10.1021/acsomega.8b02556.s001
Guohui Cai
Guohui
Cai
Wei Luo
Wei
Luo
Yihong Xiao
Yihong
Xiao
Yong Zheng
Yong
Zheng
Fulan Zhong
Fulan
Zhong
Yingying Zhan
Yingying
Zhan
Lilong Jiang
Lilong
Jiang
Synthesis of a Highly Stable Pd@CeO<sub>2</sub> Catalyst
for Methane Combustion with the Synergistic Effect of Urea and Citric
Acid
American Chemical Society
2018
CeO 2 shell surface
50 h on-stream reaction
CeO 2 shell encapsulation
catalyst
CH 4 conversion
Pd nanoparticles
2018-12-06 09:14:18
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Synthesis_of_a_Highly_Stable_Pd_CeO_sub_2_sub_Catalyst_for_Methane_Combustion_with_the_Synergistic_Effect_of_Urea_and_Citric_Acid/7429019
Making use of synergy between urea
and citric acid, a core–shell
Pd@CeO<sub>2</sub> 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@CeO<sub>2</sub> catalyst
exhibited high catalytic activity in methane oxidation. Pd nanoparticles
were well stabilized by CeO<sub>2</sub> shell encapsulation, resulting
in high stability of the catalyst. A high CH<sub>4</sub> conversion
of 99% was retained after 50 h on-stream reaction at 500 °C.
Additionally, many tiny pores on the CeO<sub>2</sub> 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.