Temperature-programmed surface reaction (TPSR) of CH 4 synthesis by Pd x Ni 100-x nanoparticles

Kuan Wen Wang, Shu Ru Chung, Yu Chen Wei, Jyh Fu Lee, Tsong P. Perng

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A series of Pd x Ni 100-x nanoparticles were prepared by the co-precipitation method and analyzed using a temperature-programmed surface reaction (TPSR) of their methanation reactions. ESCA measurement suggested that the as-prepared Pd-Ni alloys had Pd-core/Ni-shell structure. Surface Pd segregation occurred during H 2 reduction and resulted in a surface composition close to the nominal value. The TPSR experiments were performed by pre-adsorption of CO with H 2 to form methane. The peak temperature of methanation increased as Pd content increased, indicating that a methanation reaction is favored on Ni and Ni-rich alloy nanoparticles. For physical mixtures of Pd and Ni nanoparticles, methanation behaviors is similar to those of alloy nanoparticles; but the methanation temperatures of physical mixtures are always higher than those of alloy nanoparticles. This may be due to the formation of a Pd-enriched alloy surface layer during reduction in H 2 at 400 °C, or because the CO molecules adsorbed on the Pd sites spill over onto the Ni sites for methanation. Using TPSR technique and measuring methanation temperature, the top-most surface of such bimetallic nanoparticles can be probed.

Original languageEnglish
Pages (from-to)5802-5805
Number of pages4
JournalApplied Surface Science
Issue number11
StatePublished - 15 Mar 2009


  • Methanation
  • Pd Ni nanoparticles
  • Surface composition
  • Surface segregation
  • Temperature-programmed surface reaction


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