Article
Chemistry, Physical
Christopher C. McAtee, Daniel J. Nasrallah, Ho Ryu, Michael R. Gatazka, Rory C. McAtee, Mu-Hyun Baik, Corinna S. Schindler
Summary: We describe a regioselective Lewis-acid-catalyzed method for the synthesis of highly functionalized cyclopentadienes incorporating diverse subunits. Insightful studies suggest that the mechanism involves Lewis-acid-catalyzed cycloadditions followed by stepwise oxetane fragmentation, resulting in the formation of functionalized cyclopentadienes. This work provides new insights into the design of catalytic carbonyl-olefin metathesis reactions.
Article
Chemistry, Multidisciplinary
Jianjin Yu, Renqin Zhan, Chao-Jun Li, Huiying Zeng
Summary: In this study, iodomethane was used as a C1 organocatalyst for the aerobic ortho-selective trifluoromethylation of pyridines without a transition metal. Trifluoroacetic acid was employed as an affordable and readily available trifluoromethyl source. The reaction showed good functional group compatibility and could selectively trifluoromethylate pyridine-containing drug molecules for late-stage functionalizations.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Rui Churro, Fernando Mendes, Paulo Araujo, Luis M. Madeira, Filipa Ribeiro
Summary: The experiment showed that Ni-based catalysts exhibit higher activity, while Pd-based catalysts are more selective towards aniline. The metallic dispersion of the catalysts is closely related to their activity, with the Ni-based catalyst containing 46wt. % Ni showing the most promising characteristics.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Review
Chemistry, Multidisciplinary
Maximilian J. Werny, Florian Meirer, Bert M. Weckhuysen
Summary: This review discusses the application of 2D and 3D chemical imaging techniques in the study of olefin polymerization and polyolefin decomposition catalysts. Laboratory and synchrotron-based chemical imaging techniques provide high spatial and temporal resolutions, expanding the analytical tools available in the field of heterogeneous catalysis and polymer science. Future research directions include in situ and operando (spectro-)microscopy experiments, as well as obtaining real-time information on the formation, decomposition, and mobility of polymer phases within single catalyst particles.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Tuong Anh To, Chao Pei, Rene M. Koenigs, Thanh Vinh Nguyen
Summary: In this study, the promotion of carbonyl-olefin metathesis reactions by hydrogen-bonding-assisted Bronsted acid catalysis was investigated. The role of hexafluoroisopropanol (HFIP) solvent in assisting the pTSA Bronsted acid catalyst and the current limitations of the carbonyl-olefin metathesis reaction were revealed through experimental and computational mechanistic studies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Applied
Feng Lin, Yudan Zhong, Yulong Ma, Yonggang Sun, Xiuqin Men, Yingbo Zhu
Summary: In this paper, a rare earth metal La2O3-doped bimetallic supported catalyst Ni-La2O3/H-ZSM-5 was prepared and used for the catalytic conversion of lignin model compound guaiacol to cyclohexanol in the aqueous phase. The results showed that the doping of La2O3 changed the distribution of Ni and caused electron transfer between La2O3 and Ni. Additionally, a strong metal carrier interaction occurred between the bimetallic Ni-La2O3 and H-ZSM-5, which effectively promoted the hydrolysis of the C-O ether bond in guaiacol and significantly improved the catalyst's activity.
JOURNAL OF RARE EARTHS
(2023)
Review
Nanoscience & Nanotechnology
Guangxin Xue, Linlin Yin, Shengxian Shao, Guodong Li
Summary: Phenol is an important platform molecule for synthesizing valuable chemical intermediates and products. The selective hydrogenation of phenol towards cyclohexanone or cyclohexanol has attracted great interest, but industrial application remains challenging. This review summarizes recent progress in selective hydrogenation of phenol with different catalysts, discussing the relationship between active components, support type, and catalyst performance, as well as the possible reaction mechanism and scale-up methods. Potential challenges and future developments of metal nanocatalysts for selective hydrogenation of phenol are also proposed.
