Sebastien Kremer | ExxonMobil - Academia.edu (original) (raw)
Papers by Sebastien Kremer
Studies in Surface Science and Catalysis, 2001
141 02-0-04-Colloid chemical properties of silicalite-I nanoslabs S. Kremer (a), C. Kirschhock (a... more 141 02-0-04-Colloid chemical properties of silicalite-I nanoslabs S. Kremer (a), C. Kirschhock (a), P. Rouxhet (b), PA Jacobs (a) and JA Martens (a) Centrum voor Oppervlaktechemie en Katalyse, KU Leuven, Belgium johan, martens@ agr, kule uven. ac ...
Comptes Rendus Chimie, 2005
Clear solution was prepared by hydrolyzing tetraethylorthosilicate (TEOS) in tetrapropylammonium ... more Clear solution was prepared by hydrolyzing tetraethylorthosilicate (TEOS) in tetrapropylammonium (TPA) hydroxide and heated at 120 °C for various times in order to generate half-nanoslabs, nanoslabs, tablets, intermediates and colloidal Silicalite-1 crystals. These building units were precipitated by addition of cetyltrimethylammonium (CTMA) bromide. After evacuation of TPA and CTMA from the precipitates through calcination, microporous materials having substantial micropore volumes of
Microgravity Science and Technology, 2005
Silicalite-1 zeolite was synthesized from clear solutions prepared from tetraethylorthosilicate, ... more Silicalite-1 zeolite was synthesized from clear solutions prepared from tetraethylorthosilicate, tetrapropylammonium hydroxide and water. Crystallization was performed in a unit composing 30 miniautoclaves programmed to heat to 145 or 155°C and to quench sequentially. The synthesis under microgravity condition was conducted aboard the MAXUS 4 sounding rocket. A reference experiment under normal gravity was executed using the same temperature and
Journal of Physical Chemistry B, 2002
... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of P... more ... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of Physical Chemistry C 2008 112 (1), 80-88. ... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of Physical Chemistry C 2008 112 (1), 80-88. ...
Communications in agricultural and applied biological sciences, 2003
Zeolites are microporous crystalline silicates. Zeolite channels and cavities exchange cations an... more Zeolites are microporous crystalline silicates. Zeolite channels and cavities exchange cations and guest molecules with their environment. This property is extensively exploited in zeolite applications as catalysts and adsorbents. The ultimate goal then obviously is to ...
Angewandte Chemie (International ed. in English), Jan 16, 2001
... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI... more ... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI program. JAM and PAJ acknowledge FWO Vlaanderen for a research grant. Publication History. ... Looveren , PA Jacobs , JA Martens , J. Phys. Chem. B 1999, 103, 49724978. ...
Solid State Sciences, 2005
Ordered mesoporous materials with specific microporosity in the mesopore walls can be assembled b... more Ordered mesoporous materials with specific microporosity in the mesopore walls can be assembled by a secondary templating synthesis departing from a clear subcolloidal suspension dedicated to the tetrapropylammonium (TPA) mediated synthesis of colloidal Silicalite-1. A typical member of this material family is Zeotile-2. Zeotile-2 is mesostructurally similar to the cubic MCM-48 material with exceptional long-range order of the mesostructure. Zeotile-2 samples in which the TPA was either left or evacuated were prepared by leaching in boiling ethanolic acetic acid and calcination. The evacuation of the TPA gave rise to a substantial micropore volume revealed with nitrogen adsorption isotherms. The mesoporosity was independent of the presence of the TPA. Molecular separations of isooctane/octane mixtures illustrated the occurrence of molecular shape selectivity similar to MFI-type zeolites.
Chemical Communications, 2003
n-Alkane hydroisomerisation and hydrocracking experiments reveal that ZSM-5 materials synthesized... more n-Alkane hydroisomerisation and hydrocracking experiments reveal that ZSM-5 materials synthesized by selfassembly of nanoslabs show different molecular shape selectivity than ZSM-5 synthesized by hydrothermal methods.
Applied Catalysis A-general, 2004
Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from alumin... more Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from aluminosilicate nanoslabs of MFI framework type"
Studies in Surface Science and Catalysis, 2000
Ordered porous materials, called Zeogrids, are obtained by aggregation of Silicalite-1 nanoslabs ... more Ordered porous materials, called Zeogrids, are obtained by aggregation of Silicalite-1 nanoslabs upon addition of a secondary template (cetyltrimethylammonium bromide), followed by calcination. The synthesis leads to a lameUar arrangement and fusion of the slabs and a high pore volume, distributed over ultra-micropores (0.14 mL/g) and super- micropores (0.55 mL/g). The use of a secondary template with shorter alkyl chain
Chemistry - A European Journal, 2005
Applied Catalysis A: General, 2004
Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from alumin... more Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from aluminosilicate nanoslabs of MFI framework type"
Angewandte Chemie International Edition, 2001
... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI... more ... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI program. JAM and PAJ acknowledge FWO Vlaanderen for a research grant. Publication History. ... Looveren , PA Jacobs , JA Martens , J. Phys. Chem. B 1999, 103, 49724978. ...
Advances in Space Research, 2003
Advanced Materials, 2003
Silica molecular sieves with controlled porosity crystallize from hydrogel in the presence of org... more Silica molecular sieves with controlled porosity crystallize from hydrogel in the presence of organic template molecules. Patterned, mesoporous silica materials with amorphous walls are obtained using structure directing surfactants or block polymers. In diatoms and sponges the formation of macroporous silica structures is directed by biopolymers and proteins. We report the discovery of crystalline silica materials with two levels of porosity and structural order. At the first level, building units are nanoslabs of uniform size with the Silicalite-1 zeolite framework generated by the tetrapropylammonium template. At the second structural level, the nanoslabs are linked through their corners, edges, or faces following patterns imposed by interaction with surfactant or triblock copolymer molecules. After evacuation of the organic molecules, microporosity is obtained inside the nanoslabs, and a precise mesoporosity between the nanoslabs depending on the tiling pattern of the nanoslabs. Three different tiling patterns are directly imaged by electron microscopy. X-ray diffraction (XRD) and N 2 adsorption confirm the mosaic structures derived from electron microscopy.
Advanced Functional Materials, 2002
Abstract Spherical, micrometer-sized particles with a layered structure were obtained by precipit... more Abstract Spherical, micrometer-sized particles with a layered structure were obtained by precipitation of a Silicalite-1 zeolite nanoslab suspension upon addition of cetyltrimethylammonium bromide (CTMABr) and subsequent calcination. The material had ...
Microgravity environment allows the study of the formation of zeolites and related materials unde... more Microgravity environment allows the study of the formation of zeolites and related materials under almost convection free conditions without the interference of phenomena related to density differences.Results obtained from Sounding Rocket microgravity experiments (MAXUS4 and MAXUS5) gave surprising insights into the mechanism of formation of zeolites with MFI topology. But these experiments also emphasized the need for longer duration missions.
Studies in Surface Science and Catalysis, 2001
141 02-0-04-Colloid chemical properties of silicalite-I nanoslabs S. Kremer (a), C. Kirschhock (a... more 141 02-0-04-Colloid chemical properties of silicalite-I nanoslabs S. Kremer (a), C. Kirschhock (a), P. Rouxhet (b), PA Jacobs (a) and JA Martens (a) Centrum voor Oppervlaktechemie en Katalyse, KU Leuven, Belgium johan, martens@ agr, kule uven. ac ...
Comptes Rendus Chimie, 2005
Clear solution was prepared by hydrolyzing tetraethylorthosilicate (TEOS) in tetrapropylammonium ... more Clear solution was prepared by hydrolyzing tetraethylorthosilicate (TEOS) in tetrapropylammonium (TPA) hydroxide and heated at 120 °C for various times in order to generate half-nanoslabs, nanoslabs, tablets, intermediates and colloidal Silicalite-1 crystals. These building units were precipitated by addition of cetyltrimethylammonium (CTMA) bromide. After evacuation of TPA and CTMA from the precipitates through calcination, microporous materials having substantial micropore volumes of
Microgravity Science and Technology, 2005
Silicalite-1 zeolite was synthesized from clear solutions prepared from tetraethylorthosilicate, ... more Silicalite-1 zeolite was synthesized from clear solutions prepared from tetraethylorthosilicate, tetrapropylammonium hydroxide and water. Crystallization was performed in a unit composing 30 miniautoclaves programmed to heat to 145 or 155°C and to quench sequentially. The synthesis under microgravity condition was conducted aboard the MAXUS 4 sounding rocket. A reference experiment under normal gravity was executed using the same temperature and
Journal of Physical Chemistry B, 2002
... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of P... more ... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of Physical Chemistry C 2008 112 (1), 80-88. ... Colin A. Fyfe, Richard J. Darton, Celine Schneider, and Franziska Scheffler. The Journal of Physical Chemistry C 2008 112 (1), 80-88. ...
Communications in agricultural and applied biological sciences, 2003
Zeolites are microporous crystalline silicates. Zeolite channels and cavities exchange cations an... more Zeolites are microporous crystalline silicates. Zeolite channels and cavities exchange cations and guest molecules with their environment. This property is extensively exploited in zeolite applications as catalysts and adsorbents. The ultimate goal then obviously is to ...
