搜索结果: 1-15 共查到“理学 Montmorillonites”相关记录54条 . 查询时间(0.108 秒)
Infrared Reflectance Study of Thermally Treated Li- and Cs-Montmorillonites
Cs-Montmorillonite Li-Montmorillonite Longitudinal-Optic (LO) Mode Migration Reflectivity Transverse-Optic (TO) Mode
2011/12/22
Abstract: The structure of Li- and Cs-montmorillonites was studied using infrared (IR) reflectance spectroscopy. The spectra of heat-treated clays between 80 and 220 °C were analyzed by Kramers-Kr&oum...
Thermal analyis of hexadecyltrimethylammonium–montmorillonites
Carbon content curves, Charcoal, Hydrogen content curves, Organo-montmorillonite, Thermo-infrared spectroscopy, Thermogravimetry
2011/11/10
Na-montmorillonite (Na-MONT) was loaded with hexadecyltrimethylammonium cations (HDTMA) by replacing 41 and 90% of the exchangeable Na with HDTMA, labeled OC-41 and OC-90, respectively. Na-MONT, OC-41...
Desorption of benzoic and stearic acid adsorbed upon montmorillonites: a thermogravimetric study
Thermogravimetric analysis Differential thermogravimetric analysis Montmorillonites Desorption Benzoic acid Stearic acid
2011/11/11
The desorption of benzoic acid and stearic acid from sodium and calcium montmorillonites has been studied using thermogravimetric and differential thermogravimetric analysis. Desorption of benzoic aci...
Simulations of Interlayer Methanol in Ca- and Na-Saturated Montmorillonites Using Molecular Dynamics
Methanol Molecular Dynamics Montmorillonite
2011/12/5
Abstract: Molecular dynamics computer simulations were used to study methanol molecules confined between the layers of 2:1 phyllosilicates. The model systems are based on natural Ca- and Na-rich montm...
Adsorption and Degradation of Triasulfuron on Homoionic Montmorillonites
Adsorption Degradation Herbicides Infrared Spectroscopy Montmorillonite Triasulfuron
2011/12/2
Abstract: The adsorption and degradation of the herbicide triasulfuron [2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide] (CMMT) on homoionic Fe3+-, Al3+...
Evaluation of the Acidity of Pillared Montmorillonites by Pyridine Adsorption
Acidity Al-Pillared Montmorillonite Mesoporous Materials Pyridine Adsorption Zr-Pillared Montmorillonite
2011/12/6
Abstract: Two series of pillared clays were prepared from a purified montmorillonite (95%) from La Serrata of Nijar, Spain, and polycations of Al and Zr using various methods. The effect of both the p...
Complex Formation of Cation-Exchanged Montmorillonites with Propylene Carbonate: Osmotic Swelling in Aqueous Electrolyte Solutions
Infra-Red Spectroscopy Intercalation Complex Montmorillonite Osmotic Swelling Propylene Carbonate
2011/12/7
Abstract: Montmorillonites saturated with Li+, Na+, K+, NH4+, Mg2+, Ca2+, Ba2+, or Ni2+ ions can form complexes with propylene carbonate (PC) by intercalation; the d(001) of montmorillonite expands to...
Dehydroxylation Behavior of Heat-Treated and Steam-Treated Homoionic Cis-Vacant Montmorillonites
Celadonite Cis-Vacant Octahedra Dehydroxylation Homoionic Montmorillonite Mass Spectrometry Rehydroxylation Thermogravimetry Trans-Vacant Octahedra
2011/12/7
Abstract: Li+, Na+, Ca2+, Sr2+, Cu2+, or Zn2+-saturated samples of a cis-vacant montmorillonite from Linden, Bavaria, were heated to temperatures between 200–700°C. Half of each heated sample was subs...
Monte Carlo Simulation of the Total Radial Distribution Function for Interlayer Water in Sodium and Potassium Montmorillonites
Adsorbed Water Montmorillonite Neutron Diffraction Water
2011/12/7
Abstract: Monte Carlo simulations based on tested water-water, cation-water, and water-clay potential functions were applied to calculate radial distribution functions for O-O, O-H and H-H spatial cor...
Physico-Chemical Characterization and Catalytic Properties of Copper-Doped Alumina-Pillared Montmorillonites
Alumina Copper Copper Catalyst Montmorillonite Phenol Hydroxylation Pillared Clay
2011/12/2
Abstract: Cu-doped alumina-pillared montmorillonite samples have been prepared and characterized with X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), electron spin resonance (ESR) and inductive...
An FTIR Study of Water Sorption on TMA- and TMPA-Montmorillonites
FTIR TMA-montmorillonites TMPA-montmorillonites Water Sorption
2011/12/1
Abstract: Water inhibits sorption of uncharged organic compounds on montmorillonites saturated with small alkylammonium cations such as tetramethylammonium (TMA) and trimethylphenylammonium (TMPA). As...
FTIR Study of Competitive Water-Arene Sorption on Tetramethylammonium- and Trimethylphenylammonium-Montmorillonites
Alkylammonium Benzene Ethylbenzene Infrared spectroscopy Organoclay Sorption Water
2011/12/1
Abstract: Montmorillonites saturated with small quaternary alkylammonium ions such as tetramethylammonium (TMA) or trimethylphenylammonium (TMPA) are excellent sorbents for aromatic pollutants. In som...
Interaction of Trialkyl Phosphites with Montmorillonites
Ab initio Calculations Complexes Formation Mechanism Montmorillonite Stability Trialkyl Phosphites
2011/12/23
Abstract: Complexes formed between montmorillonite, saturated in Li+, Na+, Mg2+, Ca2+, Co2+, Fe3+, Cu2+ and Zn2+, and trimethyl phosphites (TMP) and triethyl phosphites (TEP) were studied. In all of t...
Mechanism of Adsorption and Desorption of Water Vapor by Homoionic Montmorillonites: 2. The Li+, Na+, K+, Rb+, and Cs+-Exchanged Forms
Adsorption Desorption Exchangeable cations Immersion microcalorimetry Montmorillonite Relative humidity Surface area XRD
2011/12/28
Methods previously used to distinguish between water adsorbed on external surfaces and in the interlamellar space of Na-montmorillonite during adsorption and desorption of water vapor have been extend...
Study of the Nature of Acid Sites of Montmorillonites Pillared with Aluminium and Oligosilsesquioxane Complex Cations. 1. Bronsted Acidity
Bronsted acidity Diffuse reflectance IR-spectroseopy Montmorillonites Pillared clays
2011/12/29
Two samples, obtained by pillaring a Wyoming montmorillonite with hydroxy aluminium and oligosilsesquioxane cations, were studied by stepwise thermal desorption of ammonia and by highly sensitive diff...