Article
Engineering, Environmental
Marcus Vinicius do Prado, Beatriz Gonzalez, Miguel A. Vicente, Raquel Trujillano, Eduardo Jose Nassar, Antonio Gil, L. Santamaria, Sophia A. Korili, Liziane Marcal, Emerson H. de Faria, Katia J. Ciuffi
Summary: A versatile catalyst was prepared by immobilizing FeTFPP on amino-functionalized diatomaceous earth (DE-APTES) via grafting. The catalyst showed high efficiency in cyclooctene epoxidation and cyclohexane oxidation reactions, and demonstrated CO2 adsorption capacity.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Andrea Pappalardo, Francesco P. Ballistreri, Rosa Maria Toscano, Maria Assunta Chiacchio, Laura Legnani, Giovanni Grazioso, Lucia Veltri, Giuseppe Trusso Sfrazzetto
Summary: Three new chiral Mn macrocycle catalysts were synthesized and tested in the enantioselective epoxidation reactions. The effect of a BINOL compound in the catalyst backbone was evaluated using Density Functional Theory (DFT) calculations.
Article
Chemistry, Physical
Hui Sun, Huijian Shang, Bin Cui
Summary: Asymmetric catalysis using a chiral (Salen)Mn(III) complex has been successfully applied to highly enantioselective intramolecular haloamination reactions of alkenes. Experimental results suggest that the polarization of the C5-C6 bond has a significant effect on the regioselectivity of the products.
Article
Chemistry, Physical
Robabeh Hajian, Elnaz Bahrami
Summary: In this study, manganese porphyrin catalyst was successfully anchored onto magnetite-modified graphene oxide nanosheets and used for efficient epoxidation of alkenes, showing high selectivity and remarkable turnover frequency.
Article
Crystallography
Tomas Silha, Radovan Herchel, Ivan Nemec
Summary: A series of five novel Mn-salen-based compounds (1a-1c, 2a, 2b) were synthesized through the reaction between precursor chloride complexes and potassium silver/gold dicyanide. The compounds were structurally and magnetically characterized. The findings revealed that the Mn(III) central atoms exhibited axial magnetic anisotropy, and weak magnetic exchange was observed in compounds with a special supramolecular topology involving O-H···O hydrogen-bonded dimers.
Article
Chemistry, Applied
Zhenping Su, Jun Li, Xiaolong Bai, Jiaojiao Wei, Yujing Xu, Zeyu Zhang, Ning Wang
Summary: Four metalloporphyrin-based metal organic gels (MOGs) and porous coordination polymers (PCPs) were synthesized via solvothermal method, showing good catalytic activities for the cycloaddition reactions of epoxide and CO2 under mild and solvent-free conditions using tetrabutylammonium bromide (TBAB) as co-catalyst.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Wei Long, Andrei Sevbitov, Saade Abdalkareem Jasim, Olga Kravchenko, Moaed E. Al-Gazally, Supat Chupradit, Hamzah H. Kzar, Milad Kazemnejadi
Summary: This study introduces a new method of surface modification of polysaccharide filter papers, which significantly alters their catalytic properties. The modified filter paper shows high stability and reusability, allowing for the oxidation of alcohols and the direct conversion to Schiff bases and oximes.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Wei Long, Andrei Sevbitov, Saade Abdalkareem Jasim, Olga Kravchenko, Moaed E. Al-Gazally, Supat Chupradit, Hamzah H. Kzar, Milad Kazemnejadi
Summary: This study introduces a new approach to preparing a catalytic filtration or portable catalytic system based on modified polysaccharide filter paper, demonstrating its ability to oxidize alcohols and convert them directly into Schiff bases and oximes. The modified filter paper shows stability and reusability, with a deep investigation into the mechanism and stability of alcohol oxidation.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Pooja Chaudhary, Geeta Devi Yadav, Krishna K. Damodaran, Surendra Singh
Summary: New chiral Mn(III)-salen complexes were synthesized and evaluated for the asymmetric epoxidation of styrene, showing high yields and promising catalytic activity; the recovered catalysts could be reused for multiple runs, demonstrating good stability and durability.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Polymer Science
Zhenjie Yang, Chenyang Hu, Zan Gao, Ranlong Duan, Zhiqiang Sun, Yanchuan Zhou, Xuan Pang, Xuesi Chen
Summary: Switchable polymerization catalysis is achieved through reversible carboxylation of a commercial salen-manganese (Mn) complex, enabling the precise synthesis of multiblock copolymers.
