Article
Polymer Science
Zeljka P. Madzarevic, Beatriz Seoane, Jorge Gascon, Maruti Hegde, Theo J. Dingemans
Summary: A series of membranes based on non-linear all-aromatic polyimides were investigated to understand how their backbone geometry and local electrostatics influence gas transport and CO2/CH4 separation ability. The results showed that the non-linear backbone geometry promotes CO2 permeability, while the presence of an electrostatic dipole moment associated with the 1,3,4-oxadiazole heterocycle governs CO2/CH4 separation selectivity.
Article
Engineering, Chemical
Roberto Castro-Munoz, Kumar Agrawal, Zhiping Lai, Joaquin Coronas
Summary: This article discusses the opportunities and challenges of using nanoporous materials for gas separation in emerging energy technologies, such as zeolites, metal-organic materials, and graphene derivatives. It emphasizes the need for improved porosity control of 2D materials and reduction in the selective membrane skin layer. The review also examines various membrane module configurations and process requirements, highlighting the promising future of scaled spiral wound and hollow fiber modules for CO2 and H2 separations. Lastly, the article provides valuable recommendations for researchers in the field.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jun-Yi Wang, Yen-Hsun Chi, Jin-Hua Huang
Summary: Sequential addition of hydrazine in an EDTA-free bath resulted in the fabrication of high-performance composite Pd membranes with improved selectivity and cycling stability compared to membranes made using EDTA-contained bath.
Article
Engineering, Chemical
S. R. Kuzenov, V. N. Alimov, A. O. Busnyuk, E. U. Peredistov, A. I. Livshits
Summary: Vanadium alloy membranes with added Fe are a promising alternative to palladium alloy membranes for producing ultrapure hydrogen. The hydrogen permeation through the studied alloys was significantly higher than through a similar Pd membrane. The hydrogen diffusivity in the alloy decreased with increasing alloying degree kappa and was generally lower than in pure V.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Physical
Lu Zhang, Guijiu Xie, Fuyi Liu, Huiming Ji
Summary: A Pd-Ni film hydrogen sensor with high hydrogen response and selectivity was prepared by coating a 1.3 pm-thick organosilica membrane on the surface of the Pd-Ni alloy film. The gas sensing performance of the sensor was tested and showed improved response in both N2 and air atmosphere. The presence of oxygen did not affect the response of the sensor to hydrogen, although the response/recovery time increased. The mechanism of response and selectivity enhancement was explored.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Chemical
Cuihua Ma, Qinghua Li, Zhi Wang, Min Gao, Jixiao Wang, Xingzhong Cao
Summary: High-performance thin-film composite (TFC) membranes were prepared by interfacial polymerization, which exhibited remarkable improvement in gas separation performance due to the introduction of rigid and contorted structures.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Yang Jiao, Mengdi Liu, Qi Wu, Peijun Zheng, Wei Xu, Bangjiao Ye, Hongjun Zhang, Ruilan Guo, Shuangjiang Luo
Summary: In this study, high-performance polybenzimidazole (PBI) membranes were developed with well-defined microporosity and size-sieving ability for helium and hydrogen recovery. The incorporation of hierarchical triptycene units and polyprotic acid doping resulted in significantly enhanced gas permeability and selectivity compared to previous PBI membranes. The triptycene-based polybenzimidazole (TPBI) composite membranes exhibited the highest gas selectivities among existing polymeric gas separation membranes, making them highly attractive for helium and hydrogen separation.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ivan Savvotin, Elena Berdonosova, Artem Korol, Vladislav Zadorozhnyy, Mikhail Zadorozhnyy, Evgeniy Statnik, Alexander Korsunsky, Mikhail Serov, Semen Klyamkin
