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

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  • Yildiz, Zehra Nur
  • Varisli, Dilek

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.

Suggested Citation

  • Yildiz, Zehra Nur & Varisli, Dilek, 2024. "Conversion of ammonia to hydrogen in the microwave reactor system using Mo@Alumina catalysts with the promotion of rare-earth and alkaline earth elements," Renewable Energy, Elsevier, vol. 228(C).
    • Handle: RePEc:eee:renene:v:228:y:2024:i:c:s0960148124006712
    DOI: 10.1016/j.renene.2024.120603
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    References listed on IDEAS

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    1. Sun, Shangcong & Jiang, Qiuqiao & Zhao, Dongyue & Cao, Tiantian & Sha, Hao & Zhang, Chuankun & Song, Haitao & Da, Zhijian, 2022. "Ammonia as hydrogen carrier: Advances in ammonia decomposition catalysts for promising hydrogen production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 169(C).
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