Article
Chemistry, Multidisciplinary
Bhavna Saini, Anup Prakash Tathod, Sandeep K. Saxena, Selvamani Arumugam, Nagabhatla Viswanadham
Summary: In this study, a metal-free mordenite-based catalyst was used for the acetalization of crude glycerol to produce solketal. The catalyst showed high catalytic activity and tolerance towards impurities, and achieved a high yield of solketal under mild reaction conditions. The results suggest that the catalyst has potential for large-scale applications.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Energy & Fuels
Raphael Rodrigues, Mikaela S. Santos, Renan S. Nunes, Wagner A. Carvalho, Georgia Labuto
Summary: Chemically activated carbons derived from yeast biomass waste were modified with HNO3 to enhance surface acid features for application as catalysts in solvent-free solketal production, achieving high glycerol conversion rates and selectivity towards solketal with remarkable efficiency in consecutive runs. Characterization of the activated carbons was done through various techniques including N2 adsorption/desorption, thermal analysis, elemental analysis, surface functional group titration (Boehm titration), X-ray diffraction, and Raman spectroscopy.
Article
Biochemistry & Molecular Biology
Diana Juliao, Fatima Mirante, Salete S. Balula
Summary: This work presents an efficient and fast method for valorizing glycerol, the main waste from the biodiesel industry. The acetalization of glycerol with acetone is an effective strategy to produce solketal, a valuable fuel additive component. The catalytic efficiency of different commercial heteropolyacids (HPAs) was compared and it was found that HPAs demonstrated high efficiency and selectivity under sustainable conditions.
Article
Engineering, Chemical
Fabrizio Roncaglia, Luca Forti, Sara D'Anna, Laura Maletti
Summary: Utilizing bisulfate on silica as a catalyst, and with the assistance of proper anhydrification technique, glycerol can be efficiently converted into solketal with isolated yields of 96% achieved in mild conditions on a 100 g scale.
Article
Chemistry, Physical
Hussein Hussein, Carmela Aprile, Michel Devillers
Summary: Novel mesoporous niobosilicate materials with homogeneous dispersion of niobium species were synthesized via impregnation method. The catalysts showed high accessibility of active sites and suitable combination of acid sites, resulting in excellent catalytic performance. Moreover, the materials exhibited good reusability and high stability.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Engineering, Environmental
Laura Aguado-Deblas, Rafael Estevez, Marco Russo, Valeria La Parola, Felipa M. Bautista, Maria Luisa Testa
Summary: Sulfonic and propylsulfonic silica-based catalysts were synthesized and used in the acetalization reaction of glycerol under microwave irradiation. The sulfonic materials prepared by hydrothermal grafting showed excellent performance in terms of activity, selectivity and stability.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Samahe Sadjadi, Sara Tarighi, Negar Sajadian Moussavi, Niloofar Ahadi
Summary: This research focuses on the selective acetalization of glycerol to solketal using a designed catalyst. The catalyst was prepared by decorating bentonite clay with an acidic polymer containing sulfonic acid and carboxylic acid groups, followed by conversion of the carboxylic acid groups to ionic liquids. The catalyst with optimized loading of phosphotungstic acid showed high catalytic activity, achieving 100% conversion and 99% yield to solketal under solvent-free conditions. The presence of ionic liquid in the catalyst structure played a crucial role in its selectivity.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Chemistry, Physical
Geovane Balotin, Juliana De Almeida, Robson S. Silva, Wagner A. Carvalho, Claudio T. Carvalho, Raphael Rodrigues
Summary: This study presents a new strategy to enhance the surface acidity and textural features of activated carbons from a lignocellulosic biomass waste. By reconfiguring the structure and composition of the selected precursor, the modified activated carbons exhibited high surface area and acidity, making them effective catalysts for glycerol conversion to solketal. The catalysts demonstrated high glycerol conversion and selectivity towards solketal, as well as good reusability. The various acid strengths present in the reactive sites played a crucial role in improving the catalytic performance. The activated carbons were characterized using various techniques including N₂ adsorption/desorption isotherms, thermal analysis, elemental analysis, surface functional group titration, X-ray diffraction, scanning electron microscopy, and FTIR spectroscopy.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Isabel C. M. S. Santos-Vieira, Ricardo F. Mendes, Filipe A. Almeida Paz, Joao Rocha, Mario M. Q. Simoes
Summary: Biodiesel production generates surplus glycerol, which can be transformed into oxygenated fuel additives like solketal using coordination polymer catalysts. These additives not only enhance biodiesel performance but also contribute to better combustion efficiency and octane number.
Article
Chemistry, Multidisciplinary
Taraneh Hajiashrafi, Mohaddeseh Sheikholeslami, Maryam Ahmadi Arjanaki, Sara Tarighi, Zhifang Guo, Peter C. C. Junk
Summary: Two lanthanide-coordination polymers with benzophenone-4,4'-dicarboxylate linker were synthesized and characterized. Both compounds showed chiral three-dimensional uninodal 5-connected net topology. These Ln-CPs were used as heterogeneous catalysts for the acetalization of glycerol, demonstrating their effectiveness as potential Lewis acid catalysts for chemical transformations.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Energy & Fuels
Supongsenla Ao, Lana A. Alghamdi, Thomas Kress, Manickam Selvaraj, Gopinath Halder, Andrew E. H. Wheatley, Samuel Lalthazuala Rokhum
Summary: The conversion of glycerol to solketal, a fuel additive, was successfully achieved using a sulfonic acid-functionalized aromatic carbonaceous material as a heterogeneous catalyst under microwave irradiation. The optimal glycerol:acetone molar ratio for the acetalization reaction was found to be 1:5, and a catalyst dosage of 8 wt% at 70 degrees C for 10 minutes resulted in a high conversion of bioglycerol with 100% selectivity to solketal. The acetalization reaction had an activation energy of 35.8 kJ mol 1, and the catalyst showed modest loss in activity over six cycles.
Article
Chemistry, Multidisciplinary
Tiantian Zhang, Xiulan Xin, Shan Liao, Hongqin Liu, Yang Yu, Baocai Xu
Summary: Porous spherical alumina (gamma-Al2O3) was prepared as catalyst support using sol-gel method, and FeCl3/gamma-Al2O3 materials were prepared by impregnation method. These materials showed considerable catalytic performance in the Solketal production process by acetalization of acetone and glycerol. The catalytic activity was attributed to the high thermal stability, large specific surface area, and rich pore structure of gamma-Al2O3 support, which provided abundant active sites for FeCl3 in the acetalization reaction. The FeCl3/gamma-Al2O3 catalyst was easily recoverable and reusable, indicating its great potential for future large-scale research and application.
Article
Engineering, Environmental
Yushan Li, Qingqing Xie, Mengyu Wang, Zhenyang Wang, Jiefeng Liu, Yiyao Du, Dongpei Zhang, Mengyuan Liu, Guangyu Zhang, Xin Jin, Chaohe Yang
Summary: A dual designing strategy involving Fe3+ modified Bronsted acidity and chlor-otrimethylsilane (CTS) altered hydrophilicity was proposed and validated for enhanced activity and stability of NaY catalysts in solketal synthesis from bio-oxygenates. Fe3+ exchanged NaYs showed a shortened Si-OH bond and electronically reconfigured Fe3+ sites, resulting in a 4-fold activity enhancement. Furthermore, CTS modified FeY materials improved the acetali-zation of glycerol by 18-fold and displayed remarkable stability against impurity molecules.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Imtisal Zahid, Muhammad Ayoub, Bawadi Bin Abdullah, Muhammad Hamza Nazir, Zulqarnain, Mariam Ameen Kaimkhani, Farooq Sher
Summary: This study introduces an ecofriendly process of solketal synthesis from glycerol and acetone with a novel metakaolin clay catalyst, which can enhance the octane number and control emissions in biodiesel or gasoline. The kaolin clay catalysts used are low cost, abundantly available and show promising applications for solketal synthesis. By activating the raw kaolin clay and optimizing reaction conditions, a high solketal yield can be achieved.
Article
Chemistry, Applied
Kankana Saikia, Kalyani Rajkumari, N. Shaemningwar Moyon, Sanjay Basumatary, Gopinath Halder, Umer Rashid, Samuel Lalthazuala Rokhum
Summary: Research on biomass-based catalyst is important for the sustainability of the biodiesel industry. In this study, a cellulose-based heterogeneous solid carbon catalyst was synthesized and successfully applied in the acetalization reaction of glycerol to produce the biofuel additive solketal. The catalyst exhibited excellent catalytic activity and stability.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
N. Shiva Prasad, N. Lakshmi Gayatri, B. Naga Sandhya, S. Kalyani, Suresh K. Bhargava, Sundergopal Sridhar
Summary: The present study focuses on synthesizing novel high-performance acrylic acid grafted polyethersulfone (PES) ultrafiltration (UF) membranes for purification of small therapeutic biomolecules. The membranes were synthesized by adding polyethylene glycol (PEG) as a pore former and grafting acrylic acid (AA) onto PES under UV-induced photo grafting. Scanning electron microscopy revealed that PEG additive greatly influenced the pore density on the membrane surface. The membranes showed improved pure water flux and selective removal of uremic toxins, while maintaining high rejection rates for insulin and cobalamin biomolecules.
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
(2022)
Review
Environmental Sciences
Ragini Singh, Akhela Umapathi, Gaurang Patel, Chayan Patra, Uzma Malik, Suresh K. Bhargava, Hemant Kumar Daima
Summary: Nanozymes are nanomaterials that have enzyme-like properties and unique physical and chemical characteristics. They have shown great potential in environmental monitoring and remediation of pollutants, including heavy metals and organic compounds. However, their inherent toxicity needs to be evaluated and monitored to ensure their safe use.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Luqman H. Hashim, Ahmed Halilu, Yahaya Balarabe Umar, Mohd Rafie Bin Johan, Mohamed Kheireddine Aroua, Paramita Koley, Suresh K. Bhargava
Summary: This study focuses on the design and synthesis of highly active bifunctional catalysts for the conversion of furfural to furfuryl acetate. The catalysts with lower lattice strain exhibited higher catalytic activity.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Electrochemistry
Lizhi Qian, Jinliang Li, Gongxu Lan, Yuan Wang, Sufeng Cao, Lu Bai, Runguo Zheng, Zhiyuan Wang, Suresh K. Bhargava, Hongyu Sun, Hamidreza Arandiyan, Yanguo Liu
Summary: Transition metal oxide (TMO)-based anodes attract attention for lithium storage due to their high capacity, easy synthesis, and improved battery safety. The electrochemical performance of TMO anodes can be significantly improved through configurational entropy optimization. For example, a high-entropy oxide (FeCoNiCrCu)(3)O-4 with low potential and high capacity is synthesized. In both half-cell and full-cell configurations, the (FeCoNiCrCu)(3)O-4 electrode shows excellent performance with high specific capacity and low discharge voltage.
Article
Chemistry, Inorganic & Nuclear
Robert Gericke, Martin A. Bennett, Steven H. Priver, Suresh K. Bhargava
Summary: A series of mono and double bridged heterobimetallic d(8)-d(10) complexes with a [MM'](3+) core (M = Ni, Pt; M' = Cu, Ag, Au) were synthesized. The compounds have short metal-metal separations and metallophilic bonding interactions. Analysis using DFT showed the bonding trends between the metals.
INORGANIC CHEMISTRY
(2023)
Review
Chemistry, Physical
Hamidreza Arandiyan, Putla Sudarsanam, Suresh K. Bhargava, Adam F. Lee, Karen Wilson
Summary: Biomass is a renewable energy source that is being increasingly utilized due to concerns about climate change caused by fossil fuel consumption. Waste biomass-derived fuels and chemicals offer a solution to reduce reliance on fossil fuels and achieve "Net Zero 2050 CO2 emissions" with environmental, health, and economic benefits. This review focuses on the use of perovskite oxide catalysts for biomass valorization, discussing their structure-reactivity relationships in various reactions. The study highlights the prospects and challenges for the broader application of perovskite oxide catalysts in biomass valorization.
Article
Geochemistry & Geophysics
Md Khairul Islam, Michael Somerville, Mark I. Pownceby, James Tardio, Nawshad Haque, Suresh Bhargava
Summary: Printed circuit boards (PCBs) from antiquated electronic goods were processed through pyrometallurgical route to separate alloy and slag phases. The addition of B2O3 flux, along with CaO and SiO2, decreased the melting temperature and improved the recovery of valuable metals at 1350°C smelting temperature. A fluxing strategy for smelting e-waste PCBs containing high Al2O3 was proposed based on the experimental findings of this research.
Review
Immunology
K. Swetha, Niranjan G. Kotla, Lakshmi Tunki, Arya Jayaraj, Suresh K. Bhargava, Haitao Hu, Srinivasa Reddy Bonam, Rajendra Kurapati
Summary: Lipid nanoparticles (LNPs) are an advanced technology for efficient in vivo delivery of exogenous mRNA, especially for COVID-19 vaccines. LNPs consist of four different lipids: ionizable lipids, helper or neutral lipids, cholesterol, and lipids attached to polyethylene glycol (PEG). This review presents recent advances and insights in LNPs design, composition, and properties, with a focus on COVID-19 vaccine development. The role of ionizable lipids in mRNA vaccines and the use of LNPs as effective delivery vehicles for vaccination, genome editing, and protein replacement therapy are discussed.
Review
Engineering, Biomedical
N. P. Navya, Sunil Mehla, Amrin Begum, Harit K. Chaturvedi, Ruchika Ojha, Christian Hartinger, Magdalena Plebanski, Suresh K. Bhargava
Summary: Nanomaterials that mimic natural enzymes in the human body are known as nanozymes and have diagnostic, imaging, and therapeutic capabilities. Smart nanozymes exploit the tumor microenvironment to provide effective cancer therapy. This review focuses on the design and synthesis of nanozymes for cancer therapy, including understanding the tumor microenvironment and surface chemistry for site-specific therapy.
ADVANCED HEALTHCARE MATERIALS
(2023)
Article
Engineering, Chemical
P. Sudhakar, Alka Kumari, Sazal Kundu, Vivek Ravi Sankar, Prathap Kumar Thella, Kalpit Shah, Suresh K. Bhargava
Summary: In this study, antisolvent crystallization of L-aspartic acid (L-ASP) was optimized using response surface methodology (RSM) and a focused beam reflectance measurement (FBRM) tool. Important process parameters such as storage temperature, stirrer velocity, storage time, and solvent ratio were identified to significantly improve the yield and quality of the product, while chord length distribution (CLD) data was obtained through FBRM. The results showed that 2-propanol was a more effective antisolvent than methanol for L-ASP crystallization. Temperature was found to have a critical effect on crystal formation, with crystals forming between 298.15 and 303.15 K. ANOVA results confirmed the significant impact of all studied variables on the yield and CLD. The optimum crystallization conditions were determined as 18 h, stirrer velocity of 200 rpm, distilled water-formic acid/IPA ratio of 1:3 (v/v), and storage temperature of 298.15 K. A quadratic response surface model satisfactorily described the crystallization of L-ASP with an R2 of 0.99 and a deviation of 1.2%.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Gongxu Lan, Huilin Fan, Yuan Wang, Hamidreza Arandiyan, Suresh K. Bhargava, Zongping Shao, Hongyu Sun, Yanguo Liu
Summary: The surface atomic arrangement and defective structures of electrocatalysts play a crucial role in determining their catalytic activity and selectivity. In this study, alpha-Fe2O3 nanosheets with surface oxygen vacancies were synthesized and their oxygen vacancy concentration was varied to study their oxygen reduction reaction (ORR) performance. The results showed that increasing the oxygen vacancy concentration improved the ORR activity up to a certain point, but further increase deteriorated the crystalline quality and affected the performance.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Chemistry, Physical
Pengcheng Mao, Hamidreza Arandiyan, Sajjad S. Mofarah, Pramod Koshy, Cristina Pozo-Gonzalo, Runguo Zheng, Zhiyuan Wang, Yuan Wang, Suresh K. Bhargava, Hongyu Sun, Zongping Shao, Yanguo Liu
Summary: Rechargeable sodium-air batteries have gained extensive attention and developed rapidly in recent years for electrochemical energy storage applications due to their low costs, abundance of precursor resources, and high energy density. However, challenges such as poor charge-discharge reversibility at the cathode and the formation of sodium dendrites at the anode still need to be addressed. Therefore, designing efficient and stable air cathode materials is crucial for the development and practical application of sodium-air batteries.
Review
Chemistry, Multidisciplinary
Uzma Malik, Roxanne Hubesch, Paramita Koley, Maciej Mazur, Sunil Mehla, Sai Kishore Butti, Milan Brandt, P. R. Selvakannan, Suresh Bhargava
Summary: Combining additive manufacturing with photocatalytic and plasmonic functionalities has promising applications in next-generation SERS. Laser powder bed fusion is a mature technique for manufacturing metallic structures, allowing the printing of complex internal structures. This feature article elaborates on the grafting of plasmonic and semiconductor nanoparticles on LPBF manufactured metallic substrates, showcasing the potential for tailoring substrate properties.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Sunil Mehla, Sivacarendran Balendhran, Suresh K. Bhargava
Summary: This study investigates the impact of variations in the morphology of sunflower mimic metasurfaces on their plasmonic activity using experimental studies and finite difference time domain (FDTD) simulations. The study found that light polarization and morphological features such as dendrite shape, aspect ratio, and packing density play an important role in the distribution of enhanced electric field and plasmonic hot spots.
JOURNAL OF MATERIALS CHEMISTRY C
(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)
