Synthesis of a Highly Stable Pd@CeO2 Catalyst
for Methane Combustion with the Synergistic Effect of Urea and Citric
Acid
Posted on 2018-12-06 - 09:14
Making use of synergy between urea
and citric acid, a core–shell
Pd@CeO2 catalyst with spherical morphology was facilely
synthesized by a hydrothermal method. The formation mechanism of the
core–shell structure in the presence of citric acid and hydrogen
peroxide was studied. Results showed that the Pd@CeO2 catalyst
exhibited high catalytic activity in methane oxidation. Pd nanoparticles
were well stabilized by CeO2 shell encapsulation, resulting
in high stability of the catalyst. A high CH4 conversion
of 99% was retained after 50 h on-stream reaction at 500 °C.
Additionally, many tiny pores on the CeO2 shell surface
were beneficial for the full contact between reactants and active
components. Pd nanoparticles were highly dispersed inside the shell,
improving the utilization efficiency of active components. The results
also demonstrated that the Pd species in the catalyst existed in the
form of oxidation state, mainly in PdO (ca. 66.6%), which played an
essential part in methane combustion.
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Cai, Guohui; Luo, Wei; Xiao, Yihong; Zheng, Yong; Zhong, Fulan; Zhan, Yingying; et al. (2018). Synthesis of a Highly Stable Pd@CeO2 Catalyst
for Methane Combustion with the Synergistic Effect of Urea and Citric
Acid. ACS Publications. Collection. https://doi.org/10.1021/acsomega.8b02556
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AUTHORS (7)
GC
Guohui Cai
WL
Wei Luo
YX
Yihong Xiao
YZ
Yong Zheng
FZ
Fulan Zhong
YZ
Yingying Zhan
LJ
Lilong Jiang