Article
Green & Sustainable Science & Technology
Wenlei Xie, Chunli Gao, Jiangbo Li
Summary: Efficient and reusable catalysts are desired for improved biodiesel production, and a solid catalyst was successfully developed by incorporating ZIF-8 MOF into Fe3O4 nanoparticles and encapsulating a vanadium-substituted heteropolyacid. The catalyst showed good magnetic responsiveness and achieved simultaneous transesterification of soybean oil and esterification of free fatty acids, with high conversion rates and good reusability.
Article
Energy & Fuels
Chuhua Jia, Cheng Zhang, Shaoqu Xie, Wanli Zhang, Ziling Wang, Hongfei Lin
Summary: Researchers have developed a novel biphasic catalytic process to efficiently produce bio-jet fuel from fatty acids, aiming to reduce the production costs in the aviation industry. By adjusting the catalyst and solvent, cracking selectivity can be tuned. The optimized Ru/C catalyst exhibits excellent performance, achieving high carbon yield of jet-fuel-range alkanes at relatively low temperatures.
Article
Energy & Fuels
Joao Lourenco Castagnari Willimann Pimenta, Mariana de Oliveira Camargo, Rafael Belo Duarte, Onelia Aparecida Andreo dos Santos, Luiz Mario de Matos Jorge
Summary: The study found that aerogel catalysts showed higher productivity and selectivity in the production of renewable diesel through deoxygenation of soybean oil, compared to impregnated catalysts. Additionally, the specific acidity of the catalyst appears to directly influence the cracking extent, which in turn affects its selectivity.
Review
Chemistry, Multidisciplinary
Cristian-Dragos Varganici, Liliana Rosu, Dan Rosu, Fanica Mustata, Teodora Rusu
Summary: This article discusses the increasing environmental restrictions on wood products in outdoor environments, due to aging caused by climate factors such as light, water, and biodegradation. Traditional wood coatings are being phased out for safer alternatives like those made from vegetable oils and epoxy resins, which offer better compatibility with wood surfaces and higher crosslinking capabilities.
ENVIRONMENTAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Environmental
Tarsila F. de Castro, Daniela Cortez, Daniel B. Goncalves, Heitor B. S. Bento, Rhyan L. N. Goncalves, Tales A. Costa-Silva, Bruno C. Gambarato, Heizir F. de Castro, Ana Karine F. de Carvalho
Summary: This study investigates the direct use of Penicillium cells as biocatalysts for hydrolyzing vegetable oils under low-power ultrasonic irradiation. The results show that Penicillium cells with specific lipase can efficiently hydrolyze vegetable oils high in fatty acids, and ultrasound waves can improve the reaction efficiency. However, the presence of fatty acids with 18 carbons in the substrate negatively affects the hydrolysis.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Review
Chemistry, Applied
Fahimeh Esmi, Venu Babu Borugadda, Ajay K. Dalai
Summary: This review provides a comprehensive overview of the utilization of various types of plant oils and heterogeneous catalysts for biodiesel production. The advantages and challenges of supported heteropoly acid catalysts are highlighted, and methods to improve catalyst activity and reusability are discussed. The review serves to indicate the advances of supported heteropoly acid catalysts as efficient heterogeneous solid acid catalysts over other types of catalysts.
Article
Polymer Science
Rafael T. Alarcon, Katie J. Lamb, Eder T. G. Cavalheiro, Michael North, Gilbert Bannach
Summary: Carbon dioxide (CO2) is naturally occurring but its emissions have increased due to human activities and its rising atmospheric concentration is causing global warming. Researchers explored the catalyzed reaction of CO2 with epoxidized vegetable oil to create carbonated oils for new and sustainable monomers. By screening different reaction conditions, they achieved 100% conversion using the aluminum(salen) complex as a catalyst. The resulting carbonated oils were then reacted with amines to produce weldable polyhydroxyurethanes with various properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Eva Faillace, Virginie Brunini-Bronzini de Caraffa, Magali Mariani, Liliane Berti, Jacques Maury, Sophie Vincenti
Summary: In this study, three oils (sunflower, hempseed, and linseed oils) and three lipases (Candida rugosa, Pseudomonas fluorescens, and Rhizomucor miehei lipases) were tested to optimize the hydrolysis conditions in the biocatalytic process. Experimental design and response surface methodology (RSM) were used to determine the optimal conditions, and Candida rugosa lipase showed the highest conversion rates for sunflower, hempseed, and linseed oils under the optimized conditions.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Thermodynamics
F. A. F. Menezes, A. B. Rangel, T. C. Cordeiro, H. Vargas, E. C. da Silva
Summary: Measurements of phase transitions in vegetable oils revealed differences in light transmission and absorption rates, with high viscosity oils showing a supercooling effect. Low viscosity macauba biodiesel did not exhibit this effect.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Review
Energy & Fuels
Eslam A. Mohamed, Mohamed Ahmed Betiha, Nabel A. Negm
Summary: Recent advances in the creation of efficient and low-cost heterogeneous catalysts for the transesterification reactions of triglyceride molecules have been reported. These catalysts aim to decrease the overall cost of biofuel production. The review focuses on the characteristics of different types of catalysts and their efficiency, as well as the factors affecting their performance. It also discusses the reaction parameters, mechanism, and future opportunities and challenges in biodiesel production using these catalysts.
