H<sub>2</sub> production from H<sub>2</sub>S over activated carbon prepared at different carbonization temperatures as efficient microwave catalyst

DOĞAN M. Y., YAŞYERLİ S., TAŞDEMİR H. M., ARBAĞ H., YAŞYERLİ N.

RENEWABLE ENERGY, cilt.256, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 256
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1016/j.renene.2025.124191
  • Dergi Adı: RENEWABLE ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, Environment Index, Geobase, Greenfile, Index Islamicus, INSPEC, Public Affairs Index
  • Gazi Üniversitesi Adresli: Evet

Özet

This study aims to prepare activated carbon (AC) using sawdust as a stable and active microwave catalyst for H2 production from H2S. The AC, including mesoporous, was prepared at different carbonization temperatures (AC1:800 degrees C, AC2:900 degrees C, AC3:1000 degrees C). AC3 exhibited the highest sp2/sp3 ratio, tc-tc* transitions and mesoporosity, facilitating efficient microwave interaction and resulting in more irradiation absorption. High and similar H2 production rates using AC1, AC2, and AC3 in the microwave-heated reactor (MWHR) were obtained at different reaction temperatures. The H2 production rate obtained with AC3 at average reaction temperatures of 700 degrees C, 800 degrees C, and 900 degrees C are 13, 14, and 18 mmolx10-3/min, respectively. However, the carbonization temperature played a crucial role in H2 production per the microwave energy absorption of catalysts in MWHR. This situation can be attributed to the formation of a high sp2/sp3 ratio and more tc-tc* transitions, which enhance microwave interaction. In the long-term activity test conducted with AC3 in MWHR, stable and efficient H2 production was achieved with 14 mmolx10-3/min at an average reaction temperature of. 726 degrees C for 530 min. AC3, with superior catalytic performance, is a promising candidate for H2 production via microwave-assisted H2S decomposition.