Produção Nacional
Revisado por pares
Vinicius Ottonio O. Gonçalves, Walter Henrique S.M. Talon, Vinícius Kartnaller, Fabrício Venâncio, João Cajaiba, Thierry Cabioc’h, Jean‐Marc Clacens, Frédéric Richard,
Three bimetallic Ni-Co (Ni:Co ratio 1:3, 1:1 and 3:1) and two monometallic (Ni and Co) nanoparticles supported on Al2O3 were synthesized by incipient wet impregnation and characterized by various technics (N2-physisorption, XRD, H2-TPR, CO-chemisorption and elemental analysis). It was demonstrated by XRD that NiCo alloys nanoparticles were present on bimetallic solids. The catalytic properties of all catalysts were determined for the hydrodeoxygenation of m-cresol at 340 °C under 4 MPa of total pressure. ...
Tópico(s): Catalysis for Biomass Conversion
2020 - Elsevier BV | Catalysis Today
Produção Nacional
Revisado por pares
Marcelo T. Lima, Fernanda G. Finelli, Alline V. B. de Oliveira, Vinícius Kartnaller, João Cajaiba, Raquel A. C. Leão, Rodrigo O. M. A. de Souza,
Dimethyl fumarate (DMF) has recently gained attention due to its use as a pro-drug in different pharmaceutical preparations, here in we present our work on a cascade methodology in short reaction times and quantitative yields.
Tópico(s): Click Chemistry and Applications
2020 - Royal Society of Chemistry | RSC Advances
Produção Nacional
Revisado por pares
Gisele Zapata‐Sudo, Thaiana C.F. Mendes, Marcelle A. Kartnaller, Tiago O. Fortes, Nathália F.B. Freitas, Maria Auxiliadora Coelho Kaplan, Roberto T. Sudo,
Dorstenia arifolia is a plant that has been used in the folk medicine to produce hypnotic, sedative and ansiolitic effects but the pharmacological properties have not yet been studied. In addition, the smoke of its rhizome is reputed to induce lethargic sensation. The present study investigated possible activities of the methanol extract (ME) of Dorstenia arifolia rhizome on the central nervous system (CNS). ME was tested for sedative, hypnotic and anticonsulsant effects using locomotor activity evaluation, ...
Tópico(s): Bioactive natural compounds
2010 - Elsevier BV | Journal of Ethnopharmacology
Produção Nacional
Revisado por pares
Eloah P. Ávila, Isabella F. de Souza, Alline V. B. de Oliveira, Vinícius Kartnaller, João Cajaiba, Rodrigo O. M. A. de Souza, Charlane C. Corrêa, Giovanni W. Amarante,
A catalyst free decarboxylative trichloromethylation of imines to afford different trichloromethyl sulfonyl and sulfinyl amines has been presented.
Tópico(s): Chemical Synthesis and Reactions
2016 - Royal Society of Chemistry | RSC Advances
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Ivaldo Itabaiana, Adriana Velloso Alves de Souza, Ingrid C.R. Costa, Michelle Jakeline Cunha Rezende, João Cajaiba, Rodrigo O. M. A. de Souza,
Biodiesel is a mixture of fatty acid alkyl esters with properties similar to petroleum-based diesel. Thus, biodiesel can be used as either a substitute for diesel fuel or, more commonly, in a fuel blend. Biodiesel production can be catalyzed with mineral acids or bases or enzymes. The use of real-time techniques for monitoring the reaction and evaluating the efficiency of the catalyst can be of great use for optimizing the reaction and monitoring the process. In the present work, an in-line real- ...
Tópico(s): Petroleum Processing and Analysis
2015 - Elsevier BV | Journal of Molecular Catalysis B Enzymatic
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Fabrício Venâncio, F. F. Rosário, João Cajaiba,
To avoid gas hydrate formation during oil and gas production, companies usually employ thermodynamic inhibitors consisting of hydroxyl compounds, such as monoethylene glycol (MEG). However, these inhibitors may cause other types of fouling during production such as inorganic salt deposits (scale). Calcium carbonate is one of the main scaling salts and is a great concern, especially for the new pre-salt wells being explored in Brazil. Hence, it is important to understand how using inhibitors to control ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2018 - Multidisciplinary Digital Publishing Institute | Molecules
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Ediane Maria Gomes Ribeiro, Fabrício Venâncio, F. F. Rosário, João Cajaiba,
Experimental validation was given to molecular dynamics calculations regarding the preferential retention of sulfate ions in the calcite polymorph of calcium carbonate.
