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SSRN 2024年

作者： Figueiredo, Anabela Soria, Miguel Angel Madeira, Luís Miguel da Silva Rocha, Cláudio LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias s/n Porto4200-465 Portugal ALiCE - Associate Laboratory in Chemical Engineering Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias s/n Porto4200-465 Portugal

As global population and economies continue to grow significantly, the most practical method of lowering such emissions is to capture CO2. Although other technologies are more developed, adsorption is very promising and has attracted much *** new hydrotalcites (HTs) with different initial concentrations of ion precursors were prepared for the first time by the co-precipitation method - it was possible to verify that the ion concentrations influence the characteristics of the materials. The prepared HTs were characterized by TG, XRD, surface area measurements and TPD-CO2 to relate their CO2 capture capacity to their physicochemical properties;the CO2 adsorption equilibrium isotherms were determined at 35 and 300 ºC for the prepared samples, as well as for some commercial materials. After determining which materials present the best CO2 adsorption capacity, these were submitted to adsorption-desorption cycles to study their *** was possible to conclude that the Zeolite 13X showed the best capacity at 35 ºC, 3.38 mmol·g-1 (@[[EQUATION]]= 1 bar) and a prepared calcined HT (c-HT2) at 300 ºC, 0.97 mmol·g-1 (@[[EQUATION]]= 1 bar). Moreover, there is an optimum initial concentration of the ions’ solutions for the tested HTs, which depends on the final application – c-HT1 showed a better capacity at 35 ºC and c-HT2 at 300 ºC. From the adsorption-desorption cycles at 1 bar of CO2 partial pressure, a working cyclic capacity of 2.69 mmol∙g-1 was achieved by the Zeolite at 35 ºC;in turn, c-HT2 showed a working cyclic capacity of 0.79 mmol∙g-1 at 300 ºC. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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Preparation and Characterization of Materials for Low- to Intermediate-Temperature CO2 Adsorption

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SSRN 2024年

作者： Figueiredo, Anabela Soria, Miguel Angel Madeira, Luís Miguel da Silva, Cláudio Rocha LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias s/n Porto4200-465 Portugal ALiCE - Associate Laboratory in Chemical Engineering Department of Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias s/n Porto4200-465 Portugal

Global carbon dioxide emissions are rising and the use of fossil fuels in several sectors are the leading causes. As global population and economies continue to grow significantly, the most practical method of lowering such emissions is to capture CO2. Although other technologies are more developed, adsorption is very promising and has attracted much attention. To ensure this technology's success, it is essential to have suitable CO2 adsorbent materials. In this work, several new hydrotalcites (HTs) with different initial concentrations of ion precursors were prepared for the first time by the co-precipitation method - it was possible to verify that the ion concentrations influence the characteristics of the materials. The prepared HTs were characterized by thermogravimetric analysis (TG), X-Ray diffraction (XRD), surface area measurements and temperature-programmed desorption of CO2 (TPD-CO2) to relate their CO2 capture capacity to their physicochemical properties;the CO2 adsorption equilibrium isotherms were determined at 35 and 300 ºC for the prepared samples, as well as for some commercial materials: magnesium oxide, calcium oxide, aluminium oxide and Zeolite 13X. After determining which materials present the best CO2 adsorption capacity, these were submitted to adsorption-desorption cycles to study their stability. The main objective of the work was to prepare and study different CO2 adsorbents for processes that are carried out at low and intermediate temperatures. From the experimental results, it was possible to conclude that the Zeolite 13X showed the best capacity at 35 ºC, 3.38 mmol·g-1 (@ pCO2= 1 bar) and a prepared calcined HT (c-HT2) at 300 ºC, 0.97 mmol·g-1 (@ pCO2= 1 bar). Moreover, it seems there is an optimum initial concentration of the ions’ solutions for the tested HTs, which depends on the final application – c-HT1 showed a better capacity at 35 ºC and c-HT2 at 300 ºC. From the adsorption-desorption cycles at 1 bar of CO2 partial pressure, a wo

关键词： Carbon dioxide

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Regeneration of Methane Splitting Catalysts by Interfacial Hydrogenation

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SSRN 2024年

作者： Alves, Luís Pereira, Vítor Delgado, Sofia Atashi, Niloufar Dias, Paula Lagarteira, Tiago Prieto, Gonzalo Mendes, Adélio LEPABE - Laboratory for Process Engineering Environmental Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal ALiCE – Associated Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal Av. Los Naranjos s/n Valencia46022 Spain

Methane splitting, also known as decomposition or pyrolysis, has a unique potential to accelerate the transition from the current carbon-based economy towards the foreseen hydrogen economy. Low-temperature catalytic methane splitting systems are unavailable due to fast catalyst deactivation, caused by solid carbon that encapsulates the catalyst. Catalyst regeneration must be performed to reactivate the catalyst and achieve a long-term operational lifetime. This can be accomplished by cyclically refeeding a portion of the produced hydrogen back to the catalyst, which promotes the hydrogenation of carbon atoms, preferentially at the interface between carbon deposits and catalytic nanoparticles. Interfacial hydrogenation ideally breaks the bonds that connect carbon allotrope products to the metal catalyst, causing the former to detach, and freeing the catalytic metal surface for further reaction. In this work, a proof-of-concept of this technology is provided, showing the full regeneration of a bulk-type Ni catalyst during 22 cycles of methane decomposition, at 550 °C and 1 bar. Furthermore, a commercial SiO2-Al2O3-supported Ni catalyst has been used to study the regenerability of a highly active nanostructured material by interfacial hydrogenation. It has been demonstrated that regeneration is beneficial to improve the stability of both systems, at the applied working conditions. Nevertheless, tip-grown carbon nanotubes were considered as a cause of permanent deactivation, which could not be solved by refeeding hydrogen into the system. © 2024, The Authors. All rights reserved.

关键词： Hydrogenation

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The Chemistry Behind Biological Properties of Agro-Industrial Portuguese By-Products: Development of an Hplc-Dad Method for the Quantification of Phenolic Compounds

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SSRN 2023年

作者： Gomes, Sandra M. Ferreira, Sara M. Santos, Lúcia LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal ALiCE - Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal

The growing food production and processing, necessary to overcome the increase in the world population observed in the last decades, generates great amounts of food waste, which creates environmental, economical and social problems. These residues include fruit and vegetable by-products such as chestnut shells, grape seeds, onion peels and passion fruit peels. These are rich in bioactive compounds, namely phenolic compounds, that present numerous biological activities. Therefore, the by-products can be valorised by their incorporation in food or cosmetic products, taking advantage of their interesting properties and contributing to a circular economy model. In this work, an HPLC-DAD method was developed to identify and quantify the main compounds present in phenolic-rich extracts from chestnut shells, grape seeds, onion peels and passion fruit peels. The linearity, sensitivity, precision, robustness and accuracy of the method were analysed and finally, the phenolic compounds were quantified in the different extracts. The results obtained demonstrated that the developed method was suitable for the identification and quantification of nine phenolics (caffeic acid, catechin, chlorogenic acid, epicatechin, gallic acid, kaempferol, quercetin, resveratrol and rosmarinic acid). Also, the extracts analysed presented different phenolic compositions, which may confer different biological properties. © 2023, The Authors. All rights reserved.

关键词： Sustainable development

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Study of furanic compounds sorption behavior in transformers’ insulating materials

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Journal of Molecular Liquids 2025年 428卷

作者： Teixeira, Miguel A.J. Maia, Luanna Matharage, Shanika Y. Wang, Zhongdong Simões, Mário M.Q. Portugal, Inês Silva, Carlos M. CICECO – Aveiro Institute of Materials Department of Chemistry University of Aveiro Aveiro3810-193 Portugal LEPABE – Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Porto4200-465 Portugal ALiCE– Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Porto4200-465 Portugal Department of Electrical and Electronic Engineering University of Manchester ManchesterM13 9PL United Kingdom LAQV-REQUIMTE Department of Chemistry University of Aveiro Aveiro3810-193 Portugal

Deterioration of electric transformers’ insulating systems can be monitored using specific markers, such as furanic compounds formed by degradation of cellulosic materials (insulating paper) impregnated with mineral oil. However, the presence of these markers in the insulating oil can be masked by their adsorption on paper, which may occur during aging tests and/or the preparation of aged oil samples for analysis. Hence, it is important to assess the partitioning of aging markers in insulating systems comprising mineral oil and paper. In this work, furfural (FAL) and furfuryl alcohol (FOL) were chosen as degradation markers to study adsorption equilibrium and kinetics of furanic compounds in oil-paper systems, at 30 °C. Two insulating papers were tested, using distinct initial moisture content and FAL/FOL mass ratio. Overall, the results showed that the partition of FAL and FOL in the oil-paper systems is influenced by the solute's molecular structure, by the morphological surface of the paper, and by its moisture content. In the range 3.2 wt.% to 8.7 wt.% H2O, when the paper moisture content increases the concentration of furanic compounds in the oil is lower which means the furanic compounds migrate to the paper. Single and multicomponent equilibrium adsorption data were successfully fitted to a linear isotherm equation and kinetic data were fitted to pseudo-first and pseudo-second order models. These models are useful to plan the analysis of degradation markers in oil-paper insulating systems of electric transformers, which should consider their partition in both phases. © 2025 The Authors

关键词： Furfural

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Evaluation of the Conversion Potential of Maize Stover from Soil Phytoremediation to Bioethanol 1

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9th International Conference on Energy and Environment Research, ICEER 2022

作者： Caetano, Nídia S. Santos, Mariana Marques, Ana P. LEPABE—Laboratory for Process Engineering Environment Bio technology and Energy Faculty of Engineering University of Porto R. Dr. Roberto Frias S/N Porto4200-465 Portugal ALiCE—Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal R. Dr. António Bernardino de Almeida 431 Porto4249-015 Portugal CBQF − Centro de Biotecnologia e Química Fina − Laboratório Associado Escola Superior de Biotecnologia Universidade Católica Portuguesa Rua de Diogo Botelho 1327 Porto4169-005 Portugal

ISBN: (数字)9783031435591

ISBN: (纸本)9783031435584

This work aimed to evaluate the conversion potential of maize stover (MS) from phytoremediation of heavy metals contaminated soil to bioethanol. Thus, MS was submitted to an acid pretreatment with 3% (v/v) H2 SO4, HCl, HNO3 or CH3 COOH at 85 °C for 48 h. An enzymatic hydrolysis step with Accellerase or Ultraflo was applied at 50 °C for 13 h. Finally, Saccharomyces cerevisiae was used to ferment the glucose at 37 °C, followed by distillation to recover ethanol. The average yield in ethanol for the MS produced in the two contaminated soils was 0.51 and 0.32 gethanol /gMS for the MS treated with HCl and Accellerase and 0.39 and 0.27 gethanol /gMS for the MS treated with HNO3 and Ultraflo, respectively. For the MS produced in the control soil, the yield was 0.37 and 0.44 gethanol /gMS for the treatment with HNO3 and Ultraflo and HCl and Accellerase, respectively, being the differences in ethanol yield assigned to the different cellulose/hemicellulose content of the MS samples. No metals were detected in the ethanol recovered. This research demonstrated the feasibility of valorization of MS from heavy metals contaminated soil phytoremediation through ethanol production, contributing to a more sustainable process of soil phytoremediation. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Ethanol

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Ni-Based Catalysts Supported on La/Alzn/Alla Oxides for Hydrogen Production Via Glycerol Steam Reforming

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SSRN 2023年

作者： Macedo, M. Salomé Kraleva, Elka Ehrich, Heike Soria, Miguel Angel Madeira, Luis Miguel LEPABE – Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal ALiCE - Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal Albert-Einstein-Str. 29 a RostockD-18059 Germany

The effect of La/AlZn/AlLa oxide supports on Ni-based catalysts performance was assessed for glycerol steam reforming for renewable H2 production. NiAlLaOx showed the best performance providing a glycerol conversion into gaseous products of 91% and H2 yield of 5.40 at 700 °C. Additionally, stability experiments lasting up to 24h were performed at 625 °C, having been observed a stable behavior for NiAlLaOx with low coke formation. The materials physicochemical properties, determined from different techniques (ICP-OES, N2-sorption at - 196 °C, XRD, TEM/EDX, TPR, TPO), allowed to comprehend how these influence their performance and stability. The NiAlLaOx good performance was assigned to the presence of LaAlO3 perovskite, which was more efficient in preventing coke formation and selective towards H2 production. Moreover, the harder reducibility of Ni species present in NiAlLaOx suggested the existence of strong interactions between them and the support, which were also responsible for this sample outstanding performance. © 2023, The Authors. All rights reserved.

