Catalytic performance of Pd–NiCo2O4/SiO2 in lean methane combustion at low temperature. Issue 5 (October 2018)

• Record Type: Journal Article
• Authors: Huang, Qifu; Li, Wenzhi; Lin, Qizhao; Zheng, Xusheng; Pan, Haibin; Pi, Dong; Shao, Chunyu; Hu, Chao; Zhang, Haitao
• Is Part Of: Journal of the Energy Institute. Volume 91:Issue 5(2018)
• Page Start: 733
• Page End: 742
• Publication Date: 2018-10
• Subjects: Palladium -- Nickel cobaltite -- Methane -- Oxidation -- Catalytic combustion; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2017.05.008
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: In this paper, the catalyst of Pd–NiCo2 O4 /SiO2 was prepared and applied to the catalytic combustion of lean methane. Pd and NiCo2 O4 nanoparticles were uniformly distributed on the SiO2 support, so that every Pd or NiCo2 O4 nanoparticle was separated from each other by another component. Comparing with Co3 O4 /SiO2, NiCo2 O4 /SiO2, Pd–Co3 O4 /SiO2 and Pd#NiCo2 O4 /SiO2 (catalysts without uniform distribution of Pd and NiCo2 O4 nanoparticles), Pd–NiCo2 O4 /SiO2 had the highest catalytic activity in the catalytic combustion of lean methane, with a methane total conversion temperature at 378 °C. In addition, the high activity did not decrease during the long time reaction, which showed good thermal stability. TEM and BET results showed that the nanoparticle sizes of Pd and NiCo2 O4 were very small. The XRD patterns indicated that the Pd nanoparticles were highly dispersed on the surface of SiO2 . The XPS spectra demonstrated the formation of NiCO2 O4, the presence of enough active oxygen species on the catalyst surface and the high ratio of PdO/Pd 0 . The enhanced influence of Ni introduction was also proved by comparison tests. All these results indicated that the high catalytic activity of Pd–NiCo2 O4 /SiO2 mainly comes from the nanoparticle distribution and the Ni cation enhancement. Graphical abstract: Highlights: Pd–NiCo2 O4 /SiO2 catalyst was applied to the catalytic combustion of lean methane. Every Pd or NiCo2 O4 nanoparticle separated from each other by another component. The methane can be fully oxidized by Pd–NiCo2 O4 /SiO2 at 378 °C. Benefit from the mutual separation of Pd and NiCo2 O4, the stability was high.