Fecha
2023-07-01
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Derechos de acceso
info:eu-repo/semantics/openAccess
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Elsevier
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Resumen
Carbon catalysts prepared from pyrolysis of spent tires are found to efficiently catalyse the synthesis of benzodiazepine 1, from o-phenylendiamine 2 and acetone 3, with high conversions and selectivity, under mild reaction conditions, according to Scheme 1.
The most acidic catalyst, CPN_H3PO4, obtained by chemical activation with H3PO4, resulted on the most efficient catalyst affording conversion values higher than 90 %, after 4 h of reaction time, and selectively leading to benzodiazepine 1 (90 %). On the other hand, the CPN and CPN_CO2 catalysts reached high conversions of 2 although diminished selectivity to 1, confirming that the carbon matrix is involved in the first steps of the reaction mainly catalyzing the formation of intermediate 4 as the main reaction product.
Note that all the investigated catalysts are macroporous materials with pore size distribution large enough to favor diffusion of reactants and products. Therefore, the catalytic performance is mainly governed by the chemical surface, in particular by the presence of acid functions as phosphate groups anchored to the carbon surface or as SiP2O7 supported phase.
Finally, considering both experimental and theoretical results, it seems that the most probable catalytic centers comprise phosphate functions in SiP2O7 catalyzing the last cyclization step to 1. Although electrophilicity of carbon acceptor (Cdouble bondN moiety) in the presence of model simulating phosphate groups anchored to the carbon surface was slightly superior, transition structure in the presence of model simulating SiP2O7 showed the smallest free energy barrier.
Descripción
This is an Accepted Manuscript of an article published by Elsevier in "Catalysis Today, 419", available at: https://doi.org/10.1016/j.cattod.2023.114160
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Catalysis Today, 419", disponible en línea: https://doi.org/10.1016/j.cattod.2023.114160
Este es el manuscrito aceptado del artículo publicado por Elsevier en "Catalysis Today, 419", disponible en línea: https://doi.org/10.1016/j.cattod.2023.114160
Categorías UNESCO
Palabras clave
Carbon materials, Heterogeneous catalysis, Fine chemicals, Waste valorization
Citación
Godino-Ojer, M., Morales, V. R., López Peinado, A. J., Bernardo, M., Lapa, N., Ferraria, A. M., do Rego, A. M. B., Fonseca, I. M., Matos, I., & Pérez-Mayoral, E. (2023). P-Doped carbon catalyst highly efficient for benzodiazepine synthesis. Tires valorisation. Catalysis Today, 419. https://doi.org/10.1016/j.cattod.2023.114160
Centro
Facultad de Ciencias
Departamento
Química Inorgánica y Química Técnica