Article
Chemistry, Physical
Sebastian Prodinger, Karoline Kvande, Bjornar Arstad, Elisa Borfecchia, Pablo Beato, Stian Svelle
Summary: In this study, the researchers successfully synthesized Cu-MOR materials with different inclinations for the selective oxidation of methane by varying the relative proportion of aluminum situated near the 8-rings and 12-rings of MOR zeolite. The study confirmed the discrete changes of aluminum within the unit cell through spectroscopic techniques and adsorption experiments, and found that Cu2+ species were the active sites in the selective oxidation of methane.
Review
Chemistry, Applied
Victor de Aguiar Pedott, Gustavo Henrique Moraes, Cintia Soares, Natan Padoin, Humberto Gracher Riella, Cristiano Jose de Andrade
Summary: Explored the potential application of biosurfactants in materials synthesis, highlighting their advantages over synthetic structure directing agents, such as lower concentration requirement, lower surface tension, and lower toxicity, making them a promising green synthesis approach.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Juan Carlos Vega-Vila, Advait Holkar, Ross A. Arnold, Dale P. Prentice, Shiqi Dong, Longwen Tang, Erika Callagon La Plante, Kirk Ellison, Aditya Kumar, Mathieu Bauchy, Samanvaya Srivastava, Gaurav Sant, Dante Simonetti
Summary: This study investigates the adaptable nature of metal cations during hydrothermal synthesis by synthesizing porous materials without organic structure-directing agents. The results show that phillipsite is crystallized selectively in the presence of sodium and potassium, while partial substitution of sodium and potassium with calcium results in the co-precipitation of tobermorite phases. Exclusive tobermorite precipitation is observed when only calcium is used. These findings demonstrate the important role of metal cations in crystallization processes and their ability to vary framework topology in porous materials.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Omer F. Altundal, German Sastre
Summary: In this study, the role of aluminum and fluoride in zeolite synthesis was explored using a force field simulation approach. The stability of zeolites was predicted based on the calculation of synthesis energy. The results showed that aluminum, fluoride, and organic structure-directing agents have a structure-directing effect in zeolite synthesis and can rationalize the role of aluminum in the process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Applied
Radim Pilar, Jaroslava Moravkova, Galina Sadovska, Stepan Sklenak, Libor Brabec, Jana Pastvova, Petr Sazama
Summary: The synthesis of zeolites without using an organic structure-directing agent (OSDA) offers environmental and economic advantages, but it is challenging to achieve kinetic control and stabilize the zeolites. This study demonstrates that the synthesis of OSDA-free zeolite is a dynamic process in which the zeolite undergoes transformation after crystallization to a more stable phase. Kinetic control is crucial for the selective formation of metastable zeolites in OSDA-free synthesis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Corentin Chatelard, Mathias Dodin, Raquel Martinez-Franco, Alain Tuel
Summary: Six-membered ring cyclohexane derivatives with 2 oxygen atoms and 3 oxygen atoms have been used in the synthesis of zeolites omega and ECR-1, with the latter, 1,3,5-trioxane, showing the ability to be released at lower temperatures. The alkalinity of synthesis gels affects the formation of zeolite omega and ECR-1, with 1,3,5-trioxane leading to the gradual replacement of zeolite omega by ECR-1. Monitoring the relative proportion of omega and ECR-1 in different solids can be done through X-ray diffraction and solid-state nuclear magnetic resonance techniques.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Materials Science, Ceramics
Yuting Zhang, Huan Tu, Guoying Zhao, Jingshan Hou, Yufeng Liu, Xin Qiao, Zhongzhi Wang, Bo Li, Ji-Guang Li, Feng Wang, Yongzheng Fang
Summary: Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and enables precise control of emissions. In this study, the coordination field of Ce3+ ion was regulated through co-substitution, resulting in spectrum regulation in the yellow-green range. By using Ba2+-Si4+ cations to replace Y3+-Al3+ cations, the emission peak of the garnet phosphor was blue-shifted from 552 to 539 nm. The fluorescent films prepared using a low-temperature co-sintering process showed less erosion and even dispersion of the fluorescence crystals in the glass matrix. The warm white film prepared has potential application value in the whole spectra field.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Review
Chemistry, Inorganic & Nuclear
Xiaoliang Qi, Yajing Xiang, Erya Cai, Xinxin Ge, Xiaojing Chen, Wei Zhang, Zhangping Li, Jianliang Shen
Summary: The clinical management of bacterial infections has become a global public health challenge. Photothermal therapy (PTT), which uses laser irradiation to kill bacteria, has gained attention due to its low invasiveness and avoidance of drug-resistant bacteria. Inorganic-organic hybrid nanomaterials have shown potential in PTT antibacterial. This review discusses the fabrication strategies, properties, and current status of nanohybrid PTAs, as well as key issues and future developments in this field.
