Related references
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Review
Chemistry, Physical
Jelena Rupar et al.
Summary: The limited reaction rate of the oxygen reduction reaction (ORR) is a limitation in fuel cells and metal-air batteries. Carbon-based catalysts, including those derived from alginate, have shown great promise in terms of economic viability and activity for ORR catalysis.
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Wenyi Zhao et al.
Summary: In this study, the function of copper sites in Cu-SSZ-13, Cu-ZSM-5, and Cu-Beta catalysts on the NH3-SCR of NO is investigated. The results demonstrate that the presence of isolated Cu2+ ions influences the formation of Lewis acid sites and NO3- ions, thereby affecting the low-temperature SCR performance. On the other hand, the stability of Cu+ ions and the presence of Bronsted acid sites are associated with the high-temperature SCR performance. Cu-SSZ-13 exhibits excellent NH3-SCR activity due to its sufficient isolated Cu2+ ions, stable Cu+ ions, and Bronsted acid sites.
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Danijela Smiljanic et al.
Summary: Modified phillipsite composites with different surfactants were prepared and characterized. The drug adsorption capacity and kinetics of the composites were studied for diclofenac sodium (DCF) removal. The influence of surfactant structure on the preparation, properties, and DCF adsorption was investigated. The results showed that the surfactant structure significantly affects DCF adsorption onto the composites.
Review
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Zahra Asgar Pour et al.
Summary: Zeolites, crystalline metallosilicates, are widely used in catalysis, adsorption, and separation due to their unique physicochemical properties. In order to be applicable for industrial purposes, zeolites need to be shaped into desired geometries and sizes. The use of binders in the extrusion process provides mechanical strength but may have adverse effects on zeolite catalytic and sorption properties. Hierarchical structure with various levels of porosity and interconnected network is crucial for improving mass transfer and decreasing diffusion limitation inside zeolite micropores.
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Israel Pala-Rosas et al.
Summary: Y-type zeolites with Si/Al ratios between 7-45 were studied as catalysts for the aminocyclization reaction between acrolein and ammonia. The catalytic activity increased with higher total acidity per gram of catalyst. Pyridine and 3-picoline were produced, along with cracking products, and the selectivity towards 3-picoline was favored with a Bronsted/Lewis acid sites ratio close to 1. The deactivation of the catalysts depended on their textural properties, and the spent catalysts showed uniform deposition of polyaromatic species, resulting in loss of activity.
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Chemistry, Physical
Xinyue Yang et al.
Summary: Developing highly selective and efficient bifunctional catalysts for the hydroisomerization of long-chain n-alkanes is crucial. In this study, a bifunctional Pt/hierarchical SSZ-32 catalyst was prepared to enhance the selective hydroisomerization of n-hexadecane. The pore structure and acid sites of SSZ-32 zeolite were tailored through a sequential desilication-dealumination treatment. The resulting catalyst exhibited high activity and selectivity towards monobranched isomers formation.
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Evan Gildernew et al.
Summary: In this study, a composite of zeolite 13X sorbent infiltrated with a graphene binder is demonstrated for efficient atmospheric water vapor extraction. The composites maintained fidelity when passing through the pore structure and showed improved performance measures for adsorbate loadings and thermal flux.
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Daliborka Popadic et al.
Summary: In this study, unmodified natural silicates were tested as adsorbents for organic pollutants in water. Bentonite showed the highest adsorption capacity, removing up to 237 mg/g of pollutants. The treated adsorbent was also found to be effective as an electrode material for oxygen reduction, achieving a significant removal rate of Methylene Blue through electrochemical treatment.
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Ce Xian et al.
Summary: A series of Y zeolites with different pore properties were prepared as a support for hydrocracking catalysts for the production of BTEX from tetralin. Characterization techniques were used to obtain the properties of the catalysts, and their performance in tetralin hydrocracking was evaluated. The results showed that the Si/Al ratio is a key property of zeolites and an increase in the V-micro/V-meso ratio facilitated the formation of BTEX products. It was also found that thermodynamics control the hydrogenation-cracking pathway and strong acidity affects the equilibrium temperature.
Review
Chemistry, Physical
Natasa R. Mijailovic et al.
Summary: Zeolites are versatile solids with strong catalytic activity and high adsorption capability. They are widely used in environmental protection and drug delivery systems. This review provides a deep insight into the interaction between zeolites and pharmaceuticals, helping scientists expand their knowledge for a more effective application of zeolite adsorption phenomenon.
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Chemistry, Physical
Xiaojing Yong et al.
Summary: In this study, a novel adsorbent was obtained by moderately dealuminizing and etching the spent methanol-to-propylene catalyst. The modified catalyst showed potential for removing VOCs from the air.
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Chemistry, Physical
Zifeng Guo et al.
Summary: The sequential fluorination-alkaline treatment protocol allows for the tailored growth of mesoporosity in siliceous ZSM-5 zeolite. The fluorination step alters the spontaneous growth of mesoporosity in alkaline medium, resulting in a delay in the growth time. The level of fluorination plays a role in either decelerating or enabling the development of mesoporosity. This is attributed to the changes in the states of Al sites as a result of fluorination. The interplay between fluorination and the alkaline medium is proposed to have electronic and steric effects on the environment of Al species.
Article
Chemistry, Physical
Orsina Verde et al.
Summary: Thermogravimetric analysis (TGA) was used to evaluate the thermal stability and coke deposition during ethanol dehydration reaction. It was found that cesium salts reduced the formation of hard coke, and supporting the catalysts on mesoporous SBA-15 molecular sieves significantly reduced the total coke formation.
