Article
Chemistry, Applied
Kalina Grzelak, Rouzana Pulikkal Thumbayil, Soren Kegnaes, Maciej Trejda, Anders Riisager
Summary: The study demonstrates that the new Pd/Ce-MCF catalytic system designed based on mesocellular foam supports with Ce and Ca-Nb shows superior stability and high selectivity for the conversion of acetone to methyl isobutyl ketone.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Zhiguo Lv, Yan Zhang, Yiming Gong, Zhenmei Guo, Chao Zhang
Summary: A Pd/Al2O3-CeO2 nanosheets catalyst was successfully prepared for the conversion of acetone to methyl isobutyl ketone (MIBK). The catalyst exhibited high catalytic activity and selectivity, and DFT calculations showed that Pd/Al2O3-CeO2 could increase the electron activity of acetone and facilitate its hydrogenation process.
Article
Chemistry, Multidisciplinary
Kalina Grzelak, Maciej Trejda, Anders Riisager
Summary: Copper-containing materials based on Ce- and Ca-Nb-mesocellular foam silica supports were prepared and applied as catalysts for the gas-phase reductive condensation of acetone. The properties of these materials, the interaction of metal species, and their role in the catalytic process were investigated. The results showed that the Cu/Ce-MCF catalyst exhibited high acetone conversion and MIBK selectivity at 250°C, indicating a synergistic effect of Cu2+, Cu-0, and CeO2 species.
Article
Chemistry, Physical
Melike Caliskan, Talat Baran
Summary: A new nanocatalyst system, named Pd NPs@ZnAl LDH-Sch, was developed by immobilizing Pd nanoparticles on Schiff base-functionalized Zn-Al layered double hydroxide. This nanocatalyst displayed tolerance to various functional groups and showed excellent performance in the synthesis of benzonitriles. It acts heterogeneously, allowing for easy recovery and reuse.
APPLIED CLAY SCIENCE
(2022)
Review
Chemistry, Physical
Zhihui Wang, Wei Zhang, Cuiqing Li, Chen Zhang
Summary: Layered double hydroxides (LDHs) are widely used in various fields due to their unique structural advantages, and are capable of synthesizing metal catalysts with high metal dispersion, tunable acid-base properties, and strong metal-support interaction. LDH-derived materials show great potential as catalysts in hydrogenation and hydrogenolysis reactions, as indicated by the rapid development in this field with over 200 papers published in the past five years. This review comprehensively discusses the applications of LDH-derived materials as catalysts in different hydrogenation and hydrogenolysis reactions, showcasing their extraordinary potentials in these reactions and their future significance.
Article
Engineering, Chemical
Abdulrahman A. Al-Rabiah, Raed R. Alkathiri, Abdulaziz A. Bagabas
Summary: This study developed a new catalyst for the low-pressure one-step gas-phase selective hydrogenation of acetone to produce Methyl isobutyl ketone (MIBK). The economic analysis showed that the process is highly profitable, reducing the capital and operating costs of MIBK synthesis.
Review
Engineering, Environmental
Qianzhen Fang, Shujing Ye, Hailan Yang, Kaihua Yang, Junwu Zhou, Yue Gao, Qinyi Lin, Xiaofei Tan, Zhongzhu Yang
Summary: Layered double hydroxide-biochar (LDH-BC) composites have gained increasing attention as adsorbents and catalysts for contaminant removal due to their good chemical stability, abundant surface functional groups, excellent anion exchange ability, and good electronic properties. Strategies for enhancing the properties of LDH-BC composites, such as magnetic treatment, acid treatment, and LDHs intercalation, are highlighted in this review, with further studies and potential future applications being recommended.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Chemistry, Physical
Diana Gilea, Radu G. Ciocarlan, Elena M. Seftel, Pegie Cool, Gabriela Carja
Summary: Artificially designed heterostructures formed by close conjunctions of plasmonic metal nanoparticles and non-plasmonic lamellar nanostructures are of great interest. These heterostructures exhibit localized surface plasmon resonance in the specific environment of the light-absorbing matrix, impacting their potential in plasmon-enhanced catalysis. Layered double hydroxides, with their unique 2D-layered structure and advantages in optical absorption, preparation ease, composition diversity, and high surface area, have emerged as promising candidates for versatile and robust catalysts.
Article
Chemistry, Multidisciplinary
Is Fatimah, Amri Yahya, Rendy Muhamad Iqbal, Muchammad Tamyiz, Ruey-an Doong, Suresh Sagadevan, Won-Chun Oh
Summary: The study successfully enhanced the photocatalytic activity of Zn-Al layered double hydroxides through calcination, resulting in improved removal of methyl violet and natural organic materials in peat water.
Article
Chemistry, Multidisciplinary
Kazuyuki Iwase, Tomo Hirano, Itaru Honma
Summary: In this study, two-dimensional Cu-Al/LDHs were used as catalysts for CO2RR, with the elemental ratio of Cu and Al and sheet size being key factors. The most active catalyst showed high faradaic efficiency for CO and formate generation at a current density of 50 mA. The research indicates that the sheet size of LDH plays a critical role in determining the CO2RR activity.
Article
Chemistry, Multidisciplinary
W. L. Joyce Kwok, Hongri Suo, Chunping Chen, D. W. Justin Leung, Jean-Charles Buffet, Dermot O'Hare
Summary: This study demonstrates a novel atom economic synthesis method for a new type of dense porous layered double hydroxides using struvite, a common waste product from wastewater treatment plants. The resulting SLDHs have significantly higher specific surface areas and larger pore volumes compared to conventional coprecipitated LDHs while maintaining a comparable particle density.
Article
Chemistry, Inorganic & Nuclear
Salman Ahmad, Muhammad B. Wazir, Muhammad Daud, Chin Kui Cheng, Mansoor Ul Hassan Shah, Mamdouh A. Al-Harthi
Summary: LDHs are two-dimensional nanomaterials with layered structure, and their properties can be enhanced through modification. This article presents the methods and results of LDHs modification with various ILs, as well as the impact of modification on LDHs properties.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Environmental Sciences
Zhongshuo Xu, Yueheng Zhong, Yuhui Wang, Xinshan Song, Wei Huang
Summary: Phosphorus pollution can cause both aquatic eutrophication and global phosphorus scarcity. Fe-based layered double hydroxides (LDHs) have been extensively studied for their high phosphorus adsorption and recovery. The composition of Fe-based LDHs is crucial in determining their adsorption performance. In this study, Zn/Fe LDH exhibited a much higher adsorption capacity than Mg/Fe LDH, and calcination significantly increased the adsorption capacity of Mg/Fe LDH. The phosphorus removal efficiency of Fe-based LDHs was high under acidic conditions but decreased with increasing pH, with Zn/Fe LDH showing weaker pH inhibition.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Yusen Yang, Zhen Ren, Shijie Zhou, Min Wei
Summary: Heterogeneous upgrading reactions are a promising and pivotal strategy for efficient utilization of biomass resources to produce chemical energy, fuel, and hydrogen. Supported catalysts play a key role in determining catalytic activity and selectivity, with the efficiency relying on the properties of metals, supports, additives, reactors, and reaction conditions. Catalysts derived from layered double hydroxides (LDHs) precursors have shown outstanding catalytic performance and offer innovative strategies for high-efficiency LDHs-derived catalysts.
Article
Chemistry, Applied
Carolina Machado Terzi, Everton Henrique dos Santos, Charles Carvalho, Vanessa Prevot, Fernando Wypych, Claude Forano, Shirley Nakagaki
Summary: Catalytic oxidation of cyclohexane to cyclohexanol and cyclohexanone with H2O2 was performed using ZnAl or MgAl layered double hydroxides (LDHs) modified with tungstate and molybdate anions as catalysts in heterogeneous medium. The catalysts were prepared by direct anion exchange reactions of tungstate and molybdate on LDHs intercalated with chloride/ carbonate anions. ZnAl-modified with WO42- showed higher activity and selectivity for ketone than MgAl-modified WO42- or any molybdate-based LDH catalysts.
Article
Chemistry, Multidisciplinary
Peterson de Andrade, Juan C. Munoz-Garcia, Giulia Pergolizzi, Valeria Gabrielli, Sergey A. Nepogodiev, Dinu Iuga, Laszlo Fabian, Rinat Nigmatullin, Marcus A. Johns, Robert Harniman, Stephen J. Eichhorn, Jesus Angulo, Yaroslav Z. Khimyak, Robert A. Field
Summary: Understanding the self-assembly of building blocks into complex hierarchical structures is a major challenge in designing soft-matter materials. A series of fluorinated cellodextrins were prepared by chemoenzymatic synthesis and their structural characterization revealed unprecedented features, with multiply 6-fluorinated chains assembling into particles with unique morphological and crystallinity properties.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Agricultural Engineering
Nikolay V. Gromov, Tatiana B. Medvedeva, Yulia A. Rodikova, Maria N. Timofeeva, Valentina N. Panchenko, Oxana P. Taran, Ivan V. Kozhevnikov, Valentin N. Parmon
Summary: This study investigated the one-pot synthesis of sorbitol using Ru-containing composites based on H3PW12O40 supported on ZrO2 and Nb2O5 as catalysts. The results showed that Ru-PW/ZrO2 systems were more active than Ru-PW/Nb2O5, with the highest sorbitol yield observed under certain specific reaction conditions. The catalyst showed good stability for multiple reaction cycles without loss of activity.
