Stabilność struktury gruzińskiego naturalnego heulandytu

Vladimer Tsitsishvili; Nanuli Dolaberidze; Nato Mirdzveli; Manana Nijaradze; Zurab Amiridze; Zurab Amiridze; Bela Khutsishvili

doi:10.29227/IM-2024-01-56

Vladimer Tsitsishvili Georgian National Academy of Sciences, 52, Rustaveli Ave., 0108, Tbilisi, Georgia https://orcid.org/0000-0003-2592-0973
Nanuli Dolaberidze Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0001-6479-2156
Nato Mirdzveli Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0002-1755-5024
Manana Nijaradze Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0003-0882-500X
Zurab Amiridze Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0002-6875-2773
Zurab Amiridze Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0002-6875-2773
Bela Khutsishvili Petre Melikishvili Institute of Physical and Organic Chemistry, I.Javakhishvili Tbilisi State University, 31 A.Politkovskaia Str., 1086 Tbilisi, Georgia https://orcid.org/0000-0003-3685-9506

DOI: https://doi.org/10.29227/IM-2024-01-56

Keywords: structure stability, thermal stability, natural heulandite, Georgia

Abstract

Zeolites have a unique set of molecular-sieve, sorption, ion exchange and catalytic properties due to their framework microporous structure, and structural stability is an important characteristic and often a decisive factor in the application and performance of natural zeolites. The aim of our work was to study the processes occurring under the influence of heat, which determine the thermal stability of the zeolite-containing tuff of the Tedzami-Dzegvi deposit, with zeolite phase content up to 90%, consisting of heulandite and chabazite in a ratio of 8:1, and chemical composition |Na0.25K0.06Ca0.19Mg0.15|[AlSi3.6O9.2].3H2O. It was found that as a result of exposure to heat, a slight dealumination of the surface of the calcined (400-500 °C) samples occurs, as well as dehydration and amorphization of the crystal structure are observed. Sample dehydration occurs in several stages: (i) most of the water (≈60% of the total water content) is continuously lost at temperatures below ≈250 °C, (ii) the part of the remainder (≈24%) is slowly dehydrated up to 650 °C, (iii) complete dehydration of the sample is achieved at ≈800 oC. Amorphization of the heulandite phase begins at temperatures above 200 °C, the transition to the metastable heulandite B phase at ≈340 oC is not fixed, but at high temperatures wairakite or another mineral of the 9.GB.05 group and quartz are formed; the chabazite phase is stable up to ≈1000 oC, and at temperatures above 1100 oC, leucite (K,Na)AlSi2O6 and cristobalite SiO2 are formed. The adsorption of water vapor and benzene on heat-treated samples decreases monotonically with an increase in the calcination temperature, following amorphization. Nitrogen adsorption-desorption isotherms show slight decrease of the absorbent surface area with an increase in the calcination temperature and nonmonotonic changes in average mesopore diameters. It is also shown that heat treatment improves the acid resistance of heulandite by reducing dealumination after sample treatment with hydrochloric acid.

Structure Stability of Georgian Natural Heulandite

Abstract