Recent Advances in Heterogeneous Catalysis for Ammonia Synthesis

Marakatti, Vijaykumar S.; Gaigneaux, Éric M.

doi:10.1002/cctc.202001141

Cited by 107 publications

(90 citation statements)

References 183 publications

(491 reference statements)

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“…[16] Promisingly, recent research on ruthenium-based catalysts addresses these issues by support or promoter changes. [17] Simultaneously, other metals indicated by the volcano curve were tested and proved to show considerable activity when properly prepared and augmented. [5] Cobalt, which at first was used as iron [18,19] or molybdenum dopant in bimetallic catalysts, [20] evolved to standalone active phase.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Flash Calcination Method on the Characteristics of Cobalt Catalysts for Ammonia Synthesis Process

et al. 2021

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The influence of precursor calcination method on the properties of the cerium and barium promoted cobalt catalysts for ammonia synthesis was investigated. Three methods of cobaltcerium hydroxycarbonates mixture heat treatment were studied -flash, static and semi-static calcination processes, differing in duration as well as heat and mass transfer conditions. Their effect on catalyst structural parameters, morphology, crystal structure and activity was determined. It was proven that compared to other heat treatment methods flash calcination of CoCe hydroxycarbonate precursor resulted with a catalyst of superior structural parameters and the highest activity in ammonia synthesis. However, the incomplete precursor transformation and insufficient active and promoter phases crystallization during this process were indicated. In order to improve surface activity and optimise properties of the catalyst it was stated that modification of flash calcination conditions is required.

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Section: Introductionmentioning

confidence: 99%

On the Effect of Flash Calcination Method on the Characteristics of Cobalt Catalysts for Ammonia Synthesis Process

et al. 2021

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“…A variety of alternative catalytic materials and systems have been explored for NH 3 synthesis. [8][9][10][11] Lithium (Li), in particular, has been considered to hold the key to NH 3 production at ambient pressure. [6,[12][13][14][15] Li has an extremely low work function and therefore a high reactivity for N 2 activation which is typically the rate-determining step in NH 3 production.…”

Section: Introductionmentioning

confidence: 99%

Lithium‐based Loop for Ambient‐Pressure Ammonia Synthesis in a Liquid Alloy‐Salt Catalytic System

et al. 2021

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The Haber‐Bosch process for ammonia (NH3) production in industry relies on high temperature and high pressure and is therefore highly energy intensive. In addition, the activity of the solid transition metal‐based catalysts used is typically limited by the scaling relation between activation barrier for N2 dissociation and nitrogen‐binding energy. Here, an innovative Li‐based loop in a liquid alloy‐salt catalytic system for ambient‐pressure NH3 synthesis from N2 and H2 was developed. The looping process consisted of three reaction steps taking place simultaneously. The first step was the nitrogen fixation by Li in the liquid Li−Sn alloy to form lithium nitride (Li3N), which floated up and dissolved into the molten salt. The second step was the hydrogenation of the Li3N to produce NH3 and lithium hydride (LiH) in the molten salt. The third step was the decomposition of the LiH to regenerate Li in the presence of Sn. An average NH3 yield rate of 0.025 μg s−1 was achieved in an 81 h test at 510 °C and ambient pressure. The floating and dissolution of Li3N realized in the liquid catalytic system enabled circumventing the scaling relation exerted on Li, and the remarkable properties of liquid alloy and molten salt offered extraordinary advantages for NH3 synthesis at ambient pressure.

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“…Because of their high activity and long lifespan, Co catalysts are suitable catalyst systems for NH 3 synthesis. 5,6,[20][21][22][23][24] Recently, we revealed that a Bapromoted cobalt catalyst supported on magnesium-lanthanum mixed oxide is an efficient catalyst for ammonia synthesis. 23 The study investigated the kinetics of NH 3 synthesis over the Bapromoted cobalt catalyst and a well-known iron catalyst under various reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis

et al. 2021

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Recent Advances in Heterogeneous Catalysis for Ammonia Synthesis

Abstract: Scheme 1. Electron flow transfer from promoter, support to B 5 active site of Ru and then to π* orbital of N 2 with reduced bond order as seen from the Molecular orbital diagram.

Cited by 107 publications

References 183 publications

On the Effect of Flash Calcination Method on the Characteristics of Cobalt Catalysts for Ammonia Synthesis Process

On the Effect of Flash Calcination Method on the Characteristics of Cobalt Catalysts for Ammonia Synthesis Process

Lithium‐based Loop for Ambient‐Pressure Ammonia Synthesis in a Liquid Alloy‐Salt Catalytic System

A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis

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