Microwave-assisted ammonia decomposition reaction over iron incorporated mesoporous carbon catalysts

Date

2017-02-01

Author

VARIŞLI, DİLEK
Korkusuz, Cansu
Doğu, Timur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

320
views

0
downloads

Microwave-assisted ammonia decomposition reaction was investigated to produce COx free hydrogen, for fuel cell applications. Iron incorporated mesoporous carbon catalysts were prepared at different metal loadings, following an impregnation procedure. Mesoporous carbon acted as the catalyst support, as well as the microwave receptor. Complete conversion of ammonia was achieved at 450 degrees C over the catalyst having 7.7 wt% Fe, when the reaction was carried out in the microwave reactor system, using pure ammonia (GHSV of 36000 ml/h gut). However, in the case of using the conventionally heated reactor, complete conversion of ammonia was achieved only at 600 degrees C. Iron oxides, namely maghemite (gamma-Fe2O3), magnetite (Fe3O4) and hematite (alpha-Fe2O3) simultaneously appeared in the structure of the synthesized catalysts, after their calcination at 450 degrees C, under pure N-2 flow. Iron oxides present in the calcined catalytic materials then were reduced to metallic iron at 500 degrees C. Formation of iron carbide crystals was observed in the structure of spent catalysts that were used in microwave reactor system, while metallic iron crystals were still present in the catalysts that were tested in conventionally heated system.

Subject Keywords

Microwave, Ammonia, Hydrogen, Mesoporous carbon, Iron oxides

URI

https://hdl.handle.net/11511/32396

Journal

APPLIED CATALYSIS B-ENVIRONMENTAL

DOI

https://doi.org/10.1016/j.apcatb.2016.08.032

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Hydrogen production over molybdenum loaded mesoporous carbon catalysts in microwave heated reactor system Guler, Melih; Doğu, Timur; VARIŞLI, DİLEK (2017-12-15) Ammonia decomposition reaction to produce COx free hydrogen over molybdenum incorporated mesoporous carbon based catalysts was studied in a microwave heated reactor system. Mesoporous carbon is acting as the catalyst support as well as the microwave receptor in the reaction medium. While the highest conversion value was 49% in conventionally heated reaction system at 600 degrees C, total conversion value was achieved over the same catalyst at 400 degrees C in microwave heated system with a GHSV of 36,000 ml...
Continuous synthesis of graphite with tunable interlayer distance ÇAKMAK, GÜLHAN; Öztürk, Tayfur (2019-06-01) A study was carried out to produce graphite with controlled interlayer distance synthesized from methane using hydrogen as modifying agent. The synthesis was carried out in radio frequency (r.f.) thermal plasma where the methane-to-hydrogen ratio varied systematically over a wide range. The synthesized materials were investigated in terms of structure, morphology and the interlayer distance. It is found that there is a critical fraction of hydrogen, around half of that of methane flow rate, up to which it i...
Activated carbon-tungstophosphoric acid catalysts for the synthesis of tert-amyl ethyl ether (TAEE) Obali, Zeynep; Doğu, Timur (2008-05-01) Catalytic activities of bulk tungstophosphoric acid (HPW) and its supported forms on activated carbon were investigated in the vapor phase etherification reaction of isoamylene with ethanol in a continuous flow reactor. Tungstophosphoric acid (H3PW12O40 center dot 11H(2)O) was supported on activated carbon having a surface area of 796 m(2)/g, at two different loading levels (25% and 31%) by aqueous impregnation technique and the kinetic experiments were done in a temperature range between 353 and 370 K. Sup...
Hydrogen generation of conventional fuels over mesoporous mixed oxide catalysts under time interrrupted reaction conditions Can, Mukaddes; Üner, Deniz; Yılmaz, Ayşen; Department of Chemical Engineering (2012) In this study, catalytic activity of the Co and/or Pb-SBA-15 mesoporous catalysts in methane partial oxidation reaction was investigated. By using sol-gel, incipient wetness impregnation and post grafting method, SBA-15 samples are incorporated with Co and/or Pb at different weight loadings to provide a controlled geometry in nanometer scale. The characterization of the synthesized samples was done by XRD, N2 adsorption isotherms, FTIR, TEM images, Raman and XPS analysis. In the present study also, gas phas...
Water soluble laurate-stabilized ruthenium(0) nanoclusters catalyst for hydrogen generation from the hydrolysis of ammonia-borane: High activity and long lifetime DURAP, FEYYAZ; Zahmakiran, Mehmet; Özkar, Saim (2009-09-01) The simplest amine-borane, considered as solid hydrogen storage material, ammonia-borane (H(3)NBH(3)) can release hydrogen gas upon catalytic hydrolysis under mild conditions. Herein, we report the preparation of a novel catalyst, water dispersible laurate-stabilized ruthenium(0) nanoclusters from the dimethylamine-borane reduction of ruthenium(III) chloride in sodium laurate solution at room temperature. The ruthenium nanoclusters in average size of 2.6 +/- 1.2 nm were isolated from the solution and well c...

Citation Formats

D. VARIŞLI, C. Korkusuz, and T. Doğu, “Microwave-assisted ammonia decomposition reaction over iron incorporated mesoporous carbon catalysts,” APPLIED CATALYSIS B-ENVIRONMENTAL, pp. 370–380, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/32396.