Two-Stage Catalytic Abatement of N2O Emission in Nitric Acid Plants

Inger, Marek; Moszowski, Bartosz; Ruszak, Monika; Rajewski, Jakub; Wilk, Marcin

doi:10.3390/catal10090987

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…In contrast, at the highest temperature, i.e., 850 • C, the Co3.5La is significantly more active than the undoped catalyst. Two recent interesting studies on high temperature N 2 O decomposition have shown the significance of parameters such as extrudate size [25] and pressure [27] on N 2 O decomposition. In fact, in measurements carried out at 890 • C with the commercial catalyst [25] it was found that an increase of diameter of the extrudates leads to a decrease of conversions of N 2 O from approx.…”

Section: ) and Lacoo3mentioning

confidence: 99%

“…Two recent interesting studies on high temperature N2O decomposition have shown the significance of parameters such as extrudate size [25] and pressure [27] on N2O decomposition. In fact, in measurements carried out at 890 °C with the commercial catalyst [25] it was found that an increase of diameter of the extrudates leads to a decrease of conversions of N2O from approx. 80% for 2 mm diameter to 60% for 5 mm extrudates.…”

Section: ) and Lacoo3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The decomposition of nitrous oxide, whose main industrial source is nitric acid plants, continues to be a topic investigated by several research groups [24][25][26]. Catalytic decomposition seems to be the best available solution and preferably as a second stage directly downstream of the platinum-rhodium gauze in the high-temperature zone [25,27]. It has been reported in literature that the activity of catalysts for the decomposition of nitrous oxide is reduced by the addition of water vapor to the reaction mixture [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Co3O4 and LaCoO3 Interaction by Performing N2O Decomposition Tests under Co3O4-CoO Transition Temperature

et al. 2021

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The research presented in this paper addresses the question: How does the addition of a small amount of LaCoO3 impact the activity of a Co3O4 catalyst? By testing such a catalyst in N2O decomposition under conditions at which the thermal decomposition of Co3O4 to CoO is possible, one gains unique insight into how the two phases interact. The activity of such a catalyst increases in the entire studied temperature range, unlike the activity of the undoped cobalt catalyst which is lower at 850 °C than at 800 °C due to the reduction of Co3O4 to CoO. XRD measurements showed that CoO was also the main cobalt oxide present in the Co3.5La catalyst after operating at 850 °C, as did the XPS measurements, but there was no drop of activity associated with this change. The influence of NO, O2 and H2O on the activity of the new catalyst, Co3.5La, was determined. Lack of positive effect of NO, a known oxygen scavenger, on the activity was noticed at all temperatures, showing that the effect of LaCoO3 is probably due to increased oxygen desorption. Temperature programed oxidation (TPO) tests showed that the beneficial effects of the presence of LaCoO3 on the activity of cobalt oxide at 850 °C were probably caused by enhanced diffusion of O2− anions through the entire catalyst, which facilitates desorption of oxygen molecules from the surface.

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Section: ) and Lacoo3mentioning

confidence: 99%