The influence of Fe on the formation of titanosilicate ETS-4

resumo

ETS-4 has potential applications for the size-selective adsorption and ion exchange. Iron substituted ETS-4 has been hydrothermally synthesized. The incorporation with different amount of iron has been achieved to produce Fe-ETS-4(x) (x=5-13), which shows the flexibility for iron substitution. Low amount of iron in precursor does not disturb the formation of ETS-4. The existence of iron was confirmed by EDS. Direct comparison between in-situ synthesized and iron exchanged samples suggested that iron in former ones does not exist in pore. The iron in the pore of ETS-4 would significantly shift the Si-29 MAS NMR resonance upfield. While in-situ synthesized Fe-ETS-4(x) samples present very similar FTIR and Raman spectra, TG and DSC curves to ETS-4, the iron exchanged ones are clear shifted. The thermal stability of in-situ synthesized Fe-ETS-4(x) samples is very similar to the parent phase, much better than that of iron exchanged one. (C) 2012 Elsevier Inc. All rights reserved.

palavras-chave

MOLECULAR-SIEVES; CATALYTIC-REDUCTION; IRON; FRAMEWORK; SILICATE; FE-ZSM-5; SPECTROSCOPY; ADSORPTION; AMMONIA; N2O

categoria

Chemistry

autores

Craveiro, R; Lin, Z

nossos autores

agradecimentos

This work is supported by FCT project PTDC/CTM/73643/2006. The authors also thank financial support from POCI2010 and FEDER.

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