Article
Chemistry, Inorganic & Nuclear
Marcello B. Solomon, Carol Hua, Bun Chan, Tamara L. Church, Seth M. Cohen, Clifford P. Kubiak, Katrina A. Jolliffe, Deanna M. D'Alessandro
Summary: The new metal-organic framework containing a Mn(ii) salen complex undergoes a reversible crystalline-to-amorphous transformation, and is stable to a one-electron reduction at more anodic potentials than the corresponding discrete complex, as supported by experimental studies and computational calculations.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Dong Han, Yuanfeng Li, Ya-Ping Han, Hong-Yu Zhang, Yuecheng Zhang, Jiquan Zhao
Summary: In this study, four different sidearm-containing Salen-Mn(III) complexes were synthesized and compared. It was found that the complex with a D-Boc-N-proline sidearm exhibited the best catalytic activity in the asymmetric epoxidation reaction. The steric hindrance and appropriate configuration of this sidearm facilitated the approach of olefins to the active center, resulting in improved reaction yields and enantioselectivities.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Inorganic & Nuclear
Pegah Asadollahi, Rahman Bikas, Marta S. Krawczyk, Tadeusz Lis
Summary: A new methoxo bridged dinuclear Mn(III) coordination compound was synthesized and studied for its catalytic activity in the oxidation of styrene. The compound showed good selectivity and activity, with the best TOF obtained at 66.4 h(-1) under mild reaction conditions. Temperature and molar ratio of oxidant to substrate were found to significantly influence the conversion and selectivity of the oxidation products.
Article
Chemistry, Inorganic & Nuclear
Zachary L. Magnuson, Randy W. Larsen
Summary: The Fe4SP@HKUST-1 metal organic framework system demonstrates efficient catalytic properties similar to enzyme substrate binding protein pockets. The encapsulation of Fe4SP within the MOF framework significantly enhances its catalytic performance while reducing degradation and maintaining selectivity. This provides a basis for developing bio-inspired heme-based MOF catalysts.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Physical
Shanka Dissanayake, Ninad Vora, Laura Achola, Yanliu Dang, Junkai He, Zachary Tobin, Xingxu Lu, Anne Mirich, Pu-Xian Gao, Steven L. Suib
Summary: Mesoporous manganese doped cerium oxide catalysts prepared by inverse micelle method show superior activity in epoxidation of alkenes, with high conversion rate and selectivity. The high catalytic activity can be attributed to the specific fluorite crystal structure, high oxygen mobility, and the unique mechanism involving in situ generated reactive oxygen species.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Jose C. S. Costa, Ricardo M. Campos, Angela C. M. Castro, Artur F. M. Farinha, Goncalo N. P. Oliveira, Joao P. Araujo, Luis M. N. B. F. Santos
Summary: Microdroplets and thin films of imidazolium-based ionic liquids (ILs) were used as confining agents for the formation of high-quality perylene crystals by vapor deposition. The study investigated the role of ILs in controlling the nucleation and growth of perylene, and found that longer-chain ILs showed higher adhesion and affinity. The co-deposition of perylene and ILs demonstrated the potential of ILs as solvents for the formation of thin organic films with improved crystalline quality and optoelectronic properties.
