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
Chemistry, Physical
Chao Sun, Katarzyna Swirk Da Costa, Dominik Wierzbicki, Monika Motak, Teresa Grzybek, Patrick Da Costa
Summary: Ni-containing mixed oxides derived from layered double hydroxides with various amounts of yttrium exhibited excellent catalytic activity, especially in the moderate temperature region. Modification with different amounts of yttrium had a positive effect on the catalytic performance and CO2 conversion rate, leading to mixed oxides with stronger affinity and smaller crystallite size.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Zahra Taherian, Vahid Shahed Gharahshiran, Alireza Khataee, Yasin Orooji
Summary: The study utilized freeze-dried promoted-Ni/MgAl catalysts to address catalyst deactivation by coking in methane dry reforming. By enhancing the basicity of the catalyst, the promotion led to higher activity and stability of the catalyst in conversion of methane, with the Sr-promoted Ni/MgAl catalyst demonstrating the best performance.
Article
Chemistry, Physical
Alvin Ming Hao Lim, Jun Wen Yeo, Hua Chun Zeng
Summary: A synthesis method was developed to introduce transition metal ions into MgAl-LDH using the memory effect property of calcined LDH. The resulting CuZn-doped MgAl-LDH catalyst showed high specific activity and methanol selectivity in CO2 hydrogenation. The excellent performance was attributed to the easily accessible active sites on the surface of nanostructured petals.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Tim Van Everbroeck, Jianxiong Wu, Daniel Arenas-Esteban, Radu-George Ciocarlan, Myrjam Mertens, Sara Bals, Christophe Dujardin, Pascal Granger, Elena M. Seftel, Pegie Cool
Summary: This research presents a novel approach for developing noble metal-free three-way catalysts using ZnAl layered double hydroxide (LDH) co-precipitated with Mn and Ti. The addition of Cu during the co-precipitation step and a post-synthesis method using the LDH memory effect were explored. The results showed that smaller CuO particle size resulted in better performance for oxidation reactions. The addition of Mn had a positive effect on the general performance of the catalysts, while the presence of Ti mainly improved the NO conversion. The developed materials showed good stability in consecutive catalytic testing cycles and even showed some NO conversion under stoichiometric conditions.
APPLIED CLAY SCIENCE
(2022)
Review
Chemistry, Applied
Kailin Wang, Tianqi Wang, Quazi Arif Islam, Yan Wu
Summary: Semiconductor photocatalysis for splitting water or reducing CO2 to produce H-2 or hydrocarbon fuels is a promising approach. Layered double hydroxides (LDHs) have unique structures but face limitations in application, leading scholars to explore ways to enhance their energy conversion efficiency.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Fenglin Wang, Zuxin Wen, Zhicheng Zheng, Wenqiang Fang, Long Chen, Fashen Chen, Ning Zhang, Xiaohe Liu, Renzhi Ma, Gen Chen
Summary: A novel electrolyte additive of MgAl layered double hydroxides (LDHs) is proposed to improve the solubility of LiNO3 and enhance the performance of Li metal anodes. MgAl LDHs promote the coordination of NO3- ions and absorb anions, leading to more dissociated Li+ ions and improved Li+ migration in carbonate electrolytes. The cells assembled with MgAl LDHs and LiNO3 additives demonstrate high Coulombic efficiency, excellent rate capability, and high capacity retention. This study provides new insights into LiNO3 promoter design and explores the potential of LDHs materials for Li metal batteries.
ADVANCED ENERGY MATERIALS
(2023)
Article
Polymer Science
Ana P. Arcanjo, Denisson O. Liborio, Santiago Arias, Florival R. Carvalho, Josivan P. Silva, Bernardo D. Ribeiro, Marcos L. Dias, Aline M. Castro, Roger Frety, Celmy M. B. M. Barbosa, Jose Geraldo A. Pacheco
Summary: In this study, the chemical recycling of PET residues was carried out using Mg-Fe and Mg-Al oxide catalysts derived from layered double hydroxides, with glycolysis using ethylene glycol as the catalyst. The catalysts prepared using the low supersaturation method showed higher PET conversion compared to the high supersaturation method. The Mg-Fe catalysts exhibited higher PET conversion than the Mg-Al catalysts, and could be reused multiple times with high conversion rates.
