The Impact of Ce-Zr Addition on Nickel Dispersion and Catalytic Behavior for C[O.sub.2] Methanation of Ni/AC Catalyst at Low Temperature

• Published in: Journal of chemistry 2017-01, Vol.2017
• Main Authors: Le, Minh Cam, Van, Khu Le, Nguyen, Thu Ha T, Nguyen, Ngoc Ha
• Format: Article
• Language: English
• Subjects: Carbon, Activated; Cerium; Chemical research; Metal catalysts; Thermal properties; Zirconium oxide
• ISSN: 2090-9063
• DOI: 10.1155/2017/4361056

The C[O.sub.2] methanation was studied over 7 wt.% nickel supported on [Ce.sub.0.2][Zr.sub.0.8][O.sub.2]/AC to evaluate the correlation of the structural properties with catalytic performance. The catalysts were investigated in more detail by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). A sample of 7 wt.% nickel loading supported on activated carbon (AC) was also prepared for comparison. The results demonstrated that the ceria-zirconia solid solution phase could disperse and stabilize the nickel species more effectively and resulted in stronger interaction with nickel than the parent activated carbon phase. Therefore, 7% Ni/[Ce.sub.0.2][Zr.sub.0.8][O.sub.2]/AC catalyst exhibited higher activity for C[O.sub.2] reduction than 7% Ni//AC. It can attain 85% C[O.sub.2] conversion at 350[degrees]C and have a C[H.sub.4] selectivity of 100% at a pressure as low as 1 atm. The high activity of prepared catalysts is attributed to the good interaction between Ni and [Ce.sub.0.2][Zr.sub.0.8][O.sub.2] and the high C[O.sub.2] adsorption capacity of the activated carbon as well.