Evidence for anchoring and partial occlusion of metallic clusters on the pore walls of MCM-41 and effect on the stability of the metallic clusters

Sangyun Lim, Chuan Wang, Yanhui Yang, Dragos Ciuparu, Lisa Pfefferle, Gary L. Haller

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

In order to explain the high stability of the Co- and Ni-MCM-41 catalysts, the hypotheses of anchoring of small metallic clusters to cations in and partial occlusion of the metallic clusters by amorphous silica are proposed. Carbon monoxide chemisorption on model catalysts and Co-MCM-41 has given direct proof of the metal anchoring effect on the stability of metal cluster dispersion. The partial occlusion of metallic clusters, which may lead to physical confinement (inhibited migration) or chemical confinement (inhibited reaction), was monitored by CO in situ FTIR and CO methanation along with a kinetic study, which confirmed that the metallic clusters on the pore surface result in the stabilization of the catalysts against deactivation. A fine tuning of these physicochemical phenomena in the transition metal incorporated MCM-41 will make possible the design of stable catalytic systems for reactions requiring metallic active sites under severe reaction conditions.

Original languageEnglish
Pages (from-to)122-132
Number of pages11
JournalCatalysis Today
Volume123
Issue number1-4
DOIs
StatePublished - 30 May 2007
Externally publishedYes

Keywords

  • Active site stability
  • Anchoring
  • CO chemisorption
  • CO methanation
  • Co-MCM-41
  • In situ CO FTIR
  • Kinetic study
  • Ni-MCM-41
  • Occlusion
  • TEM
  • TPR

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