scispace - formally typeset
Search or ask a question

Showing papers in "Applied Clay Science in 1998"


Journal ArticleDOI
TL;DR: Adsorption of Cr(VI) by various uncalcined and calcined layered double hydroxides (LDH) of Mg-Al, Ni-Al and Zn-Cr types was investigated in this paper.

242 citations


Journal ArticleDOI
TL;DR: In this article, amorphous derivatives of kaolinites were prepared by thermal modification followed by acid activation, which improved the exchangeability of kaolinite and showed that the initial 1 h was sufficient to exchange most of the metal ions.

169 citations


Journal ArticleDOI
TL;DR: Aldol condensation of acetone is performed at 273 K in liquid phase using as catalysts Mg-Al layered double hydroxides (LDH) with Cl − and/or CO 3 2− as compensating anions as mentioned in this paper.

155 citations


Journal ArticleDOI
TL;DR: In this paper, the colour changes found in the wall thickness of calcareous ceramics are analyzed and the main color change from creamy to reddish is due to the incorporation of Fe3+ in several calcium silicates and aluminosilicates developed during firing.

126 citations


Journal ArticleDOI
TL;DR: Sorption of phenol and 2-, 3- and 4-chlorophenol from water by tetramethylammonium (TMA)-smectite and tetramethylphosphonium (tMP)-smeltite was studied in this article.

125 citations


Journal ArticleDOI
TL;DR: In this article, the memory effect of calcined CuCoZn 2 Al 4 O x was studied by coprecipitation at controlled pH, and the resulting hydrotalcite-like (HT) precipitate was calcined at 673, 773, or 873 K.

112 citations


Journal ArticleDOI
TL;DR: In this article, the CO2/steam reforming of methane to produce inexpensive syngas using nickel and magnesium containing hydrotalcite clay-derived catalysts was investigated.

91 citations


Journal ArticleDOI
TL;DR: In this article, a new material is used as a soil stabilizing agent, which is used to solve the problems associated with the increase of olive waste in Jordan, and it is evaluated for use as soil stabilizer, and the results show that the added percentage greater than 2.5% by weight of the burned olive waste will increase the unconfined compressive strength and the maximum dry density.

91 citations


Journal ArticleDOI
TL;DR: In this paper, the authors investigated the physical and chemical properties of the bentonite deposits of Kimolos Island, Aegean, Greece, and found that the rheological and foundry properties are mainly influenced by the sectite content and the degree of disaggregation of the smectite quasicrystals due to the nature of the interlayer cation.

85 citations


Journal ArticleDOI
TL;DR: The sodalite octahydrate zeolite has a CEC of 167 to 367 mEq/100 g when temperature rises from 25 to 75°C as discussed by the authors.

77 citations


Journal ArticleDOI
TL;DR: In this article, the authors performed catalytic decomposition of nitrous oxide into nitrogen and oxygen in a recirculatory static reactor at 50 Torr (133.3 Pa) initial pressure of N2O in the temperature range 423-773 K.

Journal ArticleDOI
TL;DR: In this paper, the authors used a simple flowsheet to remove calcite, dolomite, feldspar and quartz from Gabal Hamdal (Miocene) of Abu-Zeneima locality.

Journal ArticleDOI
TL;DR: In this paper, the role of toxic elements in the development of thermal medicine is discussed, and the contribution of both mineralogy and geochemistry in thermal medicine has been underlined.

Journal ArticleDOI
TL;DR: In this paper, acid treatment of polycation-exchanged bentonites produced hybrid catalysts which enhanced the activity of the clays for the isomerisation of alpha-pinene to camphene and limonene.

Journal ArticleDOI
TL;DR: In this article, Ni-containing catalysts for selective acetylene hydrogenation to ethylene have been prepared by controlled calcination of hydrotalcite-like precursors.

