were successfully revealed by single crystal data and computation studies. Adsorbents described in this work can be used to address major chemical industrial challenges. 相似文献
10.
Shubo Geng Hang Xu Chun-Shuai Cao Prof. Tony Pham Prof. Bin Zhao Prof. Zhenjie Zhang 《Angewandte Chemie (International ed. in English)》2023,62(32):e202305390
Adsorption-based removal of carbon dioxide (CO2) from gas mixtures has demonstrated great potential for solving energy security and environmental sustainability challenges. However, due to similar physicochemical properties between CO2 and other gases as well as the co-adsorption behavior, the selectivity of CO2 is severely limited in currently reported CO2-selective sorbents. To address the challenge, we create a bioinspired design strategy and report a robust, microporous metal–organic framework (MOF) with unprecedented [Mn86] nanocages. Attributed to the existence of unique enzyme-like confined pockets, strong coordination interactions and dipole-dipole interactions are generated for CO2 molecules, resulting in only CO2 molecules fitting in the pocket while other gas molecules are prohibited. Thus, this MOF can selectively remove CO2 from various gas mixtures and show record-high selectivities of CO2/CH4 and CO2/N2 mixtures. Highly efficient CO2/C2H2, CO2/CH4, and CO2/N2 separations are achieved, as verified by experimental breakthrough tests. This work paves a new avenue for the fabrication of adsorbents with high CO2 selectivity and provides important guidance for designing highly effective adsorbents for gas separation. 相似文献
11.
Yong‐Peng Li Ying Wang Ying‐Ying Xue Hai‐Peng Li Quan‐Guo Zhai Shu‐Ni Li Yu‐Cheng Jiang Man‐Cheng Hu Xianhui Bu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(38):13724-13729
A strategy called ultramicroporous building unit (UBU) is introduced. It allows the creation of hierarchical bi‐porous features that work in tandem to enhance gas uptake capacity and separation. Smaller pores from UBUs promote selectivity, while larger inter‐UBU packing pores increase uptake capacity. The effectiveness of this UBU strategy is shown with a cobalt MOF (denoted SNNU‐45) in which octahedral cages with 4.5 Å pore size serve as UBUs. The C2H2 uptake capacity at 1 atm reaches 193.0 cm3 g?1 (8.6 mmol g?1) at 273 K and 134.0 cm3 g?1 (6.0 mmol g?1) at 298 K. Such high uptake capacity is accompanied by a high C2H2/CO2 selectivity of up to 8.5 at 298 K. Dynamic breakthrough studies at room temperature and 1 atm show a C2H2/CO2 breakthrough time up to 79 min g?1, among top‐performing MOFs. Grand canonical Monte Carlo simulations agree that ultrahigh C2H2/CO2 selectivity is mainly from UBU ultramicropores, while packing pores promote C2H2 uptake capacity. 相似文献
12.
Junkuo Gao Xuefeng Qian Rui‐Biao Lin Rajamani Krishna Hui Wu Wei Zhou Banglin Chen 《Angewandte Chemie (International ed. in English)》2020,59(11):4396-4400
The separation of C2H2/CO2 is particularly challenging owing to their similarities in physical properties and molecular sizes. Reported here is a mixed metal–organic framework (M′MOF), [Fe(pyz)Ni(CN)4] ( FeNi‐M′MOF , pyz=pyrazine), with multiple functional sites and compact one‐dimensional channels of about 4.0 Å for C2H2/CO2 separation. This MOF shows not only a remarkable volumetric C2H2 uptake of 133 cm3 cm?3, but also an excellent C2H2/CO2 selectivity of 24 under ambient conditions, resulting in the second highest C2H2‐capture amount of 4.54 mol L?1, thus outperforming most previous benchmark materials. The separation performance of this material is driven by π–π stacking and multiple intermolecular interactions between C2H2 molecules and the binding sites of FeNi‐M′MOF . This material can be facilely synthesized at room temperature and is water stable, highlighting FeNi‐M′MOF as a promising material for C2H2/CO2 separation. 相似文献
13.
Prof. Junkuo Gao Xuefeng Qian Dr. Rui-Biao Lin Dr. Rajamani Krishna Dr. Hui Wu Dr. Wei Zhou Prof. Banglin Chen 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(11):4426-4430
The separation of C2H2/CO2 is particularly challenging owing to their similarities in physical properties and molecular sizes. Reported here is a mixed metal–organic framework (M′MOF), [Fe(pyz)Ni(CN)4] ( FeNi-M′MOF , pyz=pyrazine), with multiple functional sites and compact one-dimensional channels of about 4.0 Å for C2H2/CO2 separation. This MOF shows not only a remarkable volumetric C2H2 uptake of 133 cm3 cm−3, but also an excellent C2H2/CO2 selectivity of 24 under ambient conditions, resulting in the second highest C2H2-capture amount of 4.54 mol L−1, thus outperforming most previous benchmark materials. The separation performance of this material is driven by π–π stacking and multiple intermolecular interactions between C2H2 molecules and the binding sites of FeNi-M′MOF . This material can be facilely synthesized at room temperature and is water stable, highlighting FeNi-M′MOF as a promising material for C2H2/CO2 separation. 相似文献
14.
