"Adsorption of gaseous SO2 and structural changes of montmorillonite"

C. VOLZONE, J. ORTIGA.

APPLIED CLAY SCIENCE

Elsevier

Año: 2009 vol. 44 p. 251 - 254

0169-1317

Several montmorillonite samples after adsorption of gaseous SO2 were analyzed to evaluate structural andtextural changes. The equilibrium adsorption of the SO2 gas was measured at 25 °C and 0.1 MPa. The sampleswere characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), swelling index (SI), pHmeasurements, and N2 adsorption–desorption isotherms. SO2 adsorption increased with the specific surfacearea of montmorillonite. SO2 retention decreased pH of the dispersed samples from 6 to 1 and releasedinterlayer and octahedral cations from the structure, which increased the specific BET surface area andspecific micropore surface similar to that of acid-activated montmorillonite. © 2009 Published by Elsevier B.V.2 were analyzed to evaluate structural andtextural changes. The equilibrium adsorption of the SO2 gas was measured at 25 °C and 0.1 MPa. The sampleswere characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), swelling index (SI), pHmeasurements, and N2 adsorption–desorption isotherms. SO2 adsorption increased with the specific surfacearea of montmorillonite. SO2 retention decreased pH of the dispersed samples from 6 to 1 and releasedinterlayer and octahedral cations from the structure, which increased the specific BET surface area andspecific micropore surface similar to that of acid-activated montmorillonite. © 2009 Published by Elsevier B.V.