Article
Energy & Fuels
Yang Liu, Junjie Liao, Liping Chang, Weiren Bao
Summary: This paper investigates the adsorption performance of silver-modified mesoporous materials in removing thiophenic compounds. The results show that the adsorption of thiophene by the sorbents involves S-Ag and pi complexation reactions, and the adsorption efficiency is greatly affected by benzene. XPS analysis reveals that silver interacts strongly with the carrier and forms Ag-O-Si bonds as the active centers for thiophenic compounds. The Mulliken charges of sulfur atoms have an impact on the interactions between silver and thiophene sulfur compounds.
Article
Green & Sustainable Science & Technology
P. Jain, M. Chimote, C. P. Vinod
Summary: Bimetallic nanoparticles with synergistic effects can enhance the catalytic activity, selectivity, and stability of solid materials. The study synthesized Au@Co core-shell bimetallic nanoparticles and demonstrated efficient and stable CO conversion in the FT reaction.
MATERIALS TODAY SUSTAINABILITY
(2021)
Article
Engineering, Chemical
Dayanne E. F. Oliveira, Jose A. . O. Chagas, Ana Lucia De Lima, Claudio J. A. . Mota
Summary: Chitosan was impregnated on MCM-41 and SBA-15 mesoporous silica supports and tested for CO2 adsorption. The SBA-15 adsorbent impregnated with 50 wt % of chitosan showed the best results, with CO2 uptake of 0.78 mmol g-1.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Agija Stanke, Valdis Kampars
Summary: The transportation sector's significant contribution to greenhouse gas emissions has prompted the search for sustainable and renewable alternatives to fossil fuels. This study focused on the synthesis of mesoporous Fe/SBA-15 catalysts using natural clays as binders and promoters. The results showed that catalysts agglomerated with kaolin exhibited better performance, and catalysts in powdered form had higher CO conversion rates.
Article
Chemistry, Applied
C. F. Toncon-Leal, J. F. Munera, J. J. Arroyo-Gomez, K. Sapag
Summary: Iron, cobalt, and bimetallic catalysts were synthesized and impregnated on mesoporous silica support to study their behavior in Fischer-Tropsch Synthesis. Bimetallic catalysts exhibited higher catalytic activity than monometallic catalysts.
Article
Materials Science, Ceramics
Marilia R. Oliveira, Juan A. Cecilia, Juliana F. De Conto, Silvia M. Egues, Enrique Rodriguez-Castellon
Summary: It is well-known that there is a constant global search for sustainable technologies that can effectively reduce carbon dioxide (CO2) emissions in order to combat climate change. This study focused on the synthesis of silica-based adsorbents, MCM-41 and SBA-15, using a microwave reactor. The results showed that microwave irradiation greatly improved the properties and adsorption capacity of the silica materials, making them promising candidates for CO2 capture processes.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Applied
Prasad Gonugunta, A. Iulian Dugulan, G. Leendert Bezemer, Ekkes Bruck
Summary: Operando spectroscopic techniques were used to investigate the impact of oxygenates deposition on the deactivation of cobalt on titania Fischer-Tropsch catalysts under high pressure. It was found that catalysts prepared via impregnation had more and heavier carboxylates, likely due to higher olefin content in the products, leading to increased formation of oxygenates. Gas chromatography/infrared spectroscopy data indicated that the surface carboxylate species were not involved in catalyst deactivation, serving as spectator species on the titania support.
Article
Chemistry, Physical
Tobias F. Kimpel, Jin-Xun Liu, Wei Chen, Robert Pestman, Emiel J. M. Hensen
Summary: Through IR spectroscopy and DFT calculations, it has been discovered that in the Fischer-Tropsch reaction, Mn promotes a silica-supported Co catalyst with a MnO layer covering the Co surface, activating adsorbed CO through reaction with an oxygen vacancy. This results in higher activity, higher CHx coverage, increased C5+ selectivity, and decreased CH4 selectivity. Increasing pressure amplifies the selectivity differences. However, above around 4 bar, the addition of Mn decreases C5+ selectivity, possibly due to its promotion of C-O bond dissociation but not chain growth. Migration of formed monomers for chain growth on the Co surface may be hindered by high CO coverage, especially at high pressure.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
C. J. (Kees-Jan) Weststrate, Daniel Garcia Rodriguez, Devyani Sharma, J. W. (Hans) Niemantsverdriet
Summary: This study investigates the interaction between hydrogen and cobalt surfaces, revealing the adsorption and desorption behavior of hydrogen on different surface structures. It also discovers the variation of hydrogen adsorption strength and equilibrium constant under different conditions.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
F. Platero, S. Todorova, L. Aoudjera, L. Michelin, B. Lebeau, J. L. Blin, J. P. Holgado, A. Caballero, G. Colon
Summary: In this study, cobalt catalyst supported on mesostructured TiO2 was prepared and subjected to calcination and reduction. The results showed that cobalt nanoparticles were uniformly distributed along the mesopore channels of TiO2, and the highly stable metal active sites contributed to the generation of C5+ products in Fischer-Tropsch synthesis reaction.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Energy & Fuels
Francisco Platero, Alfonso Caballero, Gerardo Colon
Summary: Cobalt supported TiO2 catalysts were prepared by wet-impregnation and by immobilization over APTES grafted TiO2. The impregnated system showed better catalytic performance after reduction at 260 degrees C, but significant deactivation was observed. In contrast, the functionalized catalyst showed better catalytic performance after reduction at 400 degrees C with notable stability. CO-DRIFT operando analysis revealed that the impregnated system was strongly affected by negative SMSI upon reduction at higher temperature, while immobilization on APTES hindered the loss of metal active sites. The study of spent catalysts indicated that Co was redispersed in the impregnated catalyst while functionalized catalyst tended to form agglomerates.
Article
Energy & Fuels
Dalia Liuzzi, Francisco J. Perez-Alonso, Sergio Rojas
Summary: Ru-Co/Al2O3 and Ru-Fe/Al2O3 catalysts prepared by reduction-deposition method exhibit high activity in Fischer-Tropsch Synthesis, showing different conversion rates and product selectivity. The interaction between Ru and Co in Ru-Co/Al2O3 enhances the activity, while Ru-Fe/Al2O3 displays superior initial performance but declines over time, with less enriched products compared to Ru/Al2O3.
Article
Chemistry, Multidisciplinary
Jiun-Horng Tsai, Ting-Yi Lee, Hung-Lung Chiang
Summary: Hexagonal SBA-15 mesoporous material was used as a catalytic template for chemical transformation with Fe, Co, and Ni as catalysts. The impregnation of metal oxides on SBA-15 resulted in a decrease in specific surface area and pore volume. The materials have the potential to be used in pollutant removal, catalytic reactions, and recycling waste into high-value materials.
Article
Energy & Fuels
Pavan Kumar Gupta, Abhishek Mahato, Goutam Kishore Gupta, Gajanan Sahu, Sudip Maity
Summary: This study investigates the catalytic conversion of syngas through Fischer-Tropsch route using two different supported catalysts (MA and SBA-15), and finds that they exhibit different selectivities in product distribution.
OIL & GAS SCIENCE AND TECHNOLOGY-REVUE D IFP ENERGIES NOUVELLES
(2021)
Article
Chemistry, Applied
Christopher M. A. Parlett, Hamidreza Arandiyan, Lee J. Durndell, Mark A. Isaacs, Antonio Torres Lopez, Roong J. Wong, Karen Wilson, Adam F. Lee
Summary: The article demonstrates a method for continuous flow synthesis of SBA-15 at high yield at 80 degrees C using a simple tube reactor. The resulting SBA-15 exhibits excellent textural properties and far higher productivity than previously reported in batch or flow synthesis.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Emerson F. M. da Silva, Erika R. B. Ximenes, Leticia B. de Sales, Erica J. M. Dantas, Evelle D. C. Oliveira, Thiago B. Simoes, Andre T. S. Ribeiro, Oihane Sanz, Giovanna Machado, Luciano C. Almeida
Summary: In this study, a monolithic structured photoreactor with TiO2 immobilized on a high surface area calcined brass was used for the photodegradation of Reactive Black 5 textile dye. The system demonstrated efficient degradation of the dye under specific conditions, showing promise as a feasible alternative for textile effluent treatment.