Article
Chemistry, Applied
Silvia Carvalho, Rosana V. Pinto, Joao Pires, Joao Rocha, Fernando Antunes, Moises L. Pinto
Summary: Four PEG composites were synthesized and characterized for their adsorption and release performance of hydrogen sulfide (H2S) and nitric oxide (NO). Cytotoxicity studies showed that the PEG composites had no toxicity to human cells.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Applied
Renata Matos, Iwona Kuzniarska-Biernacka, Mariana Rocha, Joao H. Belo, Joao Pedro Araujo, Ana C. Estrada, Joana L. Lopes, Tushti Shah, Brian A. Korgel, Clara Pereira, Tito Trindade, Cristina Freire
Summary: This study presents the preparation and characterization of nanocomposites of graphene flakes (GF) combined with CuS, Fe3O4, and CuS-Fe3O4. The adsorption and photocatalytic properties of the nanocomposites were evaluated using Rhodamine B (RhB) as the model contaminant. The results showed successful attachment of CuS and/or Fe3O4 nanoparticles onto GF. The GF@CuS-Fe3O4 nanocomposite exhibited the highest RhB adsorption efficiency and photocatalytic activity, completely eliminating the dissolved RhB after 60 minutes of irradiation.
Article
Chemistry, Multidisciplinary
Beatriz Matos, Mary Batista, Joao Pires
Summary: In the face of global warming and the energy crisis, it is crucial to reduce the emissions of greenhouse gases like CO2 and CH4 and recycle biomethane from landfill biogas. This study demonstrates the potential of converting glycerol, a by-product of biodiesel production, into activated carbon using potassium acetate as an activating agent. The activated carbon exhibits high adsorption capacities for CO2 and CH4, with selectivity values that enable effective separation. Additionally, the study finds that the CO2 emissions produced during activated carbon synthesis can be easily neutralized through their use in small biogas production units.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
B. G. F. Eggert, J. F. H. Belo, J. P. Araujo, B. C. Hauback, C. Frommen
Summary: A series of Mn1-xNi1-xFe2xSi0.95Al0.05 MM'X-type compounds were investigated as potential magnetocaloric materials. The martensitic transition temperatures of the compounds were adjusted by double substitution of Fe in Mn and Ni sites. The isothermal entropy changes were calculated and found to be comparable to those of similar MnNi(SiAl)-based compounds. High magnetic fields were found to be necessary for inducing the magnetostructural transition due to the presence of secondary phases and/or disorder.
Article
Chemistry, Physical
Mariana B. M. S. Martins, Gabriela A. Correa, Tania Moniz, Craig J. Medforth, Baltazar de Castro, Susana L. H. Rebelo
Summary: Binary porphyrin materials with oppositely charged Fe(III) and Mn(III) porphyrins have been prepared and tested as biomimetic models of catalase. The heterometallic material [Mn/Fe] showed the highest catalytic activity for H2O2 dismutation reaction, and an enhancement in activity of one to two orders of magnitude compared to individual porphyrins.
JOURNAL OF CATALYSIS
(2023)
Article
Physics, Applied
Rui M. Costa, Edmund Lovell, R. Almeida, R. M. C. Pinto, Lesley F. Cohen, A. M. Pereira, Joao P. Araujo, J. H. Belo
Summary: The magnetocaloric effect is largest near a first-order phase transition and can be used in magnetocaloric refrigeration, eliminating the need for greenhouse gases. However, this transition is accompanied by hysteresis and unique dynamical effects, which can be detrimental for refrigeration applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Mary Batista, Renato Carvalho, Moises L. Pinto, Joao Pires
Summary: Glycerin and dopamine were used as precursors to prepare microporous activated carbon adsorbent materials for the separation of ethane/ethylene and natural gas or landfill gas components. The activated carbons were produced through carbonization and chemical activation, with the introduction of nitrogenated groups to improve selectivity. Methane had the lowest adsorption capacity on the most effective material, followed by carbon dioxide, ethylene, and ethane.
