Nanostructured Ru-Co@SiO2: Highly efficient yet durable for CO2 reforming of methane with a desirable H2/CO ratio

Yijun Pang, Yixuan Dou, Aihua Zhong, Wu Jiang, Lingli Gu, Xinzhen Feng, Weijie Ji*, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

In this study, the nanostructured bimetallic Ru-Co catalysts (Ru-Co core particles of ca. 50 nm; SiO2 sell thickness of 6.1 nm, and nRu/nCo = 0.008) were fabricated through the hydrothermal (or impregnation) and modified Stöber processes. The developed catalysts were characterized by means of XRD, N2 sorption, TEM, XPS, TG-MS, and H2-TPR, and evaluated for CO2 reforming of methane to syngas, to establish a detailed structure-performance correlation. The strategy of catalyst design effectively reduced metal sintering at reaction temperatures. Uniform Ru distribution through a hydrothermal approach resulted in more direct Co-Ru interaction, which caused the Co-based cores rather coking- and oxidation-resistant, and induced a phase transformation of β-Co to α-Co under the reaction atmosphere, beneficial for the reaction. The silica shell porosity was modified by applying the CTAB and PVP surfactants in shell encapsulation. In terms of reaction temperature (700 °C), CH4 turnover frequency (84.3 s−1), H2/CO ratio (0.98), and carbon deposition rate (0.5 mgcoke gcat−1 h−1), the currently developed binary Ru-Co catalyst with uniform Ru distribution and improved SiO2 shell porosity is proved to be highly efficient yet durable with a desirable H2/CO ratio for the target reaction. In view of the unique features of catalyst material and the outstanding reaction performance on the basis of CH4 TOF, new insights into the Co-based catalyst for DRM are provided in the current work.

Original languageEnglish
Pages (from-to)27-35
Number of pages9
JournalApplied Catalysis A: General
Volume555
DOIs
Publication statusPublished - 5 Apr 2018

Scopus Subject Areas

  • Catalysis
  • Process Chemistry and Technology

User-Defined Keywords

  • Bimetallic
  • Cobalt
  • Methane dry reforming
  • Nano-structured catalyst
  • Ruthenium

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