Selective capture and separation of xenon and krypton using metal organic frameworks: a review

Abstract

Xenon and krypton are widespread useful noble gases in commercial lighting, lasers, electronics, and medical industry. At the same time, radioactive noble gases may proliferate from used nuclear fuel and diffuse in open atmospheres. Metal organic frameworks as hotspot porous materials for gases uptake and separation are considered to be potential solutions. In this review, we comprehensively summarized recent researches on metal organic frameworks for selective capture and separation of xenon and krypton. Particularly, we followed the aspects of different optimal design strategies, including optimal pore/cage size and geometry, open metal sites, ions (anions and cations), and polar functional groups for enhancing the xenon adsorption and separation performances. Meanwhile, a comparison of each strategy and the mechanisms of xenon/krypton separation were pointed out. The separation of krypton from gases mixtures by dual-bed systems was further discussed. Finally, some existing challenges and opportunities for possible real applications were proclaimed.

Key words： metal organic frameworks; xenon; krypton; selective separation; used nuclear fuel

Competing interests

The authors declare that they have no competing interests.

Acknowledgements

We gratefully acknowledge funding support from the National Science Foundation of China (Grants Nos. 22276054, U2167218, and 22006036) and the Beijing Outstanding Young Scientist Program.

References

1 Banerjee D, Cairns A J, Liu J, Motkuri R K, Nune S K, Fernandez C A, Krishna R, Strachan D M, Thallapally P K. Potential of metal-organic frameworks for separation of xenon and krypton. Accounts of Chemical Research, 2015, 48(2): 211–219

2 Basu C, Meinhardt-Wollweber M, Roth B. Lighting with laser diodes. Advances in Optical Technologies, 2013, 2(4): 313–321

3 Grigor’ev G Y, Nabiev S S. Production and applications of spin-polarized isotopes of noble gases. Russian Journal of Physical Chemistry B. Focus on Physics, 2018, 12(3): 363–377

4 Yin H, Chen Z, Zhao H, Huang H, Liu W. Noble gas and neuroprotection: from bench to bedside. Frontiers in Pharmacology, 2022, 13: 1028688

5 Banerjee D, Simon C M, Elsaidi S K, Haranczyk M, Thallapally P K. Xenon gas separation and storage using metal-organic frameworks. Chem, 2018, 4(3): 466–494

6 Back H, Bottenus D, Clayton C, Stephenson D, TeGrotenhuis W. ¹³⁶Xe enrichment through cryogenic distillation. Journal of Instrumentation: an IOP and SISSA Journal, 2017, 12(9): P09033

7 Hasanzadeh A, Azamat J, Pakdel S, Erfan-Niya H, Khataee A. Separation of noble gases using CHA-type zeolite membrane: insights from molecular dynamics simulation. Chemical Papers, 2020, 74(9): 3057–3065

8 Hye Kwon Y, Kiang C, Benjamin E, Crawford P, Nair S, Bhave R. Krypton-xenon separation properties of SAPO-34 zeolite materials and membranes. American Institute of Chemical Engineers Journals, 2017, 63(2): 761–769

9 Wang X, Zhang Y, Wang X, Andres-Garcia E, Du P, Giordano L, Wang L, Hong Z, Gu X, Murad S, Kapteijn F. Xenon recovery by DD3R zeolite membranes: application in anaesthetics. Angewandte Chemie International Edition, 2019, 58(43): 15518–15525

10 Magomedbekov E P, Merkushkin A O, Obruchikov A V, Pokalchuk V S. Argon, krypton and xenon adsorption coefficients on various activated carbons under dynamic conditions. Journal of Radioanalytical and Nuclear Chemistry, 2022, 331(2): 1091–1100

11 Men’shchikov I, Shkolin A, Khozina E, Fomkin A. Peculiarities of thermodynamic behaviors of xenon adsorption on the activated carbon prepared from silicon carbide. Nanomaterials, 2021, 11(4): 971

12 Nakano Y, Ichimura K, Ito H, Okada T, Sekiya H, Takeuchi Y, Tasaka S, Yamashita M. Evaluation of radon adsorption efficiency values in xenon with activated carbon fibers. Progress of Theoretical and Experimental Physics, 2020, 2020(11): 113H01

13 Li H, Eddaoudi M, O’Keeffe M, Yaghi O M. Design and synthesis of an exceptionally stable and highly porous metal-organic framework. Nature, 1999, 402(6759): 276–279

14 Ahmad A, Khan S, Tariq S, Luque R, Verpoort F. Self-sacrifice MOFs for heterogeneous catalysis: synthesis mechanisms and future perspectives. Materials Today, 2022, 55: 137–169

15 Le M, Ni Q L, Zeng L H, Yuan C Y, Wang X J, Li S M, Gui L C. Construction of acylamide-functionalized MOFs for efficient catalysis on the conversion of CO₂. Molecular Catalysis, 2022, 533: 112786

16 Liu H, Xu Y, Li L, Dai X. Deciphering the underlying mechanism of MOF-808-based abiotic catalysis enhancing biodegradability of waste activated sludge: insights from the effects on bioconversion of extracellular organic substances into methane. Science of the Total Environment, 2022, 849: 157855

17 Peng X, Chen L, Li Y. Ordered macroporous MOF-based materials for catalysis. Molecular Catalysis, 2022, 529: 112568

18 Ghanbari T, Abnisa F, Wan Daud W M A. A review on production of metal organic frameworks (MOF) for CO₂ adsorption. Science of the Total Environment, 2020, 707: 135090

19 Li W, Ji W, Yılmaz M, Zhang T C, Yuan S. One-pot synthesis of MWCNTs/Fe-MOFs nanocomposites for enhanced adsorption of As(V) in aqueous solution. Applied Surface Science, 2023, 609: 155304

20 Peh S B, Farooq S, Zhao D. Techno-economic analysis of MOF-based adsorption cycles for postcombustion CO₂ capture from wet flue gas. Chemical Engineering Science, 2023, 268: 118390

21 Rupam T H, Tuli F J, Jahan I, Palash M L, Chakraborty A, Saha B B. Isotherms and kinetics of water sorption onto MOFs for adsorption cooling applications. Thermal Science and Engineering Progress, 2022, 34: 101436

22 Tan T L, Somat H A, Latif M A M, Rashid S A. One-pot solvothermal synthesis of Zr-based MOFs with enhanced adsorption capacity for Cu²⁺ ions removal. Journal of Solid State Chemistry, 2022, 315: 123429

23 Chen C X, Pham T, Tan K, Krishna R, Lan P C, Wang L, Chen S, Al-Enizi A M, Nafady A, Forrest K A, Wang H, Wang S, Shan C, Zhang L, Su C Y, Ma S. Regulating C₂H₂/CO₂ adsorption selectivity by electronic-state manipulation of iron in metal-organic frameworks. Cell Reports Physical Science, 2022, 3(8): 100977

24 Knebel A, Caro J. Metal-organic frameworks and covalent organic frameworks as disruptive membrane materials for energy-efficient gas separation. Nature Nanotechnology, 2022, 17(9): 911–923

25 Cao H, Gou M, Wang C, Guo R. Constructing solubility-diffusion domain in pebax by hybrid-phase MOFs for efficient separation of carbon dioxide and methane. Microporous and Mesoporous Materials, 2022, 346: 112328

26 Wu W, Hong X, Fan J, Wei Y, Wang H. Research progress on the substrate for metal-organic framework (MOF) membrane growth for separation. Chinese Journal of Chemical Engineering, 2022, 56: 299–313

27 Ye Q, Li J, Huang Y, Wu H, Li Y, Yan B. Preparation of a cyclodextrin metal-organic framework (CD-MOF) membrane for chiral separation. Journal of Environmental Chemical Engineering, 2023, 11(2): 109250

28 Ahmed A, Siegel D J. Predicting hydrogen storage in MOFs via machine learning. Patterns, 2021, 2(7): 100291

29 Elsabawy K M, Fallatah A M, Owidah Z O. Synthesis of newly crystalline-porous-Pd(II)-(E,E)-2,4-hexadienoic acid complex-leads to 3D-MOFs for hydrogen storage. Journal of Molecular Structure, 2022, 1250: 131723

30 Gao H, Shi R, Shao Y, Liu Y, Zhu Y, Zhang J, Li L. Catalysis derived from flower-like Ni MOF towards the hydrogen storage performance of magnesium hydride. International Journal of Hydrogen Energy, 2022, 47(15): 9346–9356

