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°C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650°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°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

Keywords

• ion exchange of zeolite
• thermal treatment
• x-ray powder diffraction analysis