Article
Green & Sustainable Science & Technology
Fei Wang, Robert Pace, Yaying Ji, Jianchun Jiang, Xiaoxiang Jiang, Anna Krystianiak, Olivier Heintz, Gilles Caboche, Eduardo Santillan-Jimenez, Mark Crocker
Summary: In this study, the catalytic activity of Ni catalysts in the decarboxylation/decarbonylation of triglycerides to hydrocarbons was improved by employing Pd as a promoter and using multifunctional supports. Pd addition promoted Ni reduction, leading to an increase in the number of active sites. The use of SiO2-Al2O3 as a support further enhanced the catalyst performance by promoting Ni reduction, as well as providing a high surface area and strong acidity.
Article
Chemistry, Physical
Mojtaba Tabandeh, Chin Kui Cheng, Gabriele Centi, Pau Loke Show, Wei-Hsin Chen, Tau Chuan Ling, Hwai Chyuan Ong, Eng-Poh Ng, Joon Ching Juan, Su Shiung Lam
Summary: The methods of producing biofuels can be done through homogeneous and heterogeneous catalysis, with radical-based reactions and transition metal catalysis showing the most promising results, being more active and selective in decarboxylation and decarbonylation of fatty acids.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
Gisele Cristina Rabelo Silva, Maria Helena Cano de Andrade
Summary: This study proposes a model for deoxygenation of vegetable oil components in the manufacturing process of renewable diesel. By evaluating the conversion of triglycerides over the deoxygenation catalyst with rigorous kinetic data, the study analyzes the influence of reactor pressure, temperature, and H2/oil molar ratio, as well as the type of feedstocks. The model can be used for new product design, improving operation conditions, and economic analysis in green diesel manufacturing.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Energy & Fuels
Norshakirah Ahmad Rashidi, Elnida Mustapha, Yeow Yean Theng, Noor Azira Abdul Razak, Najihah Abdul Bar, Khairul Basyar Baharudin, Darfizzi Derawi
Summary: Waste cooking oil is an attractive feedstock for producing advanced biofuels due to its low cost and abundant availability. This study focused on the synthesis and analysis of mesoporous bimetallic catalysts for the catalytic deoxygenation of waste cooking oil. The results showed that the catalyst with 10% Ni-Fe/SBA-15 had the highest liquid yield but low selectivity towards the diesel fraction, while the catalyst with 5% Ni-Co/SBA-15 had the highest selectivity towards the diesel fraction.
Article
Chemistry, Physical
Ji Liu, Edward M. Laguna, Arun Raj Kizhakkayil Mangadan, Kyoungmin Kang, Aaron Aponick
Summary: A simple procedure for intermolecular enantioselective palladium-catalyzed decarboxylative allylation of beta-ketoacids is described. The method uses allyl carbonates as coupling substrates and allows direct access to alpha-allylated ketones with newly formed quaternary stereocenters. Experimental results suggest the transformation proceeds via an inner-sphere mechanism rather than the traditional outer-sphere process, and the reaction demonstrates potential usefulness in the enantioselective synthesis of (+)-adalinine.
Article
Energy & Fuels
Xinhua Yuan, Xiefei Zhu, Liqiang Zhang, Zejun Luo, Xifeng Zhu
Summary: This study investigated the electrochemical conversion mechanism and product distribution of bio-oil, using walnut shell bio-oil with enhanced electrical conductivity. The results showed copolymerization of phenols, aldehydes, and lignin, as well as decarbonylation and decarboxylation of unsaturated fatty acids. The properties of products were characterized, with solid products potentially applicable in new materials and gas products suitable as gas fuels.
BIOENERGY RESEARCH
(2021)
Article
Energy & Fuels
Ratchadaphon Chueaphetr, Totsaporn Suwannaruang, Rattabal Khunphonoi, Pongthanawat Khemthong, Kitirote Wantala
Summary: Producing efficient green biofuels is crucial for completely replacing traditional fossil fuels. In this study, waste cooking palm oil was used to produce biofuels through pyrolytic catalysis cracking with alkaline catalysts. The addition of K2O not only increased the yield of pyrolytic liquid products, but also reduced the oxygenated compounds in biofuels through the deoxygenation process, improving their quality.
Article
Chemistry, Multidisciplinary
Thaddaeus Thorwart, Daniel Roth, Lutz Greb
Summary: The article introduces a novel per(trifluoromethyl)catechol silicon complex, which exhibits strong Lewis acidity and can catalyze deoxygenations of aldehydes, ketones, and amides. This compound represents one of the strongest neutral Lewis acids accessible in the condensed phase.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Physical
N. Asikin-Mijan, J. C. Juan, Y. H. Taufiq-Yap, Hwai Chyuan Ong, Yu-Chuan Lin, G. AbdulKareem-Alsultan, H. V. Lee
Summary: This review examines the potential of renewable biomass for producing green diesel through deoxygenation technology. Various deoxygenation pathways under a free-hydrogen environment were explored, along with the use of acid-base bifunctional catalysts to facilitate the process. It was noted that the acid-base characteristics of the catalysts may lead to undesired by-products and catalyst deactivation.
