Mixed oxides of aluminum and magnesium derived from hydrotalcites that were prepared by means of ... more Mixed oxides of aluminum and magnesium derived from hydrotalcites that were prepared by means of a sol–gel method mediated by an emulsified sol as pore template.
The catalyst regeneration leads to the redispersion of smaller cobalt particles leading to a simi... more The catalyst regeneration leads to the redispersion of smaller cobalt particles leading to a similar conversion along successive reaction–regeneration cycles.
Creation of macro–mesopores in ceramic materials through air–liquid foaming and sol–gel processes... more Creation of macro–mesopores in ceramic materials through air–liquid foaming and sol–gel processes for catalytic application.
Recent Progress in Mesostructured Materials D. Zhao, S. Qiu, Y. Tang and C. Yu (Editors) 2007 Els... more Recent Progress in Mesostructured Materials D. Zhao, S. Qiu, Y. Tang and C. Yu (Editors) 2007 Elsevier BV All rights reserved. 761 Basic catalysis by surfactant containing MCM-41 Leandro Martins and Dilson Cardoso* Federal University of S6o Carlos, Chemical Engineering ...
A general and potentially easy method of synthesizing aluminas possessing hierarchical pore struc... more A general and potentially easy method of synthesizing aluminas possessing hierarchical pore structure is presented in this paper. This method is based on the integration of the solgel process with micelles of poly(ethylene oxide)poly(propylene oxide)poly(ethylene oxide) block ...
A series of as-synthesized molecular sieves have been tested and revealed useful as basic catalys... more A series of as-synthesized molecular sieves have been tested and revealed useful as basic catalysts for Knoevenagel condensation under mild conditions. In order to understand the role of the Si/Al ratio, the structure, porosity and template agent, fifteen structures were synthesized ...
Ion exchange of methylammonium cations (Me) in Na-Y zeolite (FAU) and the properties of the resul... more Ion exchange of methylammonium cations (Me) in Na-Y zeolite (FAU) and the properties of the resulting Me-Y material View the MathML source was studied. Results indicated that the ion exchange equilibrium can quickly be reached, even when voluminous tetramethylammonium ...
ABSTRACT Hierarchical aluminas with pore sizes ranging from a few nanometers to micrometers were ... more ABSTRACT Hierarchical aluminas with pore sizes ranging from a few nanometers to micrometers were obtained using an one-pot sol–gel synthesis. The aluminas were synthesized under acid conditions from aluminum isopropoxide in presence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer template and decahydronaphthalene as emulsifier agent. High-resolution transmission electron microscopy, small-angle X-ray scattering, nitrogen physisorption isotherms and mercury intrusion porosimetry provided evidences of porous structure at different hierarchical levels. The produced aluminas possess hierarchical structure composed of different family of pores that coexist in form of cylinders, pyramids and stacking of platelets. The morphology observed by electron microscopy suggests that the cylindrical pores result from the stacking platelets and that the cylinders and pyramidal pores form the walls of macropores of circular section. These aluminas with hierarchical porous architecture present large surface areas (ca. 435 m2 g−1) and pore volumes (ca. 2.1 cm3 g−1), tunable pore-size distributions and good thermal stability.
Mixed oxides of aluminum and magnesium derived from hydrotalcites that were prepared by means of ... more Mixed oxides of aluminum and magnesium derived from hydrotalcites that were prepared by means of a sol–gel method mediated by an emulsified sol as pore template.
The catalyst regeneration leads to the redispersion of smaller cobalt particles leading to a simi... more The catalyst regeneration leads to the redispersion of smaller cobalt particles leading to a similar conversion along successive reaction–regeneration cycles.
Creation of macro–mesopores in ceramic materials through air–liquid foaming and sol–gel processes... more Creation of macro–mesopores in ceramic materials through air–liquid foaming and sol–gel processes for catalytic application.
Recent Progress in Mesostructured Materials D. Zhao, S. Qiu, Y. Tang and C. Yu (Editors) 2007 Els... more Recent Progress in Mesostructured Materials D. Zhao, S. Qiu, Y. Tang and C. Yu (Editors) 2007 Elsevier BV All rights reserved. 761 Basic catalysis by surfactant containing MCM-41 Leandro Martins and Dilson Cardoso* Federal University of S6o Carlos, Chemical Engineering ...
A general and potentially easy method of synthesizing aluminas possessing hierarchical pore struc... more A general and potentially easy method of synthesizing aluminas possessing hierarchical pore structure is presented in this paper. This method is based on the integration of the solgel process with micelles of poly(ethylene oxide)poly(propylene oxide)poly(ethylene oxide) block ...
A series of as-synthesized molecular sieves have been tested and revealed useful as basic catalys... more A series of as-synthesized molecular sieves have been tested and revealed useful as basic catalysts for Knoevenagel condensation under mild conditions. In order to understand the role of the Si/Al ratio, the structure, porosity and template agent, fifteen structures were synthesized ...
Ion exchange of methylammonium cations (Me) in Na-Y zeolite (FAU) and the properties of the resul... more Ion exchange of methylammonium cations (Me) in Na-Y zeolite (FAU) and the properties of the resulting Me-Y material View the MathML source was studied. Results indicated that the ion exchange equilibrium can quickly be reached, even when voluminous tetramethylammonium ...
ABSTRACT Hierarchical aluminas with pore sizes ranging from a few nanometers to micrometers were ... more ABSTRACT Hierarchical aluminas with pore sizes ranging from a few nanometers to micrometers were obtained using an one-pot sol–gel synthesis. The aluminas were synthesized under acid conditions from aluminum isopropoxide in presence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer template and decahydronaphthalene as emulsifier agent. High-resolution transmission electron microscopy, small-angle X-ray scattering, nitrogen physisorption isotherms and mercury intrusion porosimetry provided evidences of porous structure at different hierarchical levels. The produced aluminas possess hierarchical structure composed of different family of pores that coexist in form of cylinders, pyramids and stacking of platelets. The morphology observed by electron microscopy suggests that the cylindrical pores result from the stacking platelets and that the cylinders and pyramidal pores form the walls of macropores of circular section. These aluminas with hierarchical porous architecture present large surface areas (ca. 435 m2 g−1) and pore volumes (ca. 2.1 cm3 g−1), tunable pore-size distributions and good thermal stability.
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