Article
Chemistry, Physical
Asif Hussain Khoja, Ahad Hussain Javed, Salman Raza Naqvi, Sehar Shakir, Israf Ud Din, Zafar Arshad, Umer Rashid, Umair Yaqub Qazi, Nida Naeem
Summary: CaO decorated TiO2 catalysts were synthesized using the sol-gel method and exhibited excellent performance in the partial oxidation of methane experiment. The methane conversion rates of the catalysts loaded with 2% and 3% CaO reached 83.6% and 79.5% respectively, and the H-2/CO ratios were slightly higher than the theoretical value.
Article
Engineering, Environmental
Zhihao Zhou, Guoshu Deng, Lin Li, Xue Liu, Zhenkun Sun, Lunbo Duan
Summary: Chemical looping reforming of CH4 (CH4-CLR) is a safe and efficient technology for syngas production, with Fe2O3-based oxygen carriers (OCs) showing potential for high syngas selectivity despite CO2 inhibition. Introducing Fe2O3/Al2O3 pellets as OCs and catalysts in a fluidized-bed reactor helps eliminate the CO2 inhibition effect, converting both CO2 and CH4 into syngas while demonstrating good stability in cyclic tests. This suggests the practical potential of this OC/catalyst pair.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Applied
Pedro Nothaft Romano, Jose Faustino Souza de Carvalho Filho, Joao Monnerat Araujo Ribeiro de Almeida, Eduardo Falabella Sousa-Aguiar
Summary: A series of mono and bimetallic catalysts based on Ni, Rh, and Pd supported on different materials were evaluated for the dry reforming of methane reaction. Ni-based catalysts suffered from deactivation but could be regenerated, while Pd-based catalysts deactivated due to coke deposition. Rh-based catalysts showed remarkable activity and stability.
Article
Chemistry, Physical
Thanh Son Phan, Doan Pham Minh
Summary: Dry reforming of methane (DRM) is a promising process for producing synthetic gas, and the design of an effective catalyst is crucial. In this study, nickel catalysts supported by calcium hydroxyapatite (HAP) and HAP-doped magnesium (Mg_HAP) were synthesized and evaluated in the DRM reaction. The Ni/HAP and Ni/Mg_HAP catalysts showed outstanding performance due to the tunable acidity-basicity of the supports, strong metal-support interaction, and good thermal stability of nickel nanoparticles. The main products were H2 and CO, with stable selectivity around 85%, while H2O and solid carbon were byproducts with 5-10% selectivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Nassim Bouchoul, Houcine Touati, Elodie Fourre, Jean-Marc Clacens, Catherine Batiot-Dupeyrat
Summary: The study investigated the transformation of methane and carbon dioxide by coupling plasma and catalysis using a fluidized bed reactor. It was found that there is a correlation between the surface area of alumina and reactant conversion, with the highest surface area alumina achieving the best conversions in the plasma-fluidized bed. This indicates that an efficient coupling of plasma and catalysis can be achieved with solid particles moving in the gas flow.
Article
Chemistry, Multidisciplinary
Hong Huang, Remzi Can Samsun, Ralf Peters, Detlef Stolten
Summary: The study develops a membrane reactor concept using a ceramic-carbonate dual-phase membrane for integrated CO2 capture and conversion, achieving high CO2 capture rates and conversions through increasing membrane permeation flux and reactor design.
REACTION CHEMISTRY & ENGINEERING
(2022)
Article
Energy & Fuels
Arslan Mazhar, Asif Hussain Khoja, Abul Kalam Azad, Faisal Mushtaq, Salman Raza Naqvi, Sehar Shakir, Muhammad Hassan, Rabia Liaquat, Mustafa Anwar
Summary: Co/TiO2-MgAl2O4 composite showed excellent catalytic activity in the dry reforming of methane process, with the 5%Co loading exhibiting the best performance. The catalyst significantly improved the conversion rates of CH4 and CO2, as well as the selectivity of H-2 and CO. In stability tests, the catalyst demonstrated lasting activity for up to 75 hours, indicating potential for long-term use in the dry reforming process.
Article
Energy & Fuels
Andre Bolt, Ibrahim Dincer, Martin Agelin-Chaab
Summary: New designs of helical methane/natural gas reactors are proposed in this study, which utilize the Sabatier reaction for renewable production of methane. The study develops three models with different diameters and the same volume, and suggests optimizing the reactor design by varying specific parameters. The reactor model with a diameter of 0.0381 m achieves a reactant conversion of 75% and a yield of 87%, while the model with a cross-sectional diameter of 0.0254 m demonstrates the most effective cooling at a coolant temperature of 200 degrees C.
Article
Engineering, Multidisciplinary
Salma A. Al-Zahrani, Ahmed S. Al-Fatesh, Marie-Nour Kaydouh, Ahmed Al Otaibi, Frusteri Francesco, Anis H. Fakeeha, Nissrine El Hassan
Summary: The promotional effect of cesium on yttria-zirconia-supported nickel catalysts in dry reforming of methane is studied for the first time. It is found that an appropriate amount of cesium can improve the carbon resistance of the catalysts, but excessive cesium reduces the catalytic performance. The optimum loading of cesium is determined to be 0.5-1.0 wt%.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Rukan Can Seyfeli, Dilek Varisli
Summary: The study found that Ni@Alumina catalyst has higher production rate and conversion rate for ammonia decomposition reaction in microwave reactor system, while performing poorly under conventional conditions. Selective heating of nickel species in Ni@Alumina enables better performance in the microwave reactor. The formation of hot spots and microwave selective catalytic effect are considered as possible reasons for the improved performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Yahia H. Ahmad, Assem T. Mohamed, Hany A. El-Sayed, Anand Kumar, Siham Y. Al-Qaradawi
Summary: Fine-tuning of materials properties, especially catalytic properties, through innovative synthesis procedures has attracted significant research interest. This study investigates the impact of different synthesis methods on the catalytic performance of Ni/La2O3 catalysts for dry reforming of methane. The results demonstrate that the chosen synthesis techniques significantly affect the morphology, metal support interaction, and surface area of the catalysts, leading to variation in their performance for dry reforming.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Yvan J. O. Asencios, Cristiane B. Rodella, Elisabete M. Assaf
Summary: Catalysts based on Ni/PrO2-ZrO2 mixtures show excellent catalytic performance in various reactions. The PrO2-ZrO2 solid solution as a catalytic support can enhance the production of syngas and reduce carbon deposition. In situ characterization of the catalysts reveals that higher PrO2 content helps optimize the catalyst structure and improve activity and stability.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Green & Sustainable Science & Technology
Birgitta Narindri Rara Winayu, Chun-Ta Li, Hsin Chu
Summary: Calcined ilmenite was used as an oxygen carrier in chemical looping combustion (CLC) and achieved high conversion rates. Increasing syngas concentration, operating temperature, and superficial velocity improved the reaction rate and oxygen carrier utilization, but the application of CO and CH4 caused carbon deposition and surface blocking. High redox cycles had a negative effect on the performance of the oxygen carrier.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Vivian Vazquez Thyssen, Ananda Vallezi Paladino Lino, Jose Mansur Assaf, Elisabete Moreira Assaf
Summary: Ni/La2O3-alpha Al2O3 catalysts were prepared and characterized for methane tri-reforming reaction. The addition of La2O3 increased the dispersion of Ni in the catalysts, leading to higher selectivity towards H-2 production and resistance to carbon deposition on the catalyst surface. However, there was a threshold limit for the La2O3 content, above which the beneficial effects on the reforming process were no longer observed. The N2.5L alpha A catalyst showed the highest selectivity towards H-2 and the lowest carbon deposition rate.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Haiming Gu, Xiaobo Cui, Jianqiang Wang, Wanqi Li, Xuyang Wu, Liang Wang, Shanhui Zhao, Zhenghui Qiao, Miaomiao Niu
Summary: Ce-doped and La-doped iron ore as oxygen carriers showed higher reduction reactivity compared to raw iron ore, promoting H-2 production efficiency. Reasonable doping amounts and temperature can enhance oxygen carrier conversion and stability, leading to increased H-2 yield.
