Zobrazeno 1 - 10
of 6 538
pro vyhledávání: '"Brønsted acid"'
Autor:
Bandarupalli Krishna, Sounak Roy
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-17 (2024)
Abstract Rationally designing distinct acidic and basic sites can greatly enhance performance and deepen our understanding of reaction mechanisms. In our current investigation, we studied the utilization of Brønsted acid sites within layered graphit
Externí odkaz:
https://doaj.org/article/8b0af9b7a7b64147b384beaf16c43ec5
Publikováno v:
Engineering, Vol 35, Iss , Pp 104-114 (2024)
Due to their tunable acidity, shape selectivity, and excellent stability, zeolites are of great importance as solid acid materials in industrial catalysis. Tuning the properties of the acid sites in zeolites allows for the rational design and fabrica
Externí odkaz:
https://doaj.org/article/74fdea96fd154db09949827932124b99
Publikováno v:
Beilstein Journal of Organic Chemistry, Vol 20, Iss 1, Pp 205-211 (2024)
A convenient and efficient method for the synthesis of optically active difluoro-substituted indoline derivatives starting from the corresponding 3H-indoles by chiral phosphoric acid-catalyzed transfer hydrogenation was developed. Using Hantzsch este
Externí odkaz:
https://doaj.org/article/3b0aee832d9e4166ae5062becb332118
Publikováno v:
Química Nova, Vol 47, Iss 8 (2024)
ZrO2-WO3 mixed metal oxides are important solid acid catalysts, and typically, ammonia gas calcination reduces their acidity. However, in this study, we introduce an updated NH3 calcination technique that can increase the acidity of mesoporous ZrO2-W
Externí odkaz:
https://doaj.org/article/9c243e3ab95f457bb908c376a6342ecc
Autor:
Francesco Dalena, Eddy Dib, Barbara Onida, Giorgia Ferrarelli, Marco Daturi, Girolamo Giordano, Massimo Migliori, Svetlana Mintova
Publikováno v:
Molecules, Vol 29, Iss 18, p 4450 (2024)
In this study, we assessed the quantity, strength, and acidity of zeolite composites comprising Silicalite-1 grown on ZSM-5 crystals using a combination of infrared (IR) and solid-state nuclear magnetic resonance (NMR) spectroscopy. The composites we
Externí odkaz:
https://doaj.org/article/9e7d7e2cc8d448ce9f5a368d082da932
Publikováno v:
Molecules, Vol 29, Iss 17, p 4266 (2024)
A novel approach for the α-alkylation of ketones was developed using Brønsted acid-catalyzed C-C bond cleavage. Both aromatic and aliphatic ketones reacted smoothly with 2-substituted 1,3-diphenylpropane-1,3-diones to afford α-alkylation products
Externí odkaz:
https://doaj.org/article/02f1ddc5d4f243bd85317c918d810a64
Autor:
Horst Hartmann, Jürgen Liebscher
Publikováno v:
Molecules, Vol 29, Iss 13, p 3151 (2024)
Electron-rich heteroaromatics, such as furan, thiophene and pyrrole, as well as their benzo-condensed derivatives, are of great interest as components of natural products and as starting substances for various products including high-tech materials.
Externí odkaz:
https://doaj.org/article/edf8e89613574619929c2483e40b0179
Autor:
Agata Tabero, Aldona Jankowska, Adam Ostrowski, Ewa Janiszewska, Jolanta Kowalska-Kuś, Agnieszka Held, Stanisław Kowalak
Publikováno v:
Molecules, Vol 29, Iss 13, p 3239 (2024)
Imidazole molecules entrapped in porous materials can exhibit high and stable proton conductivity suitable for elevated temperature (>373 K) fuel cell applications. In this study, new anhydrous proton conductors based on imidazole and mesoporous KIT-
Externí odkaz:
https://doaj.org/article/97749c2d794d4bc9968f6d9ac55d8cc6
Publikováno v:
Results in Engineering, Vol 19, Iss , Pp 101377- (2023)
The distribution of Brønsted acid sites in three-dimensional 12-membered pore channels of Beta zeolite was a decisive factor in the alkylation of benzene with cyclohexene. Here, the Brønsted acid site distribution in Beta zeolitic channels was prec
Externí odkaz:
https://doaj.org/article/50339637b599435fa4591e1fe8b93e49
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