A new locality of böhmite and zeolite minerals, called „Soutěsky above the quarry“, occurs near quarry „Soutěsky“ on SW slope Hlídka hill, eastward Soutěsky village, about 5 km od town Děčín (Czech Republic). The mineralization is bound to vugs Cenozoic volcanics. Böhmite forms mostly whitish brownish hemispherical spherical clusters up mm in size. unit-cell parameters böhmite, refined from X-r...

In this study, structural, thermal, and hydrogen (H2) adsorption properties of natural analcime-rich zeolite tuff (A) from Trakya (Turkey) that acid-treated forms investigated. Analcime mineral was treated with 0.1, 0.5, 1, 2, 3 M HCl solutions at 80 °C for 5 h. Differences in structural thermal behaviors the analcime samples before after acid- treatment were examined by X-ray fluorescence spec...

The capacity of natural zeolites to absorb anionic pollutants from water is limited. This limitation can be overcome by modifying the surface of the minerals with organic cations. In this research, natural zeolite, Analcime was used for removing the nitrate and nitrite impurities from aqueous solutions. The surface of the zeolite was modified by tetramethylammonium and tetraethylammonium ions t...

Low silica zeolites are synthesized generally by sol-gel method in water. In this study, efforts were made to prepare low silica zeolites from sodium aluminate and sodium silicate, in the presence of alcohols, at 373 K under an atmospheric pressure. It was of our special interest to investigate how the addition of various alcohols into water affects the type of zeolites synthesized during cryst...

Encapsulation of semiconductor materials in zeolites is one the important types composites that have been used as photocatalysts degradation several organic dyes. The high surface area and uniform porous structure zeolite particles prevent coagulation catalyst ensure its stability dispersion. strong polarised electrostatic field can decrease energy consumption needed to facilitate electrons tra...

Abstract ZSM-5 and analcime were successfully synthesized from coal fly ash using hydrothermal method in alkaline solution. The used was taken the Paiton PLTU, one of largest steam power plants Indonesia. purified sulphuric acid for 30 minutes it found that has 17.7 wt.% Si content 2.79 Al content. zeolite synthesis carried out a reactor at 160 o C 3 bar 48 hours both with without alumina addit...

A new locality of zeolite minerals occurs on the NE edge Jedlka village, at SE slope Hlídka hill, 2 km to W Benešov nad Ploučnicí (northern Bohemia, Czech Republic). The mineralization is developed in Cenozoic analcime-nepheline tephrite. Ten mineral species (gmelinite-K, analcime, harmotome, chabazite-Ca, lévyne-Ca, mezolite, natrolite, offretite, phillipsite-K, thomsonite-Ca) were found small...

amygdaloidal, cavity- and fracture-filling zeolites in eocene volcanic rocks from the kuh-e-aradeh of southern kahrizak, in the northernmost part of central iran have been studied in some detail by optical, chemical analysis, sem, and xrd techniques. the zeolites identified, in order of their relative time of formation from early to late, are tetranatrolite, analcime, natrolite, mesolite, stilb...