Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect

Melih GÜLER; Dilek VARIŞLI

doi:https://doi.org/10.3906/kim-1907-4

Makale detayları

Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect

Yazarlar:

Melih GÜLER | Dilek VARIŞLI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2020 Vol.44 Issue 2, pp.309-324

Belge Tipi:

Makale

Yayın Tarihi:

2/2020

Belge Dili:

İngilizce

Document ID (Org No.):

2000725419

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

DOI:

https://doi.org/10.3906/kim-1907-4

Özet:

 

In this study, microwave-assisted ammonia decomposition reaction was investigated over molybdenum incorporated catalysts. Due to the selective, volumetric, and noncontact heating properties of the microwave system, higher conversion values could be achieved at relatively lower reaction temperatures, which is important for on-site COx-free hydrogen production. Multiwall carbon nanotube-supported molybdenum catalysts were prepared following the impregnation procedure with different metal loading  3.5%-12.5% wt% , and inductively coupled plasma, nitrogen physisorption, X-ray diffraction, and transmission electron microscopic techniques were employed to characterize the fresh and used samples. Reaction experiments were performed under the flow of pure ammonia with a gas hourly space velocity of 36,000 mL/gcat.h for both the microwave and conventionally heated reaction systems. It was found that ammonia conversion was obtained even at 400 °C, reaching 40%, and total conversion was observed even at 450 °C, while the activities of these catalysts were negligible at a reaction temperature lower than 550 °C, in the conventional heatedsystem, whichincludedanelectricallyheatedfurnace. Crystalsof α-Mo2CaswellasMoO2 wereobservedinthe structures of the synthesized catalysts and the formation of nitride species was more easily observable under microwave heating, possibly due to the nitridation of molybdenum carbide species during the reaction.

Makale detayları

Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect

Yazarlar: Melih GÜLER | Dilek VARIŞLI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2020 Vol.44 Issue 2, pp.309-324

Belge Tipi: Makale

Yayın Tarihi: 2/2020

Belge Dili: İngilizce

Document ID (Org No.): 2000725419

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

DOI: https://doi.org/10.3906/kim-1907-4

Sayı

Yazarlar:

Melih GÜLER | Dilek VARIŞLI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2020 Vol.44 Issue 2, pp.309-324

Belge Tipi:

Makale

Yayın Tarihi:

2/2020

Belge Dili:

İngilizce

Document ID (Org No.):

2000725419

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

DOI:

https://doi.org/10.3906/kim-1907-4