Article
Chemistry, Physical
Lingfeng Yu, Chong Xu, Qi Zhou, Xuan Fu, Yu Liang, Wei Wang
Summary: In this study, hierarchical porous ZSM-5 zeolites were successfully synthesized using fumed silica and as-synthesized mesoporous silica nanoparticles as dual-silica source with the aid of silicate-1 seed. The effects of the amounts of silicate-1 seed and as-synthesized MSNs on the crystallinity, morphology, mesoporous structure and acidity of the prepared ZSM-5 zeolites were investigated. The results showed that the introduction of as-synthesized MSNs can incorporate mesopores, promote crystallization, and regulate the mesoporous structure of ZSM-5 zeolites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Son Dong, Houqian Li, Iris K. Bloede, Abdullah J. Al Abdulghani, Edgard A. Lebron-Rodriguez, George W. Huber, Ive Hermans
Summary: The catalytic conversion of model compounds for plastic pyrolysis oil (1-octene, octadiene, octane, and toluene) over ZSM-5 in a fixed-bed reactor was investigated mechanistically. The conversion of 1-octene resulted in the production of benzene, toluene, xylene, coke, and hydrogen through a series of cracking, oligomerization, cyclization, and hydrogen transfer reactions. Octadiene mainly contributed to reactor fouling through thermal coking, while octane and toluene were converted through cracking reactions and disproportionation, dealkylation, and coking reactions, respectively. The use of mesoporous ZSM-5 maintained product selectivity for 70 hours in time-on-stream experiments.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Thermodynamics
Haoran Sun, Zhongyang Luo, Wenbo Wang, Simin Li, Shuang Xue
Summary: In this study, the impact of mesoporous structure parameters on the diffusion of heavy phenols and the regulation of pyrolysis products in cellulolytic enzyme lignin catalytic conversion was investigated. A micromesostructured composite zeolite (ZMA) with internal hierarchical pores and ununiform mesolayer shell was found to have the most suitable mesostructure for the process, showing improved accessibility of inner acidic sites and providing a balance between aromatic yield and product distribution. Additionally, different mesostructures required varied applicable catalyst to lignin ratios, with ZMA and hierarchical samples suitable for higher and lower ratios, respectively.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Chemistry, Physical
Md M. Hasan, Nuno Batalha, Gabriel Fraga, Mohamed H. M. Ahmed, L. Pinard, Muxina Konarova, Steven Pratt, Bronwyn Laycock
Summary: Catalytic pyrolysis of plastic waste offers an economical and efficient way to convert plastic waste into high-quality products. The experiment showed that different zeolite catalysts have different effects on the conversion mechanism of plastic waste. The polymer structures and secondary reactions play important roles in product distribution, while the physicochemical properties and coke composition of zeolite catalysts are related to their deactivation processes.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Multidisciplinary
Shinya Kokuryo, Koji Miyake, Yoshiaki Uchida, Shunsuke Tanaka, Manabu Miyamoto, Yasunori Oumi, Atsushi Mizusawa, Tadashi Kubo, Norikazu Nishiyama
Summary: Plastic waste is causing severe environmental problems, and catalytic cracking is a promising solution. This study successfully synthesized a Zr- and Al-incorporated Beta zeolite catalyst, which showed enhanced efficiency in decomposing plastic waste. The findings contribute to the practical application of plastic waste treatment.
Article
Chemistry, Physical
Lei Wu, Caixia Qi, Xun Sun, Huijuan Su, Libo Sun, Lijun Zhao, Fengshou Xiao
Summary: In this study, the catalytic cracking performance of n-octane at low temperatures was significantly improved by utilizing a combination of dealumination and Au species on Au/ZSM-5 catalysts. This resulted in lower reaction temperatures, higher energy efficiency, and improved environmental friendliness.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Applied
Fanyong Meng, Lin Sun, Runwei Wang, Sen Lin
Summary: A series of Ga-MFI zeolites were synthesized using a seed-assisted strategy without additional organic template. The synthesis parameters were investigated to understand the framework fabrication, morphology evolution, and gallium incorporation. The cost of tetrapropylammonium hydroxide (TPA+) was significantly reduced through the use of Si/Ga seed. Crystallization temperature and pre-aging conditions played key roles, and the addition of mineralizer and surfactant controlled morphology and gallium concentration.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Hagos Birhane Asfha, Ashenafi Hailu Berta, Nayoung Kang, Danim Yun, Jaedeuk Park, Yong-Ki Park, Kiwoong Kim
Summary: In this study, a reaction mechanism of light straight run naphtha cracking over micro-spherical catalyst containing HZSM-5 was systematically investigated. The results showed that light paraffins and olefins were the primary products, and oligomerization and β-scission cracking dominated the secondary reactions. Experiments on single hydrocarbon feeds indicated that BTX formation proceeded via the formation of cycloalkanes and cyclo-olefinic intermediates. Temperature and space time influenced the product selectivity, with propylene selectivity increasing at lower temperatures and ethylene selectivity increasing at higher temperatures.
