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Catalytic Kinetic Modeling Of Nitric Oxide And Carbon Monoxide Decomposition On Platinum Surfaces Monte Carlo Simulation
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Book Synopsis Catalytic Kinetic Modeling of Nitric Oxide and Carbon Monoxide Decomposition on Platinum Surfaces: Monte Carlo Simulation by : Kelly Ann Cahen
Download or read book Catalytic Kinetic Modeling of Nitric Oxide and Carbon Monoxide Decomposition on Platinum Surfaces: Monte Carlo Simulation written by Kelly Ann Cahen and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media by : Soo-Jin Park
Download or read book Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media written by Soo-Jin Park and published by . This book was released on 2008 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main sources of NOx are diesel engines, automotives, electric utilities, other industrial, commercial, and residential sources that burn fuels at high temperature. The control and abatement of NOx emissions are important because of their harmful effects on the human body and the environment. The strict regulations of NOx emissions and the growing demand for power compel new design of catalytic materials for pollution removal. The most common method for car exhaust NOx treatment involves wet impregnation of noble metals on ceramic substrates. In this work, catalytic nanoparticles doped on nanofiber enhanced ceramic fibrous filter medium structure are developed as an alternative method. The noble metals, palladium, platinum and rhodium doped ceramic nanofibers, are synthesized using electrospinning and are incorporated into the micro-fibrous filter. We have discovered ceramic nanofiber containing noble metals also work in liquid phase catalysis by converting styrene to ethylbenzene at room temperature and atmospheric pressure. The reaction temperature is varied and the filters are tested for decomposition of nitric oxide and carbon monoxide using nanofiber based fibrous filter. Carbon dioxide, nitrogen and nitrous oxide gases were produced. Produced nitrous oxide gas was consumed by reacting with carbon monoxide. The efficiency of the catalytic fibrous filter was similar to commercial catalytic converter by adding of smaller amount of catalyst doped on alumina microfibers. As the amount of catalyst in the fibrous filter media increases the temperature at which all NO disappears decreases. As the inlet concentration of NO gas decreases, all NO disappears from the outlet at a lower temperature. As the face velocity through the fibrous filter media increases, efficiency becomes lower as the residence time of gases through the media decreases. We also tested a catalytic fibrous filter media containing Pd, Pt and Rh, and the performance is similar to that of catalytic convertor. Analytical models are developed to study the performance of filters for isothermal nitric oxide and carbon monoxide gas reaction. The kinetic parameters for the model were determined using the Genetic Algorithm (GA) computer program to determine species concentrations as a function of position. Model and experimental results showed that the decomposition temperature of nitric oxide gas decreases by lowering the inlet gas concentration and increasing of catalyst concentration in the nanofibers. Also a non-isothermal model was developed for direct nitric oxide decomposition to predict temperature and concentration profiles along the filter length.
Book Synopsis A Kinetic Study of the Reaction Between Nitric Oxide and Carbon Monoxide Catalyzed by Clean Polycrystalline Platinum by : Robert Larry Klein
Download or read book A Kinetic Study of the Reaction Between Nitric Oxide and Carbon Monoxide Catalyzed by Clean Polycrystalline Platinum written by Robert Larry Klein and published by . This book was released on 1984 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reduction of Nitric Oxide by Carbon Monoxide Over a Silica Supported Platinum Catalyst by :
Download or read book Reduction of Nitric Oxide by Carbon Monoxide Over a Silica Supported Platinum Catalyst written by and published by . This book was released on 1978 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Oscillatory Oxidation of Carbon Monoxide Over Pt, Pd, and Ir Catalysts by : John E. Turner
Download or read book The Oscillatory Oxidation of Carbon Monoxide Over Pt, Pd, and Ir Catalysts written by John E. Turner and published by . This book was released on 1982 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media of Varying Diameters by : Renee Lynn Petty
Download or read book Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media of Varying Diameters written by Renee Lynn Petty and published by . This book was released on 2010 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen Oxide (NO) and carbon monoxide (CO) are major pollutants in the exhaust streams of automobiles, power plants, and other combustion processes. The growing concerns for the environment have resulted in increasingly restrictive emission standards. The removal of NO and CO from exhaust gases is a challenging task. One method for harmful gas removal is using a catalyst for dissociation. This work explored an alternative method for catalytic reduction of NO. Polymer solutions with palladium catalyst and ceramic precursors were electrospun to form polymer nanofibers. These nanofibers were heated to form ceramic nanofibers with catalyst nanoparticles and were mixed with microfibers to form a nonwoven fibrous catalyst support structure. The concentration of the polymer was varied to create nanofibers with diameters ranging from 100 to 700 nm with a constant mass of catalyst particles per mass of fiber. The effect of the fiber diameter on the corresponding catalyst structure performance was tested. A surface area comparison test was completed to determine whether the reactions occur strictly on the surface of the catalyst or if diffusion occurs. An aging comparison was also completed which tested 1 week old catalytic filters compared to 6 months old. A conventional catalytic converter was tested to verify the performance was similar to the catalytic fibrous filter media containing only palladium. Experiments were carried out using a lab reactor to expose the media to a mixture of gases simulating an exhaust stream at room temperature to a maximum of 450°C. The reactor exhaust concentrations are measured using gas chromatography (GC) to determine the catalyst performance. Results indicated that the catalytic reaction performance was about the same for fiber sizes ranging from 100 to 700 nm on a mass basis with a reduction temperature of 325-350°C. The surface area comparison filter reduced at 275°C which showed that both surface catalyst particles and particles within the fibers are available for reaction. Furthermore, a conventional catalytic converter reduced at approximately 325°C which exhibits comparable catalytic performance with the catalytic filters. Model theory and equations were also developed for decomposition reactions of NO and CO using elementary reactions.