Tópico(s): Microbial Applications in Construction Materials
2018 - Royal Society of Chemistry | CrystEngComm
Produção Nacional
Revisado por pares
Rodrigo N. Guzzo, Michelle Jakeline Cunha Rezende, Vinícius Kartnaller, José Walkimar de M. Carneiro, Stanislav R. Stoyanov, Leonardo Moreira da Costa,
The density functional theory is employed to determine the efficiency of 11 exchange-correlation (XC) functionals to compute the 1H and 13C NMR chemical shifts of p-tert-butylcalix[4]arene (ptcx4, R1 = C(CH3)3) and congeners using the 6-31G(d,p) basis set. The statistical analysis shows that B3LYP, B3PW91 and PBE1PBE are the best XC functionals for the calculation of 1H chemical shifts. Moreover, the best results for the 13C chemical shifts are obtained using the LC-WPBE, M06-2X and wB97X-D functionals. ...
Tópico(s): Crystallography and molecular interactions
2017 - Elsevier BV | Journal of Molecular Structure
Produção Nacional
Revisado por pares
Victor Tozatto Verissimo Lobo, Ronald Wbeimar Pacheco Ortiz, Vinicius Ottonio O. Gonçalves, João Cajaiba, Vinícius Kartnaller,
Fumaric acid (FA) is an important commodity in the food and polymer industries; its main route of production is the chemical synthesis from maleic acid (MA). In this work, the isomerization of MA to FA catalyzed by thiourea was investigated. The experiments were performed in an automated reactor with temperature and stirring control, using methanol as the solvent to ensure a homogeneous system and to avoid a possible parallel hydration reaction to malic acid. The reaction kinetics was monitored in ...
Tópico(s): Ionic liquids properties and applications
2020 - American Chemical Society | Organic Process Research & Development
Produção Nacional
Revisado por pares
Bruno X. Ferreira, Carlos Roberto Hall Barbosa, João Cajaiba, Vinícius Kartnaller, Brunno Ferreira dos Santos,
The precipitation of gas hydrate and inorganic salts (scale) during oil and gas production represents a significant flow assurance hindrance for the industry. Chemical inhibitors can prevent the fouling process, but specific inhibitors to address a problem could result in synergistic or adverse effects. Simulations in tubes and pipelines are necessary to understand these behaviors by assessing the scaling tendency of the water. The primary objective of this study was to create models using an artificial ...
Tópico(s): Hydraulic Fracturing and Reservoir Analysis
2022 - American Chemical Society | Energy & Fuels
Produção Nacional
Revisado por pares
Alline V. B. de Oliveira, Ronald Wbeimar Pacheco Ortiz, Vinícius Kartnaller, Fabrício Venâncio, Vinicius Ottonio O. Gonçalves, João Cajaiba,
The pH is an important parameter to control in many industrial processes carried out at high pressures. However, the measurement of pH in pressurized systems is challenging due to the difficulty in the development of pH sensors resistant to these conditions. This work presents a low-cost technique using image analysis and the hs v ( hue, saturation, and value ) color system to measure the pH in atmospheric and pressurized systems. First, a calibration curve was prepared with buffer solutions in a pH ...
Tópico(s): Chemical and Physical Properties in Aqueous Solutions
2019 - IEEE Sensors Council | IEEE Sensors Journal
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Danielly C. O. Mariano, João Cajaiba,
The reaction between ammonium chloride and sodium nitrite has been known for its application as a source of heat because of its large enthalpy of reaction, for which it has been used by the oil industry. There have been no known calorimetric studies for the experimental determination of its molar enthalpy of reaction, which is necessary in order to predict the limits achieved for up-scale applications. Attenuated total reflection Fourier transform infrared spectroscopy (ATR FT-IR) and reaction calorimetry ...
Tópico(s): Thermal and Kinetic Analysis
2016 - SAGE Publishing | Applied Spectroscopy
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Marcos V. Romualdo, Victor Tozatto Verissimo Lobo, João Cajaiba,
Nitrogen-generating systems (NGS) have been used by the oil industry for treatments in flow assurance, because the system consists of a highly exothermic nitrosation reaction that can act as an in situ generator of heat for the fluidization of low-melting-point organic deposit or gas hydrate buildup. In this work, attenuated total reflection/Fourier transform infrared spectroscopy (ATR/FTIR) was used to monitor and quantify the components in the NGS reactions and a 24 central composite design of experiment ...
Tópico(s): Phase Equilibria and Thermodynamics
2015 - American Chemical Society | Energy & Fuels
Produção Nacional
Revisado por pares
Felipe J. S. Bispo, Vinícius Kartnaller, João Cajaiba,
Summary The highly exothermic reaction between ammonium chloride (NH4Cl) and sodium nitrite (NaNO2) has an important application in the area of flow assurance. Because of the high heat generation, this reaction has been used as a heat source for the fluidization of low-melting-point deposits formed during oil and gas production. Because this reaction is strongly pH dependent, the incorrect choice of pH can result in an uncontrollable temperature increase caused by the system’s inability to dissipate ...
