Article
Engineering, Mechanical
G. Rajasozhaperumal, C. Kannan
Summary: Petroleum lubricants have negative impacts on the environment and are not biodegradable. Plant-derived oils are renewable and can be used as biolubricants. This study aimed to enhance the oxidative stability of Jatropha curcas oil (JCO) through various chemical modifications. The functional groups and molecular structure of the modified oils were determined using spectroscopic techniques, and their physiochemical, thermal, rheological, and oxidative stability properties were assessed. Tribological tests showed that estolides and epoxidized Jatropha significantly reduced friction, making them potential biolubricants.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Fareeha Marriam, Adnan Irshad, Isra Umer, Muhammad Arslan Asghar, Muhammad Atif
Summary: Epoxy is widely used in industry for various applications, but its production from fossil fuels causes environmental pollution. Epoxidized vegetable oils (EVOs) are a potential replacement for fossil fuel-based epoxy due to their abundance, renewability, non-toxicity, and environmental friendliness. This review provides a compilation of information on different methods of oxidizing vegetable oils and the applications of epoxidized vegetable oils.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2023)
Article
Engineering, Manufacturing
Tapas Chakraborty, Deepti Ranjan Sahu, Amitava Mandal, Bappa Acherjee
Summary: This study investigates the effectiveness of vegetable oil as a dielectric fluid in electrical discharge machining (EDM). The experiments compared the performance of Jatropha biodiesel, Rice bran biodiesel, and EDM oil as dielectric fluids. The results show that the material removal rate patterns of Jatropha biodiesel and Rice bran biodiesel are similar to that of EDM oil. However, Jatropha biodiesel generally exhibits better surface quality than Rice bran biodiesel and both vegetable oils outperform the EDM oil. The study also highlights the issues related to the sustainability and biodegradability of dielectric fluids and suggests that transesterified Jatropha oil and Rice Bran oil can be introduced as sustainable and biodegradable alternatives in EDM.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Green & Sustainable Science & Technology
Martin Hajek, David Kocian, Miroslav Douda
Summary: The increasing consumption of glycerol poses a challenge for further applications of methyl esters, which are produced along with glycerol through transesterification. One potential solution is the formation of bio-epoxides, which can serve as bio-lubricants, chemical precursors, or CO2 capture agents, substituting products derived from crude oil. Therefore, mathematical models were developed to describe the epoxidation of methyl esters and determine the influence of reaction conditions on the properties of the epoxides. It was found that the initial iodine value of esters, reaction temperature, concentration of formic acid, and reaction time significantly influenced epoxide formation.
Article
Agricultural Engineering
Giuditta C. Heinzl, Danyelle A. Mota, Valentina Martinis, Ana Sofia Martins, Cleide M. F. Soares, Natalia Osorio, Jorge Gominho, K. Madhavan Nampoothiri, Rajeev K. Sukumaran, Helena Pereira, Suzana Ferreira-Dias
Summary: This study investigates the direct utilization of high acidic olive pomace oil (OPO) to produce added-value compounds using lipases. The results demonstrate the successful production of low-calorie dietetic structured lipids, biodiesel, and emulsifiers from OPO. The immobilized Rhizomucor miehei lipase shows high activity in acidolysis and interesterification, with minimal impact from OPO acidity. Complete conversion of OPO into fatty acid methyl esters and sn-2 monoacylglycerols is achieved through transesterification, with negligible lipase deactivation after multiple cycles.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Chiara Di Mauro, Aratz Genua, Alice Mija
Summary: In this study, a simple and benign synthesis strategy was proposed to produce fully bio-based materials using itaconic acid and two epoxidized vegetable oils. The reactive mixtures showed high reactivity and the obtained resins exhibited good mechanical properties, high thermal stability, and solvent resistance. The materials also demonstrated recycling capability through transesterification reaction.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Polymer Science
Fabio Bertini, Adriano Vignali, Marcello Marelli, Nicoletta Ravasio, Federica Zaccheria
Summary: This study focuses on the preparation of styrene-free thermosetting resins using vegetable oils and terpenic comonomers, which not only addresses environmental and safety concerns but also allows for tunable physical properties. The potential applications of these resins in combination with natural fibers have also been explored.
