Article
Energy & Fuels
Mingquan Li, Aqsa Noreen, Yajie Fu, Cederick Cyril Amoo, Yujia Jiang, Xu Sun, Peng Lu, Ruiqin Yang, Chuang Xing, Shurong Wang
Summary: The study focuses on the direct synthesis of higher olefins (C5+) from syngas using a novel Fe@Na-ZSM-5 composite catalyst, achieving a selectivity of 70% olefins in gasoline. The promotion by Na ions enhances the formation of Fe5C2 phases, facilitating C-C coupling and increasing gasoline and olefins selectivity. Na type zeolite (Na-Zeolite) serves as a unique Na electron promoter, contributing significantly to the development of heterogeneous catalysts and functional materials.
Article
Multidisciplinary Sciences
Chuanhao Wang, Junjie Du, Lin Zeng, Zhongling Li, Yizhou Dai, Xu Li, Zijun Peng, Wenlong Wu, Hongliang Li, Jie Zeng
Summary: The authors develop a universal strategy to synthesize extra-heavy olefins through the sustained release of hydrogen and selective extraction of olefins. They achieve the selective production of C(12+)(=) from CO and water using Pt/Mo2N and Ru particles as catalysts in polyethylene glycol (PEG). PEG acts as a selective extraction agent to hinder hydrogenation of olefins. Under optimal conditions, the yield ratio of CO2 to hydrocarbons reaches the theoretical minimum, and the C(12+)(=) yield reaches its maximum with a selectivity of 40.4%.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Waleeporn Donphai, Naphaphan Kunthakudee, Sirapat Munpollasri, Pariyawalee Sangteantong, Surangrat Tonlublao, Wanwisa Limphirat, Yingyot Poo-arporn, Sirapassorn Kiatphuengporn, Metta Chareonpanich
Summary: The application of an external magnetic field in reaction processes has shown to improve movement of magnetic particles, reduce activation energy, and enhance gas-solid contact. This study demonstrated the synergistic effect between magnetic field and limited mass transfer within zeolite cavities in CO hydrogenation, resulting in improved mass transfer ability and catalytic activity with tailored reaction pathways. The innovative challenge posed by these synergistic interactions presents opportunities for green and sustainable chemical processes in the future.
Article
Chemistry, Physical
Janardhan L. Hodala, Dong J. Moon, Kakarla Raghava Reddy, Ch Venkata Reddy, T. Naveen Kumar, Mohd Imran Ahamed, Anjanapura V. Raghu
Summary: The FT process has great potential for energy security and utilizing greenhouse gases. The formation of hydrocarbons in the process can be controlled by catalyst selection and active metal support interactions. The ratio of syn-gas is crucial for desired conversion and selectivity towards C5+ products, with support playing a significant role in product distribution and CO conversion.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Applied
Qiao Zhao, Haoting Liang, Shouying Huang, Xiaoxue Han, Hongyu Wang, Jian Wang, Yue Wang, Xinbin Ma
Summary: In this study, Fe3O4 bulk catalysts assembled from nanoparticles were synthesized to investigate the size effect of Fe phase. The results show that when the particle size is smaller than 10 nm, the catalysts exhibit similar catalytic activity, while beyond 10 nm, the activity decreases significantly. Particularly, Fe3O4 with a nanoparticle size of 9.9 nm shows the highest activity, selectivity and ratio. Smaller particles contribute to C5+ formation while inhibiting CH4 selectivity.
Article
Energy & Fuels
Chao Wang, Huaqing Zhu, Juan Zhang, Zhijun Huang, Jiangang Chen
Summary: A series of Fe-Mn bimetallic catalysts with different pretreatment atmospheres were used for the Fischer-Tropsch synthesis (FTS). The structure of Fe-Mn bimetallic catalysts was analyzed and the effect of different pretreatment atmospheres on reduction efficiency was investigated. It was found that nitrided Fe-Mn catalysts exhibited better stability and higher light olefin selectivity.
