Conversion of ammonia to hydrogen in the microwave reactor system using Mo@Alumina catalysts with the promotion of rare-earth and alkaline earth elements

Zehra Nur Yildiz and Dilek Varisli

Renewable Energy, 2024, vol. 228, issue C

Abstract: In this study, microwave assisted ammonia decomposition reaction to produce high purity hydrogen over γ-Al2O3 supported molybdenum based catalysts were investigated and the effects of various promoters, rare-earth (lanthanum, cerium) and alkaline-earth (calcium and barium) elements on the catalytic activity were studied. Ammonia conversions of over 94 % were obtained over the unpromoted catalysts above 350 °C at a flow rate of 60 ml/min of pure ammonia. The overall hydrogen production rate per gram of catalyst was found to be 72.86 mmol/min.gcat with for 30 wt% Mo loaded unpromoted catalyst at 350 °C. The apparent activation energy (Ea) values for these catalysts were found to be around 85 kJ/mol. Among the promoters, Ba and Ce gave better performance below 350 °C than Ca and La and the optimum loading was found to be 4 wt% for them. Neither molybdenum nitride nor molybdenum carbide were detected in the spent form of the catalysts.

Keywords: Microwave reactor; Hydrogen; Ammonia; Molybdenum; Promoter; Alumina (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:228:y:2024:i:c:s0960148124006712

DOI: 10.1016/j.renene.2024.120603

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