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Elevated temperature pressure swing adsorption using LaNi 4.3 Al 0.7 for efficient hydrogen separation

International Journal of Hydrogen Energy, ISSN: 0360-3199, Vol: 46, Issue: 1, Page: 697-708
2021
  • 19
    Citations
  • 0
    Usage
  • 37
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    19
    • Citation Indexes
      19
  • Captures
    37

Article Description

The application of LaNi 5 based alloys as adsorbent for hydrogen separation and purification has been proposed for a long time. However, the actual utilization is limited by the poor CO tolerance of the alloys at atmospheric temperature. In this study, an elevated temperature vacuum pressure swing adsorption (ET-VPSA) method for H 2 separation using hydrogen storage material LaNi 4.3 Al 0.7 is proposed and demonstrated to be energy efficient. Elevating the working temperature results in improved CO tolerance of LaNi 4.3 Al 0.7, making it possible for the alloy to be used in more situations. An ET-VPSA model was built to explore the correlations between product H 2 purity, recovery rate, feed gas composition, cycle duration and counter-current blow down (CD) pressure. The results show that H 2 recovery rate of ET-VPSA reaches 95% while it is usually 85% or lower for regular pressure swing adsorption (PSA). The energy efficiency of these two separation methods is evaluated by methanol reforming-proton exchange membrane fuel cell system models which contain PSA or ET-VPSA as H 2 purification unit. A larger net power generation amount indicates less energy loss during H 2 purification process. Although the vacuum pump will lead to extra energy consumption, benefiting from higher H 2 recovery rate, the net efficiency of the system with ET-VPSA is 0.475, still higher than that with PSA (0.448).

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