عنوان مقاله:

نویسندگان:

علی جعفری، نیما عالی زاده

Ammonia synthesis reaction from N2 and H2 is composed of several steps. The main role of ammonia synthesis catalyst is to dissociate the N2 bond, because of its high bond energy. It is the heart of the ammonia plant and has a direct effect on the economic benefits of the whole plant, and is thus called an economic catalyst. Wustite-based ammonia synthesis catalyst (WASC) is the new generation ammonia synthesis catalyst that is more highly active than magnetite-based catalyst. It was typically produced by a high-temperature fusion method in which a high-grade magnetite and iron/graphite and promoters are melted followed by cooling, crushing, and sieving. An electrical furnace will be used for melting material above 1800 °C. The usual promoters such as Al, Ca, K, Mg, and Si were used for improving activity, heat resistance, and antitoxic performances. The most important promoter that is effective in the activity (NH3 %) of wustite catalyst is potassium (K) which is named an electronic promoter. It is donated an electron to the anti-bonding N2 bond that is facilitated the dissociation of N2 in the rate-determining step. In this research, some samples of WASC were prepared with various content of K (0.5-2 %), and their activity of them was measured. It was shown that about 1 % K is enough for activity. It was concluded that the high amount of K promoter does not result in high activity.

wustite، ammonia synthesis، potassium، promoter

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جعفری، علی، عالی زاده، نیما، 1402، The effect of potassium promoter on the activity of wustite-based ammonia synthesis catalyst، بیست و دومین کنفرانس شیمی معدنی ایران، https://conference.uok.ac.ir/fa/archive_index.php?c=HN-iicc22&aid=1517651