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Gabor A. Somorjai - One of the best experts on this subject based on the ideXlab platform.
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Reforming of C_6 Hydrocarbons Over Model Pt Nanoparticle Catalysts
Topics in Catalysis, 2012Co-Authors: Selim Alayoglu, Vladimir V. Pushkarev, Nathan Musselwhite, Simon K. Beaumont, Gabor A. SomorjaiAbstract:Size-Controlled Model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C_6 hydrocarbons in mixtures with 5:1 excess of H_2: methylcyclopentane, n -hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H_2 at 320 °C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C_6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 °C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.
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size Controlled Model co nanoparticle catalysts for co2 hydrogenation synthesis characterization and catalytic reactions
Nano Letters, 2012Co-Authors: Viacheslav Iablokov, Selim Alayoglu, Vladimir V. Pushkarev, Simon K. Beaumont, Paul A Alivisatos, Colin Specht, Jinghua Gao, Norbert Kruse, Gabor A. SomorjaiAbstract:Model cobalt catalysts for CO2 hydrogenation were prepared using colloidal chemistry. The turnover frequency at 6 bar and at 200–300 °C increased with cobalt nanoparticle size from 3 to 10 nm. It was demonstrated that near monodisperse nanoparticles in the size range of 3–10 nm could be generated without using trioctylphosphine oxide, a capping ligand that we demonstrate results in phosphorus being present on the metal surface and poisoning catalyst activity in our application.
Jouni Uitto - One of the best experts on this subject based on the ideXlab platform.
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mineralization anti mineralization networks in the skin and vascular connective tissues
American Journal of Pathology, 2013Co-Authors: Jouni UittoAbstract:Ectopic mineralization has been linked to several common clinical conditions with considerable morbidity and mortality. The mineralization processes, both metastatic and dystrophic, affect the skin and vascular connective tissues. There are several contributing metabolic and environmental factors that make uncovering of the precise pathomechanisms of these acquired disorders exceedingly difficult. Several relatively rare heritable disorders share phenotypic manifestations similar to those in common conditions, and, consequently, they serve as genetically Controlled Model systems to study the details of the mineralization process in peripheral tissues. This overview will highlight diseases with mineral deposition in the skin and vascular connective tissues, as exemplified by familial tumoral calcinosis, pseudoxanthoma elasticum, generalized arterial calcification of infancy, and arterial calcification due to CD73 deficiency. These diseases, and their corresponding mouse Models, provide insight into the pathomechanisms of soft tissue mineralization and point to the existence of intricate mineralization/anti-mineralization networks in these tissues. This information is critical for understanding the pathomechanistic details of different mineralization disorders, and it has provided the perspective to develop pharmacological approaches to counteract the consequences of ectopic mineralization.
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Mineralization/anti-mineralization networks in the skin and vascular connective tissues.
The American journal of pathology, 2013Co-Authors: Jouni UittoAbstract:Ectopic mineralization has been linked to several common clinical conditions with considerable morbidity and mortality. The mineralization processes, both metastatic and dystrophic, affect the skin and vascular connective tissues. There are several contributing metabolic and environmental factors that make uncovering of the precise pathomechanisms of these acquired disorders exceedingly difficult. Several relatively rare heritable disorders share phenotypic manifestations similar to those in common conditions, and, consequently, they serve as genetically Controlled Model systems to study the details of the mineralization process in peripheral tissues. This overview will highlight diseases with mineral deposition in the skin and vascular connective tissues, as exemplified by familial tumoral calcinosis, pseudoxanthoma elasticum, generalized arterial calcification of infancy, and arterial calcification due to CD73 deficiency. These diseases, and their corresponding mouse Models, provide insight into the pathomechanisms of soft tissue mineralization and point to the existence of intricate mineralization/anti-mineralization networks in these tissues. This information is critical for understanding the pathomechanistic details of different mineralization disorders, and it has provided the perspective to develop pharmacological approaches to counteract the consequences of ectopic mineralization.
Selim Alayoglu - One of the best experts on this subject based on the ideXlab platform.
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Reforming of C-6 Hydrocarbons Over Model Pt Nanoparticle Catalysts
'Springer Science and Business Media LLC', 2015Co-Authors: Selim Alayoglu, Nathan Musselwhite, Vv Pushkarev, Sk Beaumont, Ga SomorjaiAbstract:Size-Controlled Model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C-6 hydrocarbons in mixtures with 5:1 excess of H-2: methylcyclopentane, n-hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H-2 at 320 A degrees C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C-6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 A degrees C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.close8
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Reforming of C_6 Hydrocarbons Over Model Pt Nanoparticle Catalysts
Topics in Catalysis, 2012Co-Authors: Selim Alayoglu, Vladimir V. Pushkarev, Nathan Musselwhite, Simon K. Beaumont, Gabor A. SomorjaiAbstract:Size-Controlled Model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C_6 hydrocarbons in mixtures with 5:1 excess of H_2: methylcyclopentane, n -hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H_2 at 320 °C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C_6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 °C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.
