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Journal of Materials Science

, Volume 54, Issue 6, pp 4495–4510 | Cite as

Effect of surface and bulk palladium doping on the catalytic activity of La2Sn2O7 pyrochlore oxides for diesel soot oxidation

  • Lijie Ai
  • Zhongpeng WangEmail author
  • Yibo Gao
  • Chenchen Cui
  • Baoqin Wang
  • Wei Liu
  • Liguo Wang
Ceramics
  • 187 Downloads

Abstract

The soot combustion on Pd-doped La2Sn2O7 pyrochlore oxides was studied. Palladium promoter was doped into the pyrochlore system via two ways: bulk substitution (La2Sn1.9Pd0.1O7) and surface impregnation (Pd/La2Sn2O7). The catalysts were characterized by XRD, BET, SEM, HRTEM, PL, XPS and H2-TPR measurements. Pd modifications increased the concentration of surface oxygen vacancy, especially Pd/La2Sn2O7. The different morphologies of palladium promoters were revealed in the two palladium-doped catalysts. Palladium was present primarily in the form of a lattice Pd2+ in the bulk-doping sample, with trace of metal palladium deposited on the surface. As for the surface-doping sample, PdO was the predominant form, accompanied with some of highly dispersed metallic palladium. Due to the adhesion of massive surface palladium species on Pd/La2Sn2O7, a strong metal oxide interaction occurred in the interface between Pd species and La2Sn2O7. The activity evaluation results show that Pd/La2Sn2O7 possesses the highest performance, exhibiting the lowest activation energy (98.83 kJ/mol) for soot combustion. Surface Pd/PdO redox couples as well as Pd–O–Sn interface species were identified to be the active phases for the superior catalytic behavior of Pd/La2Sn2O7. A possible oxidation mechanism for the reactions has been speculated.

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 21777055), Shandong Provincial Natural Science Foundation (ZR2017BB004), Shandong Province Key Research and Development Plan (2017GGX202004) and Shandong Province Major Science and Technology Innovation Project (2017CXGC1004).

Supplementary material

10853_2018_3160_MOESM1_ESM.docx (1.3 mb)
Supplementary material 1 (DOCX 1297 kb)

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Authors and Affiliations

  1. 1.Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, School of Water Resources and EnvironmentUniversity of JinanJinanPeople’s Republic of China

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