Article
Energy & Fuels
Emerson F. M. da Silva, Evelle D. C. Oliveira, Andre T. S. Ribeiro, Ramon R. P. Garcia, Daniella C. Napoleao, Oihane Sanz, Luciano C. Almeida
Summary: A photocatalytic structured reactor of calcined brass-mesh monolith immobilized with TiO2 was used for textile dye photodegradation. The effects of feed flow, pH medium, and radiation source on photocatalytic efficiency were investigated. The results showed that flow modification did not significantly affect the degradation of the dye chromophore group, and the use of solar radiation had a positive impact on photocatalytic efficiency. The monolithic system exhibited good stability and high degradation after consecutive cycles of photocatalytic reaction.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Engineering, Chemical
Tiago Jose Marques Fraga, Maryne Patricia da Silva, Eleonora Maria Pereira de Luna Freire, Luciano Costa Almeida, Mauricio Alves da Motta Sobrinho, Marcos Gomes Ghislandi, Marilda Nascimento Carvalho
Summary: Wood from furniture scraps was converted into clean energy through a gasifier. The residual charcoal was used to support the development of an amino-functionalized multilayer graphene oxide composite, which showed excellent adsorption capacity and easy separation for water pollutants. It can be considered as a profitable adsorbent for textile dyes.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Materials Science, Ceramics
M. Rocha, Francisca P. Araujo, S. Castro-Lopes, Idglan S. de Lima, Edson Cavalcanti Silva-Filho, Josy Anteveli Osajima, Carla S. Oliveira, Bartolomeu C. Viana, Luciano C. Almeida, Y. Guerra, R. Pena-Garcia
Summary: In this study, the influence of Fe and Pr addition on the structural, optical, and antibacterial properties of spherical ZnO nanoparticles synthesized via sol gel method was investigated. The lattice constants values increased while the average crystallite size decreased with varying Pr concentration. Raman and FTIR spectroscopies confirmed the single-phase formation of ZnO and the presence of oxygen vacancies. The samples exhibited agglomerated spherical morphology and the textural properties were affected by the inclusion of Fe. The synthesized materials showed promising antimicrobial activity against Escherichia coli and Staphylococcus aureus due to nanomaterial-bacteria interactions.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
M. Goncalves, J. Matilla-Arias, Francisca P. Araujo, Y. Guerra, Bartolomeu C. Viana, Edson C. Silva-Filho, Josy A. Osajima, Luciano C. Almeida, A. Franco Jr, R. Pena-Garcia
Summary: In this study, the structural, optical, and magnetic properties of Y3-xCexFe5-yEry(O12) compound were investigated. The results showed that rare earth dopants influenced the lattice structure and optical properties, with Er3+ having the highest probability of occupying octahedral sites.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
M. Costa-Silva, Francisca P. Araujo, Y. Guerra, Bartolomeu C. Viana, Edson C. Silva-Filho, Josy A. Osajima, Luciano C. Almeida, E. Skovroinski, R. Pena-Garcia
Summary: In this study, Ce-Ni co-doped ZnO nanodisks-like self-assembled structures were synthesized by the sol gel process and their photocatalytic, structural, and optical properties were investigated. The structural parameters were calculated and the changes were discussed in terms of dopants, ionic radii and atomic disorder defects. Fourier Transform Infrared Spectroscopy and Raman spectra confirmed the formation of the hexagonal wurtzite structure. The field-emission scanning electron microscopy images showed the presence of nanodisks-like self-assembled structures, while the surface area increased with the dopant. The optical band gap decreased and Urbach energy increased with the Ni content. Structural defects were identified and quantified by the photoluminescence spectra deconvolution. It was demonstrated that Ni concentration influenced the photocatalytic performance, with samples containing lower Ni concentration showing higher photocatalytic efficiency (81.3%).
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Energy & Fuels
Felipe Chagas, Emerson Felipe M. da Silva, Celmy M. B. M. Barbosa, Luciano C. Almeida
Summary: A structured catalytic cartridge was developed as an alternative to commercial GC methanizers, showing better catalytic activity and methane selectivity. The coating of the catalyst on metal foams of different porosities showed that the structured catalyst with a 60 ppi exhibited better activity compared to commercial catalysts, indicating its potential as a natural substitute for commercial GC methanizers.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Materials Science, Multidisciplinary
Andre T. S. Ribeiro, italo R. S. Araujo, Emerson F. M. da Silva, Pedro N. Romano, Joao M. A. R. Almeida, Eduardo F. Sousa-Aguiar, Radmila Tomovska, Oihane Sanz, Luciano C. Almeida
Summary: The effect of two catalyst preparation methods (incipient wetness impregnation and all-in-one methods) of ceria-alumina-supported Ni-based catalysts on dry reforming of methane reaction was investigated. The all-in-one method provided greater metal dispersion, higher reduced fraction, and increased presence of weak basic sites, resulting in lower carbon deposition and higher conversions compared to the incipient wetness impregnation method. However, the incipient wetness impregnation method showed higher turnover frequency due to weaker metal-support interaction. Overall, the all-in-one method is a promising catalyst preparation technique for dry reforming of methane.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Robson Franca, Francisca Pereira Araujo, Luan Neves, Arthur Melo, Alexsandro Lins, Adriano Santana Soares, Josy Anteveli Osajima, Yuset Guerra, Luciano Costa Almeida, Ramon Raudel Pena-Garcia
Summary: In this study, a ZnO hemisphere-like structure co-doped with Er and Cr was prepared and investigated for its photocatalytic applications. The effects of the dopants on the ZnO lattice were analyzed using various techniques. The co-doped Zn0.94Er0.02Cr0.04O compound showed distorted lattice structure and the energy competition of the dopants influenced the band gap energy of the material. The photocatalytic test revealed a 42.3% degradation rate of methylene blue, which could be further enhanced to 90.1% with optimized H2O2 concentration. The results also suggested that (OH)-O-center dot radicals were the main species involved in the degradation process without the formation of toxic intermediates.