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size Controlled Model co nanoparticle catalysts for co2 hydrogenation synthesis characterization and catalytic reactions
Nano Letters, 2012Co-Authors: Viacheslav Iablokov, Selim Alayoglu, Vladimir V. Pushkarev, Simon K. Beaumont, Paul A Alivisatos, Colin Specht, Jinghua Gao, Norbert Kruse, Gabor A. SomorjaiAbstract:Model cobalt catalysts for CO2 hydrogenation were prepared using colloidal chemistry. The turnover frequency at 6 bar and at 200–300 °C increased with cobalt nanoparticle size from 3 to 10 nm. It was demonstrated that near monodisperse nanoparticles in the size range of 3–10 nm could be generated without using trioctylphosphine oxide, a capping ligand that we demonstrate results in phosphorus being present on the metal surface and poisoning catalyst activity in our application.
Vladimir V. Pushkarev - One of the best experts on this subject based on the ideXlab platform.
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Reforming of C_6 Hydrocarbons Over Model Pt Nanoparticle Catalysts
Topics in Catalysis, 2012Co-Authors: Selim Alayoglu, Vladimir V. Pushkarev, Nathan Musselwhite, Simon K. Beaumont, Gabor A. SomorjaiAbstract:Size-Controlled Model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C_6 hydrocarbons in mixtures with 5:1 excess of H_2: methylcyclopentane, n -hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H_2 at 320 °C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C_6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 °C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.
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size Controlled Model co nanoparticle catalysts for co2 hydrogenation synthesis characterization and catalytic reactions
Nano Letters, 2012Co-Authors: Viacheslav Iablokov, Selim Alayoglu, Vladimir V. Pushkarev, Simon K. Beaumont, Paul A Alivisatos, Colin Specht, Jinghua Gao, Norbert Kruse, Gabor A. SomorjaiAbstract:Model cobalt catalysts for CO2 hydrogenation were prepared using colloidal chemistry. The turnover frequency at 6 bar and at 200–300 °C increased with cobalt nanoparticle size from 3 to 10 nm. It was demonstrated that near monodisperse nanoparticles in the size range of 3–10 nm could be generated without using trioctylphosphine oxide, a capping ligand that we demonstrate results in phosphorus being present on the metal surface and poisoning catalyst activity in our application.
Simon K. Beaumont - One of the best experts on this subject based on the ideXlab platform.
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Reforming of C_6 Hydrocarbons Over Model Pt Nanoparticle Catalysts
Topics in Catalysis, 2012Co-Authors: Selim Alayoglu, Vladimir V. Pushkarev, Nathan Musselwhite, Simon K. Beaumont, Gabor A. SomorjaiAbstract:Size-Controlled Model Pt nanoparticle catalysts, synthesized by colloidal chemistry, were used to study the hydrogenative reforming of three C_6 hydrocarbons in mixtures with 5:1 excess of H_2: methylcyclopentane, n -hexane and 2-methylpentane. We found a strong particle size dependence on the distribution of different reaction products for the hydrogenolysis of methylcyclopentane. The reactions of 50 Torr methylcyclopentane in 250 Torr H_2 at 320 °C, using 1.5 and 3.0 nm Pt nanoparticles produced predominantly C_6 isomers, especially 2-methylpentane, whereas 5.2 and 11.3 nm Pt nanoparticles were more selective for the formation of benzene. For the hydrogenolysis of n-hexane and 2-methylpentane, strong particle size effects on the turnover rates were observed. Hexane and 2-methylpentane reacted up to an order of magnitude slower over 3.0 nm Pt than over the other particle sizes. At 360 °C the isomerization reactions were more selective than the other reaction pathways over 3.0 nm Pt, which also yielded relatively less benzene.
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size Controlled Model co nanoparticle catalysts for co2 hydrogenation synthesis characterization and catalytic reactions
Nano Letters, 2012Co-Authors: Viacheslav Iablokov, Selim Alayoglu, Vladimir V. Pushkarev, Simon K. Beaumont, Paul A Alivisatos, Colin Specht, Jinghua Gao, Norbert Kruse, Gabor A. SomorjaiAbstract:Model cobalt catalysts for CO2 hydrogenation were prepared using colloidal chemistry. The turnover frequency at 6 bar and at 200–300 °C increased with cobalt nanoparticle size from 3 to 10 nm. It was demonstrated that near monodisperse nanoparticles in the size range of 3–10 nm could be generated without using trioctylphosphine oxide, a capping ligand that we demonstrate results in phosphorus being present on the metal surface and poisoning catalyst activity in our application.