Showing papers in "Microporous and Mesoporous Materials in 2007"

TL;DR: In this paper, the main reaction products formed in alkali activated fly ash systems have been studied by using Infrared Spectroscopy, and it has been shown that there is an asymmetric stretching band associated with that aluminosilicate-type gel, which can be interpreted in terms of that gel showing two different types of Si-O bonds: bridge and terminal bonds.

TL;DR: In this article, the adsorption kinetics of CI reactive blue 221 (RB221) onto sepiolite were investigated in aqueous solution in a batch system with respect to stirring speed, contact time, initial dye concentration, pH, and temperature.

TL;DR: In this article, the evolution of pore structure and surface chemistry in the activation temperature range of 170-450°C was investigated through various characterization techniques and the results showed that the development of porosity (extent of activation) was negligible at activation temperature below 300°C, and rapid evolution occurred in 300-400°C.

TL;DR: Quasi-elastic neutron scattering (QENS) and molecular dynamics (MD) simulations have enabled the quantitative study of molecular motion in pure and mixed fluids sorbed in zeolites over length scales of 0.1-100 nm and time scales of 10 fs-100 ns as mentioned in this paper.

TL;DR: SBA-16 silica was synthesised using the tri-block copolymer F127 as a surfactant in this article, which was eliminated by calcination to 823 K or extraction with ethanol.

TL;DR: In this article, a post-synthesis treatment of a calcined TS-1 zeolite with aqueous solutions of tetrapropylammonium hydroxide leads to hollow TS 1 crystals.

TL;DR: Microporous activated carbon samples were prepared from coconut shells (low-cost lignocellulose waste), using chemical activation with zinc chloride followed by physical activation, and the sample that presented the best characterization results was then evaluated for methane adsorption at pressures between 0.1 and 7 MPa and temperatures in the range 283-333 K.

TL;DR: In this paper, the adsorption characters of the Gn-PAMAM-SBA-15 and EDTA modified materials were studied, and the G3- and G4-pamam-sBA-saba-15 samples showed high selectivities for Cr3+, Pb2+ and Zn2+ with the distribution coefficients K-d values larger than 1.25 x 10(4).

TL;DR: In this paper, an all-silica Deca-deca-dodecasil 3R (DD3R) zeolite was synthesized and the adsorption properties of carbon dioxide and methane were examined on the allsilica DD3R Zeolite.

TL;DR: In this paper, the powder has been characterized using powder X-ray diffraction (PXRD), scanning and transmission electron microscopy (SEM/TEM), surface area and porosity measurements.

TL;DR: In this article, the authors reviewed the equilibrium and kinetic data for the sorption of light olefins and paraffins and proposed a kinetic separation process based on differences in sorption rate.

TL;DR: The mesoporous structures of MS and CaMS were studied by X-ray diffraction, transmission electron microscopy and liquid nitrogen adsorption as discussed by the authors, and the degradation results showed that CaMS had asignificant higher degradation rate than MS.

TL;DR: In this article, a novel sulfonic acid group-functionalized mesoporous carbon was prepared through vapour-phase transfer sulfonation of CMK-3 type mesoporus carbon with the controllable carbonization degree.

TL;DR: By using spherobacterium Streptococcus thermophilus as a natural biotemplate, ZnO hollow spheres have been synthesized in a simple hydrothermal method based on the surface biofunctionality of the microorganism, followed by calcination as mentioned in this paper.

TL;DR: In this article, the authors investigated the adsorption equilibrium and kinetic separation potential of β-zeolite for N2, O2, CO2 and CH4 gases by using concentration pulse chromatography.

TL;DR: In this article, the in situ upgrading of biomass pyrolysis vapors with two mesoporous aluminosilicate materials (MSU-S BEA ) assembled from zeolite Beta (BEA) seeds was tested in the present study, in comparison to conventional Al-MCM-41 and to non-catalytic biomass pyrotechnics.

TL;DR: In this article, the authors developed a novel route to monolithic silica aerogels via ambient pressure drying by the acid-base sol-gel polymerization of methyltrimethoxysilane (MTMS) precursor.

TL;DR: In this article, two series of activated carbon monoliths (discs) have been prepared by chemical activation of olive stones with phosphoric acid or zinc chloride, without the use of any binder.

TL;DR: In this article, a series of mesoporous zeolite and zeotype materials made available by combining new and improved procedures for directly introducing carbon into reaction mixtures with the fluoride route was reported.

TL;DR: In this article, a new field of the catalytic application of Pt/HZSM-22/Al 2 O 3 catalysts for the isomerization of pre-hydrogenated sunflower oils (PHSO) aiming the production of diesel fuel is presented.

TL;DR: In this article, a commercially available Kraft lignin was chemically activated with two alkaline hydroxides, viz NaOH and KOH, using different preparation conditions, and the resultant activated carbons were characterised in terms of the BET surface area, total, micro and meso-pore volumes, average pore width, carbon yield and packing density.

TL;DR: In this article, the feasibility of using surfactant-modified zeolite and kaolinite to remove arsenic from water was evaluated from batch experiments, and the results showed that a significant increase in arsenate sorption capacity could be achieved as the loading level of hexadecyltrimethylammonium, a cationic surfactent, on zeolites and Kaolinite surfaces exceeded monolayer coverage.

TL;DR: In this paper, a rice husk ash supported indium (RHA-In) catalyst was synthesized by direct incorporation of indium ions on to rice hulls ash silica at ordinary temperature.

TL;DR: In this paper, mesoporous silica membranes were prepared on porous alumina supports by both hydrothermal and sol-gel spin-coating methods, and they showed high CO 2 /N 2 separation properties for a mixture of 20% CO 2 and 80% N 2.

TL;DR: In this paper, the effect of different aging and drying conditions on the structure and porosity of silica gels to obtain materials of tailored porosity was studied. And the results showed that the porosity is a key variable that affects the sensitivity and response time of sensors.

TL;DR: In this article, mesoporous CeO2 was synthesized by using CMK-3 carbon as a structure matrix, and the obtained products exhibit uniform pore walls with a diameter of ca. 5nm in a two-dimensional hexagonal periodic arrangement, as well as interparticle porosity.

TL;DR: In this article, the mesoporous material Al-MCM-41 has been reported to exhibit interesting catalytic properties during the pyrolysis of wooden-based biomass, and the results showed that the type of metal is of more importance than the metal siting.

TL;DR: In this paper, aminopropyls and propionates were used on the pore wall of the mesoporous silica MCM-41 for the separation of Cr 2 O 7 2 - and Cu2+.

TL;DR: In this article, a near-infrared-luminescent mesoporous materials were prepared by linking ternary lanthanide (Er3+, Nd3+, Yb3+, Sm3+, Pr3+) complexes to MCM-41 through a functionalized 1,10-phenanthroline (phen) group.

TL;DR: In this paper, micro/mesoporous materials with different contribution of micro and mesoporosity were prepared by recrystallization of zeolite BEA in alkaline solution in the presence of cethyltrimethylammonium bromide.