Article
Energy & Fuels
Duangkamon Suttipat, Kachaporn Saenluang, Wannaruedee Wannapakdee, Pannida Dugkhuntod, Marisa Ketkaew, Peerapol Pornsetmetakul, Chularat Wattanakit
Summary: In this study, zeolite nanosheet composites consisting of ZSM-5 and Silicalite-1 nanosheets were successfully fabricated with adjustable shell thickness, structure, and acidity through hydrothermal synthesis. The composites exhibit highly selective production of propylene in MTO process and significantly lower coke formation, showing great potential for the development of hierarchical zeolite composites in selective light olefin production.
Article
Chemistry, Inorganic & Nuclear
Zihan Zhou, Rongli Jiang, Xueshuai Chen, Xingwen Wang, Huilin Hou
Summary: This paper successfully synthesized a hierarchical lamellar H-ZSM-5 zeolite with excellent catalytic performance for methanol to olefin conversion, using urea and PEG2000 as synthesis materials, providing an energy-efficient and eco-friendly synthesis strategy.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Energy & Fuels
Bachcha Lal, Dan Bahadur Pal, Amit Kumar Rathoure, Arvind Singh
Summary: Addition of kaolin and silver to HZSM-5 zeolite affects its acidity and catalytic activity, with kaolin significantly reducing acidity and silver increasing selectivity for olefins.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Physical
Marie-Elisabeth M. L. Lissens, Pedro S. F. Mendes, Tingjun Lei, Maarten K. Sabbe, Joris W. Thybaut
Summary: The various reaction regimes in methanol to hydrocarbon conversion were experimentally assessed. A dynamic behavior was observed at low oxygenate conversion and low temperature, while increasing the temperature could bring the reaction to a steady-state regime. Further temperature increase resulted in deactivation.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Applied
Sen Wang, Zhikai Li, Zhangfeng Qin, Mei Dong, Junfen Li, Weibin Fan, Jianguo Wang
Summary: The catalytic performance of H-ZSM-5 zeolite for methanol-to-olefins conversion can be properly regulated by altering the distribution of acid sites within the zeolite framework, particularly the location of Al. Specifically, aromatic cycle and aromatization process preferentially occur at acid sites in the intersection cavities, while polymethylbenzene formation is suppressed at acid sites in the sinusoidal and straight channels. The alkene cycle, on the other hand, can take place at all three types of acid sites with similar energy barriers and probabilities.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Philipp Huber, Philipp N. Plessow
Summary: This study investigates the decarboxylation pathways during the methanol-to-olefins process and finds that they are equally likely as the previously computed decarbonylation mechanisms. The barriers for methylation and decarbonylation reactions differ in different zeolite catalysts, while decarboxylation reactions of lactones could explain the formation of carbon dioxide observed in experiments.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Applied
Kai Yuan, Xiangyu Jia, Sen Wang, Sheng Fan, Shipei He, Pengfei Wang, Zhangfeng Qin, Mei Dong, Weibin Fan, Jianguo Wang
Summary: Purposefully regulating the spatial distribution of acid sites in a zeolite catalyst can effectively enhance its performance in the conversion of methanol to olefins (MTO). The use of different sodium halides in the synthesis of ZSM-11 zeolites was found to influence the location and distribution of acid sites, which in turn affected the catalytic performance in MTO. The presence of Br- or I- anions in the synthesis gel led to a uniform distribution of Al species and improved catalytic stability and selectivity in MTO.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Zhihong Li, Yuanshuai Liu, Tao Dou, Xiaofeng Li, Chunyu Di, Sheng-Li Chen
Summary: A synthetic strategy for the effective recycling of mother liquors produced from industrial production of SAPO-34 zeolites is reported. By using vapor-phase-transport method, spray-dried mother liquors with added Si, P and Al were converted to crystal seeds, leading to the acquisition of zeolite products with improved porosity and acidity. The topological structures of the zeolites significantly depended on the crystalline phase of the vapor-phase-transport seeds. The as-synthesized zeolites showed enhanced catalytic performance in methanol-to-olefins reactions compared to conventional hydrothermal synthesized zeolites.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Environmental
Xinyu He, Yajie Tian, Congzhen Qiao, Guozhu Liu
Summary: Nanocrystalline ZSM-5 aggregates catalysts with preserved micropores and newly generated intercrystalline mesopores enhance the conversion rate and selectivity of light olefins.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Huaiqing An, Hua Li, Jibin Zhou, Jinling Zhang, Tao Zhang, Mao Ye, Zhongmin Liu
Summary: This study investigated the kinetics of steam regeneration of spent SAPO-34 catalyst, showing that increasing regeneration temperature can improve catalyst performance and prolong its lifetime. Within an appropriate temperature range, steam regeneration can alter the composition of residual coke on the catalyst, promoting the production of light olefins.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Applied
Shiying Li, Huanhuan Yang, Sen Wang, Mei Dong, Jianguo Wang, Weibin Fan
Summary: Hierarchical macro/microporous ZSM-5 zeolite synthesized from silica spheres showed improved catalytic performance in methanol to olefins reaction due to enhanced diffusion, reduced coke deposition, and increased production of propene and butene through alkene cycle contribution.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Materials Science, Ceramics
Hanie Karimi, Jafar Towfighi, Sahar Akhgar
Summary: Hierarchical porous zeolites with mesoporosity introduced by PEG showed improved catalytic performance in the MTO reaction, with a direct relation between mesopores and PEG molecular weight affecting diffusion pathways and acidity. The tuned SAPO-34 catalysts demonstrated enhanced stability and selectivity to light olefins, particularly propylene and total butylene, in comparison to their parent and other modified counterparts.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
S. Hadi Alaei, Farhad Khorasheh, M. Reza Jafari Nasr, Mehdi Arjmand
Summary: Extensive experimental data were used to develop a comprehensive kinetic model for the methanol to propylene (MTP) process over a ZSM-5 catalyst. Preliminary experiments were performed to determine the reaction conditions that would ensure the absence of external and internal mass transfer resistances. The kinetic experiments were subsequently carried out at 420-500 degrees C under conditions where mass transfer limitations were absent. A detailed reaction network was proposed for the MTP process based on the experimental product distribution and various reported kinetic models in the literature.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zishen Wang, Xiao-Fang Chen
Summary: Methanol adsorption in HSAPO-34 was investigated using periodic density functional theory, revealing that methanol can adsorb on the Bro?nsted acid site via hydrogen bonding or protonation. The adsorption configurations coexist and vary slightly within the channel.
CHEMICAL PHYSICS LETTERS
(2021)
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
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)