Article
Polymer Science
Abhishek K. Pathak, Lekha Sharma, Hema Garg, Tomohiro Yokozeki, Sanjay R. Dhakate
Summary: In situ chemical linkage between amine-functionalized graphene and epoxy polymer has been successfully achieved, leading to improved mechanical and thermal properties of nanocomposites. The formation of a chemical bond between the graphene and epoxy is demonstrated and its mechanism is derived based on experimental evidence.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Review
Chemistry, Multidisciplinary
Simona Summonte, Giuseppe Francesco Racaniello, Angela Lopedota, Nunzio Denora, Andreas Bernkop-Schnuerch
Summary: Thiomers, such as thiolated hyaluronic acid and chitosan, are widely studied for their high reactivity in hydrogel synthesis. They exhibit in situ gelling properties and can undergo various click reactions, making them versatile materials for tissue engineering, regenerative medicine, and drug delivery.
JOURNAL OF CONTROLLED RELEASE
(2021)
Article
Materials Science, Multidisciplinary
Hongyi Song, Shuhai Zhao, Peiyan Chen, Yongjin Mai
Summary: In this study, copper ions were incorporated into GO nanosheet coatings to enhance their performance as solid lubricants. The modified coatings showed improved durability and low friction coefficient, making them suitable for various mechanical engineering applications.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Chemistry, Physical
Yao Lu, Lili Liu, Yangyang Pu, Yue Liu, Na Li, Zhaoxia Hu, Shouwen Chen
Summary: In this study, a novel multi-cationic oligomer was used as a cross-linker to prepare cross-linked QPAES/QBGO membranes with well-defined ionic channels and phase separation characteristics. The cross-linked membrane showed improved ionic conductivity, chemical stability, and power density compared to the control membrane. This novel design strategy holds broad prospects for the development of new polymer electrolyte membrane materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Junmo Jeon, Young-Kwan Kim
Summary: Graphene oxide is functionalized with ethylenediaminetetraacetic acid to improve its dispersibility and enhance mechanical properties. The functionalized graphene oxide shows a distinct structure and has a nematic liquid-crystalline phase. Ionic cross-linking with divalent cations further enhances the mechanical properties. This study suggests that ethylenediaminetetraacetic acid functionalization improves the potential of graphene oxide derivatives as a high-performance structural material.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Zhenxin Zhao, Jianming Liao, Ruijie Shi, Xuan Zhao, Zikang Wang, Jiajun Li, Qing Li, Daxiang Yang, Ming Nie, Yuping Liu
Summary: This work presents a new method for developing stable and efficient oxygen evolution reaction (OER) catalysts. Reduced graphene oxide (rGO) composite Ni3S2 microspheres grown directly on nickel foam (Ni3S2-rGO/NF) were prepared and showed excellent OER catalytic activity and stability, with an overpotential of 303 mV at the current density of 100 mA cm-2. The synergistic effect of Ni3S2 microspheres and rGO was the main reason for enhancing the OER activity of Ni3S2-rGO/NF.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Applied
Bishnupad Mohanty, Shraddhanjali Senapati, Arijit Mitra, Rajaram Bal, Bijayalaxmi Jena
Summary: The uniform and octahedral shaped Mn3O4 nanoparticles are successfully synthesized and anchored on reduced graphene oxide (rGO) sheets by a simple hydrothermal method. The rGO-Mn3O4 composite exhibits higher OER activity and durability in 1.0 M KOH, with smaller overpotential, lower Tafel slope, higher TOF value, high faradaic efficiency, and long-term durability.
Review
Polymer Science
Yasemin Fadil, Stuart C. Thickett, Vipul Agarwal, Per B. Zetterlund
Summary: Graphene with extraordinary properties is difficult to be dispersed in synthetic polymers, leading to challenges in preparing homogeneous polymer nanocomposites. The synthesis of polymer/graphene nanocomposites via emulsion-based approaches is a vibrant research field with significant potential for future advancements.
