A study of iron catalyst for ammonia synthesis by electron spectroscopy methods

Arabczyk, W.; Moszyński, Dariusz; Dłużewska, Magdalena

doi:10.2478/v10063-010-0006-2

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…In opposition to the periodic trend discussed above, some sources refer to potassium as the best alkali metal promoter for the technical H-B catalyst [28, 58]. Using the double-layer model presented above (Figure 2), the valence of the promoter cation and its ionic radius are expected to affect the density of open Fe active sites for N 2 chemisorption; thus, changing the alkali cation has both electronic and structural consequences.…”

Section: Introductionmentioning

confidence: 99%

Coordination chemistry insights into the role of alkali metal promoters in dinitrogen reduction

Connor

Holland

2017

Catalysis Today

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The Haber-Bosch process is a major contributor to fixed nitrogen that supports the world's nutritional needs and is one of the largest-scale industrial processes known. It has also served as a testing ground for chemists’ understanding of surface chemistry. Thus, it is significant that the most thoroughly developed catalysts for N2 reduction use potassium as an electronic promoter. In this review, we discuss the literature on alkali metal cations as promoters for N2 reduction, in the context of the growing knowledge about cooperative interactions between N2, transition metals, and alkali metals in coordination compounds. Because the structures and properties are easier to characterize in these compounds, they give useful information on alkali metal interactions with N2. Here, we review a variety of interactions, with emphasis on recent work on iron complexes by the authors. Finally, we draw conclusions about the nature of these interactions and areas for future research.

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Section: Introductionmentioning

confidence: 99%

Coordination chemistry insights into the role of alkali metal promoters in dinitrogen reduction

Connor

Holland

2017

Catalysis Today

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“…Catalytic activity tests were performed on the apparatus described elsewhere [33]. Briefly, a tubular flow reactor supplied with a gaseous mixture of N 2 + 3H 2 (330 cm 3 /min) was used.…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

The Influence of Potassium Promotion on the Structural Properties of Cobalt Molybdenum Nitrides in Ammonia Synthesis

et al. 2023

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Cobalt molybdenum nitrides are one of the most promising ammonia-synthesis catalysts of the future. However, the selection of the optimal promoter composition is a challenging task. In this paper, the structure–property relationship of ternary cobalt molybdenum nitrides as ammonia synthesis catalysts promoted with potassium was studied. A series of catalysts containing 0.2–3.5 wt% potassium was analyzed by means of X-ray diffraction, volumetric gas adsorption, and activity tests in ammonia synthesis. The catalysts were subjected to thermal aging in the same catalytical reactor. The influence of the potassium promoter on the thermostability was determined. The observed loss of activity in catalysts with a high potassium content was related to the concentration of Co2Mo3N and Co3Mo3N phases, the mean crystallite sizes, the specific surface area, and the pore size distribution.

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A study of iron catalyst for ammonia synthesis by electron spectroscopy methods

Cited by 2 publications

References 62 publications

Coordination chemistry insights into the role of alkali metal promoters in dinitrogen reduction

Coordination chemistry insights into the role of alkali metal promoters in dinitrogen reduction

The Influence of Potassium Promotion on the Structural Properties of Cobalt Molybdenum Nitrides in Ammonia Synthesis

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