Article
Chemistry, Applied
Arti Malik, Udai P. Singh
Summary: We report the synthesis, characterization, and catalytic activity of a highly efficient and reusable silica-based catalyst MCM-41@CP@PAL@Cu. The catalyst was prepared by anchoring a Cu(II)-Schiff base complex onto mesoporous MCM-41 with a surface-grafted -chloro group. Various analytical methods, including FT-IR, Low angle P-XRD, TGA, N-2 adsorption-desorption, SEM, TEM, and MPAES, were used to characterize the obtained catalyst. The composition and chemical state of Cu metal in the catalyst were identified using X-ray photoelectron spectroscopy. The catalyst MCM-41@CP@PAL@Cu was employed for the conversion of various alkenes to their epoxides with a yield of 99% in the model reaction. The catalyst can be reused for at least six times.
JOURNAL OF POROUS MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Babak Karimi, Nasim Ganji, Omid Pourshiani, Werner R. Thiel
Summary: This article provides a comprehensive review of the recent advances in the synthesis, morphology, functionalities, and applications of periodic mesoporous organosilicas (PMOs), with a focus on developments after 2014. Special attention is given to a new family of PMOs, namely hollow spherical and hollow/yolk shell PMOs, which offer additional benefits compared to traditional PMOs.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Chemistry, Applied
Marta Bordonhos, Mirtha Lourenco, Jose R. B. Gomes, Paula Ferreira, Moises L. Pinto
Summary: The study investigates the application of periodic mesoporous organosilica materials in ethylene and ethane adsorption for the first time. Results show that the materials tend to be more selective towards ethylene, with silylated materials exhibiting higher affinity towards ethane. Additionally, samples functionalized with primary amines show better selectivity towards ethylene.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Saurabh Sharma, Udai P. P. Singh
Summary: A new hybrid catalyst has been synthesized by immobilizing copper(II) alpha-diimine complex on mesoporous silica. The catalyst shows high reactivity and stability in converting alkenes into epoxides, with trans stilbene achieving a maximum yield of 100%. It can be recycled and reused multiple times without significant loss of activity.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Applied
Qian Gu, PingPing Jiang, Yirui Shen, Kai Zhang, Phyu Thin Wai, Agus Haryono
Summary: Highly dispersed molybdenum trioxide was loaded into three-dimensional dendritic mesoporous silica nanospheres (MoO3@3D-DMSNs) via a one-pot method. These MoO3@3D-DMSNs showed better catalytic performance for olefin epoxidation, with optimal conditions at a Mo/Si molar ratio of 5%. The catalysts maintained their activity and stability after five reaction-regeneration cycles, demonstrating good potential for catalytic reactions.
JOURNAL OF POROUS MATERIALS
(2021)
Article
Energy & Fuels
Mengshuai Liu, Penghui Zhao, Wenwen Zhang, Xin Cheng, Hongtao Fei, Jingjing Ma, Fusheng Liu
Summary: This study developed triazine- and urea-functionalized periodic mesoporous organosilicas (TUF-PMOs) for CO2 adsorption and conversion. The optimized TUF-PMO-20 with TBAI cocatalyst demonstrated good bifunctionality, reusability, and versatility.
Article
Chemistry, Inorganic & Nuclear
M. Angeles Navarro, Juan Amaro-Gahete, Jose R. Ruiz, Cesar Jimenez-Sanchidrian, Francisco J. Romero-Salguero, Dolores Esquivel
Summary: A new heterogeneous catalyst with excellent catalytic performance has been synthesized by immobilizing a copper complex on a surface-functionalized ordered mesoporous organosilica. The catalyst showed high conversion and selectivity in the epoxidation reaction.
