Catalytic hydrogen production from municipal sludge in supercritical water with partial oxidation

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Abstract

This paper describes partial oxidative gasification of municipal sludge with NaOH catalyst, using a batch type reactor. Hydrogen peroxide was employed as oxygen source. The reaction is studied in the ranges of 623-723 K, 23-28 MPa and various reaction time 5-40 min. We found that sludge at low concentrations can be completely gasified and no char or tar was observed. Gaseous products were composed of H2, CO2, CO, CH4, and so on. The improvement of gasification efficiency by partial oxidation was accompanied with high yield of hydrogen and carbon monoxide. The effect of partial oxidation was investigated. For comparison, we also conducted the experiments without catalyst at the same conditions. The yield of hydrogen with NaOH was almost twice as much as that without catalyst. Thus, a base catalyst has a positive effect on partial oxidation of sludge to produce H2. The catalytic effect of NaOH was the inhibition of char formation and promotion of CO yields and thus H2 by water-gas shift reaction.

Original languageEnglish
Title of host publicationChallenges on Power Engineering and Environment - Proceedings of the International Conference on Power Engineering 2007, ICOPE 2007
EditorsFei Wang, Kefa Cen, Yong Chi
PublisherZhejiang Univ Press
ISBN (Electronic)9787308055956
StatePublished - 2007
EventInternational Conference on Power Engineering 2007: Challenges on Power Engineering and Environment, ICOPE 2007 - Hangzhou, China
Duration: 23 Oct 200727 Oct 2007

Publication series

NameChallenges on Power Engineering and Environment - Proceedings of the International Conference on Power Engineering 2007, ICOPE 2007

Conference

ConferenceInternational Conference on Power Engineering 2007: Challenges on Power Engineering and Environment, ICOPE 2007
Country/TerritoryChina
CityHangzhou
Period23/10/0727/10/07

Keywords

  • Base catalyst
  • Hydrogen production
  • Partial oxidation
  • Sewage sludge
  • Supercritical water

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