Review
Polymer Science
Yee Heng Ho, Anupreetha Parthiban, Min Chyong Thian, Zhen Hong Ban, Parthiban Siwayanan
Summary: Chemically modified vegetable oils have become commercially attractive due to their characteristics as being inexpensive, nontoxic, biodegradable, and renewable products. Acrylated epoxidized vegetable oil, a biopolymer with multiple applications as a coating material, faces challenges in achieving the performance of similar petroleum-derived acrylated polymers.
INTERNATIONAL JOURNAL OF POLYMER SCIENCE
(2022)
Review
Biotechnology & Applied Microbiology
Gabriel Baioni e Silva, Taina Manicardi, Andreza A. Longati, Electo E. S. Lora, Thais S. Milessi
Summary: This article explores biodiesel production routes focusing on jatropha and castor bean, comparing them with soy bean as a commonly used raw material. The transesterification process using homogeneous chemical catalysts showed better scores, but considering the technical and environmental advantages of biochemical and heterogeneous routes, environmental impact studies such as life cycle analysis can help determine the most appropriate production route.
BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
(2023)
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)
Article
Food Science & Technology
Yi-Hsiou Tsai, Donyau Chiang, Yu-Ting Li, Tsong-Pyng Perng, Sanboh Lee
Summary: In this study, the properties of sunflower, soybean, olive, and canola oils were examined periodically at different elevated temperatures. It was found that the unsaturated triglyceride in oils reacts significantly with environmental oxygen or water vapor, leading to changes in optical absorbance, viscosity, electrical impedance, and acid value. Olive oil has the lowest rate of color center and dynamic viscosity among the four oils, with the smallest pre-exponential factor and the largest activation energy. The rate constants of the acid reaction in olive oil are the highest among the four oils, with the lowest pre-exponential factor.
Article
Multidisciplinary Sciences
Riccardo Polese, Elisa Pintus, Luca Nuvoli, Monica Tiana, Salvatore Pintus, Giuseppe Satta, Andrea Beccu, Silvia Gaspa, Massimo Carraro, Lidia De Luca, Ugo Azzena, Luisa Pisano
Summary: Heterogeneous acid catalysts, including various acidic ion exchange resins, were utilized to study the acid-promoted epoxidation of vegetable oils. The more efficient catalyst and experimental conditions were identified to achieve quantitative and selective epoxidation of different types of vegetable oils with varying compositions of saturated, mono-, di-, and tri-unsaturated fatty acids. The optimized reaction conditions were successfully applied to the epoxidation of waste cooking oil, contributing to the valorization of biowaste in a sustainable society. The use of quantitative HNMR-H-1 facilitated accurate evaluation of reagent amounts, selectivity, and quantification of mono-, di-, and tri-epoxides, providing insights into the fatty acid composition of vegetable oils even with low quantities of linolenic acid present.
ROYAL SOCIETY OPEN SCIENCE
(2022)
Article
Chemistry, Physical
Yudong Meng, Nasreddine Kebir, Xiaoshuang Cai, Sebastien Leveneur
Summary: This study investigated the kinetics of epoxidation of cottonseed oil using the solid acid catalyst Amberlite IR-120 with propionic acid as the peroxide. A Bayesian inference method was used to develop an in-depth kinetic model, and the reaction pathway for ring opening was explored. The use of weak acid propionic acid allowed for a decrease in the side reaction of oxirane ring opening.
Article
Biochemistry & Molecular Biology
Joana Souza-Goncalves, Arsenio Fialho, Cleide M. F. Soares, Natalia M. Osorio, Suzana Ferreira-Dias
Summary: This study focuses on the production of low-calorie structured triacylglycerols (TAGs) by acidolysis or interesterification of crude olive pomace oil (OPO) with medium-chain fatty acids. The new TAGs contain medium-chain fatty acids at sn-1,3 positions and long-chain fatty acids at sn-2 position.
