Article
Green & Sustainable Science & Technology
Xiaocheng Lin, Mantian Li, Zhiwen Chen, Meichen Li, Youjie Huang, Ting Qiu
Summary: PSILs were fabricated by a facile reaction between PEI and PS, showing high catalytic activity and stability for biodiesel production. The one-step fabrication process of PSILs is simpler than traditional ILs, indicating potential advantages.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Azmat Mehmood Asim, Maliha Uroos, Sadia Naz, Nawshad Muhammad
Summary: This study focused on the isolation of lignin from wheat straw using acidic ionic liquids (AILs) as pretreatment solvents, specifically synthesizing three protic ionic liquids. The ionic liquid with the highest ratio of add [PyH][HSO4 center dot(H2SO4)(3)] (IL3) showed the most efficient lignin removal with 79% delignification and 77% lignin recovery under mild conditions. The cellulose rich material and isolated lignin were characterized to assess their structure and stability, with enzymatic hydrolysis showing a high yield of reducing sugars, indicating successful lignin removal.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Applied
Ivan A. Andreev, Maksim A. Boichenko, Nina K. Ratmanova, Olga A. Ivanova, Irina I. Levina, Victor N. Khrustalev, Igor A. Sedov, Igor Trushkov
Summary: A new method for the synthesis of 4-(dimethylamino)pyridinium azide was reported, which is a stable and non-explosive source of azide ion soluble in organic solvents. In protic ionic liquid media, this reagent serves as a safer alternative to toxic and unstable hydrazoic acid. The synthetic utility of this method was demonstrated using a model reaction, showing its wide range of applications.
ADVANCED SYNTHESIS & CATALYSIS
(2022)
Review
Green & Sustainable Science & Technology
Kapil Mamtani, Kaveh Shahbaz, Mohammed M. Farid
Summary: The shift towards lesser-polluting and carbon-efficient energy systems has made biodiesel an attractive option for sustainable bioenergy. However, the lack of feedstock flexibility and reliance on vegetable oils for production poses a challenge in resource allocation, leading to potential competition with food supply. Exploring low-grade non-edible oil sources and improving catalyst selection for glycerolysis reactions are key factors in enhancing biodiesel profitability and sustainability in the future.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Alina Brzeczek-Szafran, Justyna Wieclawik, Natalia Barteczko, Anna Szelwicka, Emily Byrne, Anna Kolanowska, Malgorzata Swadzba Kwasny, Anna Chrobok
Summary: The dicationic and tricationic ionic liquids, synthesized by proton transfer from sulfuric acid and corresponding di- and triamines, show potential as Bronsted acidic catalysts in biodiesel production. These new ionic liquids are cost-effective and highly acidic, outperforming sulfuric acid and other catalysts in catalytic esterification reactions by absorbing water and phase-separating the ester. The interplay between acidity and physical properties, such as density and viscosity, enables easy phase separation of water from the ester, while substrate scope and recycling studies demonstrate their robustness and recyclability as catalysts.
Article
Engineering, Chemical
Xiaocheng Lin, Youjie Huang, Ling Li, Changshen Ye, Jie Chen, Ting Qiu
Summary: A series of polymeric ionic liquids were prepared as effective heterogeneous catalysts for biodiesel production via esterification of free fatty acids. By adjusting the molecular weight of PEI and further treatment of acids, ultrahigh acidity and catalytic performance could be achieved. Under optimal conditions, high oleic acid conversion was obtained with high generality for esterification of other FFAs noted.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Saffron J. Bryant, Stuart J. Brown, Andrew Martin, Radhika Arunkumar, Rekha Raju, Aaron Elbourne, Gary Bryant, Calum J. Drummond, Tamar L. Greaves
Summary: The study found that protic ionic liquids have potential as effective cryoprotective agents, with ethylammonium acetate showing promising results and being safer than the common cryoprotectant, dimethylsulfoxide. The results of this research will inform the development of a suite of potential new ionic liquid-based cryoprotectants that could potentially allow the cryopreservation of new cell types.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Biochemistry & Molecular Biology
Ting He, Cheng-Bin Hong, Peng-Chong Jiao, Heng Xiang, Yan Zhang, Hua-Qiang Cai, Shuang-Long Wang, Guo-Hong Tao
Summary: The study systematically examined the Bronsted acidity of [AAE]X PILs in green solvents and found that the cationic structures had little effect on the acidity, while the anions had no effect. Four different methods were used to determine the acidic strength, including the overlapping indicator method, potential titration method, Hammett method, and DFT method. These methods were reliable for assessing the acidity of [AAE]X.
Article
Biochemistry & Molecular Biology
Eduardo Maurina Morais, Alexander Idstrom, Lars Evenaes, Anna Martinelli
Summary: The dynamical properties of four protic ionic liquids containing ethyltriazolium and ethylimidazolium cations were investigated with triflate and bistriflimide anions. The transport properties were strongly influenced by the cation nature, with the ethyltriazolium cation resulting in slower dynamics. The fragility of the ionic liquids was estimated to fall within the range of very fragile glass-forming materials.
Article
Energy & Fuels
Ivaylo Tankov, Zilya Mustafa, Radoslava Nikolova, Anife Veli, Rumyana Yankova
Summary: This study investigates the kinetics and thermodynamics of biodiesel synthesis using various protic ionic liquids as catalysts. The acidity and internal hydrogen bonding extent of the ionic liquids were found to be directly related to the rate of biodiesel production. Optimal conditions for the process were determined by analyzing the reaction temperature, reactants molar ratio, and catalyst loading.
Article
Energy & Fuels
Shucui Han, Jinbei Yang, Hui Huang
Summary: Two double-site acidic ionic liquids were synthesized and one of them showed excellent catalytic performance and recyclability in esterification reactions. Under optimized conditions, this ionic liquid achieved a conversion rate of 98.65% for oleic acid and maintained high catalytic activity for 9 cycles.
Article
Chemistry, Physical
Timo Stettner, Andrea Balducci
Summary: The development of new and especially safer electrolytes is crucial for modern electrochemical energy storage devices, with ionic liquids showing promise as a potential solution. This article critically compares protic ionic liquids (PILs) with aprotic ionic liquids, and analyzes their use as electrolytes in supercapacitors and batteries. The manuscript also discusses the challenges and outlook for improving and expanding the use of PILs in energy storage devices.
ENERGY STORAGE MATERIALS
(2021)
Article
Chemistry, Physical
Yulia A. Kondratenko, Dmitrii O. Antuganov, Andrey A. Zolotarev, Michail A. Nadporojskii, Valery L. Ugolkov, Tatyana A. Kochina
Summary: Fifteen new protic ionic liquids based on diethanolammonium (DEA) salts of carboxylic acids have been synthesized and identified using a complex of physicochemical methods. The crystal structure of certain DEA salts was determined for the first time. The synthesized DEA ionic liquids were demonstrated to be effective buffer agents.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Thermodynamics
Mohammed Takase, Paul Kwame Essandoh
Summary: The study aimed to produce biodiesel from animal oil as a non-edible feedstock. Acid transesterification resulted in a biodiesel yield of 90 wt.%, while alkali transesterification of esterified fats resulted in a yield of 97.2 wt.%. Biodiesel properties met standards but biodiesel from animal fats is less stable for oxidation, especially in cold weather.
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2021)
Article
Engineering, Mechanical
Ghassan M. J. Al Kaisy, M. Ibrahim A. Mutalib, T. V. V. L. N. Rao, Adolfo Senatore
Summary: The study found that the group of protic ionic liquids as lubricants can significantly reduce the friction coefficient of steel-steel interfaces, with the salicylate protic ionic liquid showing the lowest friction coefficient. Additionally, the 2-naphthoate and salicylate protic ionic liquids in the lubricants exhibited lower wear values compared to polyalphaolefin in the wear test.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Plant Sciences
Anh Tuan Hoang, Ranjna Sirohi, Ashok Pandey, Sandro Nizetic, Su Shiung Lam, Wei-Hsin Chen, Rafael Luque, Sabu Thomas, Muslum Arici, Van Viet Pham
Summary: This paper presents recent advances and potential advantages of microalgae in biofuel production, as well as their role in the energy and environmental sectors. The challenges related to cultivation, harvesting techniques, and downstream processes are discussed, along with promising solutions for industrial-scale production. Additionally, the paper analyzes the role of microalgae in the circular economy.
PHYTOCHEMISTRY REVIEWS
(2023)
Article
Materials Science, Ceramics
Nosheen Farooq, Rafael Luque, Thomas Len, Sameh M. Osman, Ashfaq Mahmood Qureshi, Muhammad Altaf Nazir, Aziz ur Rehman
Summary: P-type semiconductor SrZr0.1Mn0.4Mo0.4Y0.1O3-delta (SZMMY) is composited with n-type ZnO to prepare a solid oxide electrolyte with improved properties for low-temperature fuel cells. The nanocomposite electrolyte material shows enhanced ionic conductivity, power density, and current density at lower temperatures. The structural analysis confirmed a dual-phase crystalline structure, and the electrochemical impedance spectra demonstrated lower charge transfer resistance. The heterostructure nanocomposite SZMMY-ZnO inhibits electronic conduction and achieves high ionic conductivity, resulting in improved fuel cell performance.
CERAMICS INTERNATIONAL
(2023)
Article
Environmental Sciences
Shumila Shaheen, Zohaib Saeed, Awais Ahmad, Muhammad Pervaiz, Umer Younas, Rana Rashad Mahmood Khan, Rafael Luque, Saravanan Rajendran
Summary: This article investigates the adsorptive behavior of graphene-based materials, particularly graphene oxide (GO), in removing dyes and heavy metals from wastewater. The green synthesis of graphene-based composites using aloe vera extract is discussed, along with the mechanism of GO reduction via plant extract. The article also presents a literature survey on the global market value of graphene-based composites and compares green and chemical reduction methods.
Article
Environmental Sciences
Bryan Fernando Rivadeneira-Mendoza, Otoniel Anacleto Estrela Filho, Kevin Jhon Fernandez-Andrade, Fabiola Curbelo, Fausthon Fred da Silva, Rafael Luque, Joan Manuel Rodriguez-Diaz
Summary: This study summarizes and analyzes the use of new hybrids between biomass and metal-organic frameworks (MOF@biomass) in the adsorption process of pollutants. The results show that the functionalization of biomass with MOFs can lead to hybrid materials with higher adsorption capacity. This research is of great significance for environmental protection and industrial applications.
ENVIRONMENTAL RESEARCH
(2023)
Review
Environmental Sciences
Kelvin Adrian Sanoja-Lopez, Kevin Alberto Quiroz-Suarez, Alex Alberto Duenas-Rivadeneira, Naga Raju Maddela, Maria C. B. S. M. Montenegro, Rafael Luque, Joan Manuel Rodriguez-Diaz
Summary: The excessive contamination of drinking water sources by pesticides has harmful effects on human health and the environment. Filtration by polymeric membranes has been identified as a promising technique to address this issue. Functionalization of polymeric membranes has been explored to enhance pesticide retention results.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Misbah Malik, Thomas Len, Rafael Luque, Sameh M. Osman, Emilia Paone, Muhammad Imran Khan, Muhammad Ahmad Wattoo, Muhammad Jamshaid, Aqsa Anum, Aziz Ur Rehman
Summary: In this study, a highly efficient photocatalyst composed of g-C3N4 and doped ZnO-W/M was successfully synthesized for the degradation of organic pollutants in industrial wastewater. The synthesized heterostructure nanocomposites exhibited good structural and morphological properties, and demonstrated effective degradation of dyes. Furthermore, the materials showed excellent mechanical stability and reusability.
ENVIRONMENTAL RESEARCH
(2023)
Review
Energy & Fuels
Yu Li, Yingji Wu, Kouqi Liu, Seyed Ali Delbari, Aejung Kim, Abbas Sabahi Namini, Quyet Van Le, Mohammadreza Shokouhimehr, Changlei Xia, Ho Won Jang, Rajender S. Varma, Rafael Luque
Summary: The demand for sustainable and ecofriendly materials has increased in recent decades. Metal-organic frameworks (MOFs) have attracted significant interest due to their unique chemical and physical properties. They have been utilized in various chemistries to convert biomass into biofuels and other valuable compounds. This review article discusses the conversion of glucose into 5-hydroxymethylfurfural (HMF) or levulinic acid, HMF into 2,5-furandicarboxylic acids, vanillin into 2-methoxy-4-methylphenol, and other transformations using MOF-based catalysts with improved green credentials. The article also examines the reusability aspect, reactivity of the catalysts with MOFs, benefits, and potential drawbacks, as well as future perspectives.
