Article
Engineering, Chemical
Yu-Ling Zhang, Xue-Gang Li, Wen-De Xiao
Summary: This study investigates the transformation mechanism of C3-C6 olefins on SAPO-34 catalyst without methanol co-feeding. A reaction network is constructed and validated, providing accurate predictions of product distribution.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Chemistry, Physical
Babalola Aisosa Oni, Samuel Eshorame Sanni, Anayo Jerome Ibegbu
Summary: In this study, Y2O3/Fe-Co-SAPO-34 composite catalyst was synthesized using hydrothermal coating and physical blending procedures for the direct conversion of CO2 to light olefins. The resulting catalyst exhibited high selectivity and stability for the production of light olefins.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Multidisciplinary Sciences
Boyuan Shen, Xiao Chen, Xiaoyu Fan, Hao Xiong, Huiqiu Wang, Weizhong Qian, Yao Wang, Fei Wei
Summary: The micro-structures of zeolite catalysts have significant impact on their macroarchitectures and catalytic performances. By atomically resolving SAPO-34 and SAPO-18 zeolites, the correlation between structure and properties is revealed for enhancing their performances in methanol conversion. The real-space imaging of atomic lattices in different SAPO-34/18 intergrowth catalysts provides insights into improving catalytic activities based on unique architectures.
NATURE COMMUNICATIONS
(2021)
Article
Biochemical Research Methods
Sajjad Rimaz, Reza Katal
Summary: In this study, SAPO-34 particles were synthesized using different methods, with the DG conversion method showing enhanced catalytic performance. Using CNT in the synthesis procedure further reduces particle size and results in a hierarchical structure, significantly improving catalytic performance.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Chemistry, Multidisciplinary
Shinya Kokuryo, Kazuya Tamura, Koji Miyake, Yoshiaki Uchida, Atsushi Mizusawa, Tadashi Kubo, Norikazu Nishiyama
Summary: Zr-doped SAPO-34 was synthesized to enhance the catalytic activity, highlighting the significance of Lewis acidity. The highly-dispersed Zr species in Zr-doped SAPO-34 contributed to the higher catalytic activity compared to pristine or Zr-loaded SAPO-34, indicating the strong impact of highly-dispersed Zr species on the performance of SAPO-34.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Applied
Baorong Wang, Peixin Rui, Xinheng Cai, Xianqing Xie, Weilin Liao, Yibin Luo, Xingtian Shu
Summary: This study investigates the co-feeding of methanol from stripper units to enhance the ethylene selectivity in the conventional FCC process. The results show that the use of SAPO-34 catalyst under specific conditions can significantly improve the yield of ethylene and light olefins.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ya-Qin Tang, Meng-Xia Yan, Chang-Qian Lu, Shao-Yuan Li, Kui-Xian Wei, Tao Qu, Wen-Hui Ma, Yong-Nian Dai, Kong-Zhai Li, Da-Jun Luo, Xue-Liang Zhang, Yi-Ke Liu
Summary: This study reports a novel W18O49/Au/SAPO-34 multifunctional photothermal catalyst for the methanol-to-olefins (MTO) reaction, which exhibits excellent methanol conversion and ethylene yield. The physiochemical characterization reveals the properties of the catalyst and the role of W18O49 in regulating ethylene selectivity. This research provides new insights for designing heterostructures to improve photo-to-chemical conversion performance.
Article
Chemistry, Inorganic & Nuclear
Daniel Ali, Zhihui Li, Muhammad Mohsin Azim, Hilde Lea Lein, Karina Mathisen
Summary: By utilizing catalytic model reactions, the topological location of transition metal sites in hierarchical SAPOs was probed. Iron(III) incorporated hierarchical SAPO-11 was prepared and found to be located in highly accessible mesopores. The location was further confirmed through studying base-catalyzed model reactions.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Applied
Yadong Bai, Qinghu Zeng, Jinghui Sun, Qingfeng Song, Lei Tang, Wenwen Zhang, Zhiping Liu, Dahai Pan
Summary: In this study, bi-phases composite zeolites (SSC) consisting of SAPO-5 and SAPO-34 were successfully prepared and exhibited excellent hierarchical pore structure and catalytic performance during methanol to olefin (MTO) reaction, showing prolonged catalytic life and increased selectivity for light olefins.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Biochemical Research Methods
Abbas Aghaeinejad-Meybodi, Seyed Mahdi Mousavi, Ali Asghar Shahabi, Mohammad Rostampour Kakroudi
Summary: The study evaluated the performance of a sodalite membrane reactor in the MTO process for ethylene and propylene production using 3-dimensional CFD technique. Key operation parameters were studied to assess the performance of sodalite MR, and results showed higher methanol conversion compared to a fixed-bed reactor. The CFD model results demonstrated good agreement with experimental data, indicating the potential of sodalite MR for higher efficiency in methanol conversion.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2021)
Article
Chemistry, Multidisciplinary
Runze Jin, Haobin Hu, Jiaofei Wang, Zhuangzhuang Zhang, Chengyi Dai, Xiaoxun Ma
Summary: Dividing the traditional methanol to aromatics reaction into two steps using SAPO-34 and Zn/ZSM-5 as catalysts can significantly improve the aromatic selectivity through optimized loading methods and ratios.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Mengheng Wang, Ziwei Wang, Suhan Liu, Runtian Gao, Kang Cheng, Lei Zhang, Guoquan Zhang, Xiaojian Min, Jincan Kang, Qinghong Zhang, Ye Wang
Summary: The integration of methanol synthesis and methanol-to-olefins conversion in a bifunctional process provides a new synthetic strategy for lower olefins. Designing matchable zeolite components remains challenging, but a hierarchical SAPO-34 zeolite with a sandglass-like structure shows promise in enhancing selectivity and stability in syngas conversion. High-pressure hydrogen and moderate density of acid sites play crucial roles in achieving high C-2-C-4(=) selectivity in the conversion process.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Peng Lu, Madame Riswan, Xiaoning Chang, Kaiwen Zhu, Emmerson Hondo, Abdul Nyako, Chuang Xing, Ce Du, Shuyao Chen
Summary: This study investigates the hydrogenation of CO2 and the synthesis of light olefins using core-shell catalysts. The results showed that the structure and composition of the catalysts play a crucial role in product selectivity. The addition of CZZ favored the production of light alkanes, while the addition of ZZ promoted the generation of light olefins. Furthermore, the addition of a shell layer on the catalyst surface helped to further control the product selectivity.
Article
Chemistry, Applied
Lu Xuan, Xiaotong Wang, Yujun Zhu, Zhibin Li
Summary: A low hydrothermal temperature, short crystallization time and green strategy were developed to synthesize low-silica SAPO-34. Only under a pressure of 2.7 MPa, pure SAPO-34 with smaller crystal size and moderate acidity was obtained, showing enhanced lifetime and light olefins selectivity in methanol to olefins. A possible formation mechanism of low-silica SAPO-34 was proposed.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Christophe Coudercy, Mathieu S. Prevot, Pavel Afanasiev, Stephane Loridant
Summary: Bifunctional MnOx+SAPO-34 catalysts were prepared either by mechanical mixing or by mixing of ethanol suspensions. The selectivity to light olefins was initially lower for the mechanical mixture, but reached the same level as the suspension mixture after 14 hours of continuous operation. SEM images showed that in situ breaking of SAPO-34 agglomerates and dispersion of SAPO-34 crystals among MnOx primary particles contributed to this convergence, decreasing the contact distance between the two catalytic functions. These results highlight the importance of micrometer-scale intimacy in improving catalytic properties in the OXZEO process.
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)
