Active species identification in Zn and Mn-based materials for application in alcohol oxidation reactions

PABLO JORGE LUGGREN; HERNÁN DUARTE; JUAN ZELÍN; MARÍA EUGENIA SAD; VERÓNICA DIEZ; ISABEL DI CÓSIMO

Materials Science and Engineering: B

Elsevier

Año: 2023

0921-5107

Surface and bulk properties and catalytic performance during benzaldehydesynthesis of inexpensive Zn modified-MnCO3 catalysts (xZnMn), prepared byimpregnation method and covering a wide range of Zn loadings (1.0 wt.% Zn < x < 22.6 wt.% Zn) were deeply investigated for the first time. XRD, TPN2 (temperature- programmed decompositions in N2) and XPS characterization showed that different crystalline phases containing Mn and/or Zn species are present in xZnMn. In these phases Mn oxidation state changes from 2+ toward higher values (3+ and 4+) as Zn content increases entailing the transformation of MnCO3 to ZnMn2O4 spinel and MnOx oxides.During benzyl alcohol oxidation at mild reaction conditions using oxygen, thehighest benzaldehyde yield (~70%) was obtained on 15.4 ZnMn sample after 6 h of reaction. The superior catalytic performance of the 15.4ZnMn catalyst was attributed to a synergistic interaction of both metals.