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

doi:10.1016/j.jcat.2014.03.002

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

Chemical and Biological Engineering

Research output: Contribution to journal › Article

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 language	English (US)
Pages (from-to)	149-158
Number of pages	10
Journal	Journal of Catalysis
Volume	313
DOIs	https://doi.org/10.1016/j.jcat.2014.03.002
State	Published - 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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Liu, J., Guo, Z., Childers, D., Schweitzer, N., Marshall, C. L., Klie, R. F., Miller, J. T., & Meyer, R. J. (2014). Correlating the degree of metal-promoter interaction to ethanol selectivity over MnRh/CNTs CO hydrogenation catalysts. Journal of Catalysis, 313, 149-158. https://doi.org/10.1016