Zeta Potential of Beta Zeolites: Influence of Structure, Acidity, pH, Temperature and Concentration

• Main Authors: Xuan Liu, Päivi Mäki-Arvela, Atte Aho, Zuzana Vajglova, Vladimir M. Gun’ko, Ivo Heinmaa, Narendra Kumar, Kari Eränen, Tapio Salmi, Dmitry Yu. Murzin
• Format: Article
• Language: English
• Published: MDPI AG 2018-04-01
• Series: Molecules
• Subjects: zeolites; beta; zeta potential
• Online Access: http://www.mdpi.com/1420-3049/23/4/946

Measurements of the zeta potential of solid heterogeneous supports are important for preparation of metal supported catalysts and for shaping zeolites into extrudates. In the current work, different types of heterogeneous support materials such as SiO2, Al2O3, and a range of beta zeolites of different silica- to-alumina ratio were analysed. It was observed that parameters such as temperature, pH and acidity significantly affect the zeta potential. In several instances, depending on the materials’ acidity and microstructure, maxima in zeta potential were observed. The solid materials were thoroughly characterized using XRD, SEM, EDX, TEM, nitrogen physisorption, Al-NMR and FTIR with pyridine before zeta potential measurements.