Ni-modified Mo 2C catalysts for methane dry reforming

Chuan Shi*, Anjie Zhang, Xiaosong Li, Shaohua Zhang, Aimin Zhu, Yufei Ma, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

82 Citations (Scopus)

Abstract

Dry reforming of methane with CO 2 (DRM) was studied over Ni-Mo 2C catalysts with Ni/Mo molar ratios of 1/3, 1/2, and 1/1 (denoted as Ni-Mo 2C (1/3), Ni-Mo 2C (1/2), and Ni-Mo 2C (1/1), respectively) aiming to investigate the catalytic roles of Ni and the carbide. The results of XRD and XPS characterizations indicated that the carbonization process was promoted by the presence of Ni. The CH 4-TPR and CO 2-TPO over the fresh samples proved that CH 4 dissociation was greatly enhanced by Ni. The Ni-Mo 2C (1/2) catalyst showed the best catalytic activity and stability for CH 4/CO 2 (1/1) dry reforming. Above 80% of CH 4 and CO 2 conversions were maintained at 800 °C during a test run of 20 h at W/F = 0.3 g s cm -3. Characterizations of the spent samples revealed that the deactivation of Ni-Mo 2C (1/1) was due to coke formation whereas that of Ni-Mo 2C (1/3) was due to bulk oxidation of Mo 2C into MoO 2. Only at a Ni/Mo molar ratio of 1/2, a catalytic oxidation-reduction cycle could be established. It was suggested that Ni-Mo 2C was a typical bi-functional catalyst. In CH 4/CO 2 dry reforming, the dissociation of CH 4 was catalyzed by Ni, while the activation of CO 2 took place on Mo 2C. By regulating the molar ratio of Ni and Mo 2C, a catalytic redox cycle could be established.

Original languageEnglish
Pages (from-to)164-170
Number of pages7
JournalApplied Catalysis A: General
Volume431-432
DOIs
Publication statusPublished - 26 Jul 2012

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

  • Carbon dioxide
  • Dry reforming
  • Methane
  • Molybdenum carbide
  • Nickel

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