Article
Engineering, Chemical
Katerina Setnickova, Tse-Chiang Huang, Ching-Ting Wang, Yi-Chen Lin, Sher Ling Lee, Guo-Liang Zhuang, Kuo-Lun Tung, Hui-Hsin Tseng, Petr Uchytil
Summary: This study investigates the importance of the intermediate layer in carbon molecular sieve membrane formation and its impact on gas separation performance. Experimental results show that preparation conditions significantly affect the structure and separation efficiency of CMS/TiO2 membranes, with the thickness of the intermediate TiO2 layer and the defect level of the carbon separation layer playing key roles in membrane performance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Yosuke Nakamura, Sachiko Matsushita, Akira Nakajima, Toshihiro Isobe
Summary: Carbon-based membranes were synthesized on porous alumina via a hydrothermal method from aqueous glucose solutions. The hydrothermal treatment time and temperature were evaluated to study their effects on the microstructure of the membranes. The obtained carbon membranes were found to be deposited both on the surface and in the interiors of the porous alumina. The carbon membrane prepared at a hydrothermal treatment of 200 degrees C for 5 hours showed few pinholes and consisted of amorphous carbon with hydroxy groups. Gas transmission rate measurements indicated that the membrane had a pore size of approximately 0.3 nm and exhibited high selectivity for various gas mixtures.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Chemical
Shan Xu, Ning Zhao, Lei Wu, Shuanyan Kang, Zhiguang Zhang, Guolong Huo, Zhongde Dai, Nanwen Li
Summary: Optimizing the microstructure of carbon molecular sieve (CMS) membranes can improve gas separation performance. This study demonstrates that using a thermally crosslinkable precursor can enhance the permeability and selectivity of CMS membranes.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Seong-Joong Kim, Jeong F. Kim, Young Hoon Cho, Seung-Eun Nam, Hosik Park, You-In Park
Summary: The study found that pre-crosslinking density is critical for the aging suppression of CMS membranes, resulting in a significant improvement in long-term stability.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Engineering, Chemical
Haojie Li, Bingyu Zhao, Yuxiu Yu, Yaodong Liu
Summary: Silicon atoms in the form of siloxane-Cl were introduced into a polyimide precursor membrane to improve the compatibility with carbon molecular sieve membrane (CMSM). By varying the content of siloxane-Cl, the composite membrane showed improved gas separation performance. The incorporation of silicon in CMSMs in proper forms significantly improved their molecular sieving and anti-aging performances.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Shuo Liu, Zixi Kang, Lili Fan, Xuting Li, Bingchen Zhang, Yang Feng, Hongyan Liu, Weidong Fan, Rongming Wang, Daofeng Sun
Summary: A new type of CMS membrane derived from a crystalline porous hydrogen-bonded organic framework membrane (HCMS) was reported for the first time. By controlling the pyrolysis temperature, the CO2/CH4 separation performance of the HCMS membrane was optimized, showing remarkable selectivity and excellent separation stability.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Tae Hoon Lee, Farhad Moghadam, Jae Gu Jung, Yu Jin Kim, Ji Soo Roh, Seung Yeon Yoo, Byung Kwan Lee, Jin Hee Kim, Ingo Pinnau, Ho Bum Park
Summary: A versatile approach to fabricate hybrid CMS membranes with unique textural properties and tunable ultramicroporosity is proposed in this study. The HCMS membranes exhibit superior gas separation performances compared to conventional polymers and CMS membranes, especially for closely sized gas pairs. This development demonstrates practical feasibility for use in industrial mixed-gas operation conditions.
Article
Chemistry, Physical
Ruisong Xu, Mengjie Hou, Yue Wang, Lin Li, Zonglin Pan, Chengwen Song, Tonghua Wang
Summary: The carbon molecular sieve (CMS) membranes derived from a novel precursor polymer of phenolphthalein-based poly(arylene ether ketone) (PEK-C) exhibit high C2H4 permeability and superior C2H4/C2H6 selectivity, showing great potential for industrial applications of C2H4/C2H6 separation.
Article
Chemistry, Multidisciplinary
Guoxiong Deng, Yilei Wang, Xueping Zong, Jiangzhou Luo, Xuezhen Wang, Chunxue Zhang, Song Xue
Summary: The study shows that esterification of binaphthol-based polyimide affects the pore structure and gas permeability of the derived carbon membranes.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Chemical
Lujie Sheng, Jizhong Ren, Dan Zhao, Hui Li, Kaisheng Hua, Maicun Deng
Summary: The study investigated the structural evolution and gas separation performance changes of P84 HFMs from polymer to carbonization stages, revealing that the substructure of P84 HFMs began to collapse during the intermediate stage, which affected the gas permeance of P84 CMS HFMs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jong Geun Seong, Jeremy C. Lewis, John A. Matteson, Erica Craddock, Ulises Martinez, Harshul Thakkar, Angelica D. Benavidez, Kathryn A. Berchtold, Rajinder P. Singh
Summary: Polymer membrane carbonization is a promising strategy for obtaining carbon molecular sieve (CMS) membrane materials with tailorable cavity size distributions. In this study, highly O-2 permselective CMS hollow fiber membranes (HFMs) derived from rigid PBI materials were fabricated and evaluated for O-2/N-2 separation performance.
Article
Chemistry, Physical
Tiago Araujo, Andrew J. Parnell, Gabriel Bernardo, Adelio Mendes
Summary: Carbon molecular sieve membranes were prepared by carbonizing a cellulose-based polymeric pre-cursor doped with urea. The addition of urea increased the structural disorder and pore volume of the membranes. This unique preparation method effectively allows tuning of the pore size for desired separations, with urea acting as a pore-forming agent. With the addition of 2.8 wt% urea, the permeability of the prepared carbon membrane to hydrogen was doubled, while maintaining selectivity and obtaining a permeability to oxygen of 333 barrer.
Article
Chemistry, Multidisciplinary
Zhongyun Liu, Wulin Qiu, William J. Koros
Summary: This study investigates the structure evolution of CMS membranes during physical aging using a combined dual-mode sorption and transport model, revealing that aging primarily affects diffusion and leads to changes in pore structure and performance. These insights offer strategies for controlling physical aging and tuning the separation performance of CMS membranes.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemistry & Molecular Biology
Yanqiu Pan, Liu He, Yisu Ren, Wei Wang, Tonghua Wang
Summary: In this study, the relationship between gas separation performance, multiple membrane structure, and gas characteristic factors of carbon molecular sieve (CMS) membrane was analyzed using machine learning techniques. A quantitative index based on Robeson's upper bound line was proposed to measure the gas separation performance of CMS membrane. The key factors affecting the gas permeability and separation performance of CMS membrane were identified.
Article
Chemistry, Applied
Ansgar Kretzschmar, Victor Selmert, Hans Kungl, Hermann Tempel, Ruediger A. Eichel
Summary: Molecular sieves are important for gas separation and material characterization due to their ability to discriminate substances by size. This study evaluates different concepts for estimating gas molecule size and highlights some drawbacks of the widely used kinetic diameter. Alternative recommendations from existing literature are presented.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Lulu Wan, Gan Ye, Yuying Chang, Zhaohan Yang, Guangming Shi, Qiuli Zhang, Jin Wang
Summary: This study developed an efficient approach to upgrade the oxidative desulfurization (ODS) performance of Zr-MOFs with proton stimulation. Experimental results showed that the introduction of protons can significantly improve the ODS efficiency. This work provides a facile and efficient strategy for enhancing the ODS performance of pristine MOFs.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Qiqi Lu, Xiu-Zhi Wei, Qi Zhang, Xinghua Zhang, Lungang Chen, Jianguo Liu, Yubao Chen, Longlong Ma
Summary: The application of Pd-M bimetallic clusters in the selective hydrogenation reaction was investigated, and the Pd0.6Ni@S-1 catalyst was found to exhibit high selectivity in the conversion of phenylacetylene to styrene. The confinement effect of zeolite inhibited over-hydrogenation and improved the stability of the catalysts. Furthermore, the solvent properties also influenced the product distribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Review
Chemistry, Applied
Bo Li, Lumin Hong, Changdi Jing, Xianyang Yue, Huabo Huang, Qianqian Jiang, Jianguo Tang
Summary: MOF materials with adjustable pore structure and polymetallic sites have been explored as electrocatalysts for OER. Bimetallic materials show higher electrocatalytic activity than monometallic materials, while carbon-coated and doped MOF catalysts exhibit stable and good OER activity. The synergistic interaction between polymetallic active sites effectively improves the intrinsic activity of MOF on OER.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shichun Gu, Ruyi Wang, Junxiong Zhang, Hairong Dong, Liping Deng, Xue Wang, Yapeng He
Summary: In this study, monodispersed hollow mesoporous organosilica nanospheres with controlled core cavity and mesoporous shell were successfully synthesized. These hollow nanospheres showed a high adsorption capacity for Pb2+ in water solution and exhibited acceptable recycling and stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Lucie Havelkova, Bogdana Bashta, Michaela Vankova, Jiri Zednik, Jiri Brus, Jan Svoboda, Alice Vagenknechtova, Jan Sedlacek
Summary: An atom-economic one-step chain-growth coordination homopolymerization providing high yields of functionalized hyper-cross-linked polyacetylenes with a permanent micro/mesoporous texture and a BET area of up to 1062 m2/g is reported. The homopolymerization is highly compatible with the heteroatom groups of the monomers and allows the preparation of well-defined porous networks with a wide spectrum of univalent groups.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Shirui Pang, Yuxin Liu, Zhe Zhang, Yuxin Li, Chunguang Li, Zhan Shi, Shouhua Feng
Summary: This study focuses on using a functional separator to suppress the shuttle effect of soluble lithium polysulfides in Li-S batteries. It is found that the functionalized sulfonic acid group not only accelerates the conduction of lithium ions, but also repels polysulfide anions through electrostatic interactions. The performance of the batteries is significantly improved with the use of this functionalized separator.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Pingping Li, Lei Han, Donghun Kim, Kemal Celebi
Summary: This study presents a fast synthetic strategy for the preparation of high-quality platelike MFI crystals using a thin-wall tubular reactor. The strategy is efficient, time-saving, and can be optimized, making it applicable to the preparation and optimization of other important materials.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Haitao Yin, Wei Wang, Yuxin Li, Hu Wen, Shuang Chen, Nanzhe Jiang
Summary: This study presents a template-free and solid-state-like crystallisation method for the synthesis of ZSM-5 zeolite, which can be scaled-up in production. Mechanical mixing of starting material components improves the dispersion of materials, leading to ZSM-5 zeolite with high crystallinity and size uniformity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Congli Li, Jiang Wang, Zhenfei Wang, Jinxiang Dong, Qi Shi
Summary: This study investigates the evolution and autoreduction behavior of Cu species in CuCl/NaY adsorbent during vacuum thermal activation. It is found that Cu species migrate from supercages to the nearby plane of the six-membered ring connecting the supercage and sod cage during vacuum activation. At 150 degrees C, vacuum autoreduction occurs, resulting in the formation of Cu+Cl- species. The results provide reference for the preparation of pi-complex adsorbents.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Irena Khatrin, Iman Abdullah, Alan J. Mccue, Yuni K. Krisnandi
Summary: Hierarchical porous system with two types of mesopores provides a solution to the diffusion limitation in conventional zeolites. Cobalt oxide impregnated hierarchical ZSM-5 zeolite samples with intra- and inter-crystalline mesopores were synthesized using two different strategies. The physicochemical properties of the modified catalysts were analyzed, revealing distinct features given by the two mesoporous configurations. Catalytic activity analysis showed that Co-oxide/ZSM-5 with inter-crystalline mesopores exhibited higher activity in methane partial oxidation reaction compared to Co-oxide/ZSM-5 with intra-crystalline mesopores.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Nataliia Reinders, Martin Durovic, Pavla Honcova, Zaneta Dohnalova, Jana Luxova, Stanislav Slang, Jhonatan Rodriguez-Pereira, Petra S. Sulcova
Summary: This study presents a new method for preparing a microporous Ni2P/C catalyst with high catalytic activity. The redox reaction and carbon matrix formation during high-temperature treatment contribute to the stability and activity of the catalyst. Experimental and analytical results suggest that the microporous structure of the composite plays a crucial role in its catalytic performance. These findings are important for practical applications of efficient hydrogen production by water electrolysis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Ana Raquel Bertao, Viktoriya Ivasiv, Cristina Almeida-Aguiar, Patricia R. Correia, Antonio M. Fonseca, Manuel Banobre-Lopez, Fatima Baltazar, Isabel C. Neves
Summary: This study developed a zeolite-based delivery system (ZDS) using silver and 5-Fluorouracil as antimicrobial and antineoplastic agents. The ZDS was characterized and its antimicrobial properties were investigated, showing better antibacterial effectiveness for the ZDS containing both silver and 5-FU.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Naonobu Katada, Nobuki Ozawa, Etsushi Tsuji, Keigo Kanehara, Akiho Otsuka, Taiga Sakamoto, Kirari Umezawa, Hitoshi Matsubara, Satoshi Suganuma, Momoji Kubo
Summary: First principles calculations were used to investigate the pathway for methylation of benzene with methane catalyzed by MFI type zeolite-supported Co species. The strong adsorption of benzene on Co is found to lower the activation energy for methane dissociation and promote the formation of toluene precursor. The activation energy of methane dissociation is also affected by the Al-Al distance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Yuan Liu, An T. Ta, Kyoung Chul Park, Shenyang Hu, Natalia B. Shustova, Simon R. Phillpot
Summary: We use density functional theory to investigate the interactions of cerium, americium, and curium cations with crown ethers. Our results demonstrate that crown ethers can capture cerium, americium, and curium ions, and modifying the crown ether structure by substituting nitrogen atoms for oxygen atoms significantly increases their binding energies with radionuclides.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)
Article
Chemistry, Applied
Zhengwu Peng, Shixing Wang, Yihui Wu, Xiang Liu, Hongliang Liu, Dekun Zhang, Likang Fu
Summary: An efficient adsorbent for recovery of germanium was prepared and characterized in this study. The adsorption behavior of Ge(IV) on the adsorbent was analyzed, and the results showed that it follows pseudo-secondary kinetic model and Langmuir isotherm model. The adsorbent exhibited good anionic anti-interference ability and can still maintain high adsorption efficiency after repeated adsorption.
MICROPOROUS AND MESOPOROUS MATERIALS
(2024)