Article
Chemistry, Applied
R. P. Borges, L. G. Moura, S. Kanitkar, J. J. Spivey, F. B. Noronha, C. E. Hori
Summary: The study found that the silica molar content in Ni/CeO2-SiO2 catalyst significantly affects its performance, with higher silica content leading to larger surface area and smaller Ni crystallite size. Silica content also influences the metal-support interaction, ceria dispersion, and reducibility. Experimental results showed that Ni75CS catalyst performed the best during propane steam reforming.
Article
Thermodynamics
Ahmed A. Askalany, Kutub Uddin, Bidyut B. Saha, Muhammad Sultan, Giulio Santori
Summary: This study presents a new method for experimental investigation of water adsorption kinetics using silica-supported ionic liquid, and predicts its performance in water desalination through modeling. The results suggest a promising future for this material in water desalination applications.
Article
Biochemistry & Molecular Biology
Ahmed Abutaleb, Ibrahim M. Maafa, Nasser Zouli, Ayman Yousef, M. M. El-Halwany
Summary: In this study, NiCoPd tri-NPs@CNFs were synthesized via sol-gel and electrospinning approaches and their catalytic performance in the hydrolysis of sodium borohydride was investigated. The results showed that NiCoPd tri-NPs@CNFs exhibited higher catalytic activity, which may be attributed to the synergistic interaction between the three metals.
Article
Multidisciplinary Sciences
Ahmed M. Abbas, Mohamed E. Sultan, Hisham M. Khater, Mahmoud M. Abd El-razik, Mohamed A. El-Nawawy, Ahmed Z. Sayed
Summary: Low-cost lightweight geopolymer mortars were prepared using water-cooled slag, fly ash, and silica sand flour. The effects of chemical foaming agents on thermal conductivity, bulk density, water absorption, porosity, and compressive strength were studied. Results showed that hydrogen peroxide mixes performed better than sodium perborate mixes in terms of physicochemical and thermal properties.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Zhenchi Chen, Bentian Tang, Yuzhong Niu, Hou Chen, Yongfeng Liu, Aili Wang, Liangjiu Bai
Summary: Silica supported thiosemicarbazide was synthesized and characterized for the adsorption of Cu(II) and Zn(II) from ethanol and aqueous solutions. The adsorption capacity for Cu(II) and Zn(II) in ethanol solution is superior. The adsorption process is controlled by film diffusion and follows a pseudo-second-order model, with increased uptake by higher metal ion concentration and temperature.
Article
Chemistry, Multidisciplinary
Jeffrey S. Derrick, Matthias Loipersberger, Sepand K. Nistanaki, Aila V. Rothweiler, Martin Head-Gordon, Eva M. Nichols, Christopher J. Chang
Summary: This study investigates the influence of bicarbonate on iron porphyrin-catalyzed electrochemical CO2 reduction and demonstrates that templating bicarbonate near the molecular iron porphyrin catalyst increases its acidity and enhances catalytic rates.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Ceramics
L. A. Herweyer, E. J. Opila
Summary: The BN coated alpha-SiC induces a previously unobserved form of hot corrosion of SiC by Na2SO4 below its melting temperature, while above the melting temperature, BN has little effect due to B2O3 volatility. Prolonged exposure led to the formation of a Na2O- and B2O3-containing liquid silicate and accelerated corrosion, resulting in the partial crystallization into a lath-like tridymite and cristobalite mixture. Over time, the consumption rates of SiC flattened out, resulting in decreased oxidation/corrosion kinetics after exposure.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Green & Sustainable Science & Technology
Kantiya Sothornchaiwit, Warayut Dokduea, Weerachart Tangchirapat, Suraparb Keawsawasvong, Chanachai Thongchom, Chai Jaturapitakkul
Summary: This study investigated the effects of silica fume addition and curing temperature on the compressive strength and durability of alkali-activated mortars. It was found that the optimal content of silica fume was 6%, which provided a compressive strength as high as that of mortars cured at 45 degrees C. The alkali-activated mortars performed better in terms of acid and sulfate resistance compared to ordinary Portland cement mortars.
