The Experts below are selected from a list of 3492 Experts worldwide ranked by ideXlab platform
Madjid Mohseni - One of the best experts on this subject based on the ideXlab platform.
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synthesis of photocatalytic nanosized tio2 ag particles with sol gel method using Reduction Agent
Journal of Molecular Catalysis A-chemical, 2005Co-Authors: Seongsoo Hong, Madjid MohseniAbstract:Abstract TiO2–Ag nonoparticles were prepared with the sol–gel method using a Reduction Agent. The physical properties of the prepared particles were investigated by several characterization techniques. The major phase of all the prepared TiO2–Ag particles was an anatase structure regardless of the AgNO3 content. When the AgNO3 content was 2 mmol/mol of TiO2, the major phase (1 1 1) of silver could be clearly seen. The crystallite size of the TiO2 particles calcined at 300 °C was 5–6 nm and that of the Ag particles increased from 10 to 15 nm with increasing AgNO3 content. The high-resolution transmission electron micrographs (HR-TEM) showed that TiO2–Ag nanoparticles possessed a spherical morphology with a narrow size distribution. The lattice fringe was 3.5 A, which corresponds to the lattice spacing of (1 0 1) plane in the anatase phase. In addition, the presence of Ag in TiO2–Ag nanoparticle prepared by the sol–gel method using a Reduction Agent improved the photodegradation of p-nitrophenol and the photocatalytic activity of TiO2–Ag increased with the increase in the AgNO3 content.
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Synthesis of photocatalytic nanosized TiO2–Ag particles with sol–gel method using Reduction Agent
Journal of Molecular Catalysis A-chemical, 2005Co-Authors: Seongsoo Hong, Madjid MohseniAbstract:Abstract TiO2–Ag nonoparticles were prepared with the sol–gel method using a Reduction Agent. The physical properties of the prepared particles were investigated by several characterization techniques. The major phase of all the prepared TiO2–Ag particles was an anatase structure regardless of the AgNO3 content. When the AgNO3 content was 2 mmol/mol of TiO2, the major phase (1 1 1) of silver could be clearly seen. The crystallite size of the TiO2 particles calcined at 300 °C was 5–6 nm and that of the Ag particles increased from 10 to 15 nm with increasing AgNO3 content. The high-resolution transmission electron micrographs (HR-TEM) showed that TiO2–Ag nanoparticles possessed a spherical morphology with a narrow size distribution. The lattice fringe was 3.5 A, which corresponds to the lattice spacing of (1 0 1) plane in the anatase phase. In addition, the presence of Ag in TiO2–Ag nanoparticle prepared by the sol–gel method using a Reduction Agent improved the photodegradation of p-nitrophenol and the photocatalytic activity of TiO2–Ag increased with the increase in the AgNO3 content.
Claudia C. Luhrs - One of the best experts on this subject based on the ideXlab platform.
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Production of graphene from graphite oxide using urea as expansion–Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Abstract Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion–Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion–Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up.
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production of graphene from graphite oxide using urea as expansion Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Abstract Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion–Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion–Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up.
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Production of graphene from graphite oxide using urea as expansion-Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion-Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion-Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up. © 2010 Elsevier Ltd. All rights reserved.
Seongsoo Hong - One of the best experts on this subject based on the ideXlab platform.
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synthesis of photocatalytic nanosized tio2 ag particles with sol gel method using Reduction Agent
Journal of Molecular Catalysis A-chemical, 2005Co-Authors: Seongsoo Hong, Madjid MohseniAbstract:Abstract TiO2–Ag nonoparticles were prepared with the sol–gel method using a Reduction Agent. The physical properties of the prepared particles were investigated by several characterization techniques. The major phase of all the prepared TiO2–Ag particles was an anatase structure regardless of the AgNO3 content. When the AgNO3 content was 2 mmol/mol of TiO2, the major phase (1 1 1) of silver could be clearly seen. The crystallite size of the TiO2 particles calcined at 300 °C was 5–6 nm and that of the Ag particles increased from 10 to 15 nm with increasing AgNO3 content. The high-resolution transmission electron micrographs (HR-TEM) showed that TiO2–Ag nanoparticles possessed a spherical morphology with a narrow size distribution. The lattice fringe was 3.5 A, which corresponds to the lattice spacing of (1 0 1) plane in the anatase phase. In addition, the presence of Ag in TiO2–Ag nanoparticle prepared by the sol–gel method using a Reduction Agent improved the photodegradation of p-nitrophenol and the photocatalytic activity of TiO2–Ag increased with the increase in the AgNO3 content.