Article
Energy & Fuels
Awais Ahmad, Mushkbar Zahra, Fakhar e Alam, Shafaqat Ali, Muhammad Pervaiz, Zohaib Saeed, Umer Younas, Muhammad Mushtaq, Saravanan Rajendran, Rafael Luque
Summary: Biochar has been recognized for its eco-friendly nature and ability to remove hazardous pollutants from the environment. Different alteration technologies have been proposed to enhance the removal capacity of biochar against these pollutants, including the use of nano-materials and biochar-based nano-composites. These composites have shown higher efficiency in removing and degrading toxic elements. The paper focuses on the production and modification of biochar through sustainable means and its applications in waste management, with a specific focus on bio-fuel and bio-energy production.
Review
Energy & Fuels
Awais Ahmad, Shumila Shaheen, Saadat Majeed, Muhammad Pervaiz, Zohaib Saeed, Umer Younas, Muhammad Sufyan Javed, Rafael Luque, Lalitha Gnanasekaran
Summary: The global energy demand and consumption have increased significantly due to population and economic growth. Investment in solar energy, bioenergy, and cost-effective energy storage devices has gained attention to address energy crises. This review focuses on the potential of nanotechnology in batteries, specifically metal/metalloid-based nanoparticles, due to their exceptional properties.
Correction
Chemistry, Physical
Ana Alice Farias da Costa, Alex de Nazare de Oliveira, Roberto Esposito, Christophe Len, Rafael Luque, Renata Coelho Rodrigues Noronha, Geraldo Narciso da Rocha Filho, Luis Adriano Santos do Nascimento
Article
Chemistry, Physical
Yi Tan, Zhi-Xiang Xu, Xue-Qin Ma, Shi-Yong Wu, Bo Zhang, Rafael Luque
Summary: To prepare low nitrogen content hydrochar, Na2SO3 and NaHSO3 were used as additives to remove nitrogen from sewage sludge during hydrothermal carbonization. The maximum removal efficiency of nitrogen in hydrochar can increase by 68.68% at 210 degrees C when 10% of Na2SO3 was added, indicating that Na2SO3 has a greater capability than NaHSO3. The key role of Na2SO3 is the degradation of extracellular polymeric substances (EPS) to release polysaccharides and destroy proteins structure, thereby inhibiting Maillard reaction and reducing nitrogen content in hydrochar.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Daniele Polidoro, Maurizio Selva, Rafael Luque
Summary: The catalytic transfer hydrogenolysis of aromatic ether bonds was successfully achieved under optimized reaction conditions, converting lignin into valuable chemicals. The reaction parameters were crucial to avoid the hydrogenation of the aromatic rings. The Ru/C catalyst demonstrated excellent stability, showing no noticeable activity loss even after six cycles of recycling.
MOLECULAR CATALYSIS
(2023)
Article
Environmental Sciences
Otoniel Anacleto Estrela Filho, Bryan Fernando Rivadeneira-Mendoza, Kevin Jhon Fernandez-Andrade, Luis Angel Zambrano-Intriago, Fausthon Fred da Silva, Rafael Luque, Fabiola D. S. Curbelo, Joan Manuel Rodriguez-Diaz
Summary: The considerable amount of produced water discharged by the oil industry can cause environmental imbalance due to its harmful components. This study investigated the adsorption capacity of Zinc Imidazolate Framework-8 (ZIF-8) for crude oil removal from synthetic produced water. ZIF-8 exhibited high crystallinity and thermal stability, and its adsorption process was found to be spontaneous and exothermic.
ENVIRONMENTAL RESEARCH
(2024)
Article
Environmental Sciences
Jennifer Maria Navia Mendoza, Bryan Fernando Rivadeneira Mendoza, Jaime Cevallos Mendoza, Alina M. Balu, Rafael Luque, Luis Angel Zambrano Intriago, Joan Manuel Rodriguez-Diaz
Summary: In this study, a hybrid material MIL-53(Al)@HC was synthesized and demonstrated to have excellent adsorption capability for Ibuprofen sodium salt and Metsulfuron-methyl in a binary system. The hybrid material showed in situ crystal growth capability and could remove >98% of the target substances at extreme conditions. The adsorption kinetics and equilibrium were well described by the pseudo-second order model and the Sips and Freundlich models.
ENVIRONMENTAL RESEARCH
(2024)
Article
Environmental Sciences
Zhi-Xiang Xu, Yi Tan, Xue-Qin Ma, Bin Li, Yong-Xing Chen, Bo Zhang, Sameh M. Osman, Jing-Yang Luo, Rafael Luque
Summary: This study presents a method for designing wood bio-adhesives using sewage sludge extracts (SSE). The SSE was obtained from sewage sludge using deep eutectic solvents, and then processed with glycerol triglycidyl ether (GTE) to disrupt protein structure. The bio-adhesive produced had sufficient wet shear strength and improved quality through Maillard reaction and dehydration. This method offers a more environmentally friendly and economically efficient approach for utilizing sewage sludge and developing bio-adhesives for the wood industry.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Haojie Li, Bingke Yang, Zhen Yao, Xuetao Wang, Kaiming Shen, Mengjie Liu
Summary: This study systematically investigates the influence of metal and nonmetal element doping on the photochemical properties of g-C3N4 for efficient catalytic AB hydrogen production. It provides a design method for high performance bifunctional catalysts of photocatalysis and metal catalysis. The results show that both non-metals (B, P) and metals (Ru, Ni) have efficient regulatory effects on the band structure of g-C3N4, resulting in a reduced band gap and improved hydrogen production. The study offers a theoretical method for the coupling of metal catalysis/photocatalysis ammonia borane to produce hydrogen.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Shrouq Mujahed, Davide Gandolfo, Luigi Vaccaro, Evgueni Kirillov, Dmitri Gelman
Summary: In this study, a high-valent Ru(IV) bifunctional catalyst was successfully applied for the hydrosilylation of various functional groups. The high-valent hydride complexes showed high chemoselectivity and affinity towards reducing polar bonds. The scope, limitations, and plausible mechanism of the reaction were described.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yongzhen Peng, Kongchen Xia, Qi Wu
Summary: In this study, we report an engineered cyclohexanone monooxygenase that can be used for the asymmetric synthesis of chiral alpha-deuterated carbonyl compounds via enantioselective reductive dehalogenation. The engineered enzyme exhibits good chemoselectivity, stereoselectivity, and d-incorporation, making it a promising method for the synthesis of deuterated drugs.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qi Yang, Ruixuan Xu, Hongqi Nie, Qilong Yan, Jun Liu, Jiuyu Chen, Yunlan Sun
Summary: The adsorption and decomposition processes of ammonium perchlorate (AP) on pure-Al and Al2O3/Al surfaces were investigated using density functional theory. The results showed that the pure-Al surface is more conducive to the decomposition of AP and the activation of NH3, while the Al2O3/Al surface promotes the disengagement of H and NH3 decomposition.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yudong Hu, Guochao Xu, Ye Ni
Summary: This study identified a novel phenylalanine dehydrogenase (QtPDH) with high catalytic efficiency and thermal stability, making it a promising biocatalyst for industrial production of bulky aromatic primary amines. QtPDH exhibited a broader substrate specificity and significantly longer half-life compared to BbPDH.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Weiling Zhao, Zhiling Huang, Hui Shen, Xianglong Li, Shaofen Zhao, Bo Xie, Shengjie Xia
Summary: This study investigated the effects of metal doping and crystal plane selection on the CO2 adsorption properties of MgO using density functional theory (DFT) methods. The results showed that the appropriate crystal plane and metal doping can improve the adsorption properties of MgO on CO2. The influence of different crystal planes and metal dopants on CO2 adsorption properties varied significantly. The research provides some references for experimental studies on CO2 adsorption by MgO by combining the dual modification of crystal plane and doped metal.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Jie Zhang, Jinwei Chen, Zongbo Shi, Junyu Zhao, Runsheng Zhuo, Ruilin Wang
Summary: In this study, a double-layered silicalite-1 support with high specific surface area was synthesized, and a magnesium modification strategy was adopted to improve the catalytic activity and stability of the zinc-based catalyst. The modified catalyst showed enhanced propylene selectivity and anti-coking property.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Pei-Sen Gao, Chang-Wang Pan, Cheng Liu, Wen -Tong Chen
Summary: Asymmetric electrocatalysis offers a unique approach to obtain enantioenriched molecules that are difficult to obtain through conventional methods. This study developed a novel bifunctional electrocatalyst, enabling the oxidative kinetic resolution of chiral 1,4-diols and gamma-lactones. The work demonstrates the potential of bifunctional electrocatalysis for asymmetric synthetic methods and its importance in the development of novel electrocatalytic methods.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Qinzhe Lin, Xuanjin Lv, Xianming Zeng, Mengning Zhong, Qiyun Wu, Huilin Ren, Shenpeng Xu, Wentian Chen, Wenting Du, Jun Li
Summary: The catalytic efficiency of engineered IRED M5 was found to be relatively low when tasked with a bulky amine substrate. Rational design led to the mutants M203V and F260A, with F260A exhibiting a substantial improvement in conversion and stereoselectivity. The study revealed the potential molecular mechanisms underlying the effect of F260A and M203V on catalytic performance.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhishuai Wang, Fengyun Su, Hailong Cao, Mengzhen Tian, Xiang Li, Haiquan Xie, Xiaoli Jin, Zhengdao Li, Xin Ying Kong
Summary: In this study, the efficiency of photocatalytic CO2 reduction was significantly enhanced by incorporating nickel oxide onto niobium pentoxide. The resulting catalyst showed remarkable methane and carbon monoxide production improvements.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
A. Yu. Sidorenko, Yu. M. Kurban, T. V. Khalimonyuk, I. V. Il'ina, N. S. Li-Zhulanov, O. S. Patrusheva, V. V. Goltsova, M. P. Bei, Zh. V. Ihnatovich, J. Warna, K. P. Volcho, N. F. Salakhutdinov, D. Yu. Murzin, V. E. Agabekov
Summary: This study provides a comprehensive investigation into the catalytic condensation of renewable 3-carene with formaldehyde for the one-step preparation of terpenoid trans-4-hydroxymethyl-2-carene. Various acids and alumino-silicates were found to catalyze the reaction, but the selectivity to the desired product was limited. Phosphoric acid showed the highest selectivity, and an excess of formaldehyde or catalyst loading significantly increased the yield of the target product. Water presence also led to increased selectivity. Additionally, a detailed mechanism for the 3-carene condensation with formaldehyde was proposed and confirmed through kinetic modeling.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Meng-Yu Rong, Jing Nie, Shen Li, Jun-An Ma
Summary: We synthesized a new class of chiral quaternary ammonium salts and used them as catalysts in phase-transfer catalytic asymmetric alkylation. By employing these catalysts, we obtained a series of chiral fluorinated aromatic alpha-amino acid derivatives with high yields and enantioselectivities.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Zhaozhou Wei, Guangtao Wei, Huixian Che, Deyuan Xiong, Linye Zhang, Ruihua Xue, Yalin Tang, Xuanli Lu
Summary: This study demonstrates that small-sized graphite crystallite and highly defective carbon-based catalysts can increase the -SO3H density of the catalysts and modulate their surface electronic properties, leading to improved efficiency in the alpha-pinene hydration reaction. The reduction of graphite crystallite size is considered a critical step in enhancing the selectivity of alpha-terpineol.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Kempanna S. Kanakikodi, Nagendra Kulal, K. S. Subramanya, M. S. Puneethkumar, Bhavana B. Kulkarni, Ganapati Shanbhag, Sanjeev P. Maradur
Summary: An effective and highly selective protocol for synthesizing asymmetric organic carbonates using dimethyl carbonate (DMC) as a reactant and solvent has been developed. The performance of CeO2 nanostructures with different morphologies in the carbonate interchange reaction (CIR) of alcohols was investigated, and the CeO2 nano-catalyst with rod morphology exhibited the highest oxygen vacancy and remarkable enhancement in conversion. The CeO2 characterization data revealed that the exposed active sites, defect density, coordination state of surface atoms, and reducibility of the catalytic materials are the contributing factors to its high catalytic activity. CeO2 can be easily recovered and reused for multiple cycles.
MOLECULAR CATALYSIS
(2024)
Article
Chemistry, Physical
Yanzhao Gao, Xianglei Meng, Shiqi Huang, Hui Wu, Liantao Jiang, Yu Zhou, Yuting Song, Yanyan Diao
Summary: Gamma alumina modified with alkaline earth metal shows improved catalytic performance for hydrogenation reactions. Pd catalysts supported by Al2O3 and Mg-modified Al2O3 were synthesized and their structure, composition, and surface acidity were investigated. The results showed that Pd/MgO-Al2O3-2 catalyst exhibited the best catalytic performance due to its metallic state palladium and weak acid sites.
MOLECULAR CATALYSIS
(2024)
