Evolution of iron species for promoting the catalytic performance of FeZSM-5 in phenol oxidation. Issue 39 (4th April 2016)

• Record Type: Journal Article
• Authors: Luo, Lei; Dai, Chengyi; Zhang, Anfeng; Wang, Junhu; Song, Chunshan; Guo, Xinwen
• Is Part Of: RSC advances. Volume 6:Issue 39(2016)
• Page Start: 32789
• Page End: 32797
• Publication Date: 2016-04-04
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra03552c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Facile modification of FeZSM-5 utilizing an organic directing agent (ODA) for iron species evolution toward better Fenton activity was developed. Abstract : Facile modification of FeZSM-5 utilizing an organic directing agent (ODA) for iron species evolution toward better Fenton activity was developed. Pristine FeZSM-5, prepared hydrothermally using tetrapropylammonium bromide as the ODA, was thermally treated in nitrogen or air atmosphere for comparison. The as-prepared FeZSM-5 were evaluated by XRD, SEM, TGA, Ar physical adsorption, H2 -TPR, UV-Vis, XPS and Mössbauer spectra, which confirmed well-dispersed iron species and partial transformation of framework iron to non-framework iron and Fe(iii ) to Fe(ii ) during thermal treatment in N2 . The phenol oxidation reaction was applied as a probe reaction and phenol conversion can be improved from 44% to 90% within 60 minutes. By thermal treatment in N2 atmosphere, the ODA plays an important role in modifying non-framework iron species from Fe(iii ) to Fe(ii ) ions which is desirable for improving catalytic activity in Fenton-like systems. The strategy utilizing the thermal reduction effect of the ODA on iron species is a reliable method for preparing well-dispersed and valence tunable iron oxide nanoparticles encapsulated in ZSM-5.