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
Polymer Science
David A. Echeverri, William A. Perez, Helen C. Inciarte, Luis A. Rios
JOURNAL OF APPLIED POLYMER SCIENCE
(2020)
Article
Green & Sustainable Science & Technology
Fernando Cardeno, Magin Lapuerta, Luis Rios, John R. Agudelo
Article
Engineering, Environmental
D. A. Echeverri, W. A. Perez, H. C. Inciarte, L. A. Rios
Summary: The study investigated the performance of a methyl methacrylate copolymer obtained from bioglycerol in weathering and biodegradation processes. Results showed that under long-term environmental exposure, the material undergoes some chemical changes, and microbial action leads to fungi colonization and surface damage.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Juan I. del Rio, William Perez, Fernando Cardeno, James Marin, Luis A. Rios
Summary: In this study, a diesel-like biofuel was successfully produced from palm oil through two reactions stages under high pressure conditions. Pre-hydrogenation reaction enabled higher conversion and yield, reducing the amount of deoxygenation catalyst needed. Aside from decarboxylation route, decarbonylation and hydrodeoxygenation routes also contributed to the product yield.
Article
Green & Sustainable Science & Technology
Sandra Cardona, Laura M. Orozco, Claudia L. Gomez, Wilson A. Solis, Jorge A. Velasquez, Luis Alberto Rios
Summary: The air-gasification of banana empty fruit bunches was evaluated in a laboratory scale gasifier, and a conceptual design for integrating drying, gasification, and electricity production was proposed. Gasification at 800 degrees Celsius and ER = 0.3 allowed the production of a fuel gas with a HHV of 6.22 MJ/Nm(3), which could be used to generate 1.1 kWh/kg of electricity.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Biotechnology & Applied Microbiology
Juan Martin Delgado Naranjo, Maria Jose Jimenez Callejon, Mariana Penuela Vasquez, Luis Alberto Rios, Alfonso Robles Medina
Summary: The study successfully produced structured triacylglycerols (STAGs) with caprylic acid and DHA located at different positions on the glycerol molecule through enzymatic catalysis, replacing traditional fish oil as a better source of DHA for human consumption.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Energy & Fuels
Alejandra M. Miranda, David Ocampo, Gabriel J. Vargas, Luis A. Rios, Alex A. Saez
Summary: The study focused on the effect of nitrogen levels on the biomass of Scenedesmus obliquus and the resulting biocrude produced after hydrothermal liquefaction. The results indicated that increasing nitrogen source in the culture medium led to higher nitrogen content in the biomass and biocrude. By establishing an optimal concentration of nitrogen source, it was possible to enhance lipid accumulation, reduce protein content, and maintain production and yield of biocrude, which is crucial for evaluating the viability of the process.
Article
Polymer Science
David A. Echeverri, Helen C. Inciarte, Claudia L. Gomez, Luis A. Rios
Summary: The study focused on reinforcing unsaturated polyester-like resins based on modified castor oil with glass fiber to improve mechanical properties. Addition of 20-40 wt% glass fiber enhanced flexural properties and impact properties of the composites. Copolymer composites with styrene showed better adhesion between fibers and matrix compared to homopolymer composites.
IRANIAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Natalia Cortes, David A. Echeverri, Jhonny F. Gomez, Luis A. Rios
Summary: A new bifunctional biobased molecule, CME-RAM, was synthesized from castor oil and CO2. It has carbonate and maleate functionalities that can participate in different reactions, leading to a rigid polyurethane material with a high percentage of green components.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Applied
Laura M. Orozco, Sandra Cardona, Claudia Gomez, Helen Inciarte, Yurany Villada, Luis Rios
Summary: This study suggests using KHSO4 as a re-usable catalyst in the dehydration of castor oil, which offers desired yields, easy separation, and low environmental impact. The catalyst showed good stability in five consecutive experiments. Partial transformation of KHSO4 into K2SO4 and K2S2O7 during the reaction led to a decrease in acidity.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Engineering, Chemical
Laura M. Orozco, Fernando Cardeno, David A. Echeverri, Luis A. Rios
Summary: Biofuels have emerged as alternative options for reducing CO2 emissions. The use of bio-syngas obtained from palm empty fruit bunches in the hydrotreating of palm oil has shown similar results in oil conversion and renewable diesel purity compared to using pure H-2. The presence of CO in bio-syngas can be overcome by regenerating the catalyst or converting CO into CO2 and H-2 through the water-gas shift reaction. This eliminates the need for an expensive H-2 purification process.
CHEMICAL ENGINEERING & TECHNOLOGY
(2022)
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)