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Title: EXAFS and FT-IR characterization of Mn and Li promoted titania-supported Rh Catalysts for CO Hydrogenation

Abstract

The effect of Li and Mn promoters on the structure and selectivity of supported Rh catalysts on CO hydrogenation reaction was examined. Infrared spectroscopy and X-ray absorption were used to investigate the adsorption of reactants and local structure of Rh. These techniques were used in combination with reactivity and temperature programmed studies to correlate structural characteristics with activity and selectivity during CO hydrogenation of the unpromoted Rh/TiO2 and three promoted Rh catalysts: Rh-Li/TiO2, Rh-Mn/TiO2, and Rh-Li-Mn/TiO2. The presence of a promoter slightly decreases the Rh clusters size, however no evidence for an electronic effect induced by the presence of Li and Mn was found. The Li promoter introduces a weakened CO adsorption site that appears to enhance the selectivity to C2+ oxygenates. The selectivity to these products varies inversely with the reducibility of Rh metal, i.e., the lower the reducibility, the higher the selectivity.

Authors:
 [1];  [2];  [2];  [2]
  1. ORNL
  2. Louisiana State University
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
1038782
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 1; Journal Issue: 10; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION; ADSORPTION; CATALYSTS; HYDROGENATION; PROMOTERS; SPECTROSCOPY

Citation Formats

Schwartz, Viviane, Egbebi, Adefemi, Campos, Andrew, Spivey, James J, and Overbury, Steven. EXAFS and FT-IR characterization of Mn and Li promoted titania-supported Rh Catalysts for CO Hydrogenation. United States: N. p., 2011. Web. doi:10.1021/cs200281g.
Schwartz, Viviane, Egbebi, Adefemi, Campos, Andrew, Spivey, James J, & Overbury, Steven. EXAFS and FT-IR characterization of Mn and Li promoted titania-supported Rh Catalysts for CO Hydrogenation. United States. https://doi.org/10.1021/cs200281g
Schwartz, Viviane, Egbebi, Adefemi, Campos, Andrew, Spivey, James J, and Overbury, Steven. 2011. "EXAFS and FT-IR characterization of Mn and Li promoted titania-supported Rh Catalysts for CO Hydrogenation". United States. https://doi.org/10.1021/cs200281g.
@article{osti_1038782,
title = {EXAFS and FT-IR characterization of Mn and Li promoted titania-supported Rh Catalysts for CO Hydrogenation},
author = {Schwartz, Viviane and Egbebi, Adefemi and Campos, Andrew and Spivey, James J and Overbury, Steven},
abstractNote = {The effect of Li and Mn promoters on the structure and selectivity of supported Rh catalysts on CO hydrogenation reaction was examined. Infrared spectroscopy and X-ray absorption were used to investigate the adsorption of reactants and local structure of Rh. These techniques were used in combination with reactivity and temperature programmed studies to correlate structural characteristics with activity and selectivity during CO hydrogenation of the unpromoted Rh/TiO2 and three promoted Rh catalysts: Rh-Li/TiO2, Rh-Mn/TiO2, and Rh-Li-Mn/TiO2. The presence of a promoter slightly decreases the Rh clusters size, however no evidence for an electronic effect induced by the presence of Li and Mn was found. The Li promoter introduces a weakened CO adsorption site that appears to enhance the selectivity to C2+ oxygenates. The selectivity to these products varies inversely with the reducibility of Rh metal, i.e., the lower the reducibility, the higher the selectivity.},
doi = {10.1021/cs200281g},
url = {https://www.osti.gov/biblio/1038782}, journal = {Journal of Catalysis},
issn = {0021-9517},
number = 10,
volume = 1,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2011},
month = {Sat Jan 01 00:00:00 EST 2011}
}