Angewandte Chemie (International ed. in English), Jan 16, 2001
... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI... more ... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI program. JAM and PAJ acknowledge FWO Vlaanderen for a research grant. Publication History. ... Looveren , PA Jacobs , JA Martens , J. Phys. Chem. B 1999, 103, 49724978. ...
Solid State Sciences, 2005
Ordered mesoporous materials with specific microporosity in the mesopore walls can be assembled b... more Ordered mesoporous materials with specific microporosity in the mesopore walls can be assembled by a secondary templating synthesis departing from a clear subcolloidal suspension dedicated to the tetrapropylammonium (TPA) mediated synthesis of colloidal Silicalite-1. A typical member of this material family is Zeotile-2. Zeotile-2 is mesostructurally similar to the cubic MCM-48 material with exceptional long-range order of the mesostructure. Zeotile-2 samples in which the TPA was either left or evacuated were prepared by leaching in boiling ethanolic acetic acid and calcination. The evacuation of the TPA gave rise to a substantial micropore volume revealed with nitrogen adsorption isotherms. The mesoporosity was independent of the presence of the TPA. Molecular separations of isooctane/octane mixtures illustrated the occurrence of molecular shape selectivity similar to MFI-type zeolites.
Chemical Communications, 2003
n-Alkane hydroisomerisation and hydrocracking experiments reveal that ZSM-5 materials synthesized... more n-Alkane hydroisomerisation and hydrocracking experiments reveal that ZSM-5 materials synthesized by selfassembly of nanoslabs show different molecular shape selectivity than ZSM-5 synthesized by hydrothermal methods.
Applied Catalysis A-general, 2004
Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from alumin... more Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from aluminosilicate nanoslabs of MFI framework type"
Studies in Surface Science and Catalysis, 2000
Ordered porous materials, called Zeogrids, are obtained by aggregation of Silicalite-1 nanoslabs ... more Ordered porous materials, called Zeogrids, are obtained by aggregation of Silicalite-1 nanoslabs upon addition of a secondary template (cetyltrimethylammonium bromide), followed by calcination. The synthesis leads to a lameUar arrangement and fusion of the slabs and a high pore volume, distributed over ultra-micropores (0.14 mL/g) and super- micropores (0.55 mL/g). The use of a secondary template with shorter alkyl chain
Chemistry - A European Journal, 2005
Applied Catalysis A: General, 2004
Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from alumin... more Erratum to "Decane hydroconversion on bifunctional zeogrid and nano-zeolite assembled from aluminosilicate nanoslabs of MFI framework type"
Angewandte Chemie International Edition, 2001
... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI... more ... CEAK, JAM, and PAJ acknowledge the Belgian Government for sponsoring in the frame of IUAP-PAI program. JAM and PAJ acknowledge FWO Vlaanderen for a research grant. Publication History. ... Looveren , PA Jacobs , JA Martens , J. Phys. Chem. B 1999, 103, 49724978. ...
Advances in Space Research, 2003
Advanced Materials, 2003
Silica molecular sieves with controlled porosity crystallize from hydrogel in the presence of org... more Silica molecular sieves with controlled porosity crystallize from hydrogel in the presence of organic template molecules. Patterned, mesoporous silica materials with amorphous walls are obtained using structure directing surfactants or block polymers. In diatoms and sponges the formation of macroporous silica structures is directed by biopolymers and proteins. We report the discovery of crystalline silica materials with two levels of porosity and structural order. At the first level, building units are nanoslabs of uniform size with the Silicalite-1 zeolite framework generated by the tetrapropylammonium template. At the second structural level, the nanoslabs are linked through their corners, edges, or faces following patterns imposed by interaction with surfactant or triblock copolymer molecules. After evacuation of the organic molecules, microporosity is obtained inside the nanoslabs, and a precise mesoporosity between the nanoslabs depending on the tiling pattern of the nanoslabs. Three different tiling patterns are directly imaged by electron microscopy. X-ray diffraction (XRD) and N 2 adsorption confirm the mosaic structures derived from electron microscopy.
Advanced Functional Materials, 2002
Abstract Spherical, micrometer-sized particles with a layered structure were obtained by precipit... more Abstract Spherical, micrometer-sized particles with a layered structure were obtained by precipitation of a Silicalite-1 zeolite nanoslab suspension upon addition of cetyltrimethylammonium bromide (CTMABr) and subsequent calcination. The material had ...
Microgravity environment allows the study of the formation of zeolites and related materials unde... more Microgravity environment allows the study of the formation of zeolites and related materials under almost convection free conditions without the interference of phenomena related to density differences.Results obtained from Sounding Rocket microgravity experiments (MAXUS4 and MAXUS5) gave surprising insights into the mechanism of formation of zeolites with MFI topology. But these experiments also emphasized the need for longer duration missions.