Article
Green & Sustainable Science & Technology
Gabriela E. Mijangos, Cristina Cuautli, Issis C. Romero-Ibarra, Jorge Vazquez-Arenas, Carlos E. Santolalla-Vargas, Victor Santes, Adrian A. Castaneda-Galvan, Heriberto Pfeiffer
Summary: This study analyzes the influence of sodium and lithium content in the metasilicate crystal structure on the heterogeneous transesterification reaction for biodiesel production. The results show that sodium metasilicate possesses better stability and reutilization capacity compared to lithium metasilicate. DFT calculations reveal significant differences between these two catalysts.
Article
Chemistry, Physical
Pawel Mierczynski, Magdalena Mosinska, Lukasz Szkudlarek, Karolina Chalupka, Misa Tatsuzawa, Marwa Al Maskari, Waldemar Maniukiewicz, Satriyo K. Wahono, Krasimir Vasilev, Malgorzata I. Szynkowska-Jozwik
Summary: Biodiesel production from rapeseed oil and methanol using various monometallic catalysts supported on natural zeolite was investigated. Highest activity and methyl ester yields were observed with Pt/NZ catalyst, suggesting noble metals improve reactivity properties. Increasing metal loading from 0.5 to 2 wt.% enhanced catalytic performance.
Review
Chemistry, Multidisciplinary
Atal Shivhare, Abhinav Kumar, Rajendra Srivastava
Summary: This review article discusses the need for alternative and green energy sources to replace depleting fossil fuels, and how lignocellulose biomass can be transformed into value-added chemicals and biofuels. The focus is on the application of metal phosphate catalysts in biomass upgrading processes.
Article
Energy & Fuels
David Chaos-Hernandez, Hilda Elizabeth Reynel-Avila, Didilia Ileana Mendoza-Castillo, Adrian Bonilla-Petriciolet, Ismael Alejandro Aguayo-Villarreal
Summary: This study optimized the pyrolysis, functionalization, and activation of coconut endocarp-based catalysts for transesterification to produce FAME. Results showed that thermal activation improved catalyst properties, leading to high FAME formation. Physicochemical characterization explained the performance of these catalysts, suggesting their potential as a low-cost alternative for biodiesel production.
Article
Biotechnology & Applied Microbiology
Govindan Rajivgandhi, Govindan Ramachandran, Chenthis Kanisha Chelliah, Muthuchamy Maruthupandy, Franck Quero, S. Vijayalakshmi, Fahd A. AL-Mekhlafi, Muhammad A. Wadaan, J. Ranjitha, Wen-Jun Li
Summary: This study primarily focused on isolating Chlorella vulgaris from industrial wastewater and utilizing it for renewable biodiesel production. By optimizing the reaction parameters, a high yield of C. vulgaris biodiesel was obtained. The study also found that the catalyst used in the process exhibited efficient conversion efficiency for multiple cycles.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Review
Energy & Fuels
M. Mulyatun, Jedy Prameswari, I. Istadi, W. Widayat
Summary: Research on biodiesel production utilizing heterogeneous catalysts focuses on improving production quality and sustainability, with non-food feedstocks and acid-base bifunctional catalysts considered as important factors that can significantly reduce production costs by 60-70%.
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
Engineering, Environmental
Muhammad Ikhsan Taipabu, Karthickeyan Viswanathan, Wei Wu, Zoltan K. Nagy
Summary: Fats, oils, and grease (FOG) waste collected from kitchen and restaurant wastes can cause sewer blockage in many countries due to increased human activities. A new FOG waste-to-chemicals process has been developed to produce biodiesel and other by-products, demonstrating environmental benefits.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
R. F. Botti, M. D. M. Innocentini, T. A. Faleiros, M. F. Mello, D. L. Flumignan, L. K. Santos, G. Franchin, P. Colombo
Summary: In this study, non-stochastic (lattice) scaffolds were successfully manufactured using Direct Ink Writing for catalytic fluid flow applications. Three different geopolymer compositions were tested for ink rheology and printed into lattices for catalytic reactions in biodiesel processing. High catalytic activity and biodiesel yield were achieved for the fabricated lattices with different sodium, potassium or mixed compositions.
APPLIED MATERIALS TODAY
(2021)
Article
Thermodynamics
Allan Almeida Albuquerque, Flora T. T. Ng, Leandro Danielski, Luiz Stragevitch
Summary: Three solid acid-catalyzed processes for biodiesel production were designed and optimized, with processes A and B found to be the most economically and environmentally friendly options. Process A, with a simpler flowsheet, was identified as the best choice compared to process B.
Article
Energy & Fuels
M. Matbouei, D. P. Weston, Xingzhong Liang, S. Hainsworth
Summary: Biodiesel is increasingly used in engine applications to reduce harmful emissions, but it is more corrosive to metallic components compared to petroleum diesel. This study found that corrosion rates were significantly faster for copper and brass compared to mild steel and aluminum alloys, with copper causing chain scission and greater biodiesel degradation. Activation energies for corrosion were also calculated for different metals, showing a direct reaction between copper and fatty acids leading to faster corrosion rates.
