Adsorption and Reaction of Carbon Monoxide and Nitric Oxide on a Platinum-rhodium Alloy Surface PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Adsorption and Reaction of Carbon Monoxide and Nitric Oxide on a Platinum-rhodium Alloy Surface PDF full book. Access full book title Adsorption and Reaction of Carbon Monoxide and Nitric Oxide on a Platinum-rhodium Alloy Surface by François Jacques Marie Rutten. Download full books in PDF and EPUB format.
Author: François Jacques Marie Rutten
Publisher:
ISBN:
Category :
Languages : en
Pages : 147
Get Book Here
Book Description
Author: François Jacques Marie Rutten
Publisher:
ISBN:
Category :
Languages : en
Pages : 147
Get Book Here
Book Description
Author: Charles Taylor Campbell
Publisher:
ISBN:
Category : Heterogeneous catalysis
Languages : en
Pages : 382
Get Book Here
Book Description
Author: Robert Larry Klein
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
Get Book Here
Book Description
Author: V. Ponec
Publisher: Elsevier
ISBN: 0080528651
Category : Science
Languages : en
Pages : 745
Get Book Here
Book Description
Catalysis by Metals and Alloys
Author: D'Arcy Harold Lorimer
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
Get Book Here
Book Description
Author: Yu Sim Ng
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
Get Book Here
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.
Author: Noel P. Magtoto
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 324
Get Book Here
Book Description
Author: John R. Anderson
Publisher: Springer Science & Business Media
ISBN: 3642932479
Category : Science
Languages : en
Pages : 289
Get Book Here
Book Description
Catalytic steam reforming has grown during the last two or three decades into one of the world's great catalytic processes. It is of major economic significance since the products from it form the feed for a number of other major processes. Nevertheless, catalytic steam reforming is a relatively difficult technology. It operates at high temperatures where problems of the maintenance of materials integrity and of catalyst stability and activity are severe, the establishment of high thermal efficiency of the plant is economically vital, and reactor operation is strongly influenced by mass and heat transport effects. The process is the subject of a thorough review by Dr. J. R. Rostrup-Nielsen who discusses both the basic cataly tic chemistry and the way in which this is interrelated with reactor and plant design. The use of catalytic converters for the purification of automotive exhaust gases is a relatively new technology which was brought into existence by social pressures for the preservation of acceptable environmental conditions. The majority of catalytic practitioners have been able to watch the growth of this technology from its inception to its current state of sophistication. Automotive catalytic converter technology is now in a mature state, and the chapter in this volume by Dr. K. C. Taylor provides a review which covers both the process chemistry and the most important converter design factors.
Author: Xiqing Li
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 330
Get Book Here
Book Description