Article
Chemistry, Physical
Khasan Nasriddinov, Ji-Eun Min, Hae-Gu Park, Seung Ju Han, Jingyu Chen, Ki-Won Jun, Seok Ki Kim
Summary: Adding a small amount of Zn significantly improves CO2 conversion and C5+ selectivity in the hydrogenation process, as a result of the easy formation of Zn ferrite alloy and the large number of basic sites generated.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Applied
Ming Zhao, Jinchang Sun, Xiaohong Li, Qianwen Zhang
Summary: By adjusting the calcination temperature of the alumina supporter and adding S precursors, the catalytic performance of the iron-based catalyst for the direct synthesis of light olefins from syngas can be optimized.
Article
Energy & Fuels
Zhunzhun Ma, Weixin Qian, Haitao Zhang, Hongfang Ma, Qiwen Sun, Weiyong Ying
Summary: The research found that the effects of magnesium and lithium on the catalyst can enhance CO adsorption, improve FTO activity, weaken carbonization process, increase the selectivity of light olefins, as well as promote CO conversion, and decrease CO2 production.
Article
Engineering, Chemical
Mehar U. Nisa, Yao Chen, Xin Li, Xiangning Jiang, Zhenhua Li
Summary: Fe@C catalysts were synthesized and their performance was studied by investigating the effect of pyrolysis temperature. The catalyst pyrolyzed at 800 degrees C showed high C5+ hydrocarbon selectivity and good reaction stability.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Chemistry, Physical
Hafsa Karroum, Sergey Chenakin, Sergei Alekseev, Viacheslav Iablokov, Yizhi Xiang, Vincent Dubois, Norbert Kruse
Summary: This study presents a one-step-one-pot synthesis of chain-lengthened aliphatic amines and nitriles using potassium-promoted Co/MnOx catalysts, showing that the reaction can be tuned by adjusting the H-2/CO ratio. Additionally, the addition of NH3 strongly favors the formation of chain-lengthened olefins over alkanes.
Article
Chemistry, Applied
Lilia Sineva, Ekaterina O. Gorokhova, Kirill O. Gryaznov, Ilya S. Ermolaev, Vladimir Z. Mordkovich
Summary: The use of zeolite-containing Co catalysts in liquid hydrocarbon transformations during Fischer-Tropsch synthesis demonstrated a decrease in the average molecular weight of the products without increasing methane selectivity. The introduction of zeolites cleared the catalyst pore system of heavier hydrocarbons, suggesting a potential role in controlling product composition over hybrid catalysts.
Article
Chemistry, Physical
Yunlei An, Xinxing Wang, Hailing Yu, Xingzhen Qi, Dong Lv, Tiejun Lin, Liangshu Zhong
Summary: The promotion effect of manganese on the Ru-based Fischer-Tropsch to olefins (FTO) reaction was investigated. Methane formation and second hydrogenation of olefins were effectively suppressed, while catalytic activity and olefin formation, especially for long-chain olefins, were greatly promoted with the addition of Mn. Structure characterization suggested that the addition of Mn could promote the dispersion of Ru nanoparticles (NPs) and enhance the electron density of metallic Ru sites, thus boosting the level of CO adsorption and dissociation. The electronic effect of Mn also creates a C*-rich local chemical environment that could weaken the hydrogenation of olefins. This work provides a simple and feasible way to improve Ru atom utilization for the rational design of Ru-based FTO catalysts.
Article
Chemistry, Physical
Wenlong Song, Qiqi Zhu, Kangzhou Wang, Rui Zhu, Qingxiang Ma, Tiansheng Zhao, Qingjie Guo, Xinhua Gao, Jianli Zhang
Summary: This study reports the positive role of residual sodium on the structural properties and catalytic performance of FeAlNa catalysts for olefins synthesis. The residual sodium improves the reduction behavior of Fe species and CO adsorption, inhibits secondary hydrogenation, and also inhibits the interaction between Fe and Al. The modified catalyst achieves a high olefins/paraffins ratio and low CH4 selectivity.
Article
Chemistry, Multidisciplinary
Yun Zou, Pierre-Hugues Stefanuto, Mariarosa Maimone, Marcel Janssen, Jean-Francois Focant
Summary: The study utilized advanced instrumentation to analyze the composition of dodecene products produced from olefin oligomerization, enabling differentiation between different catalysts and feedstocks. Potential indicators were selected using feature selection methods.
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)