TY  - JOUR
TI  - Highly active Pd catalysts supported on surface-modified cobalt-nickel
mixed oxides for low temperature oxidation of lean methane
ID  - eprints17363
PB  - Elsevier
A1  - Li, Cunshuo
A1  - Li, Wenzhi
A1  - Chen, Kun
A1  - Ogunbiyi, Ajibola T
A1  - Zhou, Zean
A1  - Duan, Qiuyan
A1  - Xue, Fengyang
AV  - public
N2  - A highly active palladium catalyst supported on SiO2-modified cobalt-nickel mixed oxide (denoted as 0.5Pd/MCo1Ni4)
was prepared and used for lean methane combustion. It was found that such a surface modification
strategy enhanced the synergistic interaction between deposited palladium phase and reactive cobalt-nickel
oxide, leading to substantial improvement in performance towards methane combustion. Over 0.5Pd/M-Co1Ni4,
90% methane conversion was realized at 323? and a space velocity of 60,000 mLg?1 h?1, which is 62 °C lower
than that required for its untreated counterpart, 0.5Pd/Co1Ni4. The results of XRD, TEM, transmission FTIR and
XPS demonstrated that the introduced SiO2, which was presented as an amorphous phase covering the carrier
surface, could effectively tune the electronic structure of both Co1Ni4 support and palladium entities. More
importantly, H2-TPR and O2-TPD results of 0.5Pd/M-Co1Ni4 revealed that the presence of SiO2 could enhance
the low-temperature redox capability and increase the supply of oxygen species during the reaction process. We
believe that the combination of PdOx (1 < x < 2) phase and modified Co1Ni4 oxide with low Co3+/Co2+ ratio
was responsible for such an excellent performance of 0.5Pd/M-Co1Ni4. This work provides a feasible method for
the design of efficient CCM catalysts with reduced palladium content by maximizing the palladium species and
reactive host materials.
KW  - Palladium
Cobalt-nickel mixed oxides
Surface modification
Synergistic interaction
Lean methane combustion
Y1  - 2020///
JF  - Fuel
UR  - http://eprints.covenantuniversity.edu.ng/17363/
ER  -