Author: Michael Walker
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
Book Description
The removal of trace amounts of acetylene in ethylene streams is a high-volume industrial process that must possess high selectivity of alkyne hydrogenation over hydrogenation of alkenes. Current technology uses metallic nanoparticles, typically palladium or platinum, for acetylene removal. However, problems arise due to the deactivation of the catalysts at high temperatures as well as low selectivities at high conversions. Pore expanded MCM-41 is synthesized via a two-step strategy in which MCM-41 was prepared via cetyltrimethylammonium bromide (CTMABr) followed by the hydrothermal treatment with N,N-dimethyldecylamine (DMDA). This material was washed with ethanol to remove DMDA, or calcined to remove both surfactants. PE-MCM-41 based materials were impregnated with palladium, gold, and palladium-gold nanoparticles. The removal of DMDA had an effect on both the conversion and selectivity, in which they were found to drop significantly. However, by using the bimetallic PdAu catalysts, higher selectivity could be achieved due to increased electron density.
Selective Hydrogenation of Acetylene Over Pd, Au, and PdAu Supported Nanoparticles
Author: Michael Walker
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
Book Description
The removal of trace amounts of acetylene in ethylene streams is a high-volume industrial process that must possess high selectivity of alkyne hydrogenation over hydrogenation of alkenes. Current technology uses metallic nanoparticles, typically palladium or platinum, for acetylene removal. However, problems arise due to the deactivation of the catalysts at high temperatures as well as low selectivities at high conversions. Pore expanded MCM-41 is synthesized via a two-step strategy in which MCM-41 was prepared via cetyltrimethylammonium bromide (CTMABr) followed by the hydrothermal treatment with N,N-dimethyldecylamine (DMDA). This material was washed with ethanol to remove DMDA, or calcined to remove both surfactants. PE-MCM-41 based materials were impregnated with palladium, gold, and palladium-gold nanoparticles. The removal of DMDA had an effect on both the conversion and selectivity, in which they were found to drop significantly. However, by using the bimetallic PdAu catalysts, higher selectivity could be achieved due to increased electron density.
Publisher:
ISBN:
Category : University of Ottawa theses
Languages : en
Pages :
Book Description
The removal of trace amounts of acetylene in ethylene streams is a high-volume industrial process that must possess high selectivity of alkyne hydrogenation over hydrogenation of alkenes. Current technology uses metallic nanoparticles, typically palladium or platinum, for acetylene removal. However, problems arise due to the deactivation of the catalysts at high temperatures as well as low selectivities at high conversions. Pore expanded MCM-41 is synthesized via a two-step strategy in which MCM-41 was prepared via cetyltrimethylammonium bromide (CTMABr) followed by the hydrothermal treatment with N,N-dimethyldecylamine (DMDA). This material was washed with ethanol to remove DMDA, or calcined to remove both surfactants. PE-MCM-41 based materials were impregnated with palladium, gold, and palladium-gold nanoparticles. The removal of DMDA had an effect on both the conversion and selectivity, in which they were found to drop significantly. However, by using the bimetallic PdAu catalysts, higher selectivity could be achieved due to increased electron density.
Catalytic and Process Study of the Selective Hydrogenation of Acetylene and 1,3-Butadiene
Author: Ruijun Hou
Publisher: Springer
ISBN: 981100773X
Category : Science
Languages : en
Pages : 151
Book Description
This thesis offers novel methods for catalyst and process design for the selective hydrogenation of acetylene and 1,3-butadiene. The author predicts the properties of supported Pd–Ni bimetallic catalysts using density functional theory (DFT) calculations and temperature-programmed desorption (TPD). The excellent correlation between model surfaces and supported catalysts demonstrates the feasibility of designing effective bimetallic catalysts for selective hydrogenation reactions. The author also proposes a method for designing non-precious metal catalysts to replace precious metals. She modifies the process of selective hydrogenation of acetylene by coupling the selective adsorption to the selective hydrogenation in the liquid phase, as a result of which the ethylene selectivity is greatly improved and heat transfer is greatly enhanced. Lastly, by analyzing the mechanism of liquid-phase hydrogenation, the author proposes a multi-stage slurry bed reactor for industrial applications.“/p>
Publisher: Springer
ISBN: 981100773X
Category : Science
Languages : en
Pages : 151
Book Description
This thesis offers novel methods for catalyst and process design for the selective hydrogenation of acetylene and 1,3-butadiene. The author predicts the properties of supported Pd–Ni bimetallic catalysts using density functional theory (DFT) calculations and temperature-programmed desorption (TPD). The excellent correlation between model surfaces and supported catalysts demonstrates the feasibility of designing effective bimetallic catalysts for selective hydrogenation reactions. The author also proposes a method for designing non-precious metal catalysts to replace precious metals. She modifies the process of selective hydrogenation of acetylene by coupling the selective adsorption to the selective hydrogenation in the liquid phase, as a result of which the ethylene selectivity is greatly improved and heat transfer is greatly enhanced. Lastly, by analyzing the mechanism of liquid-phase hydrogenation, the author proposes a multi-stage slurry bed reactor for industrial applications.“/p>
Selective Hydrogenation of Acetylene in the Presence of Ethylene Over Supported Pd and Pd-Mg Catalysts
Author: Ying Ji
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 94
Book Description
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 94
Book Description
Surface Chemistry and Catalysis
Author: Albert F. Carley
Publisher: Springer Science & Business Media
ISBN: 9780306473937
Category : Science
Languages : en
Pages : 404
Book Description
Exciting results are still emerging from the many research groups working in this fertile area and the book is an excellent stimulus to researchers at the start of the 21st century."--BOOK JACKET.
