Zinc biomimetic catalysts for epoxidation of olefins with H2O2
authors Fernandes, CI; Vaz, PD; Nunes, TG; Nunes, CD
nationality International
journal APPLIED CLAY SCIENCE
author keywords Catalysis; Epoxidation; Layered Double Hydroxide; Phenylalanine; Zinc
keywords LAYERED DOUBLE HYDROXIDES; INTERCALATION COMPOUNDS; ACTIVE CATALYSTS; AMINO-ACIDS; COMPLEXES; OXIDATION; IMMOBILIZATION; NANOPARTICLES; HYDROTALCITE; PHENOL
abstract A Zn complex was stepwise intercalated in a Mg/Al layered double hydroxide material (HT) holding phenylalanine in its interlayer spacing. The material was characterized by powder X-ray diffraction, FTIR and solid state C-13 NMR spectroscopy. By analogy, the [Zn(phe)(H2O)](NO3) complex bearing deprotonated phenylalanine (phe) amino acid as ligand and a labile water molecule, mimicking biological moieties, was also prepared as model and characterized by HR-MS, FTIR and H-1 solution NMR spectroscopy. Both the Zn-containing HT material and model complex were tested in the catalytic epoxidation of cyclooctene, styrene and 1-octene. All tests were carried out with hydrogen peroxide (H2O2) or tert-butylhydroperoxide (TBHP), leading selectively to epoxides in most cases. Both temperature and oxygen source were found to be key factors in controlling epoxide selectivity, especially when using H2O2, where results were outstanding. Furthermore, the reported results show that the catalytic performance of this Zn system is at the same level of similar systems, holding heavier metals and less sustainable, found in the literature, while the Zn-containing HT catalyst had also the advantage of recyclability.
publisher ELSEVIER
issn 0169-1317
year published 2020
volume 190
digital object identifier (doi) 10.1016/j.clay.2020.105562
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Mineralogy
subject category Chemistry; Materials Science; Mineralogy
unique article identifier WOS:000529362000006
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.605
5 year journal impact factor 4.549
category normalized journal impact factor percentile 78.885
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg