In-containing BEA zeolite for Selective Catalytic Reduction of NOx. Part II: Relation between In active sites and catalytic activity.

OSCAR A. ANUNZIATA; ANDREA R. BELTRAMONE; EDUARDO J. LEDE; FELIX G. REQUEJO

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

Elsevier

Año: 2007 vol. 267 p. 272 - 279

1381-1169

In-containing BEA zeolites showed high activity and selectivity for the nitrogen oxides selective catalytic reduction with methane in presence of oxygen. Perturbed angular correlation (PAC) characterization combined with Fourier transformed infrared spectroscopy (FTIR) of intermediates adspecies and reaction experiments, allowed us to correlate the catalytic activity with the nature of the active sites of the catalysts. The catalyst activity was affected by strong Br¨onsted sites and the type of In precursor and was influenced by the indium loading methods. Indium species wereincorporated into the matrix using two different methods: ion exchange in liquid phase and ion exchange in solid phase, the first one presented a better performance in the SCR reaction.