Journal ArticleDOI
Importance of Site III Cation of Zeolite A in Microwave Heating
Tatsuo Ohgushi,Takuya Numata +1 more
TLDR
In this paper, the absorption efficiency of dehydrated Na12 − 2xCa x -A zeolites with x = 0, 1.1 and 4 in microwave heating were experimentally and theoretically investigated and compared with one another.Abstract:
Properties of dehydrated Na12 − 2xCa x -A zeolites with x = 0, 1.1 and 4 in microwave heating were experimentally and theoretically investigated and compared with one another. Final heating temperatures of zeolites by microwave radiation were measured against radiation time and the easiness of heating was in the order of Na12-A ≫ Na10Ca1-A > Na4Ca4-A for every irradiating condition studied. Microwave (relative) absorption efficiencies of the zeolites were calculated as a function of temperature with a simple method by using dielectric properties of the dehydrated states. In every temperature calculated, the order of absorption efficiency was Na12-A ≫ Na10Ca1-A ≈ Na4Ca4-A. From these results, it was clearly verified that Na+ ion on the site III played the most important role in absorbing microwaves because Na12-A has one Na+ ion on the site III but Na10Ca1-A and Na4Ca4-A have no cations on the site.read more
Citations
More filters
Journal ArticleDOI
Adsorbents regeneration under microwave irradiation for dehydration and volatile organic compounds gas treatment.
TL;DR: In this paper, an experimental study is presented using several types of adsorbents (silica, activated alumina, NaX and NaY zeolites) and various adsorbates (water, toluene, n -heptane and methylcyclohexane).
Journal ArticleDOI
Removal of VOCs at trace concentration levels from humid air by Microwave Swing Adsorption, kinetics and proper sorbent selection
TL;DR: In this paper, the adsorption of binary mixtures of n-hexane and water in air, together with the regeneration of the sorbents using microwaves is studied for three commercial, faujasite Y type zeolites: NaY, HY and DAY.
Journal ArticleDOI
Mechanisms Responsible for Dielectric Properties of Various Faujasites and Linde Type A Zeolites in the Microwave Frequency Range
TL;DR: In this article, the complex permittivities of several zeolites (NaA, NaK-LSX and NaX, NaY, and DAYs) were measured and interpreted using phenomenological models.
Journal ArticleDOI
Comparisons between Measured and Calculated Properties in the Microwave Heating of Na-A, K-A, and Na,Ca-A Zeolites
TL;DR: In this paper, the relative energy absorption ratios for microwaves among the three zeolites were theoretically calculated as a function of temperature, and properties obtained by the calculations and measurements were compared with each other.
Journal ArticleDOI
Movements of Ions in Zeolite A Containing Hydrogen Ion
Tatsuo Ohgushi,Yuya Sakai +1 more
TL;DR: In this paper, the movement of ions in dehydrated Na11H1-A zeolite (LTA) was studied by dielectric spectroscopy and vapor adsorption techniques, and site affinities of ions were discussed.
References
More filters
Journal ArticleDOI
Accurate redetermination of crystal structure of dehydrated zeolite A. Absence of near zero coordination of sodium. Refinement of silicon,aluminum-ordered superstructure
Joseph J. Pluth,Joseph V. Smith +1 more
Journal ArticleDOI
Controlled Microwave Heating and Melting of Gels
TL;DR: In this article, controlled microwave heating and melting of silica, alumina, and aluminosilicate gels were achieved in a 600-W domestic-type oven.
Journal ArticleDOI
Changes in the sieving action and thermal stability of zeolite a produced by ion-exchange
TL;DR: The thermal stability of molecular sieve 3A is greatly improved by introducing a large number of divalent cations into this K-A zeolite as mentioned in this paper, which is discussed in terms of site-selectivities of the exchangeable cations.
Journal ArticleDOI
The mcirowave heating of zeolites
B.I. Whittington,N.B. Milestone +1 more
TL;DR: In this paper, the heating of zeolites caused by the microwave irradiation at 2450 MHz was examined, and the contribution of ions held at particular sites is discussed, but heating appears associated with the presence of cations in large cavities.
Related Papers (5)
Dielectric properties of dehydrated NaA zeolite, analyses and calculation of dielectric spectra
Tatsuo Ohgushi,Kazushi Ishimaru +1 more