High-Active Metallic-Activated Carbon Catalysts for Selective Hydrogenation

Autor: Nicolás Carrara, Carolina Betti, Fernando Coloma-Pascual, María Cristina Almansa, Laura Gutierrez, Cristian Miranda, Mónica E. Quiroga, Cecilia R. Lederhos
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: International Journal of Chemical Engineering, Vol 2018 (2018)
Druh dokumentu: article
ISSN: 1687-806X
1687-8078
DOI: 10.1155/2018/4307308
Popis: A series of low-loaded metallic-activated carbon catalysts were evaluated during the selective hydrogenation of a medium-chain alkyne under mild conditions. The catalysts and support were characterized by ICP, hydrogen chemisorption, Raman spectroscopy, temperature-programmed desorption (TPD), temperature-programmed reduction (TPR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR micro-ATR), transmission electronic microscopy (TEM), and X-ray photoelectronic spectroscopy (XPS). When studying the effect of the metallic phase, the catalysts were active and selective to the alkene synthesis. NiCl/C was the most active and selective catalytic system. Besides, when the precursor salt was evaluated, PdN/C was more active and selective than PdCl/C. Meanwhile, alkyne is present in the reaction media, and geometrical and electronic effects favor alkene desorption and so avoid their overhydrogenation to the alkane. Under mild conditions, nickel catalysts are considerably more active and selective than the Lindlar catalyst.
Databáze: Directory of Open Access Journals
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