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Synthesis of photocatalytic nanosized TiO2–Ag particles with sol–gel method using Reduction Agent
Journal of Molecular Catalysis A-chemical, 2005Co-Authors: Seongsoo Hong, Madjid MohseniAbstract:Abstract TiO2–Ag nonoparticles were prepared with the sol–gel method using a Reduction Agent. The physical properties of the prepared particles were investigated by several characterization techniques. The major phase of all the prepared TiO2–Ag particles was an anatase structure regardless of the AgNO3 content. When the AgNO3 content was 2 mmol/mol of TiO2, the major phase (1 1 1) of silver could be clearly seen. The crystallite size of the TiO2 particles calcined at 300 °C was 5–6 nm and that of the Ag particles increased from 10 to 15 nm with increasing AgNO3 content. The high-resolution transmission electron micrographs (HR-TEM) showed that TiO2–Ag nanoparticles possessed a spherical morphology with a narrow size distribution. The lattice fringe was 3.5 A, which corresponds to the lattice spacing of (1 0 1) plane in the anatase phase. In addition, the presence of Ag in TiO2–Ag nanoparticle prepared by the sol–gel method using a Reduction Agent improved the photodegradation of p-nitrophenol and the photocatalytic activity of TiO2–Ag increased with the increase in the AgNO3 content.
Maria Laura Mastellone - One of the best experts on this subject based on the ideXlab platform.
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tar removal during the fluidized bed gasification of plastic waste
Waste Management, 2009Co-Authors: Umberto Arena, Lucio Zaccariello, Maria Laura MastelloneAbstract:Abstract A recycled polyethylene was fed in a pilot plant bubbling fluidized bed gasifier, having an internal diameter of 0.381 m and a maximum feeding capacity of 90 kg/h. The experimental runs were carried out under various operating conditions: the bed temperature was kept at about 850 °C, the equivalence ratio varied between 0.2 and 0.35, the amount of bed material was between 131 and 215 kg, the fluidizing velocity was between 0.5 and 0.7 m/s, quartz sand and olivine were used as bed material, and air and steam were used as fluidizing reactants. The results confirm that the tar removal treatments applied inside the gasifier (primary methods) can eliminate or strongly reduce the need for a further downstream cleanup of the syngas. In particular, the utilization of a natural olivine as an in situ tar Reduction Agent remarkably improves the quality of the product gas, in terms of both high hydrogen volumetric fraction and larger syngas yield.
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olivine as a tar removal catalyst during fluidized bed gasification of plastic waste
Aiche Journal, 2008Co-Authors: Maria Laura Mastellone, Umberto ArenaAbstract:Natural olivine was used as bed material during the gasification of plastic waste in a pilot-scale bubbling fluidized bed reactor. The results indicate that it works as an excellent in-situ tar Reduction Agent, considerably improving the quality of the gas produced, in terms of low tar content, high hydrogen volume fraction and large syngas yield. The phenomena concurring to the activation of the catalyst are described together with those that can contribute to deactivate it. A phenomenological description of the different stages occurring during gasification of plastic waste in a fluidized bed of olivine particles is also reported. © 2008 American Institute of Chemical Engineers AIChE J, 2008
Stephen Wakeland - One of the best experts on this subject based on the ideXlab platform.
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Production of graphene from graphite oxide using urea as expansion–Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Abstract Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion–Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion–Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up.
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production of graphene from graphite oxide using urea as expansion Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Abstract Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion–Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion–Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up.
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Production of graphene from graphite oxide using urea as expansion-Reduction Agent
Carbon, 2010Co-Authors: Stephen Wakeland, John K. Grey, Ricardo Martínez, Claudia C. LuhrsAbstract:Graphene sheets were produced from graphite oxide using a simple two-step process. First, graphite oxide (GO) is well mixed with an expansion-Reduction Agent, such as urea, that decomposes upon heating to release reducing gases. Second, the mix is heated in an inert gas environment (e.g. N2) for a very short time to a moderate temperature (ca. 600 °C). Reaction temperature selection should be consistent with the decomposition temperature of the expansion-Reduction Agent. Upon cooling, graphene can readily be collected as the solid byproduct. Graphene samples were characterized by XRD, TEM, EELS, SEM, Raman Spectroscopy and the GO and urea mixtures decomposition-Reduction process studied by TGA/DSC analysis. This graphene generation process is rapid, inexpensive and easy to scale up. © 2010 Elsevier Ltd. All rights reserved.