Article
Food Science & Technology
Zuoyong Zhang, Shudong He, Luji Zhang, Xinjiang Li, Risheng Jin, Qian Liu, Shuguan Chen, Junhui Wang, Hanju Sun
Summary: Different vegetable oils combined with enzymatic hydrolysis-thermal oxidation (ENTH) were used in Maillard reaction (MR) system to produce meaty aroma. Coconut oil and palm oil showed better quality, while corn, peanut, and olive oils promoted the reaction and facilitated the formation of volatile compounds. Addition of ENTH oils reduced the content of oxygen, nitrogen, and sulfur-containing heterocycles.
FOOD RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Martin Ertl, Uwe Monkowius, Kerstin T. Oppelt
Summary: This study investigates the reactivity of a series of Re tricarbonyl complexes with 8-(diphenylphosphanyl)quinoline or 8-(diphenylarsanyl)quinoline as bidendate ligands, comparing them with other complexes. Electrochemical and spectroelectrochemical methods were employed, along with time-resolved spectroscopy, to study the peculiar reactivity of these complexes, including reduction reactions and reactions involving protons.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Willian S. M. Reis, Alexandre B. Matias, Adriano A. Mendes, Heizir F. de Castro, Ernandes B. Pereira
Summary: The study successfully produced a mycelium-bound lipase of the fungus Rhizopus oryzae CCT3759 with high hydrolytic activity in different vegetable oils, especially in olive oil. The optimal cultivation conditions and kinetic parameters of the enzyme were investigated, providing valuable insights for its potential application as a biocatalyst in the hydrolysis of vegetable oils.
Article
Chemistry, Multidisciplinary
Ioannis Nikolopoulos, George Kogkos, Vasiliki D. Tsavatopoulou, Eleana Kordouli, Kyriakos Bourikas, Christos Kordulis, Alexis Lycourghiotis
Summary: Two nickel alumina catalysts were synthesized by different methods and evaluated for their catalytic efficiency in the transformation of sunflower oil into green diesel. The catalyst prepared by co-precipitation showed higher efficiency due to its higher specific surface area and smaller nickel nanoparticle size compared to the catalyst prepared by wet impregnation. Increasing the activation temperature resulted in larger nickel nanoparticles and decreased catalytic efficiency. The optimized reaction conditions achieved complete transformation of sunflower oil and waste cooking oil into green diesel with high yield.
Article
Multidisciplinary Sciences
Matthew W. Herman, Kevin P. Furlong
Summary: The Shumagin Islands region of the Alaska subduction zone was identified as a seismic gap expected to host a future great earthquake. Recent earthquakes in the region have raised the possibility of increased coupling. Research shows that the coupling level in the region has a significant impact on the type and location of potential earthquakes.
Article
Engineering, Chemical
Marcio Jose da Silva, Diego Morais Chaves, Sukarno Olavo Ferreira, Rene Chagas da Silva, Jose Balena Gabriel Filho, Carlos Giovani Oliveira Bruziquesi, Abdulrahman A. Al-Rabiah
Summary: Phosphomolybdic acid salts were synthesized and evaluated as catalysts for the etherification reactions of glycerol with tert-butyl alcohol, with Sn(II) cations exchanged for their protons. Among the tested Sn(II) heteropoly salts, Sn3PMo12O40 showed the highest activity and selectivity towards glyceryl ethers, attributed to its greater Lewis acidity strength. Economic analysis indicated the viability of the process with a return on investment (ROI) of 30.7% for an annual production capacity of 30,000 metric tons.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Fabio C. Riemke, Catia L. Ucker, Neftali L. Carreno, Sergio da Silva Cava, Moises P. Teixeira, Humberto Fajardo, Jason G. Taylor, Marcio J. da Silva, Daniel C. Batalha, Cristiane W. Raubach
Summary: There is a growing interest in the search for environmentally friendly catalysts, particularly solid metal oxides. This study investigates the efficiency of SrTiO3 and the SrTiO3/Nb2O5 catalytic system in the oxidation process of thioanisole. The catalyst was synthesized through microwave-assisted hydrothermal process, and it was found that SrTiO3 nanoseeds have an inducing effect on the growth of Nb2O5. The SrTiO3/Nb2O5 catalyst exhibited high efficiency in the oxidation reaction of thioanisole.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Marcio Jose da Silva, Pedro Henrique de Andrade da Silva, Sukarno Olavo Ferreira, Rene Chagas da Silva, Carlos Giovani Oliveira Brusiquezi
Summary: Keggin heteropolyacids (HPAs) are versatile catalysts with adjustable properties through structural modification. This study evaluated the effects of structure modification on the catalytic performance by synthesizing a series of cobalt-polyoxometalates and found that K6CoW12O40 salt exhibited the highest activity and selectivity.
Article
Chemistry, Physical
Marcio Jose da Silva, Claudio Junior Andrade Ribeiro, Castelo Bandane Vilanculo
Summary: This study assessed the activity of various Bronsted acid catalysts in the oxidative esterification reaction of benzaldehyde. It was found that the Vanadium-doped phosphomolybdic acid H5PMo10V2O40 showed the highest activity and selectivity. The doping of Vanadium increased the redox potential of the catalyst and accelerated the reaction step.
Correction
Chemistry, Multidisciplinary
Marcio Jose da Silva, Pedro Henrique Andrade da Silva, Sukarno Olavo Ferreira, Rene Chagas da Silva, Carlos Giovani Oliveira Brusiquezi
Article
Chemistry, Physical
Marcio Jose da Silva, Claudio Junior Andrade Ribeiro, Alana Alves Rodrigues
Summary: In this study, catalysts with the general formula H3+nPMo12-nVnO40 (n = 0, 1, 2 and 3) were used to replace molybdenum atoms with vanadium, and these catalysts were applied in the acetalization reaction of alkyl alcohols with terpene aldehyde. The focus was on evaluating the impact of vanadium load on the catalytic activity of phosphomolybdic acids and linking this effect with their structural properties. The results showed that the vanadium monosubstituted phosphomolybdic acid had the highest activity and selectivity in the formation of beta-citronellyl acetal. The effects of various reaction variables on conversion and selectivity were also investigated.
Article
Chemistry, Physical
Marcio Jose da Silva, Pedro Henrique da Silva Andrade
Summary: In this study, tungstic acid was used as a catalyst for the oxidation of terpene alcohols with hydrogen peroxide for the first time. The catalyst, which is simple, solid, and commercially available, efficiently converted borneol, geraniol, and nerol to camphor and epoxide products. Various reaction parameters were investigated, and conversions and selectivity greater than 90% were achieved using 1.0 mol% of H2WO4 after 2 hours of reaction at 90 degrees C. The catalyst could be easily recovered and reused without loss of activity. This is the first time that tungstic acid has been used as a catalyst for the oxidation reactions of terpene alcohols.
CATALYSIS SURVEYS FROM ASIA
(2023)
Review
Energy & Fuels
Marcio Jose da Silva, Neide Paloma Goncalves Lopes, Alana Alves Rodrigues
Summary: This article discusses the chemical transformation of glycerol to various compounds with high technological applications, especially in the fuel sector as bioadditives. The Keggin heteropolyacids (HPAs) are efficient catalysts in the syntheses of glycerol-derived bioadditives. However, their use as heterogeneous catalysts is hindered by their low surface area and solubility in polar solvents. Solid heteropoly salts, formed by converting HPAs to insoluble salts, have shown promise in reducing the cost and environmental impact of bioadditive synthesis processes.
Review
Chemistry, Inorganic & Nuclear
Marcio Jose da Silva, Alana Alves Rodrigues, Neide Paloma Goncalves Lopes
Summary: Keggin heteropolyacids can be converted to metal salts to improve their catalytic performance in oxidation reactions. The use of green oxidants reduces the environmental impact and has significant implications for various industries.
Article
Chemistry, Physical
Marcio Jose da Silva, Pedro Henrique da Silva Andrade, Tiago Almeida Silva, Mariana Beatriz Teixeira Diniz, Sukarno Olavo Ferreira, Rene Chagas da Silva, Eduardo Nery Duarte de Araujo
Summary: Silicotungstic acid-derived salts with Co(II) or Co(III) cations were used as catalysts in the oxidation reactions of terpenic alcohols. The (K5CoW12O40)-W-III salt exhibited the highest activity and selectivity towards the oxidation product camphor, achieving conversion and selectivity higher than 90%. The effects of temperature, stoichiometry of reactants, and catalyst load on the reaction were investigated, and a reaction pathway was proposed based on the experimental data.
Article
Environmental Sciences
Neide Paloma Goncalves Lopes, Fabiane Carvalho Ballotin, Ana Paula de Carvalho Teixeira, Rochel Montero Lago, Marcio Jose da Silva
Summary: In this study, an efficient renewable carbon catalyst obtained from bio-oil sulfonation was used for the first time to produce terpene acetals at room temperature. The catalyst was obtained by reacting bio-oil with sulfuric acid and showed very strong acid sites. The condensation reactions of ss-citronellal and alkyl alcohols achieved high conversion and selectivity, and the catalyst could be reused four times without significant activity loss. The use of renewable solid catalysts with recyclability and activity at room temperature is a positive aspect of this process.
WASTE AND BIOMASS VALORIZATION
(2023)
Article
Engineering, Chemical
Marcio Jose da Silva, Claudio Junior Andrade Ribeiro, Eduardo Nery de Araujo, Isadora Merighi Torteloti
Summary: In this study, vanadium-substituted cesium phosphomolybdate salts were synthesized and evaluated as catalysts for the acetalization of benzaldehyde with alkyl alcohols. The Cs4PMo11V1O40 salt exhibited the highest activity and selectivity, converting benzaldehyde into methyl benzyl acetal and benzoic acid without the need for an oxidant. The catalytic activity was found to be influenced by the Bronsted acidity of the catalyst. This solid catalyst offers advantages over liquid homogeneous catalysts, including low corrosiveness, minimal waste generation, and easy recovery/reuse, and provides a potential alternative route for acetal synthesis.
Article
Chemistry, Physical
Alana Alves Rodrigues, Marcio J. da Silva, Sukarno Olavo Ferreira, Rene Chagas da Silva, Tiago Almeida Silva, Eduardo Nery Duarte de Araujo
Summary: Phosphomolybdate salts were synthesized by exchanging the protons of the phosphomolybdic acid with various metal cations. These catalysts were evaluated for their oxidation reactions of terpene alcohols using hydrogen peroxide. The physicochemical properties of the catalysts were correlated with their performance, and AlPMo12O40 was found to be the most active and selective catalyst.
MOLECULAR CATALYSIS
(2023)
Article
Chemistry, Physical
Aldino Neto Venancio, Claudio Junior Andrade Ribeiro, Armanda Aparecida Julio, Luciano Menini, Luciana Alves Parreira, Gustavo Rodrigues de Souza, Marcio Jose da Silva
Summary: Inexpensive and simple commercial transition metal salts were evaluated as catalysts for the acetalization reaction between alkyl alcohols and beta-citronellal. FeCl3 was found to be the most active and selective catalyst, with reaction conversion and selectivity influenced by various reaction parameters and the oxidation state and type of anion in the salt. The high activity of FeCl3 was attributed to its strong Lewis acidity. This catalyst offers advantages over traditional liquid mineral acid catalysts and provides an alternative route for synthesizing alkyl terpene acetals.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Marcio Jose da Silva, Jonh Alexander Vergara Torres, Castelo Bandane Vilanculo
Summary: This study evaluated the application of vanadium-doped phosphomolybdic acids as catalysts in green oxidation reactions and assessed the effect of vanadium doping on the catalysts' performance.