31 Jia T, Gu Y, Li F. Progress and potential of metal-organic frameworks (MOFs) for gas storage and separation: a review. Journal of Environmental Chemical Engineering, 2022, 10(5): 108300

32 Yuan G, Tu H, Li M, Liu J, Zhao C, Liao J, Yang Y, Yang J, Liu N. Glycine derivative-functionalized metal-organic framework (MOF) materials for Co(II) removal from aqueous solution. Applied Surface Science, 2019, 466: 903–910

33 Wang T, Lin E, Peng Y L, Chen Y, Cheng P, Zhang Z. Rational design and synthesis of ultramicroporous metal-organic frameworks for gas separation. Coordination Chemistry Reviews, 2020, 423: 213485

34 Banerjee D, Simon C M, Plonka A M, Motkuri R K, Liu J, Chen X, Smit B, Parise J B, Haranczyk M, Thallapally P K. Metal-organic framework with optimally selective xenon adsorption and separation. Nature Communications, 2016, 7(1): 11831

35 Chakraborty D, Nandi S, Maity R, Motkuri R K, Han K S, Collins S, Humble P, Hayes J C, Woo T K, Vaidhyanathan R, Thallapally P K. An ultra-microporous metal-organic framework with exceptional Xe capacity. Chemistry—A European Journal, 2020, 26(55): 12544–12548

36 Kim M B, Robinson A J, Sushko M L, Thallapally P K. Aluminum-based microporous metal-organic framework for noble gas separation. Journal of Industrial and Engineering Chemistry, 2023, 118: 181–186

37 Elsaidi S K, Mohamed M H, Simon C M, Braun E, Pham T, Forrest K A, Xu W, Banerjee D, Space B, Zaworotko M J. . Effect of ring rotation upon gas adsorption in SIFSIX-3-M (M = Fe, Ni) pillared square grid networks. Chemical Science, 2017, 8(3): 2373–2380

38 Banerjee D, Elsaidi S K, Thallapally P K. Xe adsorption and separation properties of a series of microporous metal-organic frameworks (MOFs) with V-shaped linkers. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 2017, 5(32): 16611–16615

39 Wang L, Liu W, Ding J, Zhang H, Zhu Y, Luo F. A robust calcium-organic framework for effective separation of xenon and krypton. Crystal Growth & Design, 2021, 21(2): 954–959

40 Wang L, Ding J, Zhu Y, Xu Z, Fan Y, Krishna R, Luo F. A robust metal-organic framework showing two distinct pores for effective separation of xenon and krypton. Microporous and Mesoporous Materials, 2021, 326: 111350

41 Zhang H, Fan Y, Krishna R, Feng X, Wang L, Luo F. Robust metal-organic framework with multiple traps for trace Xe/Kr separation. Science Bulletin, 2021, 66(11): 1073–1079

42 Wei Y, Qi F, Li Y, Min X, Wang Q, Hu J, Sun T. Efficient Xe selective separation from Xe/Kr/N₂ mixtures over a microporous CALF-20 framework. RSC Advances, 2022, 12(28): 18224–18231

43 Yu L, Xiong S, Lin Y, Li L, Peng J, Liu W, Huang X, Wang H, Li J. Tuning the channel size and structure flexibility of metal-organic frameworks for the selective adsorption of noble gases. Inorganic Chemistry, 2019, 58(22): 15025–15028

44 Gong L, Liu Y, Ren J, Al-Enizi A M, Nafady A, Ye Y, Bao Z, Ma S. Utilization of cationic microporous metal-organic framework for efficient Xe/Kr separation. Nano Research, 2022, 15(8): 7559–7564

45 Xiong S, Gong Y, Hu S, Wu X, Li W, He Y, Chen B, Wang X. A microporous metal-organic framework with commensurate adsorption and highly selective separation of xenon. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 2018, 6(11): 4752–4758

46 Maldonado R R, Zhang X, Hanna S, Gong X, Gianneschi N C, Hupp J T, Farha O K. Squeezing the box: isoreticular contraction of pyrene-based linker in a Zr-based metal-organic framework for Xe/Kr separation. Dalton Transactions, 2020, 49(20): 6553–6556