BIORESOURCE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Augusto L. P. de Meireles, Kelly A. da Silva Rocha, Elena F. Kozhevnikova, Ivan V. Kozhevnikov, Elena V. Gusevskaya
Summary: The H3PW12O40 heteropoly acid supported on SiO2 as a catalyst and its bulk acidic cesium salt Cs2.5H0.5PW12O40 have been demonstrated to be highly active and recyclable for the Prins cyclization reaction, leading to the efficient synthesis of the valuable floral odorant Florol? from isoprenol and isovaleraldehyde. The use of dimethylcarbonate or diethylcarbonate as green reaction media, along with low catalyst loadings and moderate conditions, contribute to the sustainability of the method.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Multidisciplinary
Raquel Fernandez-Garcia, Juan C. Munoz-Garcia, Matthew Wallace, Laszlo Fabian, Elena Gonzalez-Burgos, M. Pilar Gomez-Serranillos, Rafaela Raposo, Francisco Bolas-Fernandez, M. Paloma Ballesteros, Anne Marie Healy, Yaroslav Z. Khimyak, Dolores R. Serrano
Summary: The antifungal drug amphotericin B interacts differently with fungal and mammalian cells, leading to efficacy against fungi and toxicity in mammalian cells. Understanding the self-assembly states of amphotericin B in aqueous media and the impact of excipients on its aggregation states can modulate the drug's diffusion across membranes, improve efficacy, and reduce toxicity. Tuning the aggregation state of amphotericin B formulations is a promising strategy to achieve a more selective response against fungal cells and minimize toxicity in mammalian cells.
JOURNAL OF CONTROLLED RELEASE
(2022)
Article
Medicine, Research & Experimental
Maciej Nowak, Aleksandra J. Dyba, Jan Janczak, Alexander Morritt, Laszlo Fabian, Bozena Karolewicz, Yaroslav Z. Khimyak, Doris E. Braun, Karol P. Nartowski
Summary: Control over polymorphism and solvatomorphism in API is crucial for the industrial development of new drugs. In this study, cooling and suspension crystallization were applied to access polymorphs and solvates of fluconazole, and the interrelations and transformation pathways were elucidated through structural analysis and solid-state NMR.
MOLECULAR PHARMACEUTICS
(2022)
Article
Nanoscience & Nanotechnology
Guofan Xu, Rinat Nigmatullin, Todor T. Koev, Yaroslav Z. Khimyak, Ian P. Bond, Stephen J. Eichhorn
Summary: Linseed oil-in-water Pickering emulsions stabilized by sulfated CNCs and octylamine-modified CNCs exhibit different stability and self-healing properties. Octylamine-modified CNCs provide stronger resistance to creaming and smaller oil droplets compared to unmodified CNCs. Moreover, a CNC network at the oil-water interface protects the oil droplets from coalescence and enables self-healing of scratches on the coatings.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemistry & Molecular Biology
Karolina Krajewska, Anna M. Golkowska, Maciej Nowak, Marta Kozakiewicz-Latala, Wojciech Pudlo, Andrzej Zak, Bozena Karolewicz, Yaroslav Z. Khimyak, Karol P. Nartowski
Summary: This study proposes the use of HR-MAS NMR spectroscopy for a molecular level characterisation of the external surface of carbohydrate-functionalised nanoparticles. The results demonstrate that HR-MAS NMR can provide detailed structural information on the organic functionalities attached at the external surface of MSN within short experimental times.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Applied
Todor T. Koev, Hannah C. Harris, Sara Kiamehr, Yaroslav Z. Khimyak, Frederick J. Warren
Summary: This study investigates the influence of starch hydrogel bulk structural and molecular level parameters on their properties as drug delivery platforms, as well as their interactions with gastrointestinal conditions and the large intestinal microbiota. It is found that the choice of starch can be modified to fine tune the corresponding hydrogel's pharmacokinetic profile.
CARBOHYDRATE POLYMERS
(2022)
Article
Chemistry, Multidisciplinary
Luisa Roca-Paixao, Natalia T. Correia, Florence Danede, Maria T. Viciosa, Alexander Lee Morritt, Yaroslav Z. Khimyak, Frederic Affouard
Summary: The nature of structural and dynamical disorder in a nanoporous organic cocrystal carbamazepine-tartaric acid is investigated using various experimental techniques and molecular simulations. Translational and rotational dynamical disorder in the tartaric acid molecules within the cocrystalline architecture is observed, but it is only partial due to strong hydrogen bonding with the carbamazepine molecules. The findings highlight the role of disordered channel-like cocrystals in studying dynamics in nanoconfinement environments.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Alexey Philippov, Nikolay Nesterov, Vera Pakharukova, Ivan Kozhevnikov, Oleg Martyanov
Summary: This study investigates the effect of Cu on the catalytic activity and selectivity of Ni-Cu catalysts in transfer hydrogenation, and finds that the addition of Cu leads to deactivation of the catalyst during the conversion of anisole.