关键词： Steam reforming

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CELLULOSE CHEMISTRY AND TECHNOLOGY ENCAPSULATION OF EXTRACTS FROM MIDDLE EAST MEDICINAL PLANTS AND ITS ADVANTAGES-A REVIEW ARTICLE

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Cellulose Chemistry and Technology 2022年第1-2期56卷 1-27页

作者： Fathi, Faezeh Ebrahimi, Samad N. Rocha, Fernando Estevinho, Berta N. Department of Phytochemistry Medicinal Plants and Drugs Research Institute Shahid Beheshti University Iran LEPABE-Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Dr. Roberto Frias Str Porto4200-465 Portugal

Medicinal plants have played an important role in the development of human health care and culture, serving as both medicine and food. Herbal drugs have been used for centuries for the treatment of several diseases and many of the new medicines are produced based on recent research on their traditional uses. Medicinal plants of the Middle East are regarded as a rich resource of different valuable bioactive compounds. Such compounds extracted from natural resources maintain many potential health benefits. The application of bioactive compounds is, however, rather limited in food and drug formulations because of their poor bioavailability, fast release and low solubility. Thus, encapsulation can protect the bioactive compounds from environmental stress, improve their physicochemical functionalities, reduce the potent toxicity of drugs, modify the release of encapsulated active materials, reduce dosage, enhance their health- promoting and anti-disease activities. This review discusses the importance of the pharmaceutical properties of thirty-two species of relevant medicinal plants native to the Middle East and their uses in various industrial applications. © 2022, Publishing House of the Romanian Academy. All rights reserved.

关键词： Biochemistry

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KINETIC CHARACTERIZATION OF Pt/Al2O3 CATALYST FOR HYDROGEN PRODUCTION VIA METHANOL AQUEOUS-PHASE REFORMING 23

KINETIC CHARACTERIZATION OF Pt/Al2O3 CATALYST FOR HYDROGEN P...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Lakhtaria, Paranjeet Ribeirinha, Paulo Sousa, José Mendes, Adélio LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal ALiCE - Associate Laboratory in Chemical Engineering Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal Departamento de Química Escola de Ciências da Vida e do Ambiente Universidade de Trás-os-Montes e Alto Douro Quinta de Prados Vila Real5000-801 Portugal

ISBN: (纸本)9786250008430

Methanol aqueous-phase reforming (APR) is a simpler and more energy-efficient process compared to traditional gas-phase reforming. Methanol APR is considered to be a potential technology for providing in-situ hydrogen (H2) production, mainly for H2-powered fuel cell technology. The performance evaluation of a Pt/Al2O3 catalyst in methanol APR under various operating conditions is reported. Studies were conducted at various temperatures, pressures, methanol concentrations, and residence times to evaluate APR performance. An increase in methanol conversion was observed with increased operating temperature and decreased system pressure. It was also noted that higher methanol concentration in the feed had an adverse effect on APR performance. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Catalysts

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Air Quality Assessment During the Low Emission Zone Implementation in Madrid (Spain)

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SSRN 2023年

作者： Gómez-Losada, Álvaro Pires, José C.M. Universidad Loyola Andalucía Department of Quantitative Methods Avda. de las Universidades s/n Seville Dos Hermanas41704 Spain LEPABE - Laboratory for Process Engineering Environment Biotechnology and Energy Faculty of Engineering University of Porto Rua Dr. Roberto Frias Porto4200-465 Portugal

Low emission zones (LEZ) represents one of the strategies to reduce, or limit, emissions of air pollutants from road traffic within specific spatial areas in cities. This study aims to assess the effectiveness of Madrid LEZ by quantifying the reduction in ambient and background pollution, the latter representative of the pollution to which the population is chronically exposed. The average reduction in the NO2, PM10 and PM2.5 ambient pollution concentration was 12.1 μg·m-3, 5.2 μg·m-3 and 3.4 μg·m-3, respectively. Regarding background pollution, these reductions were 9.6 μg·m-3 for NO2, 0.5 μg·m-3 for PM10, and 1.2 μg·m-3 for PM2.5. Diff-in-Diff analysis compares the changes in outcomes over time between a population enrolled in a program (sites within LEZ zone - treatment group-) and a population that is not (sites outside the LEZ zone - control group). Road traffic contributions were estimated to be reduced by 12.8 μg·m-3 for NO2 and 5.3 μg·m-3 for PM10. Even results have shown that LEZ implementation in Madrid have been effective and represented an improvement in the air quality of the city, it still can be considered insufficient, and further restrictive measures remains to be targeted for its impact on urban health be more pronounced. © 2023, The Authors. All rights reserved.

关键词： Nitrogen oxides

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