Correlating the degree of metal-promoter interaction to ethanol selectivity over MnRh/CNTs CO hydrogenation catalysts

Jingjing Liu, Zhao Guo, David Childers, Neil Schweitzer, Christopher L. Marshall, Robert F. Klie, Jeffrey T. Miller, Randall J. Meyer*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Multi-walled carbon nanotubes (MCNTs) were used as a support for Rh-based catalysts for high pressure (20 bar) CO hydrogenation. 3 wt% Rh/CNTs catalysts were loaded with 1 wt% and 2 wt% Mn promoter, respectively, in order to study the effect of metal-promoter interactions for ethanol synthesis. Both STEM and EXAFS results showed ∼1 nm Rh particles in promoted as well as the unpromoted catalysts, STEM and EELS results verified the enhanced metal-promoter interaction when the amount of Mn promoter increased from 1 wt% to 2 wt%. The enhancement in the degree of metal-promoter interaction leads to an increase in the ethanol selectivity. Moreover, due to the nature of CNTs (low Z number), the Mn-Rh interactions could be observed at atomic resolution during the STEM-EELS characterization, and the promoter phase is confirmed as Mn(II) oxide by XANES and EELS.

Original languageEnglish (US)
Pages (from-to)149-158
Number of pages10
JournalJournal of Catalysis
Volume313
DOIs
StatePublished - May 2014

Keywords

  • Alcohol synthesis
  • CO hydrogenation
  • Carbon nanotubes
  • Manganese promoter
  • Rhodium
  • STEM-EELS

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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