A5090450520- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Nanomaterials for catalytic reactions
- Electrocatalysts for Energy Conversion
- Catalysis and Hydrodesulfurization Studies
- Covalent Organic Framework Applications
- Catalysis for Biomass Conversion
- Bauxite Residue and Utilization
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Ammonia Synthesis and Nitrogen Reduction
- Gas Sensing Nanomaterials and Sensors
- Oxidative Organic Chemistry Reactions
- Catalysis and Oxidation Reactions
- Perovskite Materials and Applications
- Advanced Nanomaterials in Catalysis
- Chemical Synthesis and Reactions
- Copper-based nanomaterials and applications
- Extraction and Separation Processes
- Iron oxide chemistry and applications
- Metal-Organic Frameworks: Synthesis and Applications
- TiO2 Photocatalysis and Solar Cells
- Crystallography and molecular interactions
- Nanocluster Synthesis and Applications
- Electronic and Structural Properties of Oxides
Universidade Federal de São Carlos
2019-2025
University of Beira Interior
2025
University of Minho
2025
Universidade de São Paulo
2018-2024
Brazilian Agricultural Research Corporation
2024
Max Planck Institute of Colloids and Interfaces
2021-2023
University of Oxford
2015-2018
Science Oxford
2015-2017
Universidade Federal de Minas Gerais
2010-2015
University of Guelph
2013
Ultrathin (1–3 cationic-layers) (CuZn)1–xGax-CO3 layered double hydroxide (LDH) nanosheets were synthesized following the aqueous miscible organic solvent treatment (AMOST) method and applied as catalyst precursors for methanol production from CO2 hydrogenation. It is found that, upon reduction, treated LDH (AMO-LDH) samples above a critical Ga3+ composition give consistently significantly higher Cu surface areas dispersions than catalysts prepared conventional hydroxyl-carbonate phases....
Bio-based nanocomposites were obtained through covalent linkage between cellulose nanocrystals (CNCs) and the natural polymer chitosan (CH). The CNCs first functionalized with methyl adipoyl chloride (MAC) reactive end groups on surface of reacted amino CH biopolymer in an aqueous medium. resulting characterized using FTIR, TEM, XRD, elemental analyses. Characterization showed that up to 8% hydroxyl substituted by MAC residue. was confirmed FTIR spectroscopy. demonstrated a significant...
Abstract We report a novel catalytic conversion of biomass‐derived furans and alcohols to aromatics over zeolite catalysts. Aromatics are formed via Diels–Alder cycloaddition with ethylene, which is produced in situ from ethanol dehydration. The use liquid instead gaseous as the source dienophile this one‐pot synthesis, makes production much simpler renewable, circumventing ethylene at high pressure. More importantly, both our experiments theoretical studies demonstrate that results...
Nano metal oxides are becoming widely used in industrial, commercial and personal products (semiconductors, optics, solar cells, catalysts, paints, cosmetics, sun-cream lotions, etc.). However, the relationship of surface features (exposed planes, defects chemical functionalities) with physiochemical properties is not well studied primarily due to lack a simple technique for their characterization. In this study, solid state 31P MAS NMR map surfaces on various ZnO samples assistance...
Abstract The hydrogen evolution reaction (HER) is a complex involving many interdependent physicochemical steps. Highly ordered carbon nitride‐based materials, such as Na‐PHI and K‐PHI, display some of the highest activities for H 2 among due to their electronic properties, but also presence cyanimide terminations, which favors charge transfer Pt cocatalyst nanoparticles (NPs). For highly optimized semiconductor structures, necessity control improve other steps photocatalytic process becomes...
Abstract Renewable‐electricity‐powered carbon dioxide (CO 2 ) reduction (eCO R) to high‐value fuels like methane (CH 4 holds the potential close cycle at meaningful scales. However, this kinetically staggered 8‐electron multistep suffers from inadequate catalytic efficiency and current density. Atomic Cu‐structures can boost eCO R‐to‐CH selectivity due enhanced intermediate binding energies (BEs) resulting favorably shifted d‐band centers. In work, 2D nitride (CN) matrices, viz....
Photocatalysis provides a sustainable pathway to produce the consumer chemical H2O2 from atmospheric O2 via an oxygen reduction reaction (ORR). Such alternative is attractive replace cumbersome traditional anthraquinone method for synthesis on large scale. Carbon nitrides have shown very interesting results as heterogeneous photocatalysts in ORR because their covalent two-dimensional (2D) structure believed increase selectivity toward two-electron process. However, efficient and scalable...
