Author: S. Tariq HussainPublisher:
ISBN:
Category :
Languages : en
Pages : 164
Book Description
A Kinetic Study of the Reduction of Nitric Oxide by Carbon Monoxide Over an Alumina Supported Platinum Catalyst
Author: S. Tariq HussainReduction of Nitric Oxide by Carbon Monoxide Over a Silica Supported Platinum Catalyst
Author: D'Arcy Harold LorimerPublisher:
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.
A Kinetic Study of the Reactions and Interactions of Carbon Monoxide, Oxygen and Hydrogen Over a Platinum-alumina Catalyst
Author: Thomas Charles FitzgeraldPublisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 256
Book Description
A Kinetic Study of the Reaction Between Nitric Oxide and Carbon Monoxide Catalyzed by Clean Polycrystalline Platinum
Author: Robert Larry KleinA Simultaneous Infrared and Kinetic Study of the Catalytic Reduction of Nitric Oxide by Carbon Monoxide
Author: Jack Warren LondonThe Effects of Sintering on the Kinetics of Carbon Monoxide Oxidation Over [alpha]-alumina Supported Platinum Catalyst
![The Effects of Sintering on the Kinetics of Carbon Monoxide Oxidation Over [alpha]-alumina Supported Platinum Catalyst PDF](https://books.google.com/books/content/images/frontcover/8TQ-GwAACAAJ?fife=w80-h100)
Author: Edward F. McCarthySimultaneous Kinetic and Infrared Studies of Carbon Monoxide Oxidation on Supported Platinum Catalyst
Author: Kwang-Ho ParkPublisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 0
Book Description
Study of Kinetics and Multiplicity in the Oxidation of Carbon Monoxide
Author: Ali M. S.Publisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 23
Book Description
A study on the kinetics and mutiplicity was made of the oxidation for carbon monoxide over alumina supported Pt catalyst. The rate of reaction was found to be dependent on temperature and on the concentration of carbon monoxide. Under certain conditions of operation, multiplicity of steady state with a hysteresis effect was observed. [Authors' abstract].
Pillared Clays and Related Catalysts
Author: Antonio GilPublisher: Springer Science & Business Media
ISBN: 1441966706
Category : Science
Languages : en
Pages : 531
Book Description
Since the first works introducing the aluminum intercalated clay family in the early 1970s, interest in the synthesis of pillared interlayered clays has increased tremendously, especially research into the properties and applications of new synthesis methods. The need for solids that could be used as cracking catalysts with larger pores than zeolitic materials has spurred the synthesis of new porous materials from clays. Pillared Clays and Related Catalysts reviews the properties and applications of pillared clays and other layered materials used as catalysts, focusing on: the acidity of pillared clays and the effect it has on catalytic performance the use of pillared clays as supports for catalytically active phases, and the use of the resulting solids in environmentally friendly reactions the applications of the selective reduction of NOx the comparison between the reactions of pillared clays and anionic clays.