Article
Energy & Fuels
Linjie Guan, Meiyu Liu, Honghai Liu, Li Zhang, Yiming Zhang, Yucai Qin, Binbin He, Yi Mei, Yun Zu
Summary: ZSM-5 zeolites with controlled AlF distributions were synthesized by tuning the combinations of PET, TPA, and Na cations. The enriched AlF atoms in HZ5-[PET + Na] and HZ5-[TPA] were beneficial for the n-butane monomolecular reaction pathway, promoting the production of propylene. The AlF atoms in HZ5-[TPA + Na] were simultaneously distributed in both straight and intersection channels, leading to the generation of carbonium ions in the straight channels and inducing bimolecular reactions in the intersection channels, favoring the formation of ethylene. These findings provide insights into the catalytic behavior of regional framework acid sites in ZSM-5 channels and offer an effective approach for designing efficient TCO catalysts.
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, Physical
Zhen Chen, Lingjuan Wang, Richuan Rao, Yueming Liu, Haiping Zou
Summary: Controlling the distribution of aluminum atoms in the ZSM-5 zeolite framework can effectively modulate the product selectivity for methanol-to-olefin (MTO) reaction.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Applied
Qintong Huang, Ningyue Chen, Mengyun Wen, Weichi Liang, Rui Li, Yukai Zhao, Zhifeng Zeng, Chuanqi Zhang, Jiuxing Jiang
Summary: The aluminosilicate form of ITQ-58 can be directly synthesized using Si/B-ITQ-58 zeolite as seed, exhibiting excellent properties for use as a heterogeneous catalyst in the Biginelli reaction. This method confirms the new function of seed-assisted synthesis in preparing aluminosilicates.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Zhu Jin, Yifeng Liu, Liang Wang, Chengtao Wang, Zhiyi Wu, Qiuyan Zhu, Lingxiang Wang, Feng-Shou Xiao
Summary: In this study, AuPd nanoparticles fixed within aluminosilicate zeolite crystals were used as catalysts for the direct synthesis of H2O2 in aqueous solution. The zeolite-assisted proton transfer process catalyzed the oxygen hydrogenation to form H2O2, leading to high productivity and selectivity of H2O2 in water. The findings highlight the potential of zeolite fixed structures for designing efficient catalysts in H2O2 synthesis.
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
Chemistry, Multidisciplinary
Jie Tuo, Yaqi Fan, Yan Wang, Yudan Gong, Chengwei Zhai, Xianchen Gong, Teng Yang, Hao Xu, Jingang Jiang, Yejun Guan, Yanhang Ma, Peng Wu
Summary: Selective conversion of syngas to value-added olefins is a topic of significant research interest. The combination of the pentasil zeolite Al-IDM-1 with ZnaAlbOx oxide shows high selectivity and ratios, making it a promising catalyst for the production of propylene and butene.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Applied
Haimei Xu, Peng Lu, Guangying Fu, Jifa Miao, Jiaqi Zhao, Ruiqin Ding, Lei Zhao, Zhirong Lang, Xiaobo Yang, Valentin Valtchev
Summary: The zeolite community successfully synthesized high-silica LTA-type zeolites after 50 years of research, and found strong interactions between organic structure-directing agents and the framework. Removing the structure-directing agents is difficult and can only be done at high temperatures.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yuxuan Huang, Hongfang Ma, Zhiqiang Xu, Weixin Qian, Haitao Zhang, Weiyong Ying
Summary: SAPO-18 showed stable catalytic performance with high selectivity to light olefins, while SAPO-35 quickly deactivated due to the formation of heavy coke deposits, leading to unsustainable catalytic performance.
