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Chemoselective hydrogenation of cinnamaldehyde at atmospheric pressure over combustion synthesized Pd catalysts

Das, Dipak
•
Pal, Kamalesh
•
Llorca, Jordi
altro
Gayen, Arup
2017
  • journal article

Periodico
REACTION KINETICS, MECHANISMS AND CATALYSIS
Abstract
A series of Pd-supported metal oxides (Al2O3, Fe2O3 and CeO2) have been prepared by a single step solution combustion synthesis (SCS) method. Their catalytic performance was evaluated for the selective hydrogenation of cinnamaldehyde (CAL) to hydrocinnamaldehyde (HCAL) under atmospheric pressure of hydrogen at 100 °C. Among these materials, combustion synthesized Pd (2 at.%)/Al2O3 catalyst exhibits the highest CAL conversion (69%) with complete HCAL selectivity. The analogous catalyst prepared by the incipient wetness impregnation (IWI) method shows an initially similar activity. X-ray diffraction and high resolution transmission electron microscopy analyses of the as prepared SCS sample show fine dispersion of PdO over the γ-Al2O3 support. On ageing, a major portion of PdO is reduced to metallic Pd (Pd2+:Pd0 = 36:64 for the SCS catalyst and Pd2+:Pd0 = 26:74 for the IWI catalyst from X-ray photoelectron spectroscopy studies) suggesting comparatively more ionic character of palladium in the SCS catalyst. In the hydrogen atmosphere, without distinguishing the reductive pretreatment of catalyst and the beginning of hydrogenation subsequent to CAL addition, the Pd-species undergoes rearrangement to form a core–shell like structure of Pd (core)–PdO (periphery) covered with alumina layer, bringing in additional stability to the Pd-species in the SCS catalyst and making it highly recyclable. The analogous IWI catalyst, on the contrary, contains a mixed Pd–PdO ensemble that does not increase the stability causing continuous loss of activity in the consecutive cycles of hydrogenation. © 2017, Akadémiai Kiadó, Budapest, Hungary.
DOI
10.1007/s11144-017-1228-5
WOS
WOS:000408706800010
Archivio
http://hdl.handle.net/11390/1126080
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85025457543
http://www.springerlink.com/content/121595/
https://link.springer.com/article/10.1007%2Fs11144-017-1228-5
Diritti
metadata only access
Soggetti
  • Alumina

  • Atmospheric pressure ...

  • Cinnamaldehyde

  • Hydrocinnamaldehyde

  • Palladium

  • Catalysi

  • Physical and Theoreti...

Scopus© citazioni
8
Data di acquisizione
Jun 14, 2022
Vedi dettagli
Web of Science© citazioni
13
Data di acquisizione
Mar 26, 2024
Visualizzazioni
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Data di acquisizione
Apr 19, 2024
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