Co-solvent effects on hydrothermal co-gasification of coal/biomass mixtures for hydrogen production

HASANOĞLU A., Faki E., SEÇER A., Uzden Ş.

FUEL, cilt.331, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 331
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.fuel.2022.125693
  • Dergi Adı: FUEL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Biotechnology Research Abstracts, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
  • Anahtar Kelimeler: Coal, Sorghum mixtures, Co -solvent, Gasification, Hydrogen, SUPERCRITICAL WATER GASIFICATION, STEAM-GASIFICATION, BIOMASS GASIFICATION, SOLVENT-EXTRACTION, METAL CATALYSTS, ALKALI, TEMPERATURE, COALS, SUGAR, DESULFURIZATION
  • Çukurova Üniversitesi Adresli: Evet

Özet

The use of low-rank coals for hydrogen production by gasification can create advantageous options to overcome a potential energy crisis. In this study, the effects of 8 different solvents on gasification and hydrogen yield in coal/biomass co-solvent hydrothermal gasification were investigated. The most effective co-solvent on product conversion and high hydrogen yield was found N-methyl pyrrolidone (NMP) and tetrahydrofuran (THF). Total gas volumes and hydrogen yields obtained from the co-solvent gasification of coal/sorghum blends were higher than the arithmetical sum of the average values of the yields from individual solvent and coal/sorghum blend gasifications. The increase in the hydrogen yield was 11 mol H-2/kg feed with the co-solvent THF due to the synergistic effects of THF on hydrogen production. Solvent concentration was effective on both total gas volumes and hydrogen yields. In the catalytic (K2CO3/CaO) runs with a concentration of 20 % (v/v) NMP co-solvent 98.8 +/- 0.1 mol H-2/kg feed was achieved with a dramatic decrease of CO content in the produced gas mixture. The comparison of the results obtained from subcritical and supercritical water conditions showed that in catalytic processes co-solvent was more effective towards feedstock conversion and almost the same hydrogen yields obtained at lower pressures under the subcritical water conditions.