An anionic multifunctional porous metal organic framework (MOF), [Cu2THBA(H2O)2] · (C3H7NO)12 · (H2O)10 ( 1 ) (H4THBA = p‐terphenyl‐3,2′′,3′′,5,5′′,5′′′‐ hexcarboxylic acid) with NbO‐type topology was synthesized and characterized. Due to multiple functional sites and suitable pore size, the desolvated compound 1a exhibits high separation selectivity for C2H2/CO2 of 30 and C2H2/CH4 of 131 at 1 kPa at room temperature. Compound 1 can also efficiently and completely separate methylene blue (MB+) molecules of low concentrations from aqueous solution in 12 h. 相似文献
15.
Yuanbin Zhang Jianbo Hu Rajamani Krishna Lingyao Wang Lifeng Yang Xili Cui Simon Duttwyler Huabin Xing 《Angewandte Chemie (International ed. in English)》2020,59(40):17664-17669
Separation of acetylene (C2H2) from carbon dioxide (CO2) or ethylene (C2H4) is important in industry but limited by the low capacity and selectivity owing to their similar molecular sizes and physical properties. Herein, we report two novel dodecaborate‐hybrid metal–organic frameworks, MB12H12(dpb)2 (termed as BSF‐3 and BSF‐3‐Co for M=Cu and Co), for highly selective capture of C2H2. The high C2H2 capacity and remarkable C2H2/CO2 selectivity resulted from the unique anionic boron cluster functionality as well as the suitable pore size with cooperative proton‐hydride dihydrogen bonding sites (B?Hδ????Hδ+?C≡C?Hδ+???Hδ??B). This new type of C2H2‐specific functional sites represents a fresh paradigm distinct from those in previous leading materials based on open metal sites, strong electrostatics, or hydrogen bonding. 相似文献
16.
Fangzhou Li Dr. Errui Li Dr. Krishanu Samanta Zhaoxi Zheng Dr. Lianqian Wu Albert D. Chen Prof. Dr. Omar K. Farha Dr. Richard J. Staples Prof. Dr. Jia Niu Prof. Dr. Klaus Schmidt-Rohr Prof. Dr. Chenfeng Ke 《Angewandte Chemie (International ed. in English)》2023,62(50):e202311601
Boron trifluoride (BF3) is a highly corrosive gas widely used in industry. Confining BF3 in porous materials ensures safe and convenient handling and prevents its degradation. Hence, it is highly desired to develop porous materials with high adsorption capacity, high stability, and resistance to BF3 corrosion. Herein, we designed and synthesized a Lewis basic single-crystalline hydrogen-bond crosslinked organic framework (HCOF-50) for BF3 storage and its application in catalysis. Specifically, we introduced self-complementary ortho-alkoxy-benzamide hydrogen-bonding moieties to direct the formation of highly organized hydrogen-bonded networks, which were subsequently photo-crosslinked to generate HCOFs. The HCOF-50 features Lewis basic thioether linkages and electron-rich pore surfaces for BF3 uptake. As a result, HCOF-50 shows a record-high 14.2 mmol/g BF3 uptake capacity. The BF3 uptake in HCOF-50 is reversible, leading to the slow release of BF3. We leveraged this property to reduce the undesirable chain transfer and termination in the cationic polymerization of vinyl ethers. Polymers with higher molecular weights and lower polydispersity were generated compared to those synthesized using BF3 ⋅ Et2O. The elucidation of the structure–property relationship, as provided by the single-crystal X-ray structures, combined with the high BF3 uptake capacity and controlled sorption, highlights the molecular understanding of framework-guest interactions in addressing contemporary challenges. 相似文献
17.
A Porphyrin‐Based Porous rtl Metal–Organic Framework as an Efficient Catalyst for the Cycloaddition of CO2 to Epoxides 下载免费PDF全文
Dr. Wei Jiang Prof. Jin Yang Dr. Ying‐Ying Liu Dr. Shu‐Yan Song Prof. Jian‐Fang Ma 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(47):16991-16997
A porous rtl metal–organic framework (MOF) [Mn5L(H2O)6?(DMA)2]?5DMA?4C2H5OH ( 1? Mn) (H10L=5,10,15,20‐tetra(4‐(3,5‐dicarboxylphenoxy)phenyl)porphyrin; DMA=N,N′‐dimethylacetamide) was synthesized by employing a new porphyrin‐based octacarboxylic acid ligand. 1? Mn exhibits high MnII density in the porous framework, providing it great Lewis‐acid heterogeneous catalytic capability for the cycloaddition of CO2 with epoxides. Strikingly, 1? Mn features excellent catalytic activity to the cycloaddition of CO2 to epoxides, with a remarkable initial turnover frequency 400 per mole of catalyst per hour at 20 atm. As‐synthesized 1? Mn also exhibits size selectivity to different epoxide substrates on account of their steric hindrance. The high catalytic activity, size selectivity, and stability toward the epoxides on catalytic cycloaddition of CO2 make 1? Mn a promising heterogeneous catalyst for fixation and utilization of CO2. 相似文献
18.
