Doped microporous graphitic carbons as metal-free catalysts for the selective hydrogenation of alkynes to alkenes

Autor: Cristina Bucur, Hermenegildo García, Alina Jurca, Vasile I. Parvulescu, Alejandra Rendón-Patiño, Ana Primo, Bogdan Cojocaru
Přispěvatelé: Ministerio de Ciencia e Innovación (España), Generalitat Valenciana
Rok vydání: 2022
Předmět:
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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ISSN: 0021-9517
Popis: Microporous graphitic carbons obtained by pyrolysis of α-cyclodextrin have been conveniently doped with N and P elements by performing the thermal graphitization adding urea or phosphoric acid as source of these elements. Electron microscopy shows that doping does not influence the structure and dimensions of the micropores, while XPS reveals the distribution of these dopant elements in two main families corresponding to pyridinic and pryrrolic N atoms and to triphenylphosphine and triphenylphosphine oxide for P doping. Thermo-programmed desorption of H CO and NH indicates that the presence of dopant element is responsible for chemisorption of these gases and introduces basic and acid sites. These desorption measurements agree with the catalytic performance of the series of carbons for the chemo and stereo selective hydrogenation of internal aliphatic and aromatic alkynes to cis configured alkenes. N/P doped microporous carbons were found to be stable under the reaction conditions, according to the constant TOF values and XRD and XPS characterization of the materials after their use as catalysts. In addition microporosity appears to play a positive effect by comparing the activity of microporous carbons with the performance of analogous N/P-doped graphenes.
Financial support by the Spanish Ministry of Science and Innovation (Severo Ochoa and RTI2018-98237-CO2-1) and the Generalitat Valenciana (Prometeo 2021/038) is gratefully acknowledged. V.P. acknowledge support from UEFISCDI (PN-III-P4-ID-PCE-2016-0146, 121/2017 and PN-III-P4-ID-PCE-2020-1532).
Databáze: OpenAIRE
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