Review
Environmental Sciences
Sonika Kumari, Varruchi Sharma, Savita Soni, Ajay Sharma, Abhinay Thakur, Satish Kumar, Kuldeep Dhama, Anil Kumar Sharma, Shashi Kant Bhatia
Summary: Layered double hydroxides (LDHs) are a class of materials with unique structures and properties that have a wide range of applications. LDHs can be synthesized in a cost-effective and environmentally friendly manner through aqueous synthetic pathways, and they have the advantages of easy modification and controlled release. LDHs have great potential in drug delivery, as they can stabilize drugs, enhance solubility, and control release. Additionally, LDHs have good biocompatibility and cellular uptake. This study demonstrates the applications of LDHs and their hybrids/composites in drug, cosmeceutical, and gene delivery systems.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Chemical
A. I. Boulahbal, L. Santamaria, A. Azizi, M. Boutahala, S. A. Korili, A. Gil
Summary: This study reports for the first time the use of saline slag, a hazardous waste generated during aluminum recycling, as an aluminum source for the synthesis of CuAl layered double hydroxides (LDH). The synthesis pH was found to have a significant effect on the nature of secondary phases, as well as the structure and morphology of the samples.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Physical
Mingtao Zhang, Feng Wang, Yifei Long, Linwen Yu, Changhui Yang, Mengyuan Wen, Xiaolan Yu, Yi Tian, Min Zhao
Summary: This study used calcined Mg/Al layered double hydroxide (CLDH) to improve the carbonation resistance of alkali-activated slag (AAS) mortars. The results showed that CLDH reconstructed the structure of AAS mortars, formed a buffer system to absorb CO2, and increased the density of the mortars.
APPLIED CLAY SCIENCE
(2022)
Article
Chemistry, Physical
Elisa Boccalon, Gianluca Viscusi, Andrea Sorrentino, Fabio Marmottini, Morena Nocchetti, Giuliana Gorrasi
Summary: solvent-free synthesis was employed to prepare HNT@LDH composite materials, with the optimal composite containing 20% LDH determined through experimentation. Salicylate was incorporated into the composite through intercalation into the layered double hydroxide, where different intercalation methods affected the release of salicylate.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Zaliya A. Fedorova, Vadim A. Borisov, Vera P. Pakharukova, Evgeniy Y. Gerasimov, Vladimir D. Belyaev, Tatyana I. Gulyaeva, Dmitriy A. Shlyapin, Pavel V. Snytnikov
Summary: Layered Ni-Mg-Al hydroxides with different Mg/Ni ratios and related oxide systems were synthesized and characterized. After heat treatment, Ni-Mg-Al-mixed oxides with a specific nanostructure were formed. LDH-derived Ni-Mg-Al catalysts showed superior catalytic performance in ammonia decomposition compared to existing analogues.
Article
Chemistry, Applied
Olga Gorlova, Iva Paterova, Katerina Karlikova, Martin Vesely, Libor Cerveny
Summary: Baeyer-Villiger oxidation was studied using tin-containing heterogeneous catalysts based on mixed oxides. The catalysts demonstrated high activity and selectivity in the model reaction, achieving total conversion and almost 100% selectivity to the desired product.
Article
Chemistry, Physical
Yuanyuan Jiang, Haolan Liu, Huaiyuan Zhao, Ruru Zhou, Weichen Du, Songlin Wang, Zhaoyin Hou
Summary: This study achieved the catalytic synthesis of stable and efficient 3-hydroxybutyraldehyde from surplus acetaldehyde by preparing solid base catalysts with specific structures. Under specific conditions, the selectivity of 3-HBA reached 89.0%, with a conversion rate of 73.8% for acetaldehyde, and the catalyst could maintain its activity for up to 300 hours.
APPLIED CLAY SCIENCE
(2021)
Article
Chemistry, Physical
Rodica Zavoianu, Anca Cruceanu, Octavian Dumitru Pavel, Corina Bradu, Mihaela Florea, Ruxandra Birjega
Summary: This study investigates the effect of the chemical composition of LDH materials on their catalytic activity for olefin epoxidation, and the results show that the basicity of the samples is correlated with their catalytic activity.
Article
Chemistry, Physical
Rodica Zavoianu, Silvana-Denisa Mihaila, Bogdan Cojocaru, Madalina Tudorache, Vasile Parvulescu, Octavian Dumitru Pavel, Solon Oikonomopoulos, Elisabeth Egholm Jacobsen
Summary: Using TMAH is a viable option for the synthesis of MgZnAl-LDH-type materials. It offers advantages such as smaller water quantity required, prevention of LDH contamination, and acting as a template molecule. However, it also has disadvantages such as its presence in small quantities. The basicity of catalysts and the planar rigidity of the compound affect the catalytic activities.
Editorial Material
Chemistry, Physical
Ioan-Cezar Marcu, Octavian Dumitru Pavel
Article
Chemistry, Multidisciplinary
Andrei Cristian Kuncser, Arpad Mihai Rostas, Rodica Zavoianu, Octavian Dumitru Pavel, Ioana Dorina Vlaicu, Mihaela Badea, Daniela Cristina Culita, Alina Tirsoaga, Rodica Olar
Summary: Hematite-based nanomaterials have a wide range of applications in catalytic organic and inorganic reactions, including water purification from organic pollutants. Bimetallic hematite-based nanocomposites were prepared by controlled calcination of goethite composites, and their composition includes combinations of alpha-FeOOH, alpha-Fe2O3 or gamma-Fe2O3 with amorphous (Mn2O3, Co3O4, NiO, ZnO) or crystalline (CuO) oxides of the second transition ion. The composition, size, and shape of the nanocomposites were confirmed by various characterization techniques. The specific surface area and pore volume of the nanocomposites were found to be lower compared to corresponding goethites. Among them, a copper-containing hematite-based nanocomposite exhibited excellent catalytic activity in the presence of hydrogen peroxide, achieving over 99% removal of indigo carmine, and maintained a removal extent of over 90% even after four cycles.