Article
Biochemistry & Molecular Biology
Gabriela A. Correa, Susana L. H. Rebelo, Baltazar de Castro
Summary: Sustainable functionalization of renewable aromatics is crucial for the transition to a circular, fossil-free economy. In this study, typical stable aromatic compounds were successfully functionalized using a green catalytic system at room temperature. The results demonstrated unusual initial epoxidation of the aromatic ring, with high yields obtained for various products.
Article
Chemistry, Physical
Silvia Carvalho, Joao Pires, Cristina Moiteiro, Moises L. Pinto
Summary: A new imine-linked polymer organic framework with microporosity and temperature stability has been synthesized using inexpensive reagents. The material has a higher capacity to adsorb NO compared to H2S. This study explores the potential use of the framework in the therapeutic release of NO or H2S.
Article
Materials Science, Biomaterials
Andreia T. Pereira, Catia R. S. Rodrigues, Ana C. Silva, Ricardo Vidal, Joao O. Ventura, Ines C. Goncalves, Andrei M. Pereira
Summary: This study proposes the use of a hemo/biocompatible hydrogel material (poly-(2-hydroxyethyl methacrylate)) to overcome the limitations of triboelectric nanogenerators (TENGs) in the biomedical field. Graphene oxide (GO) is found to modulate the triboloelectric properties of the hydrogel in a concentration-dependent manner. The study also reveals the role of GO as an electron trapping site in the hydrogel matrix.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Analytical
Shayesteh Bazsefidpar, Maria Freitas, Clara R. Pereira, Gemma Gutierrez, Esther Serrano-Pertierra, Henri P. A. Nouws, Maria Matos, Cristina Delerue-Matos, Maria Carmen Blanco-Lopez
Summary: In this paper, a method for effectively controlling Escherichia coli (E. coli) O157:H7 in milk samples was developed. Monodisperse Fe3O4@Au magnetic nanoparticles were synthesized and used in an electrochemical sandwich-type magnetic immunoassay for rapid and accurate analysis. The assay showed a linear range from 20 to 2 x 10(6) CFU/mL, with a limit of detection of 20 CFU/mL for E. coli O157:H7. The selectivity of the assay was tested and the applicability was demonstrated by analyzing a commercial milk sample.
Article
Communication
Miguel Ferreira, Betina Lopes, Antonio Granado, Catarina Siopa, Hugo Gaspar, Helena Castro, Silvia Castro, Joao Loureiro
Summary: Video abstracts are a creative way for researchers to present scientific abstracts in an audio-visual format. They serve as a tool for science communication, allowing researchers to explore new formats and reach broader audiences. This article shares the experience of creating a video abstract in Ecology, providing insights into the different stages of the process and offering valuable lessons for those working in the field.
FRONTIERS IN COMMUNICATION
(2023)
Article
Biochemistry & Molecular Biology
Susana L. H. Rebelo, Cesar A. T. Laia, Monika Szefczyk, Alexandra Guedes, Ana M. G. Silva, Cristina Freire
Summary: Unveiling and shaping the molecular connectivity in (metallo)porphyrin-carbon nanotube hybrids is crucial for their various applications in medicine, photoelectronics, catalysis, and photocatalysis. This study successfully modified multi-walled carbon nanotubes through 1,3-dipolar cycloaddition reactions and demonstrated the presence of different porphyrin-carbon nanotube connectivity in the resulting nanohybrid. Photophysical studies further confirmed energy/charge transfer in the photoactivated nanohybrid.
Article
Chemistry, Inorganic & Nuclear
Hugo C. Novais, Bruno Jarrais, Israel-Martyr Mbomekalle, Anne-Lucie Teillout, Pedro de Oliveira, Cristina Freire, Diana M. Fernandes
Summary: This study focuses on the application of polyoxometalate-based electrocatalysts in the oxygen reduction reaction. The composites of polyoxometalate salt immobilized on graphene flakes and nitrogen-doped carbon nanotubes showed good ORR performance and stability.
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.
