Chemical looping dry reforming of benzene as a gasification tar model compound with Ni- and Fe-based oxygen carriers in a fluidized bed reactor. (11th October 2018)

• Record Type: Journal Article
• Authors: Nam, Hyungseok; Wang, Zhouhong; Shanmugam, Saravanan R.; Adhikari, Sushil; Abdoulmoumine, Nourredine
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 41(2018)
• Page Start: 18790
• Page End: 18800
• Publication Date: 2018-10-11
• Subjects: Fluidized bed -- Nickel -- Benzene -- Dry reforming -- Chemical looping -- Gasification tar; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2018.08.103
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Gasification tar during a fluidized bed operation impedes syngas utilization in downstream applications. Among tar constituents sampled during biomass gasification, benzene was the most abundant species. Thus, benzene was used as a model compound for chemical looping dry reforming (CLDR) over iron (Fe) and nickel (Ni) metals impregnated on silicon carbide (SiC) in a lab-scale fluidized bed reactor to convert it into hydrogen and carbon monoxide (H2 and CO). A high benzene conversion rate (>90%) was observed at a higher experimental temperature (above 730 °C). Catalytic conversion of benzene using NiFe/SiC catalyst resulted in higher H2 production whereas higher levels of CO were produced with Fe/SiC catalyst at an elevated temperature. Control experiments using an empty bed and SiC bed showed the formation of both the biphenyls and excessive carbon deposits. Air oxidation was also performed for the regeneration of oxygen carrier during the chemical looping operation. Highlights: Chemical looping dry reforming of benzene was performed in a fluidized bed reactor. Iron and nickel based oxygen carriers were used for benzene cracking. Dry reforming of benzene showed H2 /CO selectivity ranged from 0.25 to 0.45. Over 95% of benzene was converted with a NiFe/SiC oxygen carrier.