Hongling Song Dr. Yuan Peng Chenlu Wang Dr. Lun Shu Chenyu Zhu Dr. Yanlei Wang Prof. Hongyan He Prof. Weishen Yang 《Angewandte Chemie (International ed. in English)》2023,62(17):e202218472
High-purity H2 production accompanied with a precise decarbonization opens an avenue to approach a carbon-neutral society. Metal–organic framework nanosheet membranes provide great opportunities for an accurate and fast H2/CO2 separation, CO2 leakage through the membrane interlayer galleries decided the ultimate separation accuracy. Here we introduce low dose amino side groups into the Zn2(benzimidazolate)4 conformation. Physisorbed CO2 served as interlayer linkers, gently regulated and stabilized the interlayer spacing. These evoked a synergistic effect of CO2 adsorption-assisted molecular sieving and steric hinderance, whilst exquisitely preserving apertures for high-speed H2 transport. The optimized amino membranes set a new record for ultrathin nanosheet membranes in H2/CO2 separation (mixture separation factor: 1158, H2 permeance: 1417 gas permeation unit). This strategy provides an effective way to customize ultrathin nanosheet membranes with desirable molecular sieving ability. 相似文献
19.
Prof. Yuanbin Zhang Wanqi Sun Prof. Binquan Luan Jiahao Li Dr. Dong Luo Yunjia Jiang Dr. Lingyao Wang Prof. Banglin Chen 《Angewandte Chemie (International ed. in English)》2023,62(37):e202309925
Separation of acetylene (C2H2) from carbon dioxide (CO2) or ethylene (C2H4) is industrially important but still challenging so far. Herein, we developed two novel robust metal organic frameworks AlFSIX-Cu-TPBDA (ZNU-8) with znv topology and SIFSIX-Cu-TPBDA (ZNU-9) with wly topology for efficient capture of C2H2 from CO2 and C2H4. Both ZNU-8 and ZNU-9 feature multiple anion functionalities and hierarchical porosity. Notably, ZNU-9 with more anionic binding sites and three distinct cages displays both an extremely large C2H2 capacity (7.94 mmol/g) and a high C2H2/CO2 (10.3) or C2H2/C2H4 (11.6) selectivity. The calculated capacity of C2H2 per anion (4.94 mol/mol at 1 bar) is the highest among all the anion pillared metal organic frameworks. Theoretical calculation indicated that the strong cooperative hydrogen bonds exist between acetylene and the pillared SiF62− anions in the confined cavity, which is further confirmed by in situ IR spectra. The practical separation performance was explicitly demonstrated by dynamic breakthrough experiments with equimolar C2H2/CO2 mixtures and 1/99 C2H2/C2H4 mixtures under various conditions with excellent recyclability and benchmark productivity of pure C2H2 (5.13 mmol/g) or C2H4 (48.57 mmol/g). 相似文献
20.
Soumya Mukherjee Shoushun Chen Andrey A. Bezrukov Matthew Mostrom Victor V. Terskikh Douglas Franz Shi‐Qiang Wang Amrit Kumar Mansheng Chen Brian Space Yining Huang Michael J. Zaworotko 《Angewandte Chemie (International ed. in English)》2020,59(37):16188-16194
The high energy footprint of commodity gas purification and increasing demand for gases require new approaches to gas separation. Kinetic separation of gas mixtures through molecular sieving can enable separation by molecular size or shape exclusion. Physisorbents must exhibit the right pore diameter to enable separation, but the 0.3–0.4 nm range relevant to small gas molecules is hard to control. Herein, dehydration of the ultramicroporous metal–organic framework Ca‐trimesate, Ca(HBTC)?H2O (H3BTC=trimesic acid), bnn‐1‐Ca‐H2O, affords a narrow pore variant, Ca(HBTC), bnn‐1‐Ca. Whereas bnn‐1‐Ca‐H2O (pore diameter 0.34 nm) exhibits ultra‐high CO2/N2, CO2/CH4, and C2H2/C2H4 binary selectivity, bnn‐1‐Ca (pore diameter 0.31 nm) offers ideal selectivity for H2/CO2 and H2/N2 under cryogenic conditions. Ca‐trimesate, the first physisorbent to exhibit H2 sieving under cryogenic conditions, could be a prototype for a general approach to exert precise control over pore diameter in physisorbents. 相似文献