Influences of Ni/CeO2 morphologies on steam reforming for acetic acid-a model compound of bio-oil

Steam reforming for bio-oil and its derivatives is a highly promising method for hydrogen production. The development of low-price, highly active and stable catalysts is crucial for this technology. The Ni/CeO2 with three morphologies were prepared in this work. The obvious differences in surface defects and oxygen vacancy concentrations of catalysts with different morphologies were confirmed by Raman and XPS. The Ni/CeO2-R with the highest surface defects and oxygen vacancy concentrations possessed the greatest catalytic performance. The highest hydrogen yield (72.01 %) and carbon conversion rate (86.61 %) were achieved over Ni/CeO2-R at 600 degrees C with the complete conversation of acetic acid. In addition, Ni/CeO2-R possessed the lowest apparent activation energy, the highest hydrogen production rate, and turnover frequency within 400-600 degrees C. More importantly, Ni/ CeO2-R maintained stability during a 15-h durability test. This work would provide references for the design of catalysts for SRAA in the future.