47 Lee S J, Yoon T U, Kim A R, Kim S Y, Cho K H, Hwang Y K, Yeon J W, Bae Y S. Adsorptive separation of xenon/krypton mixtures using a zirconium-based metal-organic framework with high hydrothermal and radioactive stabilities. Journal of Hazardous Materials, 2016, 320: 513–520

48 Yan Z, Gong Y, Chen B, Wu X, liu Q, Cui L, Xiong S, Peng S. Methyl functionalized Zr-Fum MOF with enhanced xenon adsorption and separation. Separation and Purification Technology, 2020, 239: 116514

49 Yan Z, Gong Y, Yang C T, Wu X, Liu B, Liu Q, Xiong S, Peng S. Pore size reduction by methyl function in aluminum-based metal-organic frameworks for xenon/krypton separation. Crystal Growth & Design, 2020, 20(12): 8039–8046

50 Zhou J, Ke T, Steinke F, Stock N, Zhang Z, Bao Z, He X, Ren Q, Yang Q. Tunable confined aliphatic pore environment in robust metal-organic frameworks for efficient separation of gases with a similar structure. Journal of the American Chemical Society, 2022, 144(31): 14322–14329

51 Liu B, Yan Z, Liu Q, Gong Y, Wu X, Mao Z, Xiong S, Hu S. Boosting Xe/Kr separation by a mixed-linker strategy in radiation-resistant aluminum-based metal-organic frameworks. Separation and Purification Technology, 2023, 311: 123335

52 Zhu Z, Li B, Liu X, Zhang P, Chen S, Deng Q, Zeng Z, Wang J, Deng S. Efficient Xe/Kr separation on two metal-organic frameworks with distinct pore shapes. Separation and Purification Technology, 2021, 274: 119132

53 Gong W, Xie Y, Pham T D, Shetty S, Son F A, Idrees K B, Chen Z, Xie H, Liu Y, Snurr R Q, Chen B, Alameddine B, Cui Y, Farha O K. Creating optimal pockets in a clathrochelate-based metal-organic framework for gas adsorption and separation: experimental and computational studies. Journal of the American Chemical Society, 2022, 144(8): 3737–3745

54 Fu X P, Li Z R, Liu Q Y, Guan H, Wang Y L. Microporous metal-organic framework with cage-within-cage structures for xenon/krypton separation. Industrial & Engineering Chemistry Research, 2022, 61(21): 7397–7402

55 Li G, Ji G, Wang X, Liu W, Zhang D, Chen L, He L, Liang S, Li X, Ma F, Wang S. Efficient and selective capture of xenon over krypton by a window-cage metal-organic framework with parallel aromatic rings. Separation and Purification Technology, 2022, 295: 121281

56 Idrees K B, Chen Z, Zhang X, Mian M R, Drout R J, Islamoglu T, Farha O K. Tailoring pore aperture and structural defects in zirconium-based metal-organic frameworks for krypton/xenon separation. Chemistry of Materials, 2020, 32(9): 3776–3782

57 Lee S J, Kim K C, Yoon T U, Kim M B, Bae Y S. Selective dynamic separation of Xe and Kr in Co-MOF-74 through strong binding strength between Xe atom and unsaturated Co²⁺ site. Microporous and Mesoporous Materials, 2016, 236: 284–291

58 Tao Y, Fan Y, Xu Z, Feng X, Krishna R, Luo F. Boosting selective adsorption of Xe over Kr by double-accessible open-metal site in metal-organic framework: experimental and theoretical research. Inorganic Chemistry, 2020, 59(16): 11793–11800

59 Guo L, Zheng F, Xu Q, Chen R, Sun H, Chen L, Zhang Z, Yang Q, Yang Y, Ren Q, Bao Z. Double-accessible open metal sites in metal-organic frameworks with suitable pore size for efficient Xe/Kr separation. Industrial & Engineering Chemistry Research, 2022, 61(21): 7361–7369

60 Wang T, Peng Y L, Lin E, Niu Z, Li P, Ma S, Zhao P, Chen Y, Cheng P, Zhang Z. Robust bimetallic ultramicroporous metal-organic framework for separation and purification of noble gases. Inorganic Chemistry, 2020, 59(7): 4868–4873