Review
Energy & Fuels
Carsten Wedler, J. P. Martin Trusler
Summary: Biodiesel fuels are comprised of a mixture of different fatty acid esters, which have significant effects on combustion and storage. This study reviews the available experimental data on density and viscosity of fatty acid methyl, ethyl, and butyl esters and identifies gaps in the literature. The research includes 16 different esters from three ester families and provides an overview of generalized models for describing density and viscosity at elevated pressures.
Review
Energy & Fuels
Indira Tobio-Perez, Yosvany Diaz Dominguez, Lizet Rodriguez Machin, Sven Pohl, Magin Lapuerta, Ramon Piloto-Rodriguez
Summary: Biodiesel production has increasingly shifted towards using heterogeneous catalysts derived from biomass, due to their sustainability, economical and eco-friendly nature, ease of recovery, and the potential to eliminate biomass residues. The review discusses various biomass sources as precursors for heterogeneous catalysts, different methods for preparation, their advantages and drawbacks, as well as their performance in biodiesel production. The use of biomass ash or biochar-based catalysts shows promise in biodiesel synthesis, but requires improvements in catalyst load, reaction time, temperature, and methanol-to-oil ratio.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Chemistry, Physical
Somasundaram Chandra Kishore, Suguna Perumal, Raji Atchudan, Ashok K. K. Sundramoorthy, Muthulakshmi Alagan, Sambasivam Sangaraju, Yong Rok Lee
Summary: The scientific community is exploring alternative renewable fuels like biodiesel due to the high price of petroleum and increased demand for petroleum-derived products. Transesterification, a technique for creating biodiesel, utilizes a variety of oils and fats, with the choice of catalyst determined by the free fatty acid content in the oil. Heterogeneous catalysts, obtained from biomass and biowaste resources, have solved the issues associated with homogeneous catalysts and have been used to produce high-quality biodiesel efficiently.
Article
Chemistry, Applied
Kuen-Song Lin, Ndumiso Vukile Mdlovu, Ho-Yang Chan, Kevin Chia-Wen Wu, Jeffrey Chi-Sheng Wu, Yu-Tzu Huang
Summary: The hydrophobic and spherical PDVB-x-MeCN catalyst with high contact angles (> 124.0°) was synthesized and was found to be most effective for the removal of free fatty acids (FFA) and production of biodiesel. The FFA removal and biodiesel yield reached 83.2% and 83.3%, respectively, after a 6-hour transesterificationesterification process using PDVB-0.5-MeCN as catalyst.
Article
Chemistry, Physical
Ana Paula Soares Dias, Frederico Gomes Fonseca, Monica Catarino, Joao Gomes
Summary: The study focused on glycerin acetylation reaction using heterogeneous acid catalysts at 120 degrees C, showing the importance of catalyst stability, acidity, and porosity on product selectivity and yield.
Article
Chemistry, Physical
Golshid Hasrack, Maria Carmen Bacariza, Carlos Henriques, Patrick Da Costa
Summary: In recent years, carbon dioxide hydrogenation has been proposed as a promising technology for stabilizing anthropogenic greenhouse gas emissions by producing synthetic fuels and value-added molecules. This study investigated the effects of cobalt promotion on thermal CO2 methanation and non-thermal plasma (NTP)-assisted CO2 methanation using 15Ni/CeO2 catalysts with 1% and 5% cobalt. The promotion effect of cobalt was observed in both plasma and thermal reactions and was mainly attributed to the basic properties of the materials.
Article
Thermodynamics
Bruna Rijo, Ana Paula Soares Dias, Marta Ramos, Marcelo Ameixa
Summary: Harvesting forest residual biomass helps regulate wildfires in hot and dry seasons. Converting collected biomass into liquid biofuel through pyrolysis can avoid biomass transportation fees and efficiently manage forest residues. Catalytic pyrolysis improves the quality and yield of bio-oil.
Article
Engineering, Chemical
Carmen Bacariza, Leila Karam, Nissrine El Hassan, Jose M. Lopes, Carlos Henriques
Summary: This study analyzed the effects of nickel loading, Si/Al ratio, and framework type on catalyst performance. Increasing nickel loading improved conversion rates but decreased stability. Si/Al ratio and zeolite type also had significant impacts on catalytic performance.
Article
Polymer Science
Mateus Hofmann, Mario Garrido, Marina Machado, Joao R. Correia, Joao C. Bordado
Summary: Research on biobased thermoset resins has been overlooked compared to biobased thermoplastics. This study developed low-molecular weight macromolecules with a high bio-content, suitable for various fiber-reinforced polymer production techniques. The resulting resins exhibited comparable mechanical and thermomechanical behavior to petrochemical-based counterparts, making them greener alternatives for high-performance structural applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Business
Maria Margarida Mateus, Duarte Cecilio, M. Cristina Fernandes, M. Joana Neiva Correia
Summary: The production of Refused Derived Fuel (RDF) from Municipal Solid Waste is a route to achieve a circular economy and reduce greenhouse gas emissions. However, there are technological constraints related to moisture content and granulometry in RDF production.
BUSINESS STRATEGY AND THE ENVIRONMENT
(2023)
Article
Chemistry, Physical
Ana Paula Soares Dias, Bruna Rijo, Alain Kiennemann, Manuel Farinha Portela
Summary: The kinetics of methanol to formaldehyde oxidation over iron molybdates catalysts was investigated. Data was obtained under integral reactor conditions and rates of products formation were calculated by differentiating experimental data yield with contact time. Catalytic tests were conducted on stoichiometric (Mo/Fe=1.5) and Mo rich (Mo/Fe=3) catalysts prepared using coprecipitation and sol-gel techniques. The Mo/Fe atomic ratio of the catalysts had no effect on the methanol to formaldehyde kinetics, indicating that the Fe2(MoO4)3 phase was the active phase of the catalysts. Although a direct correlation between CO formation and the Mo/Fe atomic ratio could not be inferred due to the different reduction degrees of the catalysts (Fe2+/Fe3+), the Mo/Fe ratio played a crucial role in the consecutive oxidation of formaldehyde to CO, thus controlling the catalyst selectivity.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Energy & Fuels
Filipe Mateus, Paula Teixeira, Joseï M. Lopes, Carlos Henriques, Carmen Bacariza
Summary: Activated carbons derived from cork wastes were used as supports for CO2 methanation catalysts for the first time. The addition of CeO2 improved the catalytic performance of the Ni-based catalysts, showing higher CH4 yields compared to the catalyst without CeO2.
Article
Chemistry, Physical
Octavian Dumitru Pavel, Alexandra-Elisabeta Stamate, Rodica Zavoianu, Anca Cruceanu, Alina Tirsoaga, Ruxandra Birjega, Ioana Andreea Brezestean, Alexandra Ciorita, Daniela Cristina Culita, Ana Paula Soares Dias
Summary: This paper focuses on the use of hybrid catalysts (Mo-LDH-GO composites) for the removal of indigo carmine dye (IC) from wastewater using environmentally friendly H2O2 as the oxidation agent. The catalysts were characterized and the most efficient catalyst was found to be the one with 20%wt. GO, achieving a removal rate of 96.6% for IC. The results suggest a strong correlation between catalytic activity, textural properties, and basicity of the catalysts.
Article
Chemistry, Physical
Domenico Aceto, Maria Carmen Bacariza, Arnaud Travert, Carlos Henriques, Federico Azzolina-Jury
Summary: In this study, a Ru-based zeolite catalyst was synthesized and characterized, and its performance under thermal and plasma-assisted CO2 methanation conditions was investigated. The results showed that under plasma-catalytic conditions, CO2 was more easily adsorbed on the catalyst surface and hydrogenated to methane.
Article
Green & Sustainable Science & Technology
Bruna Rijo, Ana Paula Soares Dias, Joao Pedro Santos Carvalho
Summary: Aircraft industries generate large quantities of carbon fiber reinforced polymers that need to be recycled for circular economy compliance. The recovery of carbon fiber reinforced epoxy resin composites from the aircraft construction industry was studied using nitric acid-catalyzed hydrolysis. The research showed that the UVB irradiation induced polymer degradation and was beneficial for the recycling process, but it also caused some damage to the carbon fibers.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Review
Environmental Sciences
Ana Paula Soares Dias, Bruna Rijo, Francisco Santos, Rui Galhano dos Santos, Tania Frade
Summary: At COP27, policy makers set a goal of limiting global warming to 1.5 degrees C above the pre-industrial level. To achieve this, replacing fossil derivatives with biomass derivatives is essential. Blue carbon from marine macroalgae can contribute significantly to the mitigation of carbon emissions, and seaweed is a suitable raw material for biorefineries due to its high growth rates and no need for fresh water or arable land.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Construction & Building Technology
M. I. Romero-Gomez, M. F. Costa-Pereira, A. P. Soares Dias, I. Flores-Colen
Summary: Gypsum plasters are versatile materials with various properties. This study evaluates the impact of high temperature exposure on gypsum composites containing plastic waste. The study finds that the nature of the gypsum matrix remains largely unchanged after adding plastic waste but the low cohesion degree of the interface transition zone is a critical feature. Additionally, adding PA6 fibers improves the cracking performance after exposure to fire temperature.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Environmental Sciences
Bruna Rijo, Ana Paula Soares Dias, Nicole de Jesus, Manuel Francisco Pereira
Summary: With the increase in population, a considerable amount of food waste is generated globally every day. Researchers have found that this waste can be used as a source for renewable fuels through low-temperature catalytic pyrolysis of biomass from household garbage. The results show that various organic waste materials can be converted into valuable products such as bio-oil using this pyrolysis technique.
Article
Engineering, Environmental
Bruna Rijo, Ana Paula Soares Dias, Lukasz Wojnicki
Summary: A large volume of scrap tires are produced worldwide daily, and landfill is an ineffective method of disposal. Pyrolysis can convert tire rubber into energy, allowing for waste management in a circular economy. The use of alkali carbonates as catalysts in pyrolysis tests improves the thermal degradation rate and can tailor the distribution of pyrolysis products.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
