A critical review of adsorption methods that are currently used in the characterization of ordered organic−inorganic nanocomposite materials is presented, and the adsorption methodology that is potentially useful for this characterization, but has not yet been applied, is discussed. The ordered organic−inorganic nanocomposites include surface-functionalized ordered mesoporous materials (OMMs) with siliceous frameworks (synthesized either via postsynthesis surface modification or via direct co-condensation method), periodic mesoporous organosilicas, and surfactant-containing OMMs. This review covers the methods for determination of the specific surface area and pore volume. The available methods for mesopore size analysis are critically compared and evaluated, with special emphasis on the recent developments related to the application of advanced computational methods for studying adsorption in porous media and to the direct modeling of adsorption using highly ordered surface-functionalized OMMs as model a...

Gas adsorption characterization of ordered organic-inorganic nanocomposite materials

Oxidation catalysis not only plays a crucial role in the current chemical industry for the production of key intermediates such as alcohols, epoxides, aldehydes, ketones and organic acids, but also will contribute to the establishment of novel green and sustainable chemical processes. This review is devoted to dealing with selective oxidation reactions, which are important from the viewpoint of green and sustainable chemistry and still remain challenging. Actually, some well-known highly challenging chemical reactions involve selective oxidation reactions, such as the selective oxidation of methane by oxygen. On the other hand some important oxidation reactions, such as the aerobic oxidation of alcohols in the liquid phase and the preferential oxidation of carbon monoxide in hydrogen, have attracted much attention in recent years because of their high significance in green or energy chemistry. This article summarizes recent advances in the development of new catalytic materials or novel catalytic systems for these challenging oxidation reactions. A deep scientific understanding of the mechanisms, active species and active structures for these systems are also discussed. Furthermore, connections among these distinct catalytic oxidation systems are highlighted, to gain insight for the breakthrough in rational design of efficient catalytic systems for challenging oxidation reactions.

Recent advances in heterogeneous selective oxidation catalysis for sustainable chemistry

The stoichiometries of H2 and CO adsorptions on cobalt: Effects of support and preparation

The science of adhesion: Part 1 Surface and interfacial aspects

Simultaneous removal of organics and heavy metals from industrial wastewater: A review.

The activity of the various CuO species found in supported copper catalysts and the effect of the presence of reaction products, CO2 and H2O, was studied during the complete oxidation of methane. Series of copper catalysts supported on ZrO2 ,A l 2O3 and SiO2 with different metal concentrations were analyzed under identical experimental conditions of reactant concentration and temperature. The catalysts were characterized by TPR, UV–vis spectroscopy and XRD. The results show that the activity of supported CuO is closely related to the kind of Cu species formed on the different supports. It was found that the Cu species formed on ZrO2 and Al2O3 are dependent on the metal loading/support’s surface area ratio, and that the activity of highly dispersed Cu is substantially higher than that of bulk CuO. In the case of silica, only the formation of bulk CuO was detected, accounting for the low activity of CuO/SiO2 catalysts. The activity of highly dispersed Cu species formed on ZrO2 is higher than those formed over Al2O3, and it is not significantly affected by the formation of bulk CuO on the surface. On the contrary, the activity of copper species formed on alumina decreases continuously as the Cu loading is increased. Thus, for the range of copper loading studied in this work, the activity of the catalysts, per gram of loaded Cu, follows the sequence: CuO/ZrO2 > CuO/Al2O3 � CuO/SiO2. It was also found that CO2 does not inhibits the activity of the CuO/ZrO2 catalysts, while water inhibits the combustion reaction of methane, with an estimated reaction order of about � 0.2 for temperatures between 360 8C and 420 8C. # 2007 Elsevier B.V. All rights reserved.

Effect of copper species and the presence of reaction products on the activity of methane oxidation on supported CuO catalysts

In situ IR spectroscopy was used to study NO adsorbed during the NO+CO reaction on two Rh/SiO2 catalysts with 31 and 127 A crystallite sizes. The reaction was studied at T

FTIR study of the reduction reaction of NO by CO over Rh/SiO2 catalysts with different crystallite size

A mean-field study of the (A+BC→AC+12B2) system is developed from hierarchical equations, considering mechanisms that include dissociation, reaction with finite rates, desorption, and diffusion of the adsorbed species. The phase diagrams are compared to Monte Carlo simulations.

Mean-field hierarchical equations for some A+BC catalytic reaction models

Effect of the coordination of the superficial site in the monomer–dimer reaction on a disordered substrate

Surface methylation of aerosil and its influence on the adsorption of water

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