61 Pei J, Gu X W, Liang C C, Chen B, Li B, Qian G. Robust and radiation-resistant hofmann-type metal-organic frameworks for record xenon/krypton separation. Journal of the American Chemical Society, 2022, 144(7): 3200–3209

62 Wang Y, Liu W, Bai Z, Zheng T, Silver M A, Li Y, Wang Y, Wang X, Diwu J, Chai Z, Wang S. Employing an unsaturated Th⁴⁺ site in a porous thorium-organic framework for Kr/Xe uptake and separation. Angewandte Chemie International Edition, 2018, 57(20): 5783–5787

63 Wu X L, Li Z J, Zhou H, Yang G, Liu X Y, Qian N, Wang W, Zeng Y S, Qian Z H, Chu X X, Liu W. Enhanced adsorption and separation of xenon over krypton via an unsaturated calcium center in a metal-organic framework. Inorganic Chemistry, 2021, 60(3): 1506–1512

64 Zhang C, Dong X, Chen Y, Wu H, Yu L, Zhou K, Wu Y, Xia Q, Wang H, Han Y, Li J. Balancing uptake and selectivity in a copper-based metal-organic framework for xenon and krypton separation. Separation and Purification Technology, 2022, 291: 120932

65 Mohamed M H, Elsaidi S K, Pham T, Forrest K A, Schaef H T, Hogan A, Wojtas L, Xu W, Space B, Zaworotko M J, Thallapally P K. Hybrid ultra-microporous materials for selective xenon adsorption and separation. Angewandte Chemie International Edition, 2016, 55(29): 8285–8289

66 Zheng F, Guo L, Chen R, Chen L, Zhang Z, Yang Q, Yang Y, Su B, Ren Q, Bao Z. Shell-like xenon nano-traps within angular anion-pillared layered porous materials for boosting Xe/Kr separation. Angewandte Chemie International Edition, 2022, 61(20): e202116686

67 Wang X, Ma F, Xiong S, Bai Z, Zhang Y, Li G, Chen J, Yuan M, Wang Y, Dai X, Chai Z, Wang S. Efficient Xe/Kr separation based on a lanthanide-organic framework with one-dimensional local positively charged rhomboid channels. ACS Applied Materials & Interfaces, 2022, 14(19): 22233–22241

68 Liu B Y, Gong Y J, Wu X N, Liu Q, Li W, Xiong S S, Hu S, Wang X L. Enhanced xenon adsorption and separation with an anionic indium-organic framework by ion exchange with Co²⁺. RSC Advances, 2017, 7(87): 55012–55019

69 Wang H, Shi Z, Yang J, Sun T, Rungtaweevoranit B, Lyu H, Zhang Y B, Yaghi O M. Docking of Cu(I) and Ag(I) in metal-organic frameworks for adsorption and separation of xenon. Angewandte Chemie International Edition, 2021, 60(7): 3417–3421

70 Gong W, Xie Y, Wang X, Kirlikovali K O, Idrees K B, Sha F, Xie H, Liu Y, Chen B, Cui Y, Farha O K. Programmed polarizability engineering in a cyclen-based cubic Zr(IV) metal-organic framework to boost Xe/Kr separation. Journal of the American Chemical Society, 2023, 145(4): 2679–2689

71 Liu J, Strachan D M, Thallapally P K. Enhanced noble gas adsorption in Ag@MOF-74Ni. Chemical Communications, 2014, 50(4): 466–468

72 Chen X, Plonka A M, Banerjee D, Krishna R, Schaef H T, Ghose S, Thallapally P K, Parise J B. Direct observation of Xe and Kr adsorption in a Xe-selective microporous metal-organic framework. Journal of the American Chemical Society, 2015, 137(22): 7007–7010

73 Li L, Guo L, Zhang Z, Yang Q, Yang Y, Bao Z, Ren Q, Li J. A robust squarate-based metal-organic framework demonstrates record-high affinity and selectivity for xenon over krypton. Journal of the American Chemical Society, 2019, 141(23): 9358–9364

74 Lee S J, Kim S, Kim E J, Kim M, Bae Y S. Adsorptive separation of xenon/krypton mixtures using ligand controls in a zirconium-based metal-organic framework. Chemical Engineering Journal, 2018, 335: 345–351

75 Wang H, Li J. General strategies for effective capture and separation of noble gases by metal-organic frameworks. Dalton Transactions, 2018, 47(12): 4027–4031

76 Ryan P, Farha O K, Broadbelt L J, Snurr R Q. Computational screening of metal-organic frameworks for xenon/krypton separation. American Institute of Chemical Engineers Journals, 2011, 57(7): 1759–1766

77 Sikora B J, Wilmer C E, Greenfield M L, Snurr R Q. Thermodynamic analysis of Xe/Kr selectivity in over 137000 hypothetical metal-organic frameworks. Chemical Science, 2012, 3(7): 2217–2223

78 Kancharlapalli S, Natarajan S, Ghanty T K. Confinement-directed adsorption of noble gases (Xe/Kr) in MFM-300(M)-based metal-organic framework materials. Journal of Physical Chemistry C, 2019, 123(45): 27531–27541

79 Zarabadi-Poor P, Marek R. In silico study of (Mn, Fe, Co, Ni, Zn)-BTC metal-organic frameworks for recovering xenon from exhaled anesthetic gas. ACS Sustainable Chemistry & Engineering, 2018, 6(11): 15001–15006

80 Guo F, Liu Y, Hu J, Liu H, Hu Y. Fast screening of porous materials for noble gas adsorption and separation: a classical density functional approach. Physical Chemistry Chemical Physics, 2018, 20(44): 28193–28204

81 Riley B J, Chong S, Kuang W, Varga T, Helal A S, Galanek M, Li J, Nelson Z J, Thallapally P K. Metal-organic framework-polyacrylonitrile composite beads for xenon capture. ACS Applied Materials & Interfaces, 2020, 12(40): 45342–45350

82 Elsaidi S K, Ongari D, Xu W, Mohamed M H, Haranczyk M, Thallapally P K. Xenon recovery at room temperature using metal-organic frameworks. Chemistry—A European Journal, 2017, 23(45): 10758–10762

83 Niu Z, Fan Z, Pham T, Verma G, Forrest K A, Space B, Thallapally P K, Al-Enizi A M, Ma S. Self-adjusting metal-organic framework for efficient capture of trace xenon and krypton. Angewandte Chemie International Edition, 2022, 61(11): e202117807

84 Liu J, Fernandez C A, Martin P F, Thallapally P K, Strachan D M. A two-column method for the separation of Kr and Xe from process off-gases. Industrial & Engineering Chemistry Research, 2014, 53(32): 12893–12899

85 Elsaidi S K, Mohamed M H, Helal A S, Galanek M, Pham T, Suepaul S, Space B, Hopkinson D, Thallapally P K, Li J. Radiation-resistant metal-organic framework enables efficient separation of krypton fission gas from spent nuclear fuel. Nature Communications, 2020, 11(1): 3103

86 Zhang Y, Zhang X, Lyu J, Otake K i, Wang X, Redfern L R, Malliakas C D, Li Z, Islamoglu T, Wang B. . A flexible metal-organic framework with 4-connected Zr₆ nodes. Journal of the American Chemical Society, 2018, 140(36): 11179–11183

87 Wang T C, Bury W, Gómez-Gualdrón D A, Vermeulen N A, Mondloch J E, Deria P, Zhang K, Moghadam P Z, Sarjeant A A, Snurr R Q. . Ultrahigh surface area zirconium MOFs and insights into the applicability of the BET theory. Journal of the American Chemical Society, 2015, 137(10): 3585–3591

88 Reinsch H, Waitschat S, Stock N. Mixed-linker MOFs with CAU-10 structure: synthesis and gas sorption characteristics. Dalton Transactions, 2013, 42(14): 4840–4847

89 Fu X P, Wang Y L, Zhang X F, Zhang Z, He C T, Liu Q Y. Fluorous metal-organic frameworks with unique cage-in-cage structures featuring fluorophilic pore surfaces for efficient C₂H₂/CO₂ separation. Chinese Chemical Society Chemistry, 2022, 4(10): 3416–3425

90 Yu G, Liu Y, Zou X, Zhao N, Rong H, Zhu G. A nanosized metal-organic framework with small pores for kinetic xenon separation. Journal of Materials Chemistry. A, Materials for Energy and Sustainability, 2018, 6(25): 11797–11803