Publisher: Springer Science & Business Media
ISBN: 9780306473937
Category : Science
Languages : en
Pages : 404
Book Description
Exciting results are still emerging from the many research groups working in this fertile area and the book is an excellent stimulus to researchers at the start of the 21st century."--BOOK JACKET.
Catalyst Deactivation in the Selective Hydrogenation of Acetylene Over Supported Pd Catalyst
Author: Walter Plante
Publisher:
ISBN:
Category : Catalyst poisoning
Languages : en
Pages : 268
Book Description
Publisher:
ISBN:
Category : Catalyst poisoning
Languages : en
Pages : 268
Book Description
Selective Hydrogenation of Acetylene on Palladium Catalysts Supported on Solvothermal-derived Titanium Dioxide
Author:
Publisher:
ISBN: 9789745313880
Category : Acetylene
Languages : en
Pages :
Book Description
Publisher:
ISBN: 9789745313880
Category : Acetylene
Languages : en
Pages :
Book Description
Regio and Chemo Selective Hydrogenation by Palladium Nanoparticles Embedded in Polyelectrolyte Films
Author: Somnath Bhattacharjee
Publisher:
ISBN:
Category : Hydrogenation
Languages : en
Pages : 342
Book Description
Publisher:
ISBN:
Category : Hydrogenation
Languages : en
Pages : 342
Book Description
The Selective Hydrogenation of Acetylene Over Pd and Pd-Cu on Alumina Catalysts
Author: Stephen Claude LeViness
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 500
Book Description
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 500
Book Description
Noble Metal-Metal Oxide Hybrid Nanoparticles
Author: Satyabrata Mohapatra
Publisher: Elsevier
ISBN: 0128141352
Category : Technology & Engineering
Languages : en
Pages : 674
Book Description
Noble Metal-Metal Oxide Hybrid Nanoparticles: Fundamentals and Applications sets out concepts and emerging applications of hybrid nanoparticles in biomedicine, antibacterial, energy storage and electronics. The hybridization of noble metals (Gold, Silver, Palladium and Platinum) with metal-oxide nanoparticles exhibits superior features when compared to individual nanoparticles. In some cases, metal oxides act as semiconductors, such as nano zinc oxide or titanium oxide nanoparticles, where their hybridization with silver nanoparticles, enhanced significantly their photocatalytic efficiency. The book highlights how such nanomaterials are used for practical applications. Examines the properties of metal-metal oxide hybrid nanoparticles that make them so adaptable Explores the mechanisms by which nanoparticles interact with each other, showing how these can be exploited for practical applications Shows how metal oxide hybrid nanomaterials are used in a range of industry sectors, including energy, the environment and healthcare
Publisher: Elsevier
ISBN: 0128141352
Category : Technology & Engineering
Languages : en
Pages : 674
Book Description
Noble Metal-Metal Oxide Hybrid Nanoparticles: Fundamentals and Applications sets out concepts and emerging applications of hybrid nanoparticles in biomedicine, antibacterial, energy storage and electronics. The hybridization of noble metals (Gold, Silver, Palladium and Platinum) with metal-oxide nanoparticles exhibits superior features when compared to individual nanoparticles. In some cases, metal oxides act as semiconductors, such as nano zinc oxide or titanium oxide nanoparticles, where their hybridization with silver nanoparticles, enhanced significantly their photocatalytic efficiency. The book highlights how such nanomaterials are used for practical applications. Examines the properties of metal-metal oxide hybrid nanoparticles that make them so adaptable Explores the mechanisms by which nanoparticles interact with each other, showing how these can be exploited for practical applications Shows how metal oxide hybrid nanomaterials are used in a range of industry sectors, including energy, the environment and healthcare
Selective Hydrogenation of Acetylene Over Palladium on Ionic Liquid Loaded Silica Support
Author: Ting Zhou
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 164
Book Description
Publisher:
ISBN:
Category : Acetylene
Languages : en
Pages : 164
Book Description