Article
Chemistry, Applied
Hao Xu, Jie Zhu, Jun Qiao, Xiyuan Yu, Na-Bo Sun, Chaoqun Bian, Jie Li, Longfeng Zhu
Summary: A solvent-free synthesis method for aluminosilicate SSZ-39 zeolite using DMDMP as an organic structure-directing agent is reported for the first time. The zeolite exhibits excellent catalytic performance in NH3-SCR reaction with high crystallinity, uniform morphology, large surface area, and strong acidic sites. The method shows advantages such as high product yield, simple synthesis procedures, and reduction of pollutants.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Applied
Jun Liang, Xiangcheng Li, Chuang Liu, Zhangping Shi, Yu Wang, Wenhua Fu, Zhiqing Yuan, Zhendong Wang, Weimin Yang
Summary: A new zeolite, SCM-39, has been successfully synthesized directly as the first aluminosilicate analog of ATS-type zeolite. SCM-39 exhibits excellent hydrothermal stability and abundant acid sites, and shows superior catalytic performances in the disproportionation of toluene and self-condensation of cyclohexanone compared to MOR zeolite.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Shanfan Lin, Yuchun Zhi, Zhiqiang Liu, Jiamin Yuan, Wenjuan Liu, Wenna Zhang, Zhaochao Xu, Anmin Zheng, Yingxu Wei, Zhongmin Liu
Summary: This study reveals the multiscale dynamical cross-talk in zeolite-catalyzed methanol and dimethyl ether conversions, emphasizing the importance of optimal spatiotemporal cooperation of diffusion-reaction-material for zeolite catalysis and process application. The research provides a comprehensive understanding of the dynamical diffusion and reaction process, crucial for zeolite shape-selective catalysis, and urgently demanded in academia and industry.
NATIONAL SCIENCE REVIEW
(2022)
Article
Chemistry, Multidisciplinary
Xueshuai Chen, Rongli Jiang, Huilin Hou, Zihan Zhou, Xingwen Wang
Summary: This study synthesized an Mg-incorporated ZSM-5 zeolite with superior catalytic properties directly from laponite and tetraethylorthosilicate as raw materials via hydrothermal method. The ZSM-5 synthesized from laponite exhibited unique aggregated spherical morphology composed of sheet-like crystals, facilitated by depolymerized laponite acting as crystalline seeds. Furthermore, the Mg species in laponite entered into the ZSM-5 zeolite during crystallization, resulting in better catalytic performance for MTO reaction compared to ZSM-5(0) synthesized from TEOS as a single Si source.
Article
Engineering, Environmental
Jingyan Zhang, Peng Ji, Li Ren, Yuhong Zhao, Shiqing Li, Hao Xu, Honggen Peng, Jin-Gang Jiang, Yejun Guan, Peng Wu
Summary: The small-pore CHA-type zeolites are highly regarded for their excellent performance in the methanol-to-olefin (MTO) process and ammonia selective catalytic reduction of nitrogen oxides (NH3-SCR of NOx) reactions. This study successfully synthesized CHA-type zeolites (named as ECNU-25) using a novel and affordable organic structure-directing agent, with boric acid as the supporting agent. The synthesized [Al, B]-ECNU-25 zeolite exhibited effective catalytic activity in the MTO reaction and showed high activity in the NH3-SCR of NOx after Cu2+ exchange.
CHEMICAL ENGINEERING JOURNAL
(2022)
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
Chemistry, Inorganic & Nuclear
Akira Imaizumi, Akinobu Nakada, Takeshi Matsumoto, Toshiyuki Yokoi, Ho-Chol Chang
Summary: This study demonstrates a simple thermal synthesis of porous aluminosilicates from a single-source spiro-7-type molecular precursor. The synthesized aluminosilicates show low carbon content, large surface area, and improved catalytic activity.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Junko N. Kondo, Shuo Ge, Tomohiro Suzuki, Ryota Osuga, Takeshi Matsumoto, Toshiyuki Yokoi, Yugo Shimizu, Atsushi Fukazawa, Naoki Shida, Mahito Atobe
Summary: For the first time, on-top hydrogen on a Pd cathode (Pd-H) was observed using operando infrared spectroscopy, and it was found to be stabilized by co-adsorbed solvent molecules. The spectroscopic analysis also revealed changes in the solvent's spectra when Pd-H species were present.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Atikhun Chottiratanachote, Manaswee Suttipong, Umer Rashid, Vudhichai Parasuk, Junko Nomura Kondo, Toshiyuki Yokoi, Ali Alsalme, Chawalit Ngamcharussrivichai
Summary: This study aims to synthesize alpha,beta-unsaturated carbonyl compounds with branched structures via aldol condensation of furfural and 2-butanone using MgAl mixed oxides as catalysts. The most suitable catalyst is LDO3 with a 3:1 Mg:Al atomic ratio. The suitable reaction conditions to produce the branched-chain C9 ketones are 1:5 furfural:2-butanone molar ratio, 5 wt.% catalyst loading, 120 degrees C reaction temperature, and 8 h reaction time.
Article
Chemistry, Physical
Tomoki Kanazawa, Shunta Nishioka, Shuhei Yasuda, Daichi Kato, Toshiyuki Yokoi, Shunsuke Nozawa, Hiroshi Kageyama, Kazuhiko Maeda
Summary: The local structure dependence of BaTiO3-xHx on the doped H- amount was investigated using Raman and X-ray absorption fine-structure (XAFS) spectroscopy measurements. It was found that the tetragonal phase transforms into the cubic phase when the doped H- amount is relatively large (x ≥ 0.2). XAFS measurements revealed that the TiO6 octahedral symmetry in BaTiO3-xHx is strongly affected by the doped H- amount, where an increase of H- relaxes the local distortion of the Ti [111] displacement and causes the tetragonal-to-cubic structural change.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Nuttapat Thiensuwan, Sivashunmugam Sankaranarayanan, Toshiyuki Yokoi, Chawalit Ngamcharussrivichai
Summary: The Ru-based nanocomposites supported on exfoliated MgAl-double oxides were investigated for the catalytic oxidation of HMF to FDCA. The exfoliated LDO-supported Ru catalysts showed enhanced textural properties, RuO x dispersion, and basicity, resulting in better catalytic activity. Among them, Ru(3)/ESV-LDC catalyst exhibited good reusability without significant loss of HMF conversion and FDCA yield.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Bernd Marler, Hermann Gies, Trees De Baerdemaeker, Ulrich Mueller, Andrei-Nicolae Parvulescu, Weiping Zhang, Toshiyuki Yokoi, Feng-Shou Xiao, Xiangju Meng, Dirk De Vos, Ute Kolb
Summary: A new zeolite, COE-11, was synthesized through hydrothermal synthesis and characterized as a microporous borosilicate zeolite with a 2D pore system. It has a close structural relationship with zeolite beta polymorph B but differs in pore system dimensionality.
CHEMISTRY-SWITZERLAND
(2023)
Article
Biochemistry & Molecular Biology
Kamolwan Jermjun, Rujeeluk Khumho, Mookarin Thongoiam, Satit Yousatit, Toshiyuki Yokoi, Chawalit Ngamcharussrivichai, Sakdinun Nuntang
Summary: In this study, natural rubber/hexagonal mesoporous silica (NR/HMS) nanocomposites were synthesized and used as selective adsorbents to separate EGCG and CAF from green tea. The NR/HMS materials showed high adsorption capacity for EGCG and could be reused multiple times. This research suggests the potential use of NR/HMS nanocomposites for enriching EGCG in green tea and reducing CAF content. Rating: 8/10.
Article
Chemistry, Multidisciplinary
Akinobu Miyoshi, Megumi Okazaki, Kosaku Kato, Tomoki Kanazawa, Toshiyuki Yokoi, Shunta Nishioka, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda
Summary: The development of a photocatalyst capable of evolving H-2 from water under visible light is important. Pd was found to be the best-performing cocatalyst for TiO2:N,F under UV-vis irradiation. However, under visible-light irradiation, the activity of Pd/TiO2:N,F for H-2 evolution was negligibly small.
Article
Materials Science, Multidisciplinary
Kenta Aihara, Ryusuke Mizuochi, Megumi Okazaki, Shunta Nishioka, Shuhei Yasuda, Toshiyuki Yokoi, Fumitaka Ishiwari, Akinori Saeki, Miki Inada, Kazuhiko Maeda
Summary: Mixed-anion compounds are difficult to synthesize compared to ordinary single-anion counterparts, but they have great potential as visible-light-driven photocatalysts. In this study, Pb2Ti2O5.4F1.2 particles with a well-defined octahedral shape were successfully synthesized by a microwave-assisted hydrothermal (MHT) method at 473 K. The MHT-Pb2Ti2O5.4F1.2 showed improved activity for visible-light H-2 evolution compared to its analogue synthesized by a conventional solid-state reaction (SSR). A postheating treatment further enhanced its activity, and the optimized MHT-Pb2Ti2O5.4F1.2 achieved nonsacrificial H-2 evolution in the presence of a reversible electron donor.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
Peipei Xiao, Yong Wang, Kengo Nakamura, Yao Lu, Junko N. Kondo, Hermann Gies, Toshiyuki Yokoi
Summary: In this study, a strategy to reduce the thickness along the c-axis of AEI-type zeolite crystals was adopted to improve the catalytic properties and stability in the direct oxidation of methane to methanol. The sheet-like Cu-exchanged AEI zeolite exhibited better performance compared to the typical cubic-shaped zeolite. This was attributed to the decreased straight channel length, which facilitated reactant and product diffusion and suppressed the secondary reaction of methanol to olefins.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mizuho Yabushita, Ryota Osuga, Toshiyuki Yokoi, Atsushi Muramatsu
Summary: Oxidative upgrading of methane into valuable products can be achieved at low temperatures over zeolite-based catalysts. The unique tunability provided by zeolite framework structures enables the design of active species, resulting in excellent catalytic performance. This article categorizes the active species in zeolite-based catalysts into three groups and provides a comprehensive overview of their performance, structure, and catalysis.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Yuta Shiroma, Hiroto Mogi, Takeaki Mashiko, Shuhei Yasuda, Shunta Nishioka, Toshiyuki Yokoi, Shintaro Ida, Koji Kimoto, Kazuhiko Maeda
Summary: Modification of the interlayer nanospaces of lamellar solids can enhance their physical properties and chemical functions. In this study, the interlayer of a layered perovskite oxynitride was modified by H+/K+ exchange, ethylamine intercalation, and exfoliation-restacking. The ethylamine intercalated specimen showed significantly improved photocatalytic H-2 evolution activity, while the restacked nanosheets exhibited decreased activity. These findings suggest that ethylamine intercalation provided suitable interlayer nanospaces for Pt cocatalyst loading, promoting the photocatalytic reaction.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Daniele Padovan, Koichiro Endo, Takeshi Matsumoto, Toshiyuki Yokoi, Atsushi Fukuoka, Hideki Kato, Kiyotaka Nakajima
Summary: The acid-base properties of amphoteric crystalline YNbO4 are adjusted by impregnating phosphate groups, resulting in materials with increased activity and selectivity in glucose dehydration. The introduction of phosphate groups leads to the optimal catalyst, 5P-YNbO4, which exhibits 50% selectivity at 75% conversion. The catalyst can be deactivated due to carbon deposits, but its activity can be completely recovered through washing and calcination.
Article
Chemistry, Multidisciplinary
Ryota Osuga, Mizuho Yabushita, Takeshi Matsumoto, Masato Sawada, Toshiyuki Yokoi, Kiyoshi Kanie, Atsushi Muramatsu
Summary: High-silica CHA-type aluminosilicates were synthesized hydrothermally in the absence of fluoride media, with the seed-assisted aging treatment playing a crucial role in the crystallization. These aluminosilicates exhibited a long catalytic lifetime and high selectivity towards lower olefins in the methanol-to-olefins reaction.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Masanori Takemoto, Kenta Iyoki, Yuki Otsuka, Hiroaki Onozuka, Anand Chokkalingam, Toshiyuki Yokoi, Susumu Tsutsuminai, Takahiko Takewaki, Toru Wakahira, Tatsuya Okubo
Summary: This study demonstrates the remarkably prolonged lifetime of a CON-type zeolite in methanol-to-olefins reaction via a multistep strategy including post-milling recrystallisation and liquid-mediated healing of residual defects. The defect-healed zeolite nanoparticles showed a lifetime more than twice that of the parent zeolite owing to the increased external surface area and the reduced subnano-scale defects. This protocol could play a significant role in designing robust catalysts with controlled particle sizes and reduced subnano-scale defects.
MATERIALS ADVANCES
(2022)