Kinetics of NH3 oxidation on Pt, Rh, and Pd*1

Pignet, T.; Schmidt, L.D.

doi:10.1016/0021-9517(75)90249-3

Cited by 123 publications

(46 citation statements)

References 8 publications

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“…Ammonia oxidation is used industrially in the production of nitric acid, and constitutes an important step in ammoxidation reactions used to produce nitrogen-bearing compounds for agricultural chemicals and monomers (Satterfield, 1991). The major overall reactions in previously proposed mechanisms (Pignet and Schmidt, 1974;Pignet and Schmidt, 1975) exhaust stream, while the NO and N, peaks increased as they were produced (Figure 9). When the heater power was lowered, the ignited area gradually decreased, the downstream sections extinguishing first, and the upstream section eventually extinguishing at temperatures -300°C.…”

Section: Aiche Journalmentioning

confidence: 88%

Micromachined reactors for catalytic partial oxidation reactions

et al. 1997

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Silicon-based microfabrication of a novel chemical reactor (microreactor) having submillimeter flow channels with integrated heaters, and jlow and temperature sensors is described. The potential application of this reactor to partial-oxidation reactions is explored by using Pt-catalyzed NH, oxidation as a model reaction. Investigation of reactor behavior as a function of operating conditions shows that conversion and selectivity behavior of conventional laboratory reactors can be reproduced and demonstrates the feasibility of conducting chemical reactions in microfabricated systems. Ignitionextinction behavior is explored, along with high-temperature microreactor materials degradation. Potential applications and scale-up of microreactors are also discussed.

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Section: Aiche Journalmentioning

confidence: 88%

Micromachined reactors for catalytic partial oxidation reactions

et al. 1997

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“…Catalytic etching of Pt catalysts during ammonia oxidation was not detected at pressures below 15 Pa even after extended periods of catalyst operation [9,10], an observation confirmed by our recent study on the influence of pressure on structural and catalytic properties of different platinum catalysts [11]. At higher reactant partial pressures (kPa range), the reconstruction of Pt surfaces has been studied during catalytic ammonia oxidation at temperatures above 600 8C on polycrystalline platinum in the shape of wires [4,6,7,12], gauzes [5,13,14], and spheres [15].…”

Section: Introductionmentioning

confidence: 97%

Morphology changes of Pt-foil catalyst induced by temperature-controlled ammonia oxidation near atmospheric pressure

Kraehnert

Baerns

2007

Applied Catalysis A: General

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Reaction-induced changes of the morphology of a Pt foil catalyst during ammonia oxidation were investigated in a temperature-controlled way for partial pressures of oxygen and ammonia around 4.5 and 3 kPa, respectively, and at temperatures between 20 and 700 8C. The presence of the feed mixture (ammonia and oxygen) was required to induce surface roughening. Moreover, the reaction temperature controlled the type of restructuring of the Pt surface, that is, either into rows of parallel facets where facet size increased with temperature, or as bulky microcrystals protruding from the surface. Surprisingly, reaction-induced surface faceting was already observed at 286 8C. Between 286 and 374 8C adsorbateenhanced surface diffusion of Pt is suggested to account for the surface restructuring well below temperatures reported for significant Pt transport through the gas phase via volatile PtO x .

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“…Additionally the observations are supplemented by quantum chemistry [1][2][3]. Based on these results a number of mechanistic models have been developed [4][5][6][7], the most recent one being the mechanism of Krähnert et al [8]. This mechanism forms the basis for our simulation work on NH 3 -slip catalysts.…”

Section: Introductionmentioning

confidence: 97%