Über die kinetischen Instabilitäten bei der CO‐Oxidation an Platin‐Katalysatoren

Keil, Werner; Wicke, E.

doi:10.1002/bbpc.19800840417

Cited by 62 publications

(7 citation statements)

References 15 publications

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“…This is roughly the same magnitude as given in the literature (Hausser and Luft, 1980). A similarity exists between the transient response for this system and the kinetics of the linear (ignited) portion and the non-linear (quenched) portion for CO oxidation (Keil and Wicke, 1980). Since no selectivity questions occur in the latter system, the observations discussed above suggest that the different conditions identified on the catalyst surface could arise from different reaction mechanisms.…”

Section: Loss Of Selectivitysupporting

confidence: 82%

“…Since no selectivity questions occur in the latter system, the observations discussed above suggest that the different conditions identified on the catalyst surface could arise from different reaction mechanisms. The induction phase, discussed in the previous section, seems then to correspond to the surface reorganization phase of CO oxidation (Keil and Wicke, 1980). Moreover, it is conceivable that at low conversions, the partial oxidation system could exhibit isothermal oscillation.…”

Section: Loss Of Selectivitymentioning

confidence: 84%

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Investigation of the catalytic oxidation of benzene to maleic anhydride by wave front analysis with respect to the application of periodic operation

et al. 1983

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A kinetic analysis of the partial oxidation of benzene to maleic anhydride over a Merck, Sharp and Dohme developed V2O5‐MoO3/TiO2 catalyst shows that partial oxidation proceeds through surface reduction, induction and collapse phases. In each, surface species and reactions are different. The reduction/induction phases correspond to a “ignited” state whereas the collapse phase is similar to an extinguished state familiar in the catalytic oxidation of CO. Selectivity to maleic anhydride is lower in the extinguished state. Periodic operation should offer a means to keep selectivity high provided the cycle period does not exceed just a few minutes. Improvement in selectivity of close to 100% has been attained by periodic switching of the feed composition between mixtures containing oxygen and benzene in ratios of 2.4 and 4.6 with periods between 1/2 and 6 minutes. Benzene conversion, however, is lower.

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Section: Loss Of Selectivitysupporting

confidence: 82%

Section: Loss Of Selectivitymentioning

confidence: 84%

Investigation of the catalytic oxidation of benzene to maleic anhydride by wave front analysis with respect to the application of periodic operation

et al. 1983

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“…These oscillations have been ascribed to a reversible COblocking mechanism [43,44]. However, the most widely accepted model for oscillatory CO oxidation on polycrystalline Pt, Pd and Ir catalysts has been proposed by Sales, Turner, and Maple [4,[44][45][46].…”

Section: Oscillatory Reaction At Atmospheric Pressurementioning

confidence: 98%

Bistability and oscillations in CO oxidation studied with scanning tunnelling microscopy inside a reactor

2005

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“…While the adsorbate induced self-organization of a well-order single crystal surface may be conceptually acceptable, it is surprising that oscillations have been observed in the oxidation of CO over supported Pt catalysts [6] and in the oxidation of CH 3 OH over polycrystalline Cu foil [7].…”

Section: Introductionmentioning

confidence: 99%

Temporal and Oscillatory Behavior Observed during Methanol Synthesis on a Cu/ZnO/Al2O3 (60:30:10) Cata

Al-Dosari¹

2021

GSC

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The rate of Methanol synthesis over a Cu/ZnO/Al 2 O 3 (60:30:10) catalyst has been measured using CO 2 /H 2 (10:90) and CO/CO 2 /H 2 (10:10:80) streams at 433, 443, 453, 463 and 473 K. Using the CO 2 /H 2 stream, it requires 12 × 10 3 s to achieve steady-state performance; this time reduces to 5.4 × 10 3 s on increasing the temperature to 463 K. Using the CO/CO 2 /H 2 stream, steady State performance is not achieved even after 14.4 × 10 3 s at 433 K but is achieved after 9 × 10 3 s at 463 K. Significant deviations from steady state behavior (~40% of steady state) are observed only at 453 K and only using the CO 2 /H 2 feed when gas chromatography (GC) is the analysis system. When the reactor output is connected directly into a flame ionization detector (FID), oscillation is observed at all temperatures studied using a CO 2 /H 2 stream. Injection of CO into the CO 2 /H 2 stream, which is synthesizing methanol at 473 K, produces a sharply spiked increase in the rate of methanol synthesis followed by an oscillatory relaxation to steady state behavior. At 433 and 443 K, the injection of CO into the CO 2 /H 2 stream again produces the sharply spiked increase in the rater of methanol synthesis, which returns to the baseline value without oscillations.

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Über die kinetischen Instabilitäten bei der CO‐Oxidation an Platin‐Katalysatoren

Cited by 62 publications

References 15 publications

Investigation of the catalytic oxidation of benzene to maleic anhydride by wave front analysis with respect to the application of periodic operation

Investigation of the catalytic oxidation of benzene to maleic anhydride by wave front analysis with respect to the application of periodic operation

Bistability and oscillations in CO oxidation studied with scanning tunnelling microscopy inside a reactor

Temporal and Oscillatory Behavior Observed during Methanol Synthesis on a Cu/ZnO/Al<sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O</span><sub><span style="font-family:Verdana;">3</span></sub><span style="font-family:Verdana;"> (60:30:10) Cata

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