Abstract The use of surface-directing species and surface additives to alter nanoparticle morphology physicochemical properties particular exposed facets has recently been attracting significant attention. However, challenges in their chemical analysis, sometimes at trace levels, understanding roles elucidate structure–activity relationships optical (solar cells) or (photo)catalytic performance removal are issues that remain be solved. Here, we show a detailed analysis TiO 2 promoted with...
Potassium poly (heptazine imide) (K-PHI), a crystalline two-dimensional carbon–nitride material, is an active photocatalyst for water splitting. The potassium ions in K-PHI can be exchanged with other to change the properties of material and eventually design catalysts. We report here electronic structures several ion-exchanged salts (K, H, Au, Ru, Mg) their feasibility as splitting photocatalysts, which were determined by density functional theory (DFT) calculations. DFT results are...
Abstract Materials dictate carbon neutral industrial chemical processes. Visible‐light photoelectrocatalysts from abundant resources will play a key role in exploiting solar irradiation. Anionic doping via pre‐organization of precursors and further co‐polymerization creates tuneable semiconductors. Triazole derivative‐purpald, an unexplored precursor with sulfur (S) container, combined different initial ratios melamine during one solid‐state polycondensation two thermal steps yields hybrid...
A simple but effective method to exfoliate bulk MoS2 in a range of solvents is presented for the preparation colloid flakes consisted one few molecular layers by application ultrasonic treatment N2 H4 . Their high yield solution and exposure more active surface sites allows synthesis corresponding solid catalysts with remarkably activity hydrodeoxygenation 4-methylphenol this can also be applied other two dimensional materials.
Selective release of hydrogen from formic acid (FA) is deemed feasible to solve issues associated with the production and storage hydrogen. Here, we present a new efficient photocatalytic system consisting CdS nanorods (NRs), Ni, Co liberate FA. The optimized noble-metal-free catalytic employs Ni/Co as redox mediator relay electrons holes NRs Ni Co, respectively, which also deters oxidation NRs. As result, high activity 32.6 mmol h-1 g-1 decomposition FA was noted. Furthermore, exhibits...
Herein, we report a synthetic strategy to convert biomass-derived unsubstituted furan aromatics at high selectivity, especially ethylbenzene via alkylation/Diels–Alder cycloaddition using ethanol, while greatly reducing the formation of main side product, benzofuran, over zeolite catalysts. Using synchrotron X-ray powder diffraction and first-principles calculations, it is shown that above methodology favors aromatic products due ready alkylation by first ethanol molecule, followed...
Here we report a photocatalytic system based on crystalline carbon nitrides (PHI) and highly dispersed transition metals (Fe, Co Cu) for controlled methane photooxidation to methanol under mild conditions. The Cu-PHI catalyst showed remarkable production (2900 μmol g-1) in 4 hours, with turnover number of 51 moles oxygenated liquid product per mole Cu. To date, this result is the highest value oxidation conditions (1 bar, 25 °C).
Single-atom catalysis is a field of paramount importance in contemporary science due to its exceptional ability combine the domains homogeneous and heterogeneous catalysis. Iron manganese metalloenzymes are known be effective C─H oxidation reactions nature, inspiring scientists mimic their active sites artificial catalytic systems. Herein, simple versatile cation exchange method successfully employed stabilize low-cost iron single-atoms poly(heptazine imides) (PHI). The resulting materials...
In this work, we investigated a series of carbon nitride-based nanomaterials (CNs), i.e., H-PHI, mpg-C3N4, PCN, Na-PHI, Mg-PHI, CN-OA-m, and LiK-PHI, as candidate catalysts for biodiesel synthesis. The heterogeneous catalyst design based on CNs, with tunable catalytic sites inexpensive syntheses, can allow production to become more sustainable process, helping meet future energy demands. Transesterification canola oil methanol using LiK-PHI catalyst, under the optimized conditions, displayed...
Magnetic amphiphilic nanocomposites (MANCs) based on nanoalumina and carbon nanostructures were produced applied as catalysts for biphasic reactions. These composites exhibit an excellent interaction at the interface of systems composed immiscible liquids can form stable emulsions between them. Being magnetic, also be used to break other or make formed reversible. In this work, we report first use magnetic promote reactions undergoing a magnetically reversible emulsion process. Fe Mo...
Graphitic-C3N4 is shown for the first time to catalyse photoacetalization of aldehydes/ketones with alcohols acetals in high yields using visible light under ambient conditions; transient charge separation over material effective reaction absence Lewis or Brønsted acids, giving a new green alternative catalyst.