Investigation on the catalysis of COx-free hydrogen generation from ammonia

Shuang Feng Yin, Qin Hui Zhang, Bo Qing Xu*, Wen Xia Zhu, Ching Fai Ng, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

295 Citations (Scopus)

Abstract

The effects of active component (Ru, Rh, Pt, Pd, Ni, Fe) and support (CNTs, AC, Al2O3, MgO, ZrO2, TiO2) on the catalysis of ammonia decomposition were studied for the generation of CO x-free hydrogen. It was shown that the Ru catalyst using CNTs as support exhibits the highest conversion of NH3. The performance can be further improved by modifying CNTs with KOH. According to the results of XRD, TEM, and chemisorption (CO and H2 as adsorbates) investigations, Ru dispersion is the highest on CNTs. In the range of 2-5 nm, the particle size of Ru on CNTs is the smallest among the supported Ru catalysts; the Ru particles on the metal oxides are in the 3-16 nm range. It seems that larger Ru particles are more active for NH3 decomposition in terms of TOF. Further investigation on the relationship between support basicity and catalytic activity disclosed that a support material of strong basicity is essential for high catalytic performance. In the N2-TPD studies of supported Ru catalysts, desorption was promoted over catalysts of strong basicity, suggesting that N2 desorption is the rate-determining step in ammonia decomposition. These results implied that it is possible to develop a highly efficient Ru catalyst for NH3 decomposition by using electron-conductive materials of strong basicity as support.

Original languageEnglish
Pages (from-to)384-396
Number of pages13
JournalJournal of Catalysis
Volume224
Issue number2
DOIs
Publication statusPublished - 10 Jun 2004

Scopus Subject Areas

  • Catalysis
  • Physical and Theoretical Chemistry

User-Defined Keywords

  • Ammonia decomposition
  • Basicity
  • Carbon nanotubes
  • Hydrogen generation
  • Nanocatalysis
  • Ruthenium

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