Article
Engineering, Chemical
Gheorghita Mitran, Luiza Izabela Jinga, Gianina Florentina Popescu-Pelin, Octavian Dumitru Pavel
Summary: The presence of tetrahedral sites leads to high selectivity towards pyruvic acid, while the presence of octahedral sites facilitates the further conversion of pyruvic acid into acetic acid with a high reaction rate.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Biochemistry & Molecular Biology
Rodica Zavoianu, Madalina Tudorache, Vasile I. Parvulescu, Bogdan Cojocaru, Octavian D. Pavel
Summary: A rapid, cheap and feasible new approach using tetramethylammonium hydroxide (TMAH) as a nontraditional hydrolysis agent was successfully applied to synthesize Mg0.375Fe0.375Al0.25-LDH through mechano-chemical and co-precipitation methods. This method has advantages in terms of fewer steps, lower energy involvement, and elimination of alkaline cation contamination. The basicity of the catalysts was found to have a linear dependence on their catalytic activity in Claisen-Schmidt condensation, and the presence of these catalysts inhibited the oxidation of benzaldehyde.
Article
Chemistry, Physical
Alexandra-Elisabeta Stamate, Octavian Dumitru Pavel, Rodica Zavoianu, Ruxandra Birjega, Katja Neubauer, Angela Koeckritz, Ioan-Cezar Marcu
Summary: The study focused on the structural and bifunctional catalytic properties of MgNi(Cu)Al layered double hydroxides (LDH) with varying molar ratios of cations. The LDH materials were characterized using various techniques and were tested in a cascade oxidation-Knoevenagel condensation reaction. The results showed that the Ni/Cu molar ratio and the nature of the solvent significantly influenced the reaction performance.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Octavian Dumitru Pavel, Alexandra-Elisabeta Stamate, Rodica Zavoianu, Anca Cruceanu, Alina Tirsoaga, Ruxandra Birjega, Ioana Andreea Brezestean, Alexandra Ciorita, Daniela Cristina Culita, Ana Paula Soares Dias
Summary: This paper focuses on the use of hybrid catalysts (Mo-LDH-GO composites) for the removal of indigo carmine dye (IC) from wastewater using environmentally friendly H2O2 as the oxidation agent. The catalysts were characterized and the most efficient catalyst was found to be the one with 20%wt. GO, achieving a removal rate of 96.6% for IC. The results suggest a strong correlation between catalytic activity, textural properties, and basicity of the catalysts.
Article
Green & Sustainable Science & Technology
Andrei Iulian Slabu, Ionut Banu, Octavian Dumitru Pavel, Florina Teodorescu, Raluca Stan
Summary: In this study, renewable products were synthesized by functionalizing linseed oil through epoxidation and epoxy ring-opening with carboxylic acids and anhydrides. LDHs (Layered Double Hydroxides) were used as catalysts, offering the advantages of easy separation and reusability. Different carboxylic acids and anhydrides were employed, leading to sustainable products that can replace petrochemical compounds. Under optimized reaction conditions, a nearly complete conversion of epoxy groups was achieved for all ring-opening reagents at 170 degrees Celsius.
Article
Pharmacology & Pharmacy
Ana-Lorena Neagu, Anamaria Zaharia, Octavian Dumitru Pavel, Alina Tirsoaga, Iulia Elena Neblea, Sorin Viorel Dolana, Carmen Elena Tebrencu, Tanta-Verona Iordache, Andrei Sarbu, Rodica Zavoianu
Summary: This work focuses on the synergetic effect of immobilizing Rhamnus frangula L. (RfL) phytoextract in layered double hydroxides (LDHs) and encapsulating them into biocompatible hydrogels (HG). After immobilization of the phytoextract in LDHs, they were embedded into HG matrixes based on polyethylene glycol diacrylate (PEGDA). The results showed improved release behavior of the phytoextract from the composite HGs, indicating the synergistic effect of PEGDA network and LDH particles.
Article
Chemistry, Physical
Gheorghita Mitran, Stefan Neatu, Octavian Dumitru Pavel, Adriana Urda, Anca G. G. Mirea, Mihaela Florea, Florentina Neatu
Summary: Iron-doped Co3O4 oxides prepared by a surfactant-assisted method showed good catalytic activity in malic acid conversion, with oxygen defects and the presence of Co2+ playing a key role in catalyst activation for pyruvic acid production. The most active catalyst, with a conversion rate of 70% for malic acid and a yield of 24% for pyruvic acid, had an inverse spinel structure and a low band-gap. The catalyst with the highest Co2+ loading exhibited the highest yield of pyruvic acid.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
