The effect of iron nanocrystallites’ size in catalysts for ammonia synthesis on nitriding reaction and catalytic ammonia decomposition

• Authors: Rafał Pelka , Karolina Kiełbasa , Walerian Arabczyk
• Languages of publication: EN

Abstracts

EN

Iron catalyst for ammonia synthesis of various mean sizes of iron nanocrystallites were nitrided with ammonia in a differential reactor equipped with systems that made it possible to conduct both thermogravimetric measurements and hydrogen concentration analyses in the reacting gas mixture. The nitriding process was investigated under atmospheric pressure at the temperature of 475°C. It was found that along with an increase of mean size of iron nanocrystallites, with a decrease of specific surface area of the samples, nitriding degree of solid samples increased. At the same time the rate of surface reaction of catalytic ammonia decomposition decreased. Along with an increase of the samples’ specific surface area an increase of the catalyst’s activity was observed. However, it was also observed that the concentration of active sites on the catalysts’ surface decreased along with an increase of specific surface area.

Keywords

EN

Nitriding reaction; Catalytic ammonia decomposition; Nanocrystalline iron; Nanocrystallites’ size; Active surface area

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2011
• Volume: 9
• Issue: 2
• Pages: 240-244

Dates

published

1 - 4 - 2011

online

17 - 2 - 2011

Contributors

author

Rafał Pelka

• Institute of Chemical and Environment Engineering

author

Karolina Kiełbasa

• Institute of Chemical and Environment Engineering

author

Walerian Arabczyk

• Institute of Chemical and Environment Engineering

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Identifiers

DOI

10.2478/s11532-010-0145-5