Article
Chemistry, Multidisciplinary
Miroslav Medved', Mark W. H. Hoorens, Mariangela Di Donato, Adele D. Laurent, Jiayun Fan, Maria Taddei, Michiel Hilbers, Ben L. Feringa, Wybren Jan Buma, Wiktor Szymanski
Summary: The study focuses on a multi-responsive molecular switch that can be controlled by light and acid-base equilibrium to modulate its properties and functions.
Article
Chemistry, Physical
Seok-Hyeon Cheong, Daeun Kim, Huyen Tran Dang, Dongwook Kim, Bora Seo, Minserk Cheong, Soon Hyeok Hong, Hyunjoo Lee
Summary: This study reports that the anionic form of palladium, PdCl(4)(2-), can effectively convert methane to methyl trifluoroacetate (MeTFA) in the K2S2O8-HTFA oxidation system. The anionic catalyst form increases Pd solubility in the HTFA solvent, facilitating the conversion to the real catalytic species. The role of trifluoroacetic anhydride (TFAA) in removing water produced by the oxidant and oxidation byproduct is also identified for the first time.
JOURNAL OF CATALYSIS
(2022)
Article
Engineering, Environmental
Jieying Zhou, Navid Saeidi, Lukas Y. Wick, Yanlin Xie, Frank-Dieter Kopinke, Anett Georgi
Summary: The research shows that surface defunctionalized activated carbon felt (DeACF) can effectively adsorb trifluoroacetic acid (TFA) through enhanced interactions between hydrophobic carbon surface and CF3 moieties. The electro-assisted TFA desorption using Na2SO4 as electrolyte shows high efficiency in recovering TFA. Despite the decrease in adsorption capacity caused by surface oxidation, the system stability can still be maintained.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Chemical
Mingyuan Hu, Hui Tian
Summary: A three-column process for catalytic distillation was established to efficiently convert cyclohexene to cyclohexanol, with simulation showing good advantages. Emphasis was placed on stable operation of the distillation system and design of the control scheme.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Applied
Walmik Karbhari Gaikwad, Kisan M. Kodam, Rajeev M. Dhere, Swapan K. Jana, Manish Gautam, Asha D. Mallya, Dipen Soni, Sudhakar Bhagade, Ashishkumar Gulahne
Summary: The study developed a method for purification and depolymerization of Streptococcus pneumoniae serotype 2 CPS, using TFA treatment to achieve both processes simultaneously. Results showed that the antigenicity of CPS was not affected after purification and depolymerization.
CARBOHYDRATE POLYMERS
(2021)
Review
Chemistry, Physical
Xinya Liu, Jean-Luc Pozzo, Abdallah Hamze, Mouad Alami, Olivier Provot
Summary: This article reviews the significance of water addition on unsymmetrical internal alkynes in organic chemistry and presents a range of highly regioselective methods for different types of internal alkynes. It discusses hydration reactions of electron-rich and -poor diarylalkynes, arylalkylalkynes, and internal alkynes directed by carbonyl groups. The article also examines hydration reactions involving alkynes linked to CF3, esters, ketones, and heteroatoms. Mechanistic hypotheses explaining the regioselectivity in hydration reactions are discussed.
Article
Chemistry, Physical
Biao Yang, Deyi Zhang, Xu Xia, Xianxin Meng, Yulian He, Bing Wang, Zhiyong Han, Kunjie Wang
Summary: In this study, a stable electrolyte with high operating potential, trifluoroacetic acid (TFA), is developed and combined with a specially designed porous carbon material to fabricate supercapacitors with high energy density and stable cycling performance. Compared to traditional acidic electrolytes, the TFA electrolyte can enhance the energy density of supercapacitors by 2.26 times without sacrificing their high-power density and cycle stability. This simple and feasible method significantly improves the energy density of aqueous supercapacitors, promoting their practical application in modern electrochemical energy storage systems.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Multidisciplinary
Youbin Peng, Xiaohong Huo, Yicong Luo, Liang Wu, Wanbin Zhang
Summary: This study presents an enantio- and diastereodivergent synthesis of rigid spirocycles through dual-metal catalysis, offering a promising approach for the development of new N-olefin ligands. Preliminary mechanistic studies were conducted to understand the bimetallic catalysis process.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
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)