Crystal chemical and Ssructural characterization of natural and cation-exchanged mexican Erionite

Autor: Alessandro Pacella, Marcos Esparza-Schulz, Carlos Felipe, Paolo Ballirano, Karla Quiroz-Estrada, Miguel Ángel Hernández-Espinosa
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Minerals
Volume 10
Issue 9
Minerals, Vol 10, Iss 772, p 772 (2020)
Popis: In this work, the chemical structural characterization of the erionite-type zeolite from Agua Prieta, Sonora, Mé
xico, was performed on both pristine and Na, Ca, and Mg exchanged samples in order to identify the various modifications due to cation exchange. The samples investigated were those that showed the best behaviour of CO2 and CH4 adsorption at zero coverage levels and the higher values of surface area reported in our previous studies. According to the crystal-chemical formula (Na3.44K1.96Mg0.63Ca0.62)[Al8.21Si27.79O71.85]·
29.63H2O, the pristine sample has been classified as erionite-Na. Morphological FE-SEM investigation performed on both pristine (ERIN) and Na-exchanged samples (ERINa3) showed a similar range of fiber diameters (27&ndash
37 nm). The chemical analyses of the ion-exchanged samples evidenced the upload of Ca and Mg following ion exchange with Na. Rietveld analysis results allowed the identification of the chemical structural modification caused by the ion exchange process, occurring mainly at the Ca1 site.
Databáze: OpenAIRE
Pro tento záznam nejsou dostupné žádné jednotky.