Article
Chemistry, Physical
Ioanna Martinaiou, Alessandro H. A. Monteverde Videla, Natascha Weidler, Markus Kuebler, W. David Z. Wallace, Stephen Paul, Stephan Wagner, Ali Shahraei, Robert W. Stark, Stefania Specchia, Ulrike I. Kramm
APPLIED CATALYSIS B-ENVIRONMENTAL
(2020)
Article
Engineering, Chemical
M. Arsalan Ashraf, Stefano Tacchino, Nageswara Rao Peela, Giuliana Ercolino, Kirandeep K. Gill, Dionisios G. Vlachos, Stefania Specchia
Summary: The study developed a catalytic plate reactor for coupling methane combustion and methane steam reforming, with higher CH4 conversion rate in cocurrent mode but higher energy input in the combustor. Flashbacks were observed in counter-current mode.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Review
Chemistry, Physical
Stefania Specchia, Plamen Atanassov, Jose H. Zagal
Summary: The study highlights the increasing interest in platinum group metal-free electrocatalysts, particularly transition metal-nitrogen-carbon catalysts, as cheap alternatives to Pt-based catalysts for oxygen reduction. Unified activity-stability correlations are crucial for practical guidelines in rational catalyst design. Characterization techniques for studying activity descriptors, such as active site density and turnover frequency, are discussed in relation to the morphology of these electrocatalysts.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Review
Chemistry, Physical
Jose H. Zagal, Stefania Specchia, Plamen Atanassov
Summary: This paper provides an overview of the progress in developing platinum group metal-free (PGM-free) electrocatalysts for the oxygen reduction reaction in polymer electrolyte fuel cells, focusing on the most advanced class of transition metal-nitrogen-carbon ORR catalysts with high activity and long-term durability.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Engineering, Environmental
Carmen W. Moncada Quintero, Giuliana Ercolino, Abhinav Poozhikunnath, Radenka Maric, Stefania Specchia
Summary: This study investigated the effect of coated ceramic open cells foams with catalysts on the combustion reaction of methane, revealing the importance of thermal conductivity of OCFs on reaction performance. The best OCF structured catalyst showed good stability, capable of sustaining the combustion reaction effectively.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Carmen W. Moncada Quintero, Giuliana Ercolino, Stefania Specchia
Summary: In this study, kinetic and mass transfer resistances were evaluated by varying the Co3O4 amount in the catalyst supported on the zirconia open cell foam, and the catalytic performance for methane combustion in lean conditions was examined. A correlation describing mass transfer in zirconia open cell foams at low Reynolds numbers was derived from the experiments.
Article
Engineering, Environmental
M. E. K. Fuziki, R. Brackmann, D. T. Dias, A. M. Tusset, S. Specchia, G. G. Lenzi
Summary: The study investigated the application of a magnetic photocatalyst in the removal of selenium contamination from water bodies. Results showed that under specific conditions, the photocatalyst can effectively remove selenium ions from water and be magnetically separated for recycling.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Carmen W. Moncada Quintero, Giuliana Ercolino, Stefania Specchia
Summary: In this study, a combination of silicon carbide and zirconia open cell foams coated with PdO/Co3O4 catalyst were tested for methane oxidation, with the best results achieved when the two supports were used in series with different thermal conductivities. Mass transfer effects, external and internal heat transfer effects were evaluated, and comparisons were made in terms of volumetric heat transfer coefficient and heats of removal/reaction.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Computer Science, Information Systems
Ivonne Angelica Castiblanco Jimenez, Stefano Mauro, Domenico Napoli, Federica Marcolin, Enrico Vezzetti, Maria Camila Rojas Torres, Stefania Specchia, Sandro Moos
Summary: The development of new waste disposal methods is crucial for eco-friendly cities, with waste management being no exception. This research explores a more ecological and sustainable solution for infectious waste treatment in Northern Italy, aiming to improve the population's quality of life. By utilizing Design Thinking, feasible results based on user needs can be obtained, contributing to the creation of better cities for all.