Summary: The peculiarities of hydrogenation in the single-phase TiZrVNbTa equiatomic high-entropy alloy were revealed using a combination of microcalorimetric hydrogen titration technique and conventional volumetric measurements. The alloy was produced as microfibers using the pendent drop melt extraction technique and Palladium coating was applied to enable first hydrogenation at room temperature without additional activation. The analysis of the obtained data allowed for evaluation of the dependence of hydrogenation enthalpy on the hydrogen concentration in the alloy, identifying three concentration ranges corresponding to the formation of hydrogen solid solution, monohydride, and dihydride phases with determined ?H values of about -100, -80, and -60 kJ/mol H-2, respectively.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Applied
Eleonora Tosto, David Martinez-Diaz, Raul Sanz, Giulia Azzato, Jose Antonio Calles, Jose Antonio Medrano, Ekain Fernandez, David Alfredo Pacheco Tanaka, Fausto Gallucci, David Alique, Alessio Caravella
Summary: This study demonstrates the application of systematic experimental analysis to estimate the paired effects of concentration polarization and inhibition in hydrogen permeation through diverse supported Pd-based membranes. By fabricating and testing different membranes, the influence under various conditions was evaluated. The results highlight the importance of taking these detrimental phenomena into account in designing ultra-thin membrane equipment.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jilong Wang, Yaqi Fan, Jingang Jiang, Zheng Wan, Shuyue Pang, Yejun Guan, Hao Xu, Xiao He, Yanhang Ma, Aisheng Huang, Peng Wu
Summary: Membrane separation is an energy-efficient and environmentally friendly process that can achieve highly permeable and selective mixture separation. Two-dimensional molecular sieving membranes with unique nanopores and low transport resistance are desirable, but limited by the availability of recognized zeolite nanosheets. A newly reported swollen layered zeolite, ECNU-28, with high hydrogen selectivity offers promise for hydrogen purification and greenhouse gas capture.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Environmental
Justin Easa, Chang Yan, William F. Schneider, Casey P. O'Brien
Summary: This study compares the inhibiting effects of CO and C3H6 on H-2 permeation across Pd77Ag23 and Pd membranes, showing that alloying Pd with Ag can enhance its sensitivity to poisoning. CO primarily inhibits H-2 permeation by adsorbing on available sites, while C3H6 affects electronic structure to hinder H-2 dissociation on both Pd and Pd77Ag23 surfaces.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Yang Han, W. S. Winston Ho
Summary: This review discusses the fundamentals of CO2/gas separation in polymeric membranes and explores the opportunities and challenges for various applications such as post-combustion carbon capture, hydrogen purification, and gas sweetening. It also highlights emerging polymeric membrane materials and promising candidates for CO2 separation applications, while comparing permeability-selectivity data against their upper bounds in 2008 and 2019.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Physical
Margot A. Llosa Tanco, Jose A. Medrano, Valentina Cechetto, Fausto Gallucci, David A. Pacheco Tanaka
Summary: Blending a low amount of hydrogen into existing natural gas grids and separating it using Al-CMSM membranes can achieve the storage and transport of hydrogen efficiently. Research shows that high purity hydrogen separation can be achieved under specific conditions, providing new possibilities for the application of hydrogen energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Seongmin Jin, Yongha Park, Young Suk Jo, Chang-Ha Lee
Summary: A sorption-enhanced water-gas shift membrane reactor (SE-WGS-MR) system developed in this study combines catalytic reaction, adsorptive separation, and membrane purification to capture carbon dioxide and purify H-2, demonstrating high-purity H-2 production potential.
CELL REPORTS PHYSICAL SCIENCE
(2022)
Article
Engineering, Chemical
Mengjie Hou, Lin Li, Jing Song, Ruisong Xu, Zilong He, Yunhua Lu, Zonglin Pan, Chengwen Song, Tonghua Wang
Summary: A novel polyimide precursor was synthesized to fabricate carbon molecular sieve membranes for hydrogen purification, and the membrane's hydrogen separation performance was optimized by adjusting the pyrolysis temperature. The CMSM derived at high pyrolysis temperature showed low carbon structural densification and excellent H2 selectivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
