This work describes the characterization by X-ray absorption spectroscopy (XAS) at Fe K-edge of the state of Fe in Fe-ZSM-11 zeolites prepared by novel sol-gel process used to decompose NOx to N-2 by selective catalytic reduction (SCR), using iso-butane as reducer. Determining the Fe K-edge shift, the presence of Fen+ species in Fe-containing zeolite was determined and quantified. The symmetry and electronic characteristics of Fe in Fe-species are also discussed. The structural characteristics of the Fe species present in the catalysts are studied employing extended X-ray absorption fine structure spectroscopy. Fe2+, Fe3+ and Fe2O3 as isolated species were found as the active sites of the material for the SCR of NO, in concordance with Part I of this paper (Applied Catalysis, Part 1, (2003)). (C) 2004 Elsevier B.V. All rights reserved.