Book Synopsis A Kinetic Study of the Reduction of Nitric Oxide by Carbon Monoxide Over an Alumina Supported Platinum Catalyst by : S. Tariq Hussain
Download or read book A Kinetic Study of the Reduction of Nitric Oxide by Carbon Monoxide Over an Alumina Supported Platinum Catalyst written by S. Tariq Hussain and published by . This book was released on 1988 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catalytic Reduction of Nitric Oxide with Carbon Monoxide by : Yu Sim Ng
Download or read book Catalytic Reduction of Nitric Oxide with Carbon Monoxide written by Yu Sim Ng and published by . This book was released on 1965 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Catalytic Decomposition of Nitric Oxide at the Surface of Platinum by : Thomas Edward Green
Download or read book The Catalytic Decomposition of Nitric Oxide at the Surface of Platinum written by Thomas Edward Green and published by . This book was released on 1926 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Adsorption and Reaction of Carbon Monoxide and Nitric Oxide on a Platinum-rhodium Alloy Surface by : François Jacques Marie Rutten
Download or read book Adsorption and Reaction of Carbon Monoxide and Nitric Oxide on a Platinum-rhodium Alloy Surface written by François Jacques Marie Rutten and published by . This book was released on 2000 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reactivity of Nitric Oxide on Catalytic Surfaces by : Kenneth Jin Lim
Download or read book Reactivity of Nitric Oxide on Catalytic Surfaces written by Kenneth Jin Lim and published by . This book was released on 1987 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 1991 with total page 2682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Oxidation of Carbon Monoxide on Platinum Catalysts by : William Reginald Choate Graham
Download or read book Oxidation of Carbon Monoxide on Platinum Catalysts written by William Reginald Choate Graham and published by . This book was released on 1990 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interaction and Reactivity of Nitric Oxide and Carbon Monoxide on Ruthenium Surfaces by :
Download or read book Interaction and Reactivity of Nitric Oxide and Carbon Monoxide on Ruthenium Surfaces written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A multifaceted investigation of the reduction of nitric oxide by carbon monoxide using a ruthenium (102) single crystal catalyst in the pressure range 10/sup -3/ to 10 Torr and temperature range of 300 to 475/sup 0/C has been undertaken. Kinetic and isotopic results indicate that the reaction products CO/sub 2/ and N/sub 2/ were produced via two reaction mechanisms. Using a reducing gas mixture (low P/sub NO//P/sub CO/ ratio) a two site mechanism was operative involving NO dissociation. The carbon monoxide kinetic order varied from +1 to -3 and the nitric oxide order varied from +1 to 0. The catalyst under these conditions was determined to be metallic ruthenium with oxygen bonded within the first surface layer. The oxygen was unreactive and formed a (1 x 3)-0 LEED pattern. Under oxidizing conditions (high P/sub NO//P/sub CO/ ratio) the catalyst was ruthenium dioxide and the functional mechanism under these reaction conditions yielded a nitric oxide order of +2 to -4. Inclusion of a site poisoning mechanism under reducing conditions and an RuO/sub 2/ growth mechanism involving ruthenium cation transfer under oxidizing conditions into the kinetic rate laws led to an overall rate law which could be fit to the carbon monoxide and nitric oxide order plots. Using isotopically oxygen labelled reactants, it was observed that the three possible isotopes of carbon dioxide were produced. A .gamma.-CO surface species is postulated as an intermediate in the exchange process. The reaction was observed to be initially surface structure insensitive and the reaction kinetics were derived using a Langmuir-Hinshelwood formalism.
Download or read book Coal Abstracts written by and published by . This book was released on 1990 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Activation of Catalysts by : Willard Alexander Whitesell
Download or read book The Activation of Catalysts written by Willard Alexander Whitesell and published by . This book was released on 1923 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