Article
Materials Science, Multidisciplinary
R. Franca, Francisca P. Araujo, S. Castro-Lopes, L. Neves, A. Melo, A. G. Jeronimo, Josy A. Osajima, Y. Guerra, Luciano C. Almeida, R. Pena-Garcia
Summary: In this study, the effect of Cr3+ cations addition on the structural, morphological, optical, and photocatalytic properties of Er-doped ZnO structures was investigated. The results showed that the dopant cations concentrations caused variations in lattice constants and increased the crystallite size and strain in the ZnO crystal lattice. Raman and photoluminescence spectroscopies confirmed the structural atomic disorder. The samples exhibited different morphologies depending on the dopant concentration. In the photocatalytic test, the degradation rate of methylene blue dye increased with the concentration of Cr3+ cations. The removal capacity of the dye was further increased using an optimized H2O2 concentration. The irradiated solution showed no toxicity against Artemia salina.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Alexsandro Lins, Aimee G. Jeronimo, Ricardo Barbosa, Luan Neves, Pollyana Trigueiro, Luciano C. Almeida, Josy A. Osajima, Francisca A. Pereira, Ramon R. Pena-Garcia
Summary: This study synthesized Ni-doped ZnO nanoparticles using cashew tree gum as a mediating agent via a sol-gel method. The introduction of Ni ions caused distortions in the crystal lattice, influencing the structural and optical properties as well as the formation of point defects. The photocatalytic performance of the material was also influenced by the dopant concentration.
Article
Engineering, Chemical
Italo R. S. de Araujo, Andre T. S. Ribeiro, I. C. F. Araujo, N. B. S. Araujo, Evelle D. C. Oliveira, Emerson F. M. da Silva, Oihane Sanz, Ramon R. P. Garcia, Deivson C. S. Sales, Luciano C. Almeida
Summary: In this study, Ni/gamma-Al2O3 (Ni/Al) and Ni/La2O3-gamma-Al2O3 (Ni/La-Al) catalysts were synthesized using the all-in-one method and applied to dry methane reforming. The results showed that the Ni crystallite size was smaller for the catalyst promoted by La, indicating better dispersion of its active phase. The monoliths exhibited a higher conversion rate compared to the powdered catalysts. Deactivation of the monoliths was studied using residual activity deactivation models (DMRA) and a good fit was achieved with high accuracy. The deactivation level of the structured systems was found to vary with the WHSV values. Finally, CO2 regeneration showed superior results compared to H-2 regeneration for the catalysts.
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Andre Luiz Ferreira Carvalho Melo, Marcelo Teixeira Carneiro, Alan Icaro Sousa Morais, Bartolomeu Cruz Viana, Francisco Eroni Paz Santos, Josy Anteveli Osajima, Roosevelt D. S. Bezerra, Ramon Raudel Pena-Garcia, Luciano C. Almeida, Santiago Medina Carrasco, Edson C. Silva-Filho
Summary: Water pollution is a global problem, and this study focused on developing a new technology using activated biochar from pequi almonds for dye removal. The activated biochar showed higher adsorption capacity compared to the original biochar, due to its increased cracks and pores. The study found that the adsorption kinetics followed a pseudo-second-order model, and the Langmuir model described the adsorption isotherms. This research demonstrates the potential application of activated biochar for dye removal in aqueous environments.
Article
Green & Sustainable Science & Technology
Marcelo Teixeira Carneiro, Alan Icaro Sousa Morais, Andre Luiz Ferreira de Carvalho Melo, Francisco Jose Lustosa Ferreira, Francisco Eroni Paz Santos, Bartolomeu Cruz Viana, Josy Anteveli Osajima, Roosevelt D. S. Bezerra, Maria Del Mar Orta Cuevas, Ramon Raudel Pena-Garcia, Luciano C. Almeida, Edson C. Silva-Filho
Summary: This study investigated the efficiency of removing the methylene blue dye using chemically activated biochar from the leaf and stem of water hyacinth as a bioadsorbent. The results showed that the adsorption was more significant in the leaf. Pseudo-second-order kinetics and Langmuir model were found to be suitable for describing the adsorption behavior.
Article
Chemistry, Applied
Alex Leandro Andrade de Lucena, Rayany Magali da Rocha Santana, Marcos Andre Soares de Oliveira, Luciano Costa Almeida, Marta Maria Menezes Bezerra Duarte, Daniella Carla Napoleao
Summary: This study applied photoperoxidation and photo-Fenton AOP to degrade a mixture of pharmaceuticals in water, showing that they can effectively remove drugs while generating some byproducts. Toxicity tests demonstrated that the treated solutions have a certain inhibitory effect on plant seeds.
CHEMICAL INDUSTRY & CHEMICAL ENGINEERING QUARTERLY
(2022)
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.