91 Abramova A, Couzon N, Leloire M, Nerisson P, Cantrel L, Royer S, Loiseau T, Volkringer C, Dhainaut J. Extrusion-spheronization of UiO-66 and UiO-66_NH₂ into robust-shaped solids and their use for gaseous molecular iodine, xenon, and krypton adsorption. ACS Applied Materials & Interfaces, 2022, 14(8): 10669–10680

92 Caskey S R, Wong-Foy A G, Matzger A J. Dramatic tuning of carbon dioxide uptake via metal substitution in a coordination polymer with cylindrical pores. Journal of the American Chemical Society, 2008, 130(33): 10870–10871

93 Dietzel P D C, Panella B, Hirscher M, Blom R, Fjellvåg H. Hydrogen adsorption in a nickel based coordination polymer with open metal sites in the cylindrical cavities of the desolvated framework. Chemical Communications, 2006, 9(9): 959–961

94 Dietzel P D C, Besikiotis V, Blom R. Application of metal-organic frameworks with coordinatively unsaturated metal sites in storage and separation of methane and carbon dioxide. Journal of Materials Chemistry, 2009, 19(39): 7362–7370

95 Perry IV J J, Teich-McGoldrick S L, Meek S T, Greathouse J A, Haranczyk M, Allendorf M D. Noble gas adsorption in metal-organic frameworks containing open metal sites. Journal of Physical Chemistry C, 2014, 118(22): 11685–11698

96 Luo F, Yan C, Dang L, Krishna R, Zhou W, Wu H, Dong X, Han Y, Hu T L, O’Keeffe M. . UTSA-74: a MOF-74 isomer with two accessible binding sites per metal center for highly selective gas separation. Journal of the American Chemical Society, 2016, 138(17): 5678–5684

97 Liu Q, Gong Y, Liu B, Xiong S, Wen H M, Wang X. Dense packing of xenon in an ultra-microporous metal-organic framework for benchmark xenon capture and separation. Chemical Engineering Journal, 2023, 453: 139849

98 Mohamed M H, Elsaidi S K, Wojtas L, Pham T, Forrest K A, Tudor B, Space B, Zaworotko M J. Highly selective CO₂ uptake in uninodal 6-connected “mmo” nets based upon MO₄^2– (M = Cr, Mo) pillars. Journal of the American Chemical Society, 2012, 134(48): 19556–19559

99 Burd S D, Nugent P S, Mohameda M H, Elsaidia S K, Zaworotko M J. Square grid and pillared square grid coordination polymers—fertile ground for crystal engineering of structure and function. Chimia, 2013, 67(6): 372–378

100 Mohamed M H, Elsaidi S K, Pham T, Forrest K A, Tudor B, Wojtas L, Space B, Zaworotko M J. Pillar substitution modulates CO₂ affinity in “mmo” topology networks. Chemical Communications, 2013, 49(84): 9809–9811

101 Gu X, Lu Z H, Jiang H L, Akita T, Xu Q. Synergistic catalysis of metal-organic framework-immobilized Au-Pd nanoparticles in dehydrogenation of formic acid for chemical hydrogen storage. Journal of the American Chemical Society, 2011, 133(31): 11822–11825

102 Dixit M, Adit Maark T, Ghatak K, Ahuja R, Pal S. Scandium-decorated MOF-5 as potential candidates for room-temperature hydrogen storage: a solution for the clustering problem in MOFs. Journal of Physical Chemistry C, 2012, 116(33): 17336–17342

103 Sumida K, Stück D, Mino L, Chai J D, Bloch E D, Zavorotynska O, Murray L J, Dincă M, Chavan S, Bordiga S. . Impact of metal and anion substitutions on the hydrogen storage properties of M-BTT metal-organic frameworks. Journal of the American Chemical Society, 2013, 135(3): 1083–1091

104 Fairchild D C, Hossain M I, Cordova J, Glover T G, Uribe-Romo F J. Steric and electronic effects on the interaction of Xe and Kr with functionalized zirconia metal-organic frameworks. ACS Materials Letters, 2021, 3(5): 504–510

105 Qian J J, Chen G H, Xiao S T, Li H B, Ouyang Y G, Wang Q. Switching Xe/Kr adsorption selectivity in modified SBMOF-1: a theoretical study. RSC Advances, 2020, 10(29): 17195–17204