Properties Of Montmorillonite Research Articles

Effects of thermal-oxidative aging on rheological properties of montmorillonite modified bitumen

Organic montmorillonite (OMMT) modified bitumen nanocomposites was prepared by melt blending. The effects of thin-film oven test(TFOT) and pressure ageing vessel(PAV) on rheological properties of pristine bitumen and OMMT modified bitumen were investigated by dynamic shear rheometer (DSR). The results show that complex modulus (G*) increases, phase angle (δ) decreases and rutting factor (G*/sin δ) is enhanced for the pristine bitumen after TFOT, whereas G*, δ and G*/sin δ of OMMT modified bitumen have a little change before and after TFOT. Besides, the pristine bitumen exhibits a large increase of G* and a great decrease of δ after PAV aging. However, the changes in G* and δ of OMMT modified bitumen are small before and after PAV. Compared with the pristine bitumen, OMMT modified bitumen presents a lower fatigue factor (G*sin δ) after PAV. As a consequence, resistance to thermal-oxidative aging of bitumen is remarkably improved due to the introduction of OMMT.

Friedel—Crafts Alkylation of a Cage Enone: Synthesis of Aralkyl Substituted Tetracyclo[5.3.1.0[2,6].0[4,8]]undeca‐9,11‐diones and the Formation of Fascinating Novel Cage Compounds with Pyrrole and Thiophene Using Montmorillonite K‐10.

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Adsorption of Ammonia and Sulfur Dioxide by Sorbents Based on Modified Montmorillonite

The sorption properties of montmorillonite modified with Fe(III) and Al(III) polyhydroxo complexes and with Fe(III)-Zr(IV), Fe(II)-Ni(II), and Fe(III)-Al(III) heteronuclear polyhydroxo complexes with respect to ammonia and sulfur dioxide were examined.

Adsorption and Structural Properties of Montmorillonite Pillared with Hydroxocomplexes of Iron and Rare-Earth Metals

The sorption and structural parameters and the thermal stability are studied for montmorillonite pillared with Fe(III) polyhydroxocomplexes and mixed Fe(III)–Me(III) hydroxocomplexes, where Me = Ce, La, Y, or Ln. The dependence of the first basal reflection value d001 on the Fe/Me ratio is found. The d001 value is shown to be determined by the nature of the metal.

Temperature Dependence of the Adsorption of Carbon Tetrachloride on a Microporous Clay Adsorbent

Changes in the surface properties of montmorillonite and its porous structure after the replacement of exchangeable inorganic cations by tetramethylammonium cations were investigated. A thermal pretreatment in a vacuum significantly affects the adsorption properties of tetramethylammonium-montmorillonite with respect to carbon tetrachloride. From a set of sorption isosteres of CCl4on the dehydrated organomontmorillonite measured over a wide temperature range, dependences of heats of adsorption and desorption on the adsorbed amount of substance were calculated.

Adsorption and structural properties of montmorillonite pillared by Cr(III) and Cr(III)-Cu(II) hydroxocomplexes

The sorption and structural parameters and thermal stability of montmorillonite pillared by Cr(III) polyhydroxocomplexes and heteronuclear Cr(III)–Cu(II) polyhydroxocomplexes were investigated. It was shown that the introduction of intercalating Cr(III) and Cr(III)–Cu(II) agents into the montmorillonite increased the value of the first basal reflection (d001) up to 1.85 nm in the first case and up to 1.98 nm, in the second. The dependence of the values of d001and specific surface area on the OH–/Cr3+ratio was found, which is retained during the calcination of the samples up to 500–800°C. The sorption ability of the prepared samples with respect to acetone, ethanol, benzene, toluene, and water was investigated.