DALTON TRANSACTIONS
(2022)
Article
Multidisciplinary Sciences
Houbing Zou, Jinyu Dai, Jinquan Suo, Rammile Ettelaie, Yuan Li, Nan Xue, Runwei Wang, Hengquan Yang
Summary: The study presents a multicompartmentalized mesoporous organosilica material for spatial co-localization of metal nanoparticles, resulting in a significant enhancement in activity for sequential hydrogenation reactions. The revealed mechanism of neighboring metal-assisted hydrogenation via hydrogen spillover contributes to the enhanced catalytic efficiency in the designed cascade catalyst.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Environmental
Bruna Castanheira, Sergio Brochsztain, Larissa Otubo, Antonio Carlos S. C. Teixeira
Summary: In this study, PMONDI was used as a photocatalyst for the efficient degradation of antibiotics. Compared to traditional TiO2/SBA-15, PMONDI showed improved performance in terms of photodegradation and reusability. Analysis of the degradation products revealed two main pathways. Therefore, PMONDI materials have great potential as photocatalysts for the degradation of CECs and should be further explored.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Chemistry, Analytical
Bei Liu, Hui Li, Kaijun Quan, Jia Chen, Hongdeng Qiu
Summary: This review article focuses on the application of periodic mesoporous organosilica (PMO) materials with organic functionalities in chromatographic separation, including packed columns and monolithic columns. The correlation between PMO chromatographic stationary phase compositions and chromatographic performance is discussed by summarizing the functional bridges, synthesis methods, and modification methods. The research directions for further development of a more highly efficient PMO chromatographic column are also outlined.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Yangyu Liu, Chunquan Li, Arman Peyravi, Zhiming Sun, Guangxin Zhang, Keivan Rahmani, Shuilin Zheng, Zaher Hashisho
Summary: Mesoporous silica MCM-41 was synthesized using sodium silicate extracted from natural Opoka, showing remarkable adsorption capacity for organic vapors mixture at 20 degrees Celsius and promising applications in VOCs abatement.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Chemical
Hao Li, Danqing Shen, Huiling Lu, Fan Wu, Xueping Chen, Roser Pleixats, Jianming Pan
Summary: The article discusses the significance of Periodic Mesoporous Organosilica materials and their advantages in various fields, emphasizing their potential in detecting and recovering heavy metal ions effectively. It also stresses the urgent need to address the harm caused by heavy metal pollution to the environment and human health.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Wanlu Liu, Anna M. Kaczmarek, Karel Folens, Gijs Du Laing, Pascal Van der Voort, Rik Van Deun
Summary: Three Periodic Mesoporous Organosilica (PMO) materials were presented, including a pyridine dicarboxamide functionalized PMO (DPA-PMO) and two amine functionalized PMOs (Am-PMO and Am-ePMO). These materials show potential for near-infrared (NIR) luminescence applications.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Applied
Ang Li, Xiao Chen, Tingting Guo, Guangtong Hai, Panpan Liu, Han Yu, Jianhang Xu
Summary: This study utilized molecular dynamics to investigate the molecular motion mechanisms of PCMs with different functional groups confined in mesoporous MCM-41, aiming to reveal the interaction mechanisms between the two at the molecular and atomic levels to provide theoretical guidance for the design and preparation of high-performance composite PCMs based on MCM-41.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Natalia Szczepanik, Andrzej Kowalczyk, Zofia Piwowarska, Lucjan Chmielarz
Summary: In this study, MCM-41-type mesoporous silicas were modified with alumina using different methods, and the properties of the obtained materials were characterized and tested for catalytic performance. The results showed that the performance of the catalysts depended on the contribution and aggregation of surface-exposed aluminum species. The most active catalyst could be effectively regenerated under certain conditions.
Article
Chemistry, Analytical
Diogo B. Goncalves, Carla S. P. Santos, Teresa Pinho, Rafael Queiros, Pedro D. Vaz, Mark Bloore, Paolo Satta, Zoltan Kovacs, Susana Casal, Isabel Hoffmann
Summary: Fish fraud is a challenging issue in the industry that can be addressed using accurate and cost-effective tools like near infrared reflectance spectroscopy. This study successfully predicted the nutritional values of fish and discriminated between different sources and conditions, demonstrating the potential of NIRS as a suitable strategy for addressing fish fraud and quality control.
JOURNAL OF AOAC INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Sonia R. Leandro, Ines J. Marques, Ruben S. Torres, Tiago A. Fernandes, Pedro D. Vaz, Carla D. Nunes
Summary: A 2:1 Co/Al layered double hydroxide material was synthesized with Au nanoparticles immobilized for catalytic performance in the reduction of nitroaromatic compounds and rhodamine dyes. While the Au-containing catalyst showed the best activity, the LDH with Cl- closely followed in performance and exhibited higher stability in the presence of amine products. These results suggest the potential of first-row metal-based catalysts in addressing environmental concerns and achieving efficient processes.
INORGANICA CHIMICA ACTA
(2021)
Article
Chemistry, Physical
Cristina I. Fernandes, Pedro D. Vaz, Carla D. Nunes
Summary: Iron oxide magnetic nanoparticles of different sizes were successfully synthesized and functionalized with an organic phosphine ligand coordinated to a Mo-based organometallic core. The resulting nano-hybrid materials exhibited excellent catalytic performance in olefin epoxidation reactions, showing high activity, selectivity, and recyclability.
Article
Chemistry, Physical
Mariela M. Nolasco, Paulo J. A. Ribeiro-Claro, Pedro D. Vaz
Summary: The structure and dynamics of crystalline 4-(dimethylamino) benzaldehyde (4DMAB) were studied using INS spectroscopy combined with periodic DFT calculations. The experimental and calculated spectra showed excellent agreement, allowing for reliable assignment of INS bands. The simulated spectrum accurately described the external phonon modes and low-frequency molecular vibrations. Crystal field splitting was observed for modes assigned to the dimethylamino group. The torsional motion of methyl groups was analyzed, and specific methyl groups were identified based on four individual bands. The torsional frequencies of these methyl groups fell within a range similar to that observed for methyl groups bonded to unsaturated carbon atoms. The hybridization state of the X atom in X-CH3 seemed to be crucial in determining the methyl torsional frequency.