COORDINATION CHEMISTRY REVIEWS
(2023)
Review
Chemistry, Multidisciplinary
Gabriella Salviulo, Maria Cristina Lavagnolo, Manuele Dabala, Enrico Bernardo, Antonino Polimeno, Mauro Sambi, Franco Bonollo, Silvia Gross
Summary: Circular economy is seen as a new opportunity to build a more sustainable world socially and economically. This essay discusses the potential contribution of inorganic chemistry to the smooth transition towards circularity in inorganic materials design and production through an interdisciplinary approach.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Wang Lei, Sun Tantan, Yan Nana, Ma Chao, Liu Xiaona, Tian Peng, Guo Peng, Liu Zhongmin
Summary: The aluminosilicate zeolite SSZ-13 and zeolitic silicoaluminophosphate molecular sieve SAPO-34 are widely used in commercial catalytic applications. Finding suitable OSDAs is important for directing the synthesis of SSZ-13 with specific properties. By using different OSDAs, SSZ-13 molecular sieves with different SARs can be obtained. This work provides new insights for identifying more efficient and commercialized OSDAs for preparing tailored SSZ-13 with specific properties.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)
Article
Chemistry, Applied
Carlos Mendoza, Adriana Echavarria
Summary: In this study, nanosized Y zeolites with high crystallinity and Si/Al ratios between 1.5 and 2.6 were synthesized in a relatively short time (3 days) using a simple, inexpensive, and environmentally friendly method without the use of organic compounds. The research focuses on understanding the effect of the variation in the amount of sodium aluminate, silica, and sodium hydroxide on the crystallization temperature, Si/Al ratio, and particle size of the resulting zeolite.
JOURNAL OF POROUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Peng Lu, Supriya Ghosh, Matheus Dorneles de Mello, Huda Sharbini Kamaluddin, Xinyu Li, Gaurav Kumar, Xuekui Duan, Milinda Abeykoon, J. Anibal Boscoboinik, Liang Qi, Heng Dai, Tianyi Luo, Shaeel Al-Thabaiti, Katabathini Narasimharao, Zaheer Khan, Jeffrey D. Rimer, Alexis T. Bell, Paul Dauenhauer, K. Andre Mkhoyan, Michael Tsapatsis
Summary: A novel pentasil-type zeolite material, named FDP, has been synthesized with ultra-small few-unit-cell crystalline domains, which can be used for producing highly active and selective catalysts. FDP is prepared using a di-quaternary ammonium structure directing agent and can incorporate Al and Sn into its framework to produce catalysts for methanol-to-hydrocarbon and glucose isomerization reactions, respectively. X-ray diffraction analysis and electron microscopy imaging show that FDP has crystalline domains of around 10 nm with hierarchical micro-/meso-porous aggregates exhibiting mesoscopic order.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Fangyan Liu, Biao Wang, Xiaolong Liu
Summary: The understanding of crystallization mechanisms of molecular sieves is driven by their broad range of usefulness and unique properties. The electrostatic interactions between organic structure-directing agents (OSDAs) and the framework, as well as the correlation among OSDAs, play dominant roles in the crystallization process. This fundamental understanding could be valuable for designing and synthesizing new molecular sieves with desirable structural properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Energy & Fuels
Jun-fei He, Zhi-bo Xiong, Yan-ping Du, Wei Lu, Su-le Tian
Summary: The study investigated the morphology effect of tungsten oxide on the NH3-SCR activity of the supported CeO2 catalyst by comparing WO3 in different morphologies. It was found that Ce/W-NP exhibited the best redox ability and NH3-SCR activity, attributed to the highest molar ratio of W5+/(W5++W6+) and Ce4+ concentration on the surface. The use of acidic structure-directing agents in impregnated Ce/W catalysts is crucial for improving the catalytic activity.
JOURNAL OF THE ENERGY INSTITUTE
(2021)
Article
Chemistry, Applied
Haojie Li, Xiaozhe Hou, Ling Zhang, Ying Wei, Yan Liang, Junjun Qiao, Haohao Su, Xibing Gao, Jingbo Jia, Runduo Zhang
Summary: An extra-large-pore aluminogermanosilicate zeolite IRR with interconnected 18 x 12 x 12-ring channels was prepared using a new alkyl-immidazolium template. The zeolite exhibited excellent microporosity and strong acidity after calcination, making it suitable for catalytic reactions. The catalytic activity of IRR zeolite was found to be the highest for bulky substrate diphenylacetaldehyde, due to its open channel system and presence of active acidic sites.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Physical
Yehong Wang, Jiapei Wang, Yuda Zhang, Qiang Guo, Jie An, Yafei Liang, Yanan Wang, Pengfei Cao, Marc Heggen, Rafal E. Dunin-Borkowski, Xiangxue Zhu, Xiujie Li, Feng Wang
Summary: This study reports the application of a Sn-doped catalyst in CO2 oxidative dehydrogenation of propane. By forming PtSn alloy and increasing oxygen vacancy concentration in CeO2 support, propane conversion and propylene selectivity are improved.
