Article
Chemistry, Applied
T. Onfroy, Z. Qin, S. Casale, V. Valtchev
Summary: Preparation of hierarchical zeolites through chemical etching is a popular research topic due to its significant improvement on diffusive properties and catalytic activity of microporous materials. This study optimizes the NH4F etching process by using less concentrated solutions and milder conditions, demonstrating the possibility of softening the post-treatment conditions by adjusting synthesis parameters such as NH4F/ZSM-5 ratio, etching time, and initial NH4F concentration, resulting in the generation of mesopores with different diameters.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yudan Gong, Jie Tuo, Shiqing Li, Yuhong Zhao, Hao Xu, Yejun Guan, Jingang Jiang, Peng Wu
Summary: Aluminosilicate nanosheets with pure IDM-1 structure were synthesized by adjusting the F sources, and their catalytic performance in the methanol-to-propylene reaction was improved through tuning the length and suppressing competitive growth.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Bin Wang, Haolin Wu, Liyun Cui, Haoliang Gao, Di Zhao, Junjing Zhou, Shenglai Zhong, Rongfei Zhou, Weihong Xing
Summary: In this study, we successfully synthesized 50-cm-long tubular silicalite-1 membranes and used them for the separation of industrial n-butane/i-butane mixtures for the first time. The membranes showed good reproducibility and exhibited excellent separation performance and stability. The results suggest that silicalite-1 membranes have great potential for the industrial separation of n-/i-butane mixtures.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jin-hyeok Park, Donghun Kim
Summary: Zeolite nanosheets are effective in fabricating high-performance separation membranes, but their direct synthesis is complicated, especially for achieving the desired two-dimensional morphology. However, a simple synthesis method was found for MFI structure-type nanosheets using a single hydrothermal treatment, which had favorable thickness and aspect ratio for membrane fabrication compared to other zeolite MFI materials. The zeolite MFI membranes made from these nanosheets exhibited high flux and separation factor at high temperatures, outperforming membranes made from conventional zeolite MFI materials.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Jiaxing Zhang, Limin Ren, Ajuan Zhou, Wenhui Li, Shujie Shang, Yi Liu, Zhenghao Jia, Wei Liu, Anfeng Zhang, Xinwen Guo, Chunshan Song
Summary: The tailored synthesis of ultrathin ZSM-5 nanosheets with controllable b-axis thickness and aspect ratio was achieved by adjusting the amount and aging time of silicalite-1 seed suspension in the fluoride medium. The seed suspension and fluoride played important roles in the growth process of nanosheets. Thinner nanosheets showed better catalytic performance.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ye Ma, Xiaomin Tang, Junyi Hu, Yanhang Ma, Wei Chen, Zhiqiang Liu, Shichao Han, Cheng Xu, Qinming Wu, Anmin Zheng, Longfeng Zhu, Xiangju Meng, Feng-Shou Xiao
Summary: This study presents the successful synthesis of zeolite nanosheets with excellent mass transfer using a small organic template. The nanosheets exhibit good crystallinity, large surface area, and unique morphology, and show higher propylene selectivity and longer reaction lifetime in the methanol-to-propylene conversion reaction compared to conventional zeolites.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Applied
Bin Xia, Songyi Wang, Beibei Li, Yi Cao, Taohong Liu, Peng Gao, Chen Chen, Yanshuo Li
Summary: The zeolite FAU membrane prepared with the dry gel modified AM method showed high pervaporation performance in water/ethanol mixture, but excessive dry gel content may lead to the formation of impurities. The optimized conditions resulted in a membrane with good reproducibility and efficiency.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Shaowei Yang, Byunghyun Min, Qiang Fu, Christopher W. Jones, Sankar Nair
Summary: Viscosity-confined dry gel conversion (VCDGC) method is demonstrated for the fabrication of high-performance zeolite hollow fiber membranes. The synthesis and performance testing of small-pore CHA and medium-pore MFI membranes showcase the versatility and reliability of this method.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Hammad Saulat, Jianhua Yang, Song Wensen, Waseem Raza, Gaohong He
Summary: Isomorphous substitution of tungsten (W) in the MFI membrane improves hydrophobicity and achieves high selectivity for ethanol, making it a promising candidate for catalysts or separation membranes with wide applications.
CHEMISTRY-AN ASIAN JOURNAL
(2022)
Article
Engineering, Chemical
Shusei Tanizume, Sota Maehara, Katsunori Ishii, Takamasa Onoki, Takuya Okuno, Hiromasa Tawarayama, Shinji Ishikawa, Mikihiro Nomura
Summary: By synthesizing a defect-free MFI zeolite membrane on a porous silica substrate, high selectivity and yield of olefins from methanol conversion can be achieved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Rita Namoe Tabi, Frank Ofori Agyemang, Kwadwo Mensah-Darkwa, Emmanuel Kwesi Arthur, Emmanuel Gikunoo, Francis Momade
Summary: Kaolin from Teleku Bokazo was used to synthesize zeolite, which was further modified with alum, for fluoride ion adsorption. The modified zeolite showed the highest efficiency in removing fluoride ions from contaminated water, with a maximum adsorption capacity of 2.43 mg/g according to the Langmuir model.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Environmental
Shohei Hamabe, Shinji Tawara, Syouhei Nishihama, Kazuharu Yoshizuka
Summary: In this study, a MFI-type zeolite-coated tubular membrane was successfully prepared and evaluated for ultrafiltration system using polar organic solvents. The membrane maintained a stable effective rejection level over a long-term operation of 80 hours, indicating sufficient resistance to polar organic solvents.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Wooyoung Choi, Jin-hyeok Park, Eunji Choi, Minsu Kim, Hyungjoon Ji, Ohchan Kwon, Donghun Kim, Dae Woo Kim
Summary: This study synthesized zeolite MFI nanosheets and introduced them into PTMSP polymer using the shear-coating method. The resulting composite membrane exhibited a horizontally aligned structure with preferentially b-oriented zeolite MFI fillers. The incorporation of zeolite MFI nanosheets improved the gas separation performance, thermal stability, and mechanical strength of the membrane.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Applied
Yeon Jung Oh, Su Kyung Kang, Ah Hyun Lee, Sanha Park, Sejin Kim, Jungkyu Choi, Pyung Soo Lee
Summary: MFI membranes were synthesized using composite seeds consisting of zeolite nanocrystals and amorphous silica nanoparticles. The addition of silica nanoparticles to the seed layer effectively reduced non-zeolite defects in the MFI membranes. The zeolite membrane prepared from a seed layer with 75% zeolite and 25% silica particles exhibited the highest N2/SF6 gas selectivity and N2 gas permeance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Engineering, Chemical
Li Peng, Zhengqi Wu, Boxuan Wang, Hua Liu, Chun Zhang, Xuehong Gu
Summary: Silanol-free MFI zeolite membranes were successfully prepared by the incorporation of tungsten in MFI framework. These membranes showed stable separation performance for ethanol/water mixture and exhibited a certain inhibitory effect on silanol groups.
JOURNAL OF MEMBRANE SCIENCE
(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)