Article
Physics, Multidisciplinary
Mariela M. Nolasco, Sonia N. Pedro, Carla Vilela, Pedro D. Vaz, Paulo Ribeiro-Claro, Svemir Rudic, Stewart F. Parker, Carmen S. R. Freire, Mara G. Freire, Armando J. D. Silvestre
Summary: This work investigates the effect of water on the physicochemical properties of deep eutectic solvents using inelastic neutron scattering spectroscopy. The results show that quenching samples in liquid nitrogen can retain the liquid phase morphology of DES at low temperatures. The preference of water molecules to bind to chloride anion is observed in the three studied systems, but they also present distinct features related to their unique properties and structure at the molecular level.
FRONTIERS IN PHYSICS
(2022)
Article
Chemistry, Physical
Rita N. Sales, Carla D. Nunes
Summary: Desulfurization is crucial for eliminating sulfur compounds from fuel feedstocks, and MoO3 nanoparticles synthesized through hydrothermal method have shown to be efficient catalysts for oxidative desulfurization. The catalyst demonstrated enhanced activity and selectivity in the desulfurization process, with temperature and solvent influencing the conversion rate. The catalytic performance of MoO3 nanomaterial was comparable or superior to other catalysts reported in literature.
Article
Biochemistry & Molecular Biology
Mariela M. Nolasco, Mariana Matos Coimbra, Stewart F. Parker, Pedro D. Vaz, Paulo J. A. Ribeiro-Claro
Summary: By comparing experimental and simulated spectra, the structural dynamics of chloromethanes were accurately evaluated, allowing for confident assignment of vibrational features including fundamental modes, lattice and combination modes. The overall excellent agreement between experimental and calculated spectra, particularly in describing the overtone sequence for CHCl3, was achieved.
Article
Chemistry, Multidisciplinary
Mariela M. Nolasco, Leonor C. Rodrigues, Catarina F. Araujo, Mariana M. Coimbra, Paulo Ribeiro-Claro, Pedro D. Vaz, Svemir Rudic, Armando J. D. Silvestre, Chaima Bouyahya, Mustapha Majdoub, Andreia F. Sousa
Summary: This work investigates the conformational preferences and structure-property correlations of poly(butylene 2,5-furandicarboxylate) (PBF), shedding light on the dominant structural motifs in the amorphous and crystalline regions. The study utilizes computational spectroscopic techniques and density functional theory calculations to identify the most favorable conformations and proposes a new crystal structure that better describes the polymer's macroscopic properties.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Mariana M. Coimbra, Ines Martins, Sofia M. Bruno, Pedro D. Vaz, Paulo J. A. Ribeiro-Claro, Svemir Rudic, Mariela M. Nolasco
Summary: The unique properties of Egyptian blue, a cuprorivaite pigment, were studied using computational and experimental methods. A reliable model of the crystal was obtained, allowing for the evaluation of its lattice dynamics and properties. Inelastic neutron scattering and infrared spectroscopies provided information on the chemical surfaces of the pigment, confirming the simulation results.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Bernardo Raimundo, Daisuke Kino, Nijika Kitgawa, Yasuaki Tokudome, Carla D. Nunes
Summary: In this study, low-cost CoAl LDH materials were demonstrated to be highly effective catalysts for the hydrogenation of aromatic nitro compounds to amino compounds under mild conditions, thanks to their high activity and unique physical and chemical properties. The as-synthesized CoAl LDH catalysts exhibited high conversion rates and selectivity for 7 different aromatic nitro compounds with competing functional groups, using sodium borohydride at room temperature and 1 atm. The reaction was completed in a short time, ranging from 5 to 150 min, and the catalyst showed excellent stability with over 8 cycles of reuse without significant loss of activity.
APPLIED CLAY SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ines J. Marques, Pedro D. Vaz, Ana V. Girao, Mariela M. Nolasco, Carla D. Nunes
Summary: Silica-coated iron oxide and silica nanoparticles were prepared and derivatized with a europium complex to yield magneto-fluorescent and fluorescent nanomaterials. The fluorescence was enhanced by the anchored europium complex and maintained in cellular medium. These nanomaterials have potential applications as biosensors and in imaging.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Mario R. Felicio, Pedro D. Vaz, Carla D. Nunes, Mariela M. Nolasco
Summary: In this study, novel Eu and Tb lanthanide complexes and their binuclear counterparts with Cu as the secondary metal were prepared and investigated for their potential applications as probes and cancer inhibitors. The results showed that the bimetallic complexes were more effective in promoting cancer cell death and sequestering Cu from the tumoral environment. Structural characterization and spectroscopic analysis were performed to reveal the properties of these complexes. Experimental data confirmed that the mononuclear complexes exhibited fluorescence and could sequester Cu ions. Cell viability tests demonstrated that these complexes induced cell death in breast and lung adenocarcinoma cancer cell lines. Overall, these complexes have significant potential as bioprobes and anticancer agents.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Rita N. Sales, Samantha K. Callear, Pedro D. Vaz, Carla D. Nunes
Summary: The study found that polar and apolar aprotic solvents can modulate olefin oxidation reactions in different ways. Acetonitrile significantly hindered reaction rates, while toluene did not. Neutron diffraction experiments confirmed the kinetic data and proposed a model based on substrate-solvent crosstalk through hydrogen bonding.
CHEMISTRY-SWITZERLAND
(2021)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)