In order to enhance biomass conversion technology, a three-stage conversion process for biomass pyrolysis-gasification with applied Zr modified CaO-HZSM-5 catalysts is proposed for hydrogen and bio-oil co-production with CO2 capture. The process is divided into three parts: biomass pyrolysis, steam biochar gasification, and catalyst regeneration with CO2 capture. The Zr modified CaO-HZSM-5 catalysts are prepared using ion exchange and incipient wetness impregnation methods. The bifunctional catalysts were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), energy dispersive X-ray fluorescence (EDXRF), and transmission electron microscopy (TEM). The cycled CaO-Zr-ZSM-5 catalysts were also characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Results indicate that CaO-HZSM-5 catalyst shows the best bio-oil selectivity (56% of phenols and 73% of aromatic compounds determined by GC/MS). Furthermore, higher hydrogen yields and concentration can be obtained using the modified CaO-Zr/H-ZSM-5 catalysts.
Bibliographical noteFunding Information:
The authors gratefully express thanks to the National Natural Science Foundation of China (51576042), Natural Science Foundation of Jiangsu (BK20160672), Fundamental Research Funds for the Central Universities, the Foundation of Graduate Creative Program of Jiangsu (KYLX16-0200), and the Scholarship Award for Excellent Doctoral Student granted to the first author by the Ministry of Education and China Scholarship Council for financial support of this research.
© 2017 Hydrogen Energy Publications LLC
- CO capture
- Hydrogen production