Tópico(s): Crystallization and Solubility Studies
2021 - Society of Petroleum Engineers | SPE Journal
Produção Nacional
Revisado por pares
Alline V. B. de Oliveira, Vinícius Kartnaller, Cláudio Costa Neto, João Cajaiba,
Polymer-supported reagents have been extensively studied and used in various applications, such as condensation reactions and multiple component reactions. This paper examines the reactions between a solid-functionalized resin, named Amb15-Iso, and aldehydes and ketones that have been solubilized in different solvents. The reactions between these molecules and a hydrazide (isoniazid) in both neutral and acidic media were also studied. The results showed that the solvent polarity influenced the kinetics ...
Tópico(s): Multicomponent Synthesis of Heterocycles
2019 - American Chemical Society | ACS Omega
Produção Nacional
Fabrício Venâncio, Ronald Wbeimar Pacheco Ortiz, Tatiana S.L. Maravilha, Vinicius Ottonio O. Gonçalves, F. F. Rosário, Rosane Alves Fontes, Tiago C. Freitas, Thiago Geraldo da Silva, Vinícius Kartnaller, João Cajaiba,
Scale is one of the main flow assurance issues in oil and gas production because reduces productivity or even stops production. The evaluation of scale formation and performance of inhibitors under flow conditions is essential for managing this problem. A conventional method for this evaluation is the tube-blocking test performed in a dynamic scale loop (DSL) system monitoring the differential pressure caused by the scale formation. However, this system does not provide information to understand ...
Tópico(s): Minerals Flotation and Separation Techniques
2023 - Elsevier BV | Geoenergy Science and Engineering
Produção Nacional
Revisado por pares
Jessica Oliveira, Ronald Wbeimar Pacheco Ortiz, Nayanna Souza Passos, Fabrício Venâncio, Vinicius Ottonio O. Gonçalves, João Cajaiba, Regiane Ribeiro‐Santos, Daniel Perrone, Vinícius Kartnaller,
Tópico(s): Minerals Flotation and Separation Techniques
2023 - Springer Science+Business Media | Brazilian Journal of Chemical Engineering
Produção Nacional
Revisado por pares
Ronald Wbeimar Pacheco Ortiz, Alline V. B. de Oliveira, Fabrício Venâncio, Giuseppe Sampaio Almeida Cardoso, Vinicius Ottonio O. Gonçalves, João Cajaiba, Vinícius Kartnaller,
Abstract This work introduces a novel apparatus for monitoring both color and °Brix of selected fruit juices. These parameters are essential for quality and processing control at concentration and dilution operations. The proposed apparatus performs the red, green, and blue (RGB) image analysis of the fruit juice as it flows through a transparent cell equipped with a webcam and a light source. The viewing cell is inside a box for controlling temperature and for ensuring homogeneous lighting. This ...
Tópico(s): Advanced Chemical Sensor Technologies
2023 - Wiley | Journal of Food Process Engineering
Produção Nacional
Revisado por pares
Felipe J. S. Bispo, Vinícius Kartnaller, João Cajaiba,
A highly exothermic nitrogen generation system (NGS) can be achieved by mixing solutions of sodium nitrite and ammonium chloride, a process used by the oil and gas industry to dissolve paraffin wax and gas hydrates. Although its main products are nitrogen gas and a sodium chloride brine, the NGS has a side reaction that produces nitrogen oxides. To optimize this process to ensure the greatest and fastest heat generation with the lowest oxide production, this reaction was checked by infrared spectroscopy ...
Tópico(s): Mercury impact and mitigation studies
2019 - American Chemical Society | ACS Omega
Produção Nacional
Revisado por pares
Vinícius Kartnaller, Conny Cerai Ferreira, Santiago Villabona-Estupiñán, Elizabeth R. Lachter, Jorge de Almeida Rodrigues, Regina Sandra Veiga Nascimento, João Cajaiba,
The interaction between clay-rich shales formations and water is one of the most relevant factors for well instability in drilling operations, representing a significant challenge for the oil and gas industry. To minimize the problems related to water sensitivity, chemical additives or inhibitors are incorporated into water-based drilling fluids, acting over the water-shale interactions and maintaining the integrity of the sedimentary rock. In this work a novel approach is proposed to gain new information ...