Journal ArticleDOI
TL;DR: In this article, the catalytic activity of two catalysts (Ni10Mg61Al29 and Rh1Mg71Al28, as atomic ratio percent) obtained by calcination and reduction of hydrotalcite-type (HT) precursors were investigated in catalytic partial oxidation (CPO) and CO2-reforming of methane at low contact times.

Journal ArticleDOI
TL;DR: In this paper, anion exchange reaction of a synthetic meixnerite precursor, [Mg 3 Al(OH) 2 ](OH), with macromolecular polyoxometalate ions was investigated as a catalyst for the peroxide oxidation of cyclohexene.

Journal ArticleDOI
TL;DR: In this paper, the synthesis of α,β-unsaturated ketones on hydrotalcite-derived Mg-Al mixed oxides was studied, and the selectivity to α, β-, isomesityl oxide (MO), IMO, and isophorone (IP) was practically 100%.

Journal ArticleDOI
TL;DR: In this paper, a series of as-synthesised double hydroxides (LDHs) were used for the catalytic preparation of glycol ethers, which is a reaction of primary commercial importance.

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the retardation and solid speciation of Cd and Pb migrating into an illitic/smectitic loess loam by diffusion.

Journal ArticleDOI
TL;DR: In this article, a detailed program covering geotechnical, mineralogical, thermal, chemical and physical tests was carried out to evaluate the Sarooj produced by Al-Hamra clays.

Journal ArticleDOI
TL;DR: In this article, a low-grade Korean natural zeolite in which clinoptilolite coexists with quartz and feldspars was treated hydrothermally with 3, 4 and 5 M NaOH solutions during different times ranging from 4 to 40 h, either with or without fusion with NaOH powder at 550°C during 2 h as a pretreatment.

Journal ArticleDOI
TL;DR: In this article, the structure of the resulting films was derived from the (00l) relative intensities observed by X-ray diffraction, and the projected area of the chelate for each orientation was calculated.

Journal ArticleDOI
TL;DR: In this paper, brown, beige and dolomitic (white) sepiolites from the area around Ankara-Polatli-Turktaciri village were tested for the decolorization of sugar solutions at different pH and temperature.

Journal ArticleDOI
TL;DR: In this paper, it was shown that a clay mass containing more than 5% montmorillonite cannot be stabilized with economically justified amounts of cement, and the use of fly ash (5%) acts in such a case as a plasticizer.

Journal ArticleDOI
TL;DR: In this article, five common dispersing agents including tetrasodium pyrophosphate, sodium hexametaphosphate (Sphosphate), sodium polyacrylate, sodium carbonate and aluminum sulfate were investigated in terms of their relationship with the concentration of dissolved ions (Al 3+, Si 4+, Mg 2+, and Ca 2+ ) in calcined kaolin suspensions.

Journal ArticleDOI
TL;DR: In this article, the physicochemical and mineralogical properties of three clays in West Africa, namely, ROG, GRI and POT, were analyzed and a fourth one, AKN1, was found to possess satisfactory characteristics for the described applications.

Journal ArticleDOI
Nuray Yıldız1, Murat Erol1, B Baran1, Yüksel Sarıkaya1, Ayla Çalimli1 
TL;DR: In this article, the effect of the amount of clay on the suspension thixotropy properties was investigated for original and treated suspensions, and results showed that the porosity and the permeability values obtained in each sample are higher than the others.

Journal ArticleDOI
Changwen Hu1, Xu Zhang1, Lin Xu1, Bailin Mu, Wei Zu, Enbo Wang1 
TL;DR: In this article, the authors showed that the composition of the layer and heteropolyanion also influences on the catalytic activity of the layered double hydroxides (LDHs) with a gallery height of 0.99±0.01 nm.

Journal ArticleDOI
TL;DR: In this paper, three pillared clay minerals (PILCs) prepared from two different clay minerals and two different pillaring solutions were impregnated with 600 ppm Rh and the catalytic reaction of NO with CO was tested.