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
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
Engineering, Environmental
Majid Mohammadi, Mehdi Sedighi
Summary: This study aims to optimize the operating conditions for one-step carbon dioxide hydrogenation to light olefins using ternary CuZnZr metal oxide and SAPO-34 zeolite catalysts. The impact of temperature, space velocity, and H2/CO2 ratio on CO2 conversion, olefins selectivity, and CO selectivity was studied using response surface methodology (RSM). The optimal conditions were determined to be 375 degrees C, a space velocity of 9 L/g.h, and an H2/CO2 ratio of 3, resulting in a CO2 conversion rate of 16.56%, olefins selectivity of 77.24%, and CO selectivity of 67.91%. The hybrid catalyst demonstrated remarkable stability after 100 h of operation without losing activity, showing the potential of CuZZ/SAPO-34 catalyst for CO2 reduction to light olefins under optimized conditions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
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
Chemistry, Multidisciplinary
Kangzhou Wang, Jianli Zhang, Subing Fan, Xiaobo Peng, Noritatsu Tsubaki, Tian-Sheng Zhao
Summary: Composite HZSM-5/SAPO-5 zeolite catalysts with adjustable Bronsted acid/Lewis acid and weak acid/strong acid ratios were fabricated for selective LPG transformation. The catalysts showed high propylene and ethylene selectivity with varying crystallization times.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Applied
Mingliang Tong, Linet Gapu Chizema, Xiaoning Chang, Emmerson Hondo, Lin Dai, Yan Zeng, Chunyang Zeng, Haseeb Ahmad, Ruiqin Yang, Peng Lu
Summary: In this study, a composite catalyst combining a metal catalyst and a modified zeolite was used for direct CO2 hydrogenation to light olefins. By tuning the ionic structure and acidity of the zeolite, high CO2 conversion and significant light olefins selectivity were achieved, showcasing great potential for utilizing CO2 resources in green chemistry.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Guichen Ping, Kai Zheng, Qihua Fang, Gao Li
Summary: This study reports a new protocol for synthesizing MnNC@SAPO-34 catalysts, where Mn nanoclusters enhance olefins selectivity and improve catalyst durability.
Article
Energy & Fuels
Xiaoning Chang, Emmerson Hondo, Wenjia Yu, Kime Mala Ali, Abdul Nyako, Chuang Xing, Zhixiang Yang, Peng Lu
Summary: In this paper, the interaction between metal catalyst and Mn-doped molecular sieve was proposed as a strategy to regulate the metal valence and promote carbon dioxide adsorption during CO2 hydrogenation reaction. The ZnO-ZrO2/4%MnSAPO-34 catalyst exhibited enhanced CO2 adsorption capacity and activity compared to the unmodified catalyst. Physical and chemical properties of the catalysts were explored, and the acidity, which plays a crucial role in the selectivity of light olefins, was controlled by fine tuning the Mn amount on SAPO-34 catalyst.
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
Chemistry, Physical
Qiang Liu, Jie Ding, Ruonan Wang, Qin Zhong
Summary: The FeZnK/SAPO-G catalyst, prepared through a granule-stacking method, shows excellent catalytic activity in terms of high CO2 conversion and favorable light olefin selectivity. The integrated manner of FeZnK and SAPO-34 has a significant impact on the catalyst performance.
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
Green & Sustainable Science & Technology
Peng Lu, Xiaoning Chang, Wenjia Yu, Qianwen Hu, Kime Mala Ali, Chuang Xing, Ce Du, Zhixiang Yang, Shuyao Chen
Summary: ZnO-ZrO2 and SAPO-34 catalysts were prepared and used for the synthesis of light olefins through CO2 hydrogenation. The ZnO-ZrO2@SAPO-34 catalysts with unique core-shell structure and appropriate acidity showed enhanced selectivity towards light olefins. The optimization of catalyst structure and performance resulted in a ZnO-ZrO2@SAPO-34 catalyst with 73% selectivity to light olefins and 16.1% CO2 conversion.
Article
Thermodynamics
Ajoy Ramalingam, Snehasish Panigrahy, Yann Fenard, Henry Curran, Karl Alexander Heufer
Summary: Recent rigorous experimental and theoretical investigations have enhanced our understanding of fuel oxidation and fundamental fuel chemistry. Propane and propene have been studied in various conditions, but their interaction has not been well explored. These two species are crucial in the oxidation of larger hydrocarbons.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Applied
Yunshan Shang, Yi Liu, Delin Yuan, Jingyun Chen, Hua Liu, Fu-Kuo Chiang, Hui Wei, Aihua Xing, Shengfu Ji
Summary: In this study, bifunctional catalysts composed of SAPO-34 zeolite and Mn-doped ZnCrAlOy oxide were used for the direct conversion of syngas to light olefins. It was found that Mn doping could decrease the particle size of ZnCrAlOy spinel and increase the formation of oxygen vacancies, which protected more light olefins and intermediates from hydrogenation.
FUEL PROCESSING TECHNOLOGY
(2023)
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, Multidisciplinary
Boyuan Shen, Xiao Chen, Dali Cai, Hao Xiong, Xin Liu, Changgong Meng, Yu Han, Fei Wei
ADVANCED MATERIALS
(2020)
Article
Engineering, Chemical
Chenxi Zhang, Shuyue Li, Zhiguo Wang, Yansong Shen, Fei Wei
Article
Chemistry, Applied
Zhexi Xiao, Chunhui Yu, Xianqing Lin, Xiao Chen, Chenxi Zhang, Hairong Jiang, Fei Wei
Summary: Silicon dioxide derivative SiOx has attracted attention for its smaller volume change rate and higher reaction activation energy compared to silicon, indicating a higher energy barrier that can effectively prevent side reactions. Additionally, carbon coating on SiOx could further improve resistance to side reactions, making it a more stable and better cyclic anode material for lithium-ion batteries compared to silicon.
Article
Multidisciplinary Sciences
Yunxiang Bai, Hongjie Yue, Jin Wang, Boyuan Shen, Silei Sun, Shijun Wang, Haidong Wang, Xide Li, Zhiping Xu, Rufan Zhang, Fei Wei
Editorial Material
Chemistry, Applied
Cuijuan Zhang, Sibudjing Kawi, Fei Wei, Yongdan Li
Article
Physics, Applied
Zhenxing Zhu, Nan Wei, Jun Gao, Yaxin Jiang, Lianmao Peng, Fei Wei
Summary: In the study, a clean and curved CNT structure with specified curvature radius was synthesized through micro perturbation, demonstrating that the curved structure can maintain high output delivery in transistors even though it limits the on/off ratio significantly. The resistance induced by localized strain and the extra current delivery capability of the inner walls play a crucial role in this phenomenon, which can be explained by the energy band diagram model. Among the curved CNTs, incommensurate double-walled CNTs with higher diameter difference are identified as optimal candidates for delivering high current output by limiting intertube charge transfer.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Zhoufei Yang, Jiarui Tian, Zhenzhen Ye, Ying Jin, Chaojie Cui, Qing Xie, Jin Wang, Gang Zhang, Zhuoya Dong, Yonghua Miao, Xiang Yu, Weizhong Qian, Fei Wei
ENERGY STORAGE MATERIALS
(2020)
Article
Chemistry, Physical
Mingjun Zhang, Xijun Wu, Guo Yang, Nan Qian, Fei Wei, Chao Zhao, Jiayu Liu, Ke Deng, Wei Liu
Summary: In this study, DFT was used to investigate tritium adsorption and desorption on the edges of nuclear graphite, revealing that adsorption energy depends on edge structure and hydrogenation level, and increases with hydrogen partial pressure before dropping rapidly at high temperature. Three different stages were identified for the desorption of hydrogen isotopes from nuclear graphite.
Article
Chemistry, Multidisciplinary
Jun Gao, Zhenxing Zhu, Boyuan Shen, Yunxiang Bai, Silei Sun, Fei Wei
Summary: This article elaborates on the growth kinetics of sp(2) nanocarbons from the perspective of template autocatalysis and holistic electronic structure, discussing the role of CNTs and graphene as template autocatalysts during CVD. It analyzes current growth kinetics models and representative works, revealing the bandgap-coupled kinetics and selective synthesis results.
Article
Multidisciplinary Sciences
Bei Zhao, Zhong Wan, Yuan Liu, Junqing Xu, Xiangdong Yang, Dingyi Shen, Zucheng Zhang, Chunhao Guo, Qi Qian, Jia Li, Ruixia Wu, Zhaoyang Lin, Xingxu Yan, Bailing Li, Zhengwei Zhang, Huifang Ma, Bo Li, Xiao Chen, Yi Qiao, Imran Shakir, Zeyad Almutairi, Fei Wei, Yue Zhang, Xiaoqing Pan, Yu Huang, Yuan Ping, Xidong Duan, Xiangfeng Duan
Summary: This study presents a straightforward approach to producing high-order van der Waals superlattices by rolling up van der Waals heterostructures, demonstrating the modulation of electronic band structure and dimensionality. It provides a rich material platform for both fundamental studies and technological applications, showcasing the potential for creating diverse mixed-dimensional van der Waals superlattices.
Review
Chemistry, Multidisciplinary
Xiao Chen, Boyuan Shen, Hao Xiong, Fei Wei
Summary: Molecular sieves and metal organic framework (MOF) materials are widely used in various fields due to their unique pores and framework structures. Atomic scale characterization of their structures is crucial for understanding their structure-activity relationships. The development of iDPC-STEM technology allows for imaging of sensitive materials, providing new possibilities for studying porous framework materials.
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
(2021)
Article
Chemistry, Physical
Zhexi Xiao, Chunhui Yu, Xianqing Lin, Xiao Chen, Chenxi Zhang, Hairong Jiang, Rufan Zhang, Fei Wei
Review
Chemistry, Multidisciplinary
Zhuoya Dong, Bofan Li, Chaojie Cui, Weizhong Qian, Yong Jin, Fei Wei
REACTION CHEMISTRY & ENGINEERING
(2020)
Article
Chemistry, Physical
Syed Zulfiqar Ali Gilani, Le Lu, Muhammad Tahir Arslan, Babar Ali, Qi Wang, Fei Wei
CATALYSIS SCIENCE & TECHNOLOGY
(2020)
Article
Chemistry, Physical
Zhexi Xiao, Chao Lei, Chunhui Yu, Xiao Chen, Zhenxing Zhu, Hairong Jiang, Fei Wei
ENERGY STORAGE MATERIALS
(2020)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)
