Author: Henry Douglas Cochran
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
Book Description
An Infrared Study of the Oxidation of Carbon Monoxide on a Platinum Catalyst
Author: Henry Douglas Cochran
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 396
Book Description
An in Situ Infrared Study of Carbon Monoxide Oxidation on a Supported Platinum Catalyst
Transient Infrared Studies of Carbon Monoxide Oxidation on a Supported Platinum Catalyst
Author: Stephen Mark Dwyer
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 278
Book Description
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 278
Book Description
Simultaneous Kinetic and Infrared Studies of Carbon Monoxide Oxidation on Supported Platinum Catalyst
Author: Kwang-Ho Park
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 522
Book Description
Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 522
Book Description
An Infrared Study of the Oxidation of Carbon Monoxide Over Supported Rhodium Catalysts
Author: C. H. Dai
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
The reaction of carbon monoxide and oxygen over supported rhodium films has been studied using infrared spectroscopy. The focus of work was the reactivity of the various CO/Rh/X (X=Al2O3, SiO2, TiO2) surface states for supported catalysts having high and low Rh loading. Under the reaction conditions the 'linear CO' species was the most stable toward oxidation, but this could have been a result of an oxidized Rh surface. A new CO/Rh surface species has been proposed which exhibits an infrared band at 2000/cm for a 0.5% Rh/TiO2 film. This species is believed to be a bridged carbonyl between Rh+1 and the TiO2 support. Originator-supplied keywords include: Infrared spectroscopy, and Carbon dioxide.
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
The reaction of carbon monoxide and oxygen over supported rhodium films has been studied using infrared spectroscopy. The focus of work was the reactivity of the various CO/Rh/X (X=Al2O3, SiO2, TiO2) surface states for supported catalysts having high and low Rh loading. Under the reaction conditions the 'linear CO' species was the most stable toward oxidation, but this could have been a result of an oxidized Rh surface. A new CO/Rh surface species has been proposed which exhibits an infrared band at 2000/cm for a 0.5% Rh/TiO2 film. This species is believed to be a bridged carbonyl between Rh+1 and the TiO2 support. Originator-supplied keywords include: Infrared spectroscopy, and Carbon dioxide.
Reduction of Nitric Oxide by Carbon Monoxide Over a Silica Supported Platinum Catalyst
Author: D'Arcy Harold Lorimer
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Book Description
Reduction of Nitric Oxide by Carbon Monoxide Over a Silica Supported Platinum Catalyst
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
Book Description
The reduction of nitric oxide by carbon monoxide over a 4.5 weight precent platinum catalyst supported on silica was studied at 300 C. Reaction rate data was obtained together with in situ infrared spectra of species on the catalyst surface. The kinetics of the system were found to exhibit two distinct trends, depending on the molar ratio of CO/NO in the reactor. For net reducing conditions (CO/NO> 1) the catalyst underwent a transient deactivation, the extent of which was dependent on the specific CO/NO ratio during reaction. Reactivation of the catalyst was obtained with both oxidizing and reducing pretreatments. For molar feed ratios of CO/NO less than one, carbon monoxide conversion was typically 95 to 100%, resulting in strongly oxidizing conditions over the catalyst. Under these conditions no deactivation was apparent. Infrared spectra recorded under reaction conditions revealed intense bands at 2075 and 2300 cm−1, which were identified as carbon monoxide adsorbed on Pt and Si-NCO, respectively. Isocyanate bands formed under reducing conditions were more intense and exhibited greater stability than those formed under oxidizing conditions. A reaction mechanism based on the dissociation of nitric oxide as the rate-limiting step was used to correlate nitric oxide reaction rates and nitrous oxide selectivities observed under reducing conditions. As part of this mechanism it is assumed that nitrous bxide is formed via a Langmuir-Hinshelwood process in which an adsorbed nitrogen atom reacts with an adsorbed nitric oxide molecule. The nitric oxide reaction rate was found to be first order in nitric oxide partial pressure, and inverse second order in carbon monoxide partial pressure. A mechanism is proposed to qualitatively explain the deactivation process observed under reducing conditions. The essential part of this mechanism is the formation of an isocyanate species on the Pt crystallites of the catalyst and the subsequent transient diffusion of these species to the silica support. The deactivation is believed to result from the build-up of NCO on vacant sites necessary for the dissociation of nitric oxide.
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
Book Description
The reduction of nitric oxide by carbon monoxide over a 4.5 weight precent platinum catalyst supported on silica was studied at 300 C. Reaction rate data was obtained together with in situ infrared spectra of species on the catalyst surface. The kinetics of the system were found to exhibit two distinct trends, depending on the molar ratio of CO/NO in the reactor. For net reducing conditions (CO/NO> 1) the catalyst underwent a transient deactivation, the extent of which was dependent on the specific CO/NO ratio during reaction. Reactivation of the catalyst was obtained with both oxidizing and reducing pretreatments. For molar feed ratios of CO/NO less than one, carbon monoxide conversion was typically 95 to 100%, resulting in strongly oxidizing conditions over the catalyst. Under these conditions no deactivation was apparent. Infrared spectra recorded under reaction conditions revealed intense bands at 2075 and 2300 cm−1, which were identified as carbon monoxide adsorbed on Pt and Si-NCO, respectively. Isocyanate bands formed under reducing conditions were more intense and exhibited greater stability than those formed under oxidizing conditions. A reaction mechanism based on the dissociation of nitric oxide as the rate-limiting step was used to correlate nitric oxide reaction rates and nitrous oxide selectivities observed under reducing conditions. As part of this mechanism it is assumed that nitrous bxide is formed via a Langmuir-Hinshelwood process in which an adsorbed nitrogen atom reacts with an adsorbed nitric oxide molecule. The nitric oxide reaction rate was found to be first order in nitric oxide partial pressure, and inverse second order in carbon monoxide partial pressure. A mechanism is proposed to qualitatively explain the deactivation process observed under reducing conditions. The essential part of this mechanism is the formation of an isocyanate species on the Pt crystallites of the catalyst and the subsequent transient diffusion of these species to the silica support. The deactivation is believed to result from the build-up of NCO on vacant sites necessary for the dissociation of nitric oxide.
Simultaneous Infrared and Kinetic Studies of the Platinum Catalyzed Carbon Monoxide Oxidation
Author: Ronald Alan Sills
Publisher:
ISBN:
Category : Oxidation
Languages : en
Pages : 482
Book Description
Publisher:
ISBN:
Category : Oxidation
Languages : en
Pages : 482
Book Description
A Diffuse Reflectance Infrared Fourier Transform Spectroscopic Study of Platinum /tin (IV) Oxide Low-temperature Carbon Monoxide Oxidation Catalysts
Author: Donna Sue Duarte
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 194
Book Description
Publisher:
ISBN:
Category : Catalysts
Languages : en
Pages : 194
Book Description
An Infrared and Kinetic Study of NO Reduction by CO Over a Pt Catalyst
Author: Charles Nicholas Ludvik
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 220
Book Description