Tópico(s): Drilling and Well Engineering
2017 - Elsevier BV | Applied Clay Science
Produção Nacional
Revisado por pares
Alline V. B. de Oliveira, Vinícius Kartnaller, Marcelo Sierpe Pedrosa, João Cajaiba,
ABSTRACT Over the past years, polymer‐supported reagents have been extensively studied and used in various applications. One class of such reagents is called “scavengers,” which can be used to easily eliminate compounds in a solution. The present work describes the production of a resin that can be used for scavenging ketones and aldehydes using low‐cost reagents and simple reaction steps, named here Amb15‐Iso. This resin is obtained by reacting a low‐cost commercial sulfonyl resin, Amberlyst‐15, ...
Tópico(s): Chemical Synthesis and Reactions
2015 - Wiley | Journal of Applied Polymer Science
Produção Nacional
Allan Belati, Fabrício Venâncio, Ronald Wbeimar Pacheco Ortiz, Vinicius Ottonio O. Gonçalves, Vinícius Kartnaller, João Cajaiba,
Tópico(s): Calcium Carbonate Crystallization and Inhibition
2023 - Springer Science+Business Media | Journal of the Brazilian Society of Mechanical Sciences and Engineering
Produção Nacional
Revisado por pares
Ronald Wbeimar Pacheco Ortiz, Tatiana S. L. Maravilha, Allan Belati, Felipe J. S. Bispo, Evelin A. Manoel, Vinicius Ottonio O. Gonçalves, Vinícius Kartnaller, João Cajaiba,
Abstract: Flow assurance encompasses the technical challenges of transporting hydrocarbon mixtures from the reservoir to the platform and refineries. Challenges in flow assurance include gas hydrate plugs, deposition of paraffin wax, asphaltenes, naphthenates, scale, and corrosion. Managing these deposits incurs high costs due to production interruptions and remediation operations like pigging, solvent injection, acid dissolutions, and thermal treatments. Therefore, prevention methods, such as the ...
Tópico(s): Hydrocarbon exploration and reservoir analysis
2024 - Bentham Science Publishers | Current Organic Chemistry
Produção Nacional
Revisado por pares
Ronald Wbeimar Pacheco Ortiz, Jessica Oliveira, Guilherme V. Vaz, Nayanna Souza Passos, Felipe J. S. Bispo, Vinicius Ottonio O. Gonçalves, João Cajaiba, Carlos A. Ortiz-Bravo, Vinícius Kartnaller,
Summary Scale is a significant operational concern in petroleum production that is commonly addressed by using chemical inhibitors. However, commercial inhibitors can potentially be pollutants depending on their composition and method of disposal. Consequently, evaluating the potential of biodegradable molecules to inhibit scale has gained attention. This study evaluates the effect of a series of carbohydrates (i.e., glucose, fructose, sucrose, maltose, maltodextrin, and soluble starch) and the aqueous ...
Tópico(s): Drilling and Well Engineering
2023 - Society of Petroleum Engineers | SPE Journal
Produção Nacional
Revisado por pares
Marcos Vinicius Miranda Mesquita, Alline V. B. de Oliveira, Felipe J. S. Bispo, Ronald Wbeimar Pacheco Ortiz, Fabrício Venâncio, Vinicius Ottonio O. Gonçalves, Vinícius Kartnaller, João Cajaiba,
Summary Nitrogen-generating systems (NGSs) are mainly used in the oil industry to fluidize low melting point organic deposits and gas hydrate buildups. They are exothermic reactions between two nitrogenous salts in acidic catalytic media. This work investigates the use of CO2 to promote NGS reactions instead of commonly used acids such as acetic and citric acids, which can be problematic for corrosion control. Sodium nitrite and ammonium chloride were the reactants, and CO2 performance was evaluated ...
Tópico(s): Petroleum Processing and Analysis
2022 - Society of Petroleum Engineers | SPE Journal
Allan Belati, João Cajaiba, Vinícius Kartnaller, Fabrício de Queiroz Venâncio,
Tópico(s): Plant Surface Properties and Treatments
2020 - | Technical Papers ... Rio Oil & Gas
F. F. Rosário, Thais dos Santos Lucena, Fabricio De Queirozvenancio, Vinícius Kartnaller, Mônica de Oliveira Penna, João Cajaiba,
Tópico(s): Thermal and Kinetic Analysis
2020 - | Technical Papers ... Rio Oil & Gas
Alline V. B. de Oliveira, Vinícius Kartnaller, Marcelo Sierpe Pedrosa, João Cajaiba,
[Article in J. Appl. Polym. Sci. 2015, 132, DOI: 10.1002/app.42291] In the published article cited above, the presentation of the 3rd author was provided incorrectly as Marcelo S. P. Pedrosa. This erratum corrects that by providing the updated author line as shown above.
Tópico(s): Process Optimization and Integration
2015 - Wiley | Journal of Applied Polymer Science