Experimental investigations of hydrogen production from CO catalytic conversion of tar rich syngas by biomass gasification

Simeone Chianese, Silvester Fail, Matthias Binder, Reinhard Rauch, Hermann Hofbauer, Antonio Molino, Alessandro Blasi, Dino Musmarra

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Abstract

In this paper, the activity of a cobalt/molybdenum (Co/Mo) commercial catalyst for the Water Gas Shift Reaction for hydrogen production was investigated in a three fixed-bed reactor pilot plant using a tar-rich synthesis gas from a full-scale biomass gasification plant as feed-stream. A parametric variation study was carried out to assess CO conversion (XCO) and selectivity for the water gas shift reaction as a function of the operating temperature (T) in the range 300–450 °C. The effects of four dry gas hourly space velocities (GHSV), Case A-Case D, two steam to dry synthesis gas ratios (H2O/SG), 56% v/v and 67% v/v, and a H2S concentration in the range 100–220 ppmv,dbwere investigated: the highest CO conversion (∼95%) was observed in the base case (Case A GHSV) at 67% v/v H2O/SG, and 450 °C, the lower the operating temperature the lower the CO concentration, the lower the gas hourly space velocity the higher the CO conversion and the higher the H2O/SG the higher the CO conversion. The effect of H2S variation on CO conversion was also studied, keeping the operating temperature constant (≈365 °C) and using the Case D GHSV: CO conversion increased as the H2S concentration increased and XCO ≈ 40%. Selectivity was not influenced by the parameters investigated. Finally, the effect of the catalyst on tar removal was studied and a CO conversion close to 85% was found.
Original languageEnglish
Pages (from-to)182 - 191
Number of pages10
JournalCatalysis Today
DOIs
Publication statusPublished - 15 Nov 2016

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

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