Next Article in Journal
Effect of Carbon on the Volume of Solid Iron at High Pressure: Implications for Carbon Substitution in Iron Structures and Carbon Content in the Earth’s Inner Core
Previous Article in Journal
Laser‐Induced Breakdown Spectroscopy—An Emerging Analytical Tool for Mineral Exploration
Previous Article in Special Issue
Grinding Kinetics of Slag and Effect of Final Particle Size on the Compressive Strength of Alkali Activated Materials
Open AccessArticle

Acid and Thermal Treatment of Alkali-Activated Zeolite Foams

Unipetrol Centre for Research and Education, a.s, Areál Chempark 2838, Záluží 1, 436 70 Litvínov, Czech Republic
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 719; https://doi.org/10.3390/min9120719
Received: 17 October 2019 / Revised: 13 November 2019 / Accepted: 18 November 2019 / Published: 20 November 2019
(This article belongs to the Special Issue Alkali Activated Materials: Advances, Innovations, Future Trends)
The foamed alkali-activated zeolite materials have been studied primarily in terms of mechanical and structural properties as potential substitutes for concrete and other building materials. However, they also have interesting textural and acid properties that make them much more useful, especially in the chemical industry. The aim of the study is to map in detail the influence of post-synthesis modifications of alkali-activated natural zeolite foams on their chemical, mechanical, and textural properties for possible use in catalytic and adsorption applications. Alkali-activated natural zeolite foam pellets were prepared by activation with mixed potassium hydroxide and sodium silicate activator and foamed using H2O2 solution. The foam pellets were post-synthetic modified by leaching with mineral and organic acids and calcination. The properties of the modified materials were characterised on the basis of XRF, XRD, N2 physisorption, DRIFT, SEM, NH3-TPD analyses, and the strength measurements. Our data showed that the basic clinoptilolite structure remains unchanged in the material which is stable up to 600 °C after acid leaching. In two-step leaching, the specific surface area increases to 350 m2/g and the leaching process allows the acid properties of the materials to be varied.
Keywords: natural zeolite; clinoptilolite; alkali activation; inorganic foam; acid leaching natural zeolite; clinoptilolite; alkali activation; inorganic foam; acid leaching
Show Figures

Graphical abstract

MDPI and ACS Style

Tišler, Z.; Hrachovcová, K.; Svobodová, E.; Šafář, J.; Pelíšková, L. Acid and Thermal Treatment of Alkali-Activated Zeolite Foams. Minerals 2019, 9, 719.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop