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Abstract <p>The focus on green energy requires the search for environmentally friendly energy storage systems. The choice of ammonia as a potential container for hydrogen is attributed to the high energy content in it and the absence of carbon and nitrogen oxide emissions during decomposition. In this study, Co–Al<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> ammonia decomposition catalysts activated by the different methods, namely, cyclic reduction–carburization–reduction (RCR) and reduction–oxidation–reduction (ROR) procedures, have been tested and compared with a catalyst subjected to the conventional reduction of cobalt with hydrogen (R). The samples have been characterized by H<sub>2</sub>-TPR, TEM, and XRD using synchrotron radiation; the studies have shown the invariance of the structural properties of the catalysts during reaction. Since the activity and effective activation energy values of the studied catalysts are similar, catalyst R characterized by the simplest synthesis procedure has been chosen for a long-term test, where it has exhibited high on-stream stability.</p>

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Ammonia Decomposition in the Presence of Co–Al2O3/SiO2 Catalysts: Effect of Cobalt Reduction Methods

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • R. E. Yakovenko,
  • T. V. Krasnyakova,
  • A. N. Saliev,
  • R. D. Svetogorov,
  • V. N. Soromotin,
  • A. V. Volik,
  • A. P. Savost’yanov,
  • S. A. Mitchenko

摘要

Abstract

The focus on green energy requires the search for environmentally friendly energy storage systems. The choice of ammonia as a potential container for hydrogen is attributed to the high energy content in it and the absence of carbon and nitrogen oxide emissions during decomposition. In this study, Co–Al2O3/SiO2 ammonia decomposition catalysts activated by the different methods, namely, cyclic reduction–carburization–reduction (RCR) and reduction–oxidation–reduction (ROR) procedures, have been tested and compared with a catalyst subjected to the conventional reduction of cobalt with hydrogen (R). The samples have been characterized by H2-TPR, TEM, and XRD using synchrotron radiation; the studies have shown the invariance of the structural properties of the catalysts during reaction. Since the activity and effective activation energy values of the studied catalysts are similar, catalyst R characterized by the simplest synthesis procedure has been chosen for a long-term test, where it has exhibited high on-stream stability.