An experiment study of biomass steam gasification over NiO/Dolomite for hydrogen-rich gas production. (5th January 2017)

• Record Type: Journal Article
• Authors: Zhang, Bo; Zhang, Li; Yang, Zhongqing; He, Zhixia
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 1(2017)
• Page Start: 76
• Page End: 85
• Publication Date: 2017-01-05
• Subjects: NiO -- Gasification -- Dolomite -- Hydrogen; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2016.10.044
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The reactivity of dolomite, limestone and NiO/Dolomite toward hydrogen production during high temperature steam gasification of biomass were evaluated. NiO/Dolomite additive was prepared from impregnation of NiO on dolomite surface. Reactor with gasification bed operated at 900 °C and sorption/reforming bed operated at 730 °C at downstream was applied in this paper. Results show that co-gasification of biomass and additive increased overall gas yield and also the CO2 concentration. With dolomite in the sorption/reforming bed and none additive in gasification bed, the highest hydrogen concentration was achieved (71.8 vol.%). With 2wt.% NiO/Dolomite in the sorption/reforming bed and dolomite in the gasification bed separately, the highest hydrogen yield (510 cm 3 /g) was reached. Further increasing NiO content decreased hydrogen yield, sorption capacity and increased coke deposition. Calcination of NiO/Dolomite at 950 °C led to formation of NiOMgO phase and reduced to NiMgO phase during gasification which increased the catalysis of the additive. Highlights: Gasification bed and sorption/reforming bed were set within one reactor, but at different temperature zone. With additive adding in both beds got the higher hydrogen yield and lower CO2 amount. With 2wt.% of NiO impregnated on dolomite, it got highest hydrogen yield of 510 ml/g. Formation of NiO–MgO was confirmed by XRD, which led to the enhanced catalysis. Ni crystallite size increased with Nickel content, caused the risen of carbon deposition.