Article
Engineering, Environmental
Leilei Dai, Hailong Zhao, Nan Zhou, Kirk Cobb, Paul Chen, Yanling Cheng, Hanwu Lei, Rongge Zou, Yunpu Wang, Roger Ruan
Summary: Catalytic cracking of plastics into naphtha as a substitute for new plastic production has the potential to contribute to the plastic circular economy. By utilizing hierarchical ZSM-5 catalysts, a significant improvement (4.3 x to 12.3 x) in catalyst lifetime has been achieved compared to conventional analogues. Increasing the Bronsted acid concentration enhances catalyst lifetime and boosts cumulative aromatic selectivity, resulting in economic benefits and reduced environmental impact.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Materials Science, Multidisciplinary
Maryam Haghighi, Soodabeh Bakhshi, Somayeh Gooneh-Farahani
Summary: Different catalysts based on ZSM-5 and ZSM-11 zeolites were synthesized using tetra-n-butyl ammonium bromide and 1,2-phenylenediamine as organic solid directing agents. The results showed that 1,2-phenylenediamine efficiently promoted the catalyst performance. Characterization of the synthesized catalysts was done using X-ray diffraction, SEM, and EDX, and their catalytic activity in tetradecane cracking was studied, with TiO2, CeO2, and butanol showing improvement in conversion rates and product yields. The highest conversion rate of about 53.4% was achieved by CeO2-ZSM-5 at a tetradecane to butanol mass ratio of 10/3.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Chemistry, Applied
Fengqiu Chen, Jing Hao, Yueyang Yu, Dang-guo Cheng, Xiaoli Zhan
Summary: Hierarchical ZSM-5 zeolites with similar porous structures but different external acid strength were prepared through chemical vapor deposition (CVD) method. The results show that the external environment and micropores have different catalytic roles, and the weakening of acid strength is beneficial for suppressing specific reactions.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Engineering, Chemical
Samira Rahimi, Mohammad Rostamizadeh
Summary: In this study, catalytic cracking of plastic was carried out over multi-functional zeolite nanocatalysts with different loadings of Fe promoter. It was found that 5 wt.% Fe promoter resulted in the best product distribution in gasoline range hydrocarbons. The nanocatalyst showed low coke tendency and high potential of reusability.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Chemistry, Multidisciplinary
Hui Tian, Shuai Liu, Qing Liu
Summary: This study investigates a three-phase reaction system of cyclohexene hydration, where the hydrophilic catalyst is located at the bottom of the water phase. It is found that the low conversion of cyclohexene is due to the difficulty of contact with the oil phase. By acid and alkylation modification, the HCl-OTS-HZSM-5 catalyst is prepared and successfully increases the conversion rate of cyclohexene. Simulation results validate the theoretical findings.
Review
Chemistry, Multidisciplinary
Yuchen Sha, Lei Han, Ruoyu Wang, Peng Wang, Haitao Song
Summary: In recent decades, steam cracking of hydrocarbons has been the major process for producing light olefins. Recent studies have shown that modified ZSM-5 zeolite can be used for hydrocarbon cracking to produce significant amounts of propylene and ethylene. Various modification methods and post-treatment techniques have been employed to improve the catalytic performance of ZSM-5 zeolite.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Applied
Jiale Zhu, Siyan Yan, Yuan Qian, Xuedong Zhu, Fan Yang
Summary: A novel fluffy-ball like ZSM-5 zeolite was synthesized by biphasic hydrothermal method and exhibited improved physicochemical properties and catalytic performance in hexane cracking reaction. The fluffy-ball like ZSM-5 possessed uniform morphology and higher pore volumes, leading to enhanced diffusion efficiency and suppressed side reactions. The catalyst demonstrated higher selectivities to light olefins and improved stability compared to conventional ZSM-5.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
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)