Article
Materials Science, Multidisciplinary
Amaka J. Onyianta, Anita Etale, Todor T. Koev, Jean-Charles Eloi, Yaroslav Z. Khimyak, Stephen J. Eichhorn
Summary: In this unconventional approach, polypropylene microparticles were suspended and stabilized in aqueous suspensions of amphiphilic cellulose nanocrystals (CNCs) to enable adsorption of the nanoparticles onto the thermoplastic. This method increased the Young's moduli of the CNC-thermoplastic composites and could be extended to other thermoplastics.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Applied
Hannah C. Harris, Noelia Pereira, Todor Koev, Yaroslav Z. Khimyak, Gleb E. Yakubov, Frederick J. Warren
Summary: In vitro fermentation experiments using different fractions (F1, F2, and F3) of psyllium demonstrated that F1 produced significantly higher amounts of gas and short chain fatty acid compared to F2 and F3. Gas production was significantly lower for F3 compared to F2, but metabolite production did not differ between F2 and F3. Microscopy showed differences in the breakdown of fractions and the localization of bacteria on the outer edge. These results suggest that the structure of psyllium fractions is a key factor determining fermentability and flow properties may influence gas production.
FOOD HYDROCOLLOIDS
(2023)
Article
Chemistry, Applied
Jair C. C. Freitas, Maryam Ejaz, Aline T. Toci, Wanderson Romao, Yaroslav Z. Khimyak
Summary: The use of spectroscopic techniques, particularly solid-state nuclear magnetic resonance (NMR), to investigate coffee samples is highly valuable in addressing the widespread issues of coffee adulteration and counterfeiting. This study demonstrates that solid-state NMR spectroscopy can effectively differentiate various types of coffee, detect counterfeiting or adulteration in coffee blends, and examine the molecular mobilities and interactions in coffee samples. These findings highlight the importance of solid-state NMR spectroscopy in ensuring the quality control of coffee-related products.
Article
Chemistry, Physical
Katarzyna Malec, Serena Monaco, Ignacio Delso, Justyna Nestorowicz, Marta Kozakiewicz-Latala, Bozena Karolewicz, Yaroslav Z. Khimyak, Jesus Angulo, Karol P. Nartowski
Summary: In this study, the interaction between small guest molecules and surfactants forming micelles was investigated using NMR techniques and molecular dynamics simulations. The molecular organization of drugs within the hydrophilic and hydrophobic domains of micellar aggregates was revealed, and it was found that flexible surfactants do not follow the classical core-shell model of micelles. These findings have important implications for the analysis of host-guest systems in a broad range of colloidal systems, from soft materials to biological systems.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Pharmacology & Pharmacy
Maciej Nowak, Aleksandra J. Dyba, Anna M. Golkowska, Aleksandra Nieckarz, Karolina Krajewska, Katarzyna Malec, Dinu Iuga, Bozena Karolewicz, Yaroslav Z. Khimyak, Karol P. Nartowski
Summary: Encapsulation of the drug fluconazole into mesoporous silica carriers was studied using different techniques. The results showed that the crystallization process and local environments of the drug were influenced by the pore size and water content of the carriers.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Chemistry, Physical
Yifan Sun, Ye Lv, Wei Li, Jinli Zhang, Yan Fu
Summary: In this study, PtRu electrocatalysts were fabricated on carbon paper via cyclic electrodeposition for the electrocatalytic hydrogenation (ECH) of phenol. The Pt3Ru3 catalyst exhibited excellent activity and stability for the conversion of phenol to cyclohexanol at ambient temperature and various current densities. The in situ Raman spectroscopy and kinetic study revealed the hydrogenation mechanism of phenol over Pt3Ru3 in acidic electrolyte, providing an effective electrochemical strategy for the facile construction of durable electrode materials and efficient phenol hydrogenation.
JOURNAL OF CATALYSIS
(2024)
Article
Chemistry, Physical
Amir Shahzad, Khezina Rafiq, Muhammad Zeeshan Abid, Naseem Ahmad Khan, Syed Shoaib Ahmad Shah, Raed H. Althomali, Abdul Rauf, Ejaz Hussain
Summary: Photocatalytic hydrogen production through water splitting is an effective method for meeting future energy demands. In this study, researchers synthesized a 1 % Ag2S/Cu2S co-doped CdZnS catalyst and found that it can produce hydrogen at a higher rate. The co-doping of Ag2S and Cu2S in the CdZnS catalyst showed a synergistic effect, with Ag2S promoting oxidation reactions and Cu2S promoting reduction reactions.
JOURNAL OF CATALYSIS
(2024)