Article
Electrochemistry
Stefano Zago, Mattia Bartoli, Mohsin Muhyuddin, Giovanni M. Vanacore, Pravin Jagdale, Alberto Tagliaferro, Carlo Santoro, Stefania Specchia
Summary: PGM-free electrocatalysts for ORR were successfully synthesized using ball milling. These Fe-N-C electrocatalysts showed promising activity and stability in alkaline environment, surpassing the commercial Pt/C electrocatalyst.
ELECTROCHIMICA ACTA
(2022)
Article
Electrochemistry
Mohsin Muhyuddin, Davide Testa, Roberto Lorenzi, Giovanni Maria Vanacore, Federico Poli, Francesca Soavi, Stefania Specchia, Walter Giurlani, Massimo Innocenti, Luca Rosi, Carlo Santoro
Summary: The synthesis of Fe-N-C electrocatalyst from carbonaceous char derived from scrap tires was reported. The structural evaluation during each synthesis step was correlated with the ORR activity in different pH conditions. The developed Fe-N-C showed promising ORR activity in acidic, neutral, and alkaline conditions.
ELECTROCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Carmen W. Moncada Quintero, Hernan G. Mazzei, Marion Servel, Frederic Augier, Yacine Haroun, Jean-Francois Joly, Stefania Specchia
Summary: In this study, ceramic open cell foams made of zirconia, silicon carbide, and alumina with different pore densities were characterized using X-ray computed microtomography. Morphological and geometrical characteristics of the foams were comprehensively extracted, and an empirical model was proposed to determine the specific surface area. Lean CH4 combustion tests were performed on coated ceramic foams, and mass transfer coefficients were measured. Finally, the pressure drop across the foams as a function of surface velocity was evaluated and compared with existing experimental data and models.
CHEMICAL ENGINEERING SCIENCE
(2023)
Review
Electrochemistry
Enrico Berretti, Luigi Osmieri, Vincenzo Baglio, Hamish A. Miller, Jonathan Filippi, Francesco Vizza, Monica Santamaria, Stefania Specchia, Carlo Santoro, Alessandro Lavacchi
Summary: In the last two decades, extensive research has been conducted on direct alcohol fuel cells (DAFCs) as potential on-demand power sources. Two leading technologies, proton exchange membranes (PEMs) and anion exchange membranes (AEMs), have emerged for acidic and alkaline DAFCs respectively. This review analyzes the current state-of-the-art in acidic and alkaline DAFCs using methanol and ethanol as fuels, with a focus on the effect of reaction stoichiometry. It highlights the participation of hydroxyl ions (OH-) and the presence of anions as alcohol oxidation products in alkaline systems, which are important considerations for fuel design and energy evaluation from a whole system perspective.
ELECTROCHEMICAL ENERGY REVIEWS
(2023)
Review
Engineering, Environmental
Hernan G. Mazzei, Stefania Specchia
Summary: There is an increasing concern about the treatment of solid medical waste due to the rise in waste generation caused by the pandemic. This paper analyzes the various existing technologies and developments in medical waste management. It also discusses waste-to-energy alternatives and provides tools and criteria for technology selection and economic analysis. It serves as a theoretical guide for decision-making and highlights the limitations in the current system, calling for future research.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Leila Karam, Arianna Miglio, Stefania Specchia, Nissrine El Hassan, Pascale Massiani, Julien Reboul
Summary: This study utilized an environmentally friendly method to convert plastic waste-derived polyethylene terephthalate (PET) into a catalyst made of Ni-0 nanoparticles, demonstrating excellent catalytic performance and stability in the dry reforming of methane reaction. The catalyst showed high catalytic activity, stability, and selectivity, highlighting the potential of using waste materials for the preparation of efficient porous nickel-alumina catalysts.
MATERIALS ADVANCES
(2021)
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.