Thermally induced phase transformation of Mn-LTA and Mn-FAU zeolite to anorthite phases

Abstract

Data on thermally induced transformations of Mn exchanged zeolites LTA and FAU topology are presented in this paper. Thermally induced phase transformation of Mn- exchange zeolites are followed in the range from 700 to 1300 o C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 o C. Prolonged heating of the intermediate product above 1100 °C results directly in formation of a disorder Mn-anorthiteLTA and Mn-anorthiteFAU. The parameter of unit cell of Mn-anorthiteLTA and Mn- anorthiteFAU, in temperature range between 700 and 1300 o C, was observed in space group C- 1. The phase conversions in the temperature range investigated were followed by thermal, X- ray powder diffraction and FT-IR analyses.