PROGRESS IN POLYMER SCIENCE
(2022)
Article
Engineering, Environmental
Antonysamy Jeyaseelan, Ayman A. Ghfar, Mu Naushad, Natrayasamy Viswanathan
Summary: The study developed amine functionalized graphene oxide (AGO) with high defluoridation capacity for fluoride removal. Through optimization of parameters and investigation of adsorption isotherms, kinetics and thermodynamics, the fluoride removal mechanism of AGO was found to be electrostatic attraction.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Jiyan Xie, Chen Li, Jinan Niu, Shenghui Zhang, Xuemei Ou, Peizhong Feng, Hermenegildo Garcia
Summary: Porous few-layer NiFe-layered double hydroxide/graphene oxide composite electrocatalysts exhibit excellent oxygen evolution reaction performance through optimized ratio, with the PLDH/0.1G0 sample showing superior characteristics compared to commercial IrO2 and pure LDH.
Article
Nanoscience & Nanotechnology
Yanchi Liu, Shanfeng Zhu, Jinchen Fan, Wenyao Guo, Yulin Min, Xuesong Jiang, Jin Li
Summary: Efficient dispersion of nanoparticles (NPs) in coatings, inks, and related materials is a crucial challenge. Physical adsorption and chemical modification are common methods, but suffer from desorption and limited versatility. To address these issues, we developed a novel photo-cross-linked polymeric dispersant, bPEA, which forms a dense and stable shell on the surface of pigment NPs through physical adsorption and subsequent chemical photo-cross-linking. These dispersants show high stability and compatibility with various printing methods, providing uniformity, color fastness, and less color shading in ornamental products.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Chemical
Shuwei Liang, Yimeng Song, Zhiming Zhang, Bowen Mu, Run Li, Ying Li, Hao Yang, Meidi Wang, Fusheng Pan, Zhongyi Jiang
Summary: By intercalating SCD into the interlayer pores of GO membranes, the ethanol dehydration performance has been significantly enhanced, leading to improved permeation flux and separation factor. The GO-SCD membranes demonstrate excellent water affinity and thermal stability, showing potential for future applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Huaitao Zhang, Xuebing Hu, Boshen Yang, Qintao Zhou
Summary: In order to address the poor structural stability of graphene oxide (GO) membrane, a simple and effective cross-linking technology was used to create a high-performance GO membrane. Different cross-linking agents were employed to crosslink GO nanosheets and porous alumina substrate, and their effects were studied. The cross-linked GO membrane exhibited exceptional structural stability and superior separation performance.
Article
Chemistry, Multidisciplinary
Matthew L. Schneider, Adrian W. Markwell-Heys, Oliver M. Linder-Patton, Witold M. Bloch
Summary: By tuning the basicity of aniline-functionalized ligands, soluble amine-functionalized metal-organic cages can be self-assembled, allowing control over the coordinative propensity of the exterior amine and the formation of a crystalline two-dimensional metal-organic framework. The nucleophilicity of the exterior amine can be accessed in solution to generate a cross-linked cage polymer.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Sally El Meragawi, Dilusha Cooray, Mainak Majumder
Summary: Nanofiltration membranes deteriorate in highly concentrated chlorinated environments, but a novel fabrication strategy using Polyethyleneimine and siloxane crosslinking chemistries can improve chlorine-stability of graphene oxide nanosheets.
SEPARATION SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
N. S. Hassan, A. A. Jalil, C. N. C. Hitam, M. H. Sawal, M. N. S. Rahim, I. Hussain, N. W. C. Jusoh, R. Saravanan, D. Prasetyoko
Summary: Fibrous silica tantalum (FSTa) and metal oxides (AgO, CuO, ZnO)/FSTa catalysts were prepared and characterized for the photocatalytic oxidative desulfurization (PODS) of dibenzothiophene (DBT). The addition of metal oxides decreased the efficiency of PODS, possibly due to mismatched redox potentials. Among the metal oxides loaded FSTa, Zn/FSTa exhibited higher desulfurization rate and could directly oxidize DBT into dibenzothiophene sulfone (DBTO2). The kinetics study showed that the photodegradation over Zn/FSTa followed the pseudo-first-order and adsorption was the rate-limiting step.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Pragati A. Shinde, Nilesh R. Chodankar, Mohammad Ali Abdelkareem, Swati J. Patil, Young-Kyu Han, Khaled Elsaid, Abdul Ghani Olabi
Summary: This study demonstrates a versatile in situ approach to design nanostructured transition metal selenides (TMSs) for high-energy solid-state hybrid supercapacitors (HSCs). By directly anchoring NiCuSe and FeSe electrodes on Cu foam, superior electrochemical features are achieved due to their excellent electrical conductivity. This work offers a feasible route to develop high-energy battery-type electrodes for next-generation hybrid energy storage systems.
Article
Chemistry, Physical
Khaled Elsaid, Shakil Ahmed, Ahmed Badreldin, Ahmed Abdel-Wahab, Zafar Khan Ghouri, Mohamed Mahmoud Nasef
Summary: This study successfully overcame the kinetic barriers and demonstrated good alkaline oxygen evolution reaction (OER) activity by synthesizing self-supported carbon nanowires (CNWs) decorated with bimetallic palladium-cerium PdCe alloys nanoparticles (NPs). The resulting PdCe/CNWs electrode showed low overpotential and Tafel slope, and exhibited comparable performance to the benchmark catalyst RuO2.
MOLECULAR CATALYSIS
(2022)
Review
Energy & Fuels
Hussein M. Maghrabie, Khaled Elsaid, Enas Taha Sayed, Ali Radwan, Ahmed G. Abo-Khalil, Hegazy Rezk, Mohammad Ali Abdelkareem, A. G. Olabi
Summary: This paper introduces the importance and application of phase change materials (PCM) in thermal energy storage systems, and proposes a method of improving PCM thermal conductivity by adding nanoparticles. The study results show that nano-enhanced phase change materials (NePCM) have superior heat transfer characteristics, and have the potential for cooling photovoltaic cells.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Mohammad Ali Abdelkareem, Hussein M. Maghrabie, Ahmed G. Abo-Khalil, Ohood Hameed Kadhim Adhari, Enas Taha Sayed, Ali Radwan, Khaled Elsaid, Tabbi Wilberforce, A. G. Olabi
Summary: This article addresses the crucial issue of the continuous rapid growth of the world population and the need for ambitious innovations like electric vehicles (EVs) to reduce carbon emissions in the transportation sector. The control of the working temperature in lithium-ion batteries (LIBs) for EVs is emphasized as a critical concern. Various cooling methods, including those utilizing nanofluids, are reviewed for battery pack thermal management. The combination of nanofluids with phase change materials (PCMs) and heat pipes (HPs) for battery thermal management systems (BTMSs) is also discussed. It is found that nanofluids effectively improve the thermal management of batteries, and hybrid cooling systems based on nanofluids outperform single BTMSs in terms of temperature uniformity. Additionally, the article highlights the need for further research to enhance the technology and advancements of EVs.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Energy & Fuels
Abdul Ghani Olabi, Tabbi Wilberforce, Abdulrahman Alanazi, Parag Vichare, Enas Taha Sayed, Hussein M. Maghrabie, Khaled Elsaid, Mohammad Ali Abdelkareem
Summary: Fuel cells have been widely studied for their high conversion efficiency and flexibility. This work delved into the components and manufacturing processes of proton exchange membrane fuel cells, analyzing challenges and proposing mitigation strategies to aid in fuel cell development.
Article
Chemistry, Physical
Ummi Kalsum Hasanah Mohd Nadzim, Nur Hanis Hayati Hairom, Mohamad Alif Hakimi Hamdan, Mohd Khairul Ahmad, Aishah Abdul Jalil, Nurfatehah Wahyuny Che Jusoh, Sofiah Hamzah
Summary: This study focuses on the performance of different morphologies of zinc oxide nanoparticles in thiophene desulfurization. The results show that flower-like zinc oxide flakes exhibit the best performance in thiophene desulfurization. Moreover, all zinc oxide morphologies apply to pseudo-second-order models. The optimal conditions for thiophene desulfurization are pH 7, 0.05 g/L zinc oxide flakes loading, and 90 minutes of contact time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Green & Sustainable Science & Technology
A. G. Olabi, Tabbi Wilberforce, Khaled Elsaid, Enas Taha Sayed, Hussein M. Maghrabie, Mohammad Ali Abdelkareem
Summary: Carbon capture is a key action in mitigating climate change and global warming by reducing carbon emissions. Various process industries, such as cement, iron and steel, oil refinery, and chemicals, are important sources of carbon emissions and provide potential opportunities for carbon capture. However, the main challenge lies in the high cost of implementing carbon capture in process industries.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Hegazy Rezk, Irik Z. Mukhametzyanov, Mohammad Ali Abdelkareem, Tareq Salameh, Enas Taha Sayed, Hussein M. Maghrabie, Ali Radwan, Tabbi Wilberforce, Khaled Elsaid, A. G. Olabi
Summary: Solar thermal power technologies have the potential to replace conventional fossil fuel power plants, and different technologies have varying technical, economical, and environmental aspects. By using multi-criteria decision making models, the best solar thermal power technology can be determined, with solar power dish technology (A4) being the top choice.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Review
Green & Sustainable Science & Technology
Hussein M. Maghrabie, Mohammad Ali Abdelkareem, Khaled Elsaid, Enas Taha Sayed, Ali Radwan, Hegazy Rezk, Tabbi Wilberforce, Ahmed G. Abo-Khalil, A. G. Olab
Summary: This article introduces the operation and performance of solar chimney in buildings, and explores the methods to enhance natural ventilation and energy efficiency through solar chimney. The authors emphasize that solar chimney is a promising passive cooling solution in hot and humid climates.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Review
Environmental Sciences
Ahmad Masudi, Oki Muraza, Nurfatehah Wahyuny Che Jusoh, Ubaidillah Ubaidillah
Summary: This study comprehensively examines the factors affecting biodiesel stability. The results show that isomerization can improve the oxidative stability and cold flow properties of biodiesel. Polymers, surfactants, or small molecules with low melting points can also improve its cold flow properties. Enzymatic transesterification can remove monoacylglycerols from oil feedstock. Furthermore, combining natural antioxidants can slow lipid oxidation, especially when storing biodiesel in materials such as stainless steel, carbon steel, or aluminum. The study also recommends combining green diesel and biodiesel to improve stability, and co-producing green diesel at oil refineries with limited hydrogen supply.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
A. H. Hatta, A. A. Jalil, M. Y. S. Hamid, N. S. Hassan, I. Hussain, N. W. C. Jusoh
Summary: Aspherical nickel-loaded fibrous silica mesoporous ceria (Ni/FSCe) with a cockscomb-like structure has been synthesized and used for CO methanation. The Ni/FSCe showed significantly improved catalytic capability compared to conventional Ni-Ce/KCC-1. This can be attributed to the high amount of inter-nanoparticle oxygen vacancies, well-dispersed Ni, and better metal-support interactivity, which lead to better adsorption and inhibition of carbon deposition.
Article
Energy & Fuels
Najrul Hussain, Hussain Alawadhi, A. G. Olabi, Khaled Elsaid, Mohammad Ali Abdelkareem
Summary: This study focused on the development of an efficient electrocatalyst composed of a cost-effective metal oxide and two-dimensional layered materials. A tricomponent Cu2O-g-C3N4/MoS2 composite material was synthesized via a simple procedure and showed excellent catalytic efficiency in electrochemical hydrogen evolution. The Cu2O-g-C3N4/MoS2 composite material exhibited a low overpotential and a high total current density, indicating its superior performance. The reaction kinetics and durability of the catalyst were also investigated and explained.
Article
Green & Sustainable Science & Technology
Enas Taha Sayed, A. G. Olabi, Khaled Elsaid, Muaz Al Radi, Concetta Semeraro, Mohammad Hossein Doranehgard, Mohamed Elrayah Eltayeb, Mohammad Ali Abdelkareem
Summary: Using various renewable energy resources to power desalination plants is an encouraging choice, especially in arid and remote areas. However, the unpredictable load demands and intermittency nature of these resources make designing such systems difficult. This work discusses various artificial intelligence techniques to enhance RES-powered desalination systems.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Thermodynamics
Mohammad Ali Abdelkareem, Mohamed S. Mahmoud, Khaled Elsaid, Enas Taha Sayed, Tabbi Wilberforce, Mohammed Al-Murisi, Hussein M. Maghrabie, A. G. Olabi
Summary: This article discusses the unique utilization of nanofluids in thermoelectric generator (TEG) applications, specifically in waste heat recovery. Nanofluids have been shown to significantly improve heat transfer efficiency and enhance TEG performance. However, further research and development are needed to achieve commercialization of TEG systems.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
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)