Article
Biochemistry & Molecular Biology
Fabiana Esposito, Antonio Laezza, Valentina Gargiulo, Serena Traboni, Alfonso Iadonisi, Annalisa La Gatta, Chiara Schiraldi, Emiliano Bedini
Summary: Sulfated alginates (ASs) and other sulfated polysaccharides have interesting bioactivities, with the degree of sulfation and the sulfation pattern being key factors for structure-activity relationships. While the former can be controlled through stoichiometry, there is still a lack of suitable methods for regioselective sulfation in ASs. This study reports the regioselective installation of different protecting groups on a mannuronic acid enriched alginate to develop a semi-synthetic approach for regioselectively sulfated AS derivatives.
Article
Chemistry, Physical
Mohammad Hassan Loghmani, Mona Jalali Rad
Summary: In this study, the use of extracted Glucomannan from Orchis Mascula as a matrix for stable cobalt catalysts in the hydrolysis of sodium borohydride for hydrogen generation was explored. The size, morphology, and activity of Co-glucomannan powders were studied by varying MAA/MBA ratios, with characterization done using XRD, XPS, FE-SEM, and TEM techniques. The catalytic activity of Co-glucomannan was tested on the hydrolysis of sodium borohydride, and kinetic studies were used to determine the partial order respect to catalyst dosage and initial concentration of sodium borohydride. The activation energy of the reaction was calculated using the Arrhenius equation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Z. Li, J. Z. Yu, Y. Zhang, D. M. Liu, C. Y. Wang, T. Z. Si, Y. T. Li, Q. A. Zhang
Summary: By utilizing a synergy strategy of confinement and metallic catalysis, NaAlH4 desorption close to room temperature was achieved for the first time, resulting in significant enhancements in hydrogen storage properties of complex hydrides.
JOURNAL OF POWER SOURCES
(2021)
Review
Materials Science, Ceramics
A. Rex, J. H. Z. dos Santos
Summary: This article discusses the use of sol-gel processes in various applications such as dry methane reforming, hydrogenation, hydrolysis, oxidation, photocatalysis, and polymerization. The most commonly used route is base-catalyzed sol-gel, which results in spherical and compact encapsulated catalysts. New methods using mild conditions for oxidation via enzymes and yeast cells are also reported. Nonhydrolytic routes are still relevant for the encapsulation of metallocenes. Silica encapsulation enables a broad range of applications for supported catalysts.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Akihiro Nomoto, Tomoya Okada, Yuki Yamamoto, Shota Kuroda, Kuniaki Marui, Mika Yamamoto, Hidetaka Tsujimoto, Michio Ueshima, Tamotsu Nishigahana, Keiji Itoh, Gohei Kobata, Shintaro Kodama, Akiya Ogawa
Summary: The synthesis of Acid Blue 7 dye using a catalytic oxidation reaction with polyoxometalate catalyst and hydrogen peroxide in water was evaluated as a viable method to reduce the usage of harmful heavy metal oxidants. The reaction successfully produced Acid Blue 7 from the corresponding leuco acid at 95 degrees C in 45 minutes, demonstrating promising applications for 10 g-scale synthesis.
Article
Chemistry, Physical
Lucas G. Moura, Rafael P. Borges, Fabio B. Noronha, Carla E. Hori
Summary: The study investigated the catalytic activity and stability of nickel, platinum, rhodium, and ruthenium-based catalysts during hydrogen production from steam reforming of liquefied petroleum gas. It was found that rhodium and platinum catalysts exhibited higher catalytic activity and lower deactivation compared to nickel and ruthenium catalysts. Small increases in particle sizes of Ni(0) and Ru(0) during the process could contribute to the faster deactivation of Ru/CS and Ni/CS catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Fahriye Donmez, Nezihe Ayas
Summary: In this study, Ni/TiO2 catalysts were synthesized using the sol-gel technique and characterized through various methods, while the effects of different factors on hydrogen production performance were investigated. It was found that high hydrogen yield and production rate could be achieved under specific reaction conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Organic
Geeta Devi Yadav, Pooja Chaudhary, Balaram Pani, Surendra Singh
Summary: Chiral transition metal complexes with privileged ligands are efficient catalysts for various asymmetric organic transformations. Transition metal complexes of C1-symmetric pyrrolidine-based ligands have been widely used in asymmetric organic reactions. However, a comprehensive review article on the transition metal complexes of chiral C1-symmetric pyrrolidine-based ligands derived from (L)-proline has not been published.
TETRAHEDRON LETTERS
(2024)