Article
Materials Science, Ceramics
Jin Zhang, Chang Dong, Jiale Wang, Dong Xiao, Guangjin Hou, Shanfu Lu, San Ping Jiang
Summary: In this study, a core-shell SnP2O7 (c-SnP2O7) with outstanding proton conductivity was synthesized via a conventional acid method. The c-SnP2O7 consists of a crystalline SnP2O7 inner core, an amorphous phosphate intermediate layer, and a gel-like phosphorous-rich outer layer. The phosphorous-rich gel layer contributes to its excellent proton conductivity of 8.0 x 10-2 S cm-1 at 260 degrees C and durability of 115 h at 240 degrees C under anhydrous conditions. The c-SnP2O7 shows promise as a proton conductor for elevated temperature fuel cells.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Qiang Yu, Junjie Li, Wen Liu, Yanan Wang, Weifeng Chu, Xinbao Zhang, Longya Xu, Xiangxue Zhu, Xiujie Li
Summary: A novel microporous silica-based material (MIS) with abundant micropores and wide range of pore sizes was successfully synthesized using tetrabutylammonium hydroxide (TBAOH). The optimized MIS showed high adsorption capacity for m-xylene and other volatile organic compounds (VOCs), making it a promising adsorbent for VOC removal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yonghui Zhang, Fan Li, Tianyu Li, Mengqi Zhang, Zhizhang Yuan, Guangjin Hou, Jie Fu, Changkun Zhang, Xianfeng Li
Summary: Aqueous organic flow batteries (AOFBs) have advantages over traditional flow batteries and developing stable electrolytes is a challenge. By optimizing the electrolyte and using NMR and EPR techniques, stable molecular structures of methylene blue (MB) electrolyte were discovered, enabling high reversibility under ambient air conditions. A kW-scale AOFB stack assembled with MB electrolyte showed stable capacity and long-life cycle performance, making it a promising candidate for large-scale energy storage.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Applied
Dongpu Zhao, Xiujie Li, Weifeng Chu, Yanan Wang, Wenjie Xin, Chao Feng, Guangjin Hou, Longya Xu, Shenglin Liu, Xiangxue Zhu
Summary: Zeolite Beta nanospheres and hollow-boxes were successfully synthesized using a simple hydrothermal method. The role of NMP changed with the variation of crystallization temperature and TEAOH content. Undesired zeolites may be formed under high synthesis temperature, high Si/ Al ratio, and low TEAOH content. The obtained catalysts exhibited excellent catalytic activity.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Qiong Wu, Jiamin Yuan, Chunmu Guo, Zhenni Liu, Xiujie Li, Zhiqiang Liu, Wei Wang, Wei Wu
Summary: In this study, one-dimensional SAPO-11, SAPO-31, and SAPO-41 with different pore sizes were synthesized and used as supports for Pd catalysts. Molecular dynamics simulation revealed that the diffusion of reactants and intermediates in the micropore channels was strongly affected by the opening size of the channels. The Pd/SAPO-31 catalyst showed the highest activity and yield of iso-hexadecane in the hydroisomerization of n-hexadecane, attributed to improved diffusion and favorable metal-acid balance. Furthermore, it was found that the hydroisomerization over Pd/SAPO-31 occurred via the key lock mechanism, leading to a high proportion of multi-branched iso-hexadecane at high conversion of n-hexadecane. The Pd/SAPO-31 catalyst was proven to be an effective bifunctional catalyst for industrial biodiesel production.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Engineering, Chemical
Wen Liu, Junjie Li, Qiang Yu, Yanan Wang, Weifeng Chu, Yingbin Zheng, Zhiqiang Yang, Xuebin Liu, Xiujie Li, Xiangxue Zhu
Summary: This study developed a direct synthesis route for submicron (500 nm) spherical ZSM-48 zeolite with the assistance of F- ions at low crystallization temperature. Through detailed investigation, a reliable formation mechanism of spherical ZSM-48 zeolite was proposed. The submicron spherical ZSM-48 zeolite showed significantly improved stability and higher selectivity for p-xylene in m-xylene isomerization compared to traditional zeolite.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Inorganic & Nuclear
Yongfa Xie, Teng-Fei Li, Wei Chen, Lixin Liang, Hui-Peng Lv, Qing Liu, Yin-Shan Meng, Guangjin Hou, Hu Cai
Summary: Three stable supramolecular radicals with ferroelectric phase transitions and bistability in dielectric property and second-harmonic generation effect were synthesized and characterized. The ferroelectric transition and bistable properties are generated from a net polar crystal structure and a distinctive symmetric scissoring motion of the radicals, respectively. These results pave the way for designing bistable optoelectronic radical materials with magnetic bistability in the future.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Yanxin Liu, Xinyue Sheng, Kongying Zhu, Xia Li, Xinlong Yao, Guangjin Hou, Jun Xu
Summary: A new method is reported here to achieve high-resolution characterization of hydrogen in hydrous materials using 1D and 2D 1H solid-state NMR experiments. By combining MAS NMR, moderate 2H substitution, and high magnetic fields, chemically similar but crystallographically distinct hydrogen sites in a prototypical hydrous material LYH-Br were successfully identified. This advance provides a powerful tool for studying multiple hydrous species in hydrous materials and obtaining previously inaccessible fine structural information.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Zhili Wang, Dong Xiao, Kuizhi Chen, Caiyi Lou, Lixin Liang, Shutao Xu, Guangjin Hou
Summary: Increasing research has revealed the complexity of active sites in zeolite catalysts, making it challenging to effectively characterize them, especially for a molecular-level understanding. Trimethylphosphine (TMP) is found to have strong catalytic meanings as proven by NMR-assisted 31P-27Al internuclear distance measurement and comprehensive 2D heteronuclear correlation (HETCOR) NMR experiments. The TMP-binding site is identified as special Al-OH groups, originating from partially bonded framework Al(IV)-2 species.
Article
Chemistry, Physical
Zhenchao Zhao, Xinlong Yao, Guangjin Hou
Summary: In this study, in situ high-pressure MAS NMR rotors were developed to investigate the reaction pathways of methanol reforming over Pt/a-MoC catalysts. The results showed that, besides direct decomposition of methanol, formaldehyde is also an active intermediate that reacts with methanol or H2O and further transforms into methyl formate or formic acid. CO2 and H2 production mainly occurs through a formic acid mediated mechanism.
Article
Chemistry, Multidisciplinary
Qiao Han, Pan Gao, Kuizhi Chen, Lixin Liang, Zhenchao Zhao, Xinlong Yao, Dong Xiao, Xiuwen Han, Guangjin Hou
Summary: Efficiency improvement in the oxide-zeolite bifunctional syngas-to-hydrocarbon catalysis requires a deep understanding of the reaction mechanism, especially for the poor initial syn-gas conversion over the oxide component. Through advanced solid-state NMR technologies, specific surface dual active sites for syngas activation were identified, and the dynamic evolution of reaction intermediates and active sites during the reaction process were elucidated at the atomic level. The in-depth understanding of the catalytic mechanism will aid in the rational design of high-performance catalysts for syngas conversion.
Article
Engineering, Environmental
Guangjun Ji, Cunyao Li, Pan Gao, Miao Jiang, Lei Ma, Guoqing Wang, Guangjin Hou, Li Yan, Yunjie Ding
Summary: Tuning the microenvironment surrounding single atom metals is an effective strategy to regulate the performance of single atom catalysts (SACs). In this study, P, N-abundant porous organic polymers (P & N-POPs) were prepared as carriers of SACs, and the microenvironment surrounding Rh and the equilibrium of active species were effectively regulated in Rh/P & N-POPs catalysts. The confinement of specific active species in the flexible polymeric skeleton endowed the catalyst with superior activity, selectivity, stability, and substrate applicability in hydroformylation reactions.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jun Mao, Huan Liu, Xiaoju Cui, Yunlong Zhang, Xiangyu Meng, Yanping Zheng, Mingshu Chen, Yang Pan, Zhenchao Zhao, Guangjin Hou, Jingting Hu, Yanan Li, Guilan Xu, Rui Huang, Liang Yu, Dehui Deng
Summary: This study reports an artificial process for the direct conversion of methane to C1 oxygenates at low temperature using an edge-rich MoS2 catalyst. The catalyst exhibits high conversion rate and selectivity in converting methane to valuable chemicals at 25 degrees C.
Article
Engineering, Chemical
Yanli Wang, Hong Yang, Guangjin Hou, Bosong Zhang, Zhaochi Feng, Xinwen Guo, Can Li
Summary: In this study, post-treated Al-TS-1 catalysts were prepared through hydrothermal post-treatments, which showed higher H2O2 conversion in the HPEG process compared to the parent Al-TS-1. The post-treatment also affected the location and amount of framework Al species in the catalyst, but had minor impact on the EG selectivity.
CHEMICAL ENGINEERING SCIENCE
(2023)