CATALYSIS COMMUNICATIONS
(2023)
Review
Energy & Fuels
Stefania Lucantonio, Andrea Di Giuliano, Leucio Rossi, Katia Gallucci
Summary: This review focuses on green diesel, a biofuel obtained by catalytic deoxygenation of edible and non-edible biomasses, and compares it with biodiesel and petrodiesel. Green diesel is found to be the best option in terms of physical-chemical properties and reduction in greenhouse gas emissions. The article discusses the deoxygenation process, types of catalysts, feedstocks, operating conditions, reactor configurations, and current industrial processes for green diesel production. It also presents process simulations and environmental economic analyses that suggest the potential of green diesel as a substitute for petrodiesel. Future research should concentrate on catalysts, the use of waste biomasses as feedstock, and the arrangement of national and international policies.
Article
Chemistry, Inorganic & Nuclear
Evgeniy O. Pentsak, Lilya U. Dzhemileva, Vladimir A. D'yakonov, Ruslan R. Shaydullin, Alexey S. Galushko, Ksenia S. Egorova, Valentine P. Ananikov
Summary: Transition metals are crucial in fine organic synthesis, but their toxicity and environmental pollution have raised concerns. The comparison between supported catalysts and soluble metal complex catalysts revealed that supported catalysts have lower cytotoxicity, but their overall impact on the environment can vary depending on the preparation procedure and may have neglected biological effects. Both types of catalysts did not significantly contribute to the overall toxicity of the systems, while commonly ignored byproducts showed higher overall biological influence.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2022)
Article
Chemistry, Organic
Tomoki Yoshida, Takuya Kodama, Mamoru Tobisu
Summary: The rhodium-catalyzed decarbonylation of acylsilanes proceeds through the cleavage of a carbon-silicon bond. When two different acylsilanes are reacted in one batch, crossover products are formed, indicating the presence of two mechanisms in this catalytic reaction.
ASIAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Li-Ya Cao, Jian-Nan Luo, Jia-Sheng Yao, De-Ku Wang, Yuan-Qing Dong, Chao Zheng, Chun-Xiang Zhuo
Summary: The study describes a Mo-catalyzed regiospecific deoxygenative cyclopropanation reaction using readily available 1,2-dicarbonyl compounds, which efficiently produces substituted cyclopropanes with high selectivity and synthetic utility. Preliminary mechanistic studies suggest that phosphine (or silane) acts as both a mild reductant and a good oxygen acceptor, efficiently regenerating the catalytically active Mo catalyst.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Xiao Cai, Yong Liu, Guangjun Li, Weigang Hu, Xu Liu, Mingyang Chen, Weiping Ding, Yan Zhu
Summary: It has been shown that atomically precise metal clusters, such as Pd1Au8(PPh3)(8)(2+), can play a crucial role in the catalytic efficiency of the Suzuki-Miyaura cross-coupling process. The cooperative effect between the central Pd atom and the peripheral Au atoms in the Pd1Au8(PPh3)(8)(2+) cluster has been identified as a key factor in controlling the cross-coupling reaction. By incorporating these clusters into a porous resin, a heterogeneous catalyst called Pd1Au8@Resin has been developed, which demonstrates enhanced catalyst recyclability and continuous performance in the cross-coupling reaction.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Soumyadeep Chakrabortty, Shasha Zheng, Fabian Kallmeier, Eszter Barath, Sergey Tin, Johannes G. de Vries
Summary: A readily available chiral Ru/bisphosphine catalyst was used to achieve the direct asymmetric reductive amination of bio-based levulinic acid (LA) to produce enantioenriched 5-methylpyrrolidinone with excellent enantioselectivity (up to 96% ee) and high isolated yield (up to 89%). Methyl levulinate (ML), a byproduct from the industrial production of 2,5-furandicarboxylic acid (FDCA), can be used as a substitute for LA with similar reactivity and selectivity. Mass spectrometry and isotope labelling studies suggest that the chiral lactam is formed through imine-enamine tautomerization/cyclization followed by asymmetric hydrogenation of the cyclic enamide.
Article
Chemistry, Multidisciplinary
Xuemei Liu, Chaonan Cui, Shuoshuo Wei, Jinyu Han, Xinli Zhu, Qingfeng Ge, Hua Wang
Summary: This study presents a new strategy for designing efficient photocatalysts that can convert CO2 into hydrocarbons by utilizing synergistic catalytic sites. The findings provide a solution for the selective photocatalytic reduction of CO2 to CH4.
Article
Chemistry, Multidisciplinary
Chengxian Hu, Dan Wang, Lu Wang, Ying Fu, Zhengyin Du
Summary: A novel one-pot, three-component reaction conducted under electrochemical conditions was studied. The reaction involved 2-aminothiophenols, aldehydes, and malononitrile, using TBABF4 as an electrolyte and CuI as a catalyst. The proposed reaction mechanism suggested that CuI served as an electron relay. This method offers simplified operation, high atom economy, and mild reaction conditions.
Article
Chemistry, Multidisciplinary
Zhi Yang, Yu Chen, Linxi Wan, Yuxiao Li, Dan Chen, Jianlin Tao, Pei Tang, Fen-Er Chen
Summary: A highly enantioselective method for the complete hydrogenation of pyrimidinium salts using Ir/(S,S)-f-Binaphane complex as the catalyst was developed. This method provides easy access to fully saturated chiral hexahydropyrimidines, which are prevalent in many bioactive molecules. The reactions exhibit high yields and enantioselectivities under mild reaction conditions without additives. Successful application of this methodology in a continuous flow fashion further extends its practical utility.
Article
Chemistry, Multidisciplinary
Tina Jeoh, Jennifer Danger Nill, Wujun Zhao, Sankar Raju Narayanasamy, Liang Chen, Hoi-Ying N. Holman
Summary: In this study, the enzymatic hydrolysis of cellulose was investigated using real-time infrared spectromicroscopy. The spatial heterogeneity of cellulose was found to impact the hydrolysis kinetics. Hydration affected cellulose ordering, and Cel7A preferentially removed less extensively hydrogen bonded cellulose.
Article
Chemistry, Multidisciplinary
Tiphaine Richard, Walid Abdallah, Xavier Trivelli, Mathieu Sauthier, Clement Dumont
Summary: An effective method of grafting functionalities onto lignin based on glycerol carbonate has been developed using an efficient nickel-catalysed telomerisation reaction. This method allows lignin to have new reactive functions and reduces the glass transition temperatures of modified lignins, thereby expanding the application range of lignin-based resins.
Article
Chemistry, Multidisciplinary
Jing Qi, Xiyan Wang, Gan Wang, Srinivas Reddy Dubbaka, Patrick ONeill, Hwee Ting Ang, Jie Wu
Summary: This study presents a green and environmentally friendly approach for the synthesis of imides using electrocatalytic oxidation with H2O as the oxygen source. The method eliminates the need for toxic or expensive oxidants and achieves high yields under mild reaction conditions. It shows broad substrate compatibility and potential for industrial applications.
Article
Chemistry, Multidisciplinary
Babasaheb Sopan Gore, Lin-Wei Pan, Jun-Hao Lin, Yi-Chi Luo, Jeh-Jeng Wang
Summary: Here, we report a visible light-promoted intramolecular radical cascade reaction for the construction of fluorenol and naphthalene-fused cyclopropyl carbaldehyde derivatives. This method offers mild reaction conditions, a broad substrate scope, excellent step efficiency, and scalability, without the need for external chemical oxidants. The novelty of this protocol was demonstrated by synthesizing chrysene analogs and performing late-stage functionalizations.
Article
Chemistry, Multidisciplinary
Juho Antti Sirvio, Idamaria Romakkaniemi, Juha Ahola, Svitlana Filonenko, Juha P. Heiskanen, Ari Ammala
Summary: This article discusses the method of using supramolecular interaction between an aromatic hydrogen bond donor and lignin to achieve rapid delignification of softwood at low temperatures.
Article
Chemistry, Multidisciplinary
Yunyan Meng, Chunxiang Pan, Na Liu, Hongjiang Li, Zixiu Liu, Yao Deng, Zixiang Wei, Jianbin Xu, Baomin Fan
Summary: A novel visible light-driven synthesis method for 2,3-diamines has been developed, which has mild conditions, avoids the use of metal reagents, and can synthesize diamines and diols in one pot.
Article
Chemistry, Multidisciplinary
Mingqing Huang, Haiyang Huang, Mengyao You, Xinxin Zhang, Longgen Sun, Chao Chen, Zhichao Mei, Ruchun Yang, Qiang Xiao
Summary: A direct air-oxidized strategy for the synthesis of benzo[b]phosphole oxides was developed in this study. Arylphosphine oxides were transformed into phosphinoyl radicals, which were further combined with various alkynes to achieve the desired products. DFT calculations revealed the mechanism of phosphinoyl radical formation.
Article
Chemistry, Multidisciplinary
Anwei Wang, Jiayin Huang, Chunsheng Zhao, Yu Fan, Junfeng Qian, Qun Chen, Mingyang He, Weiyou Zhou
Summary: This study demonstrates an innovative strategy for the aerobic oxidation of C(sp(3))-H bonds using gamma-valerolactone. By optimizing the reaction conditions and utilizing specific catalysts, efficient oxidation of C(sp(3))-H bonds is achieved with good chemoselectivity in certain cases.
Article
Chemistry, Multidisciplinary
Shun Li, Likai Tong, Zhijian Peng, Bo Zhang, Xiuli Fu
Summary: Sulfide compounds show promise as electrocatalysts for water splitting, but their performance is limited by factors such as limited active sites and hindered substance transport. This study successfully prepared a high-entropy sulfide (ZnCoMnFeAlMg)(9)S-8, which reduced grain size and increased specific surface area, enabling the realization of a dual-functional catalyst with multiple catalytic sites. High entropy also modulated the electronic properties of sulfides, reducing the potential energy barrier for hydrolysis. This research introduces a new approach for functionalizing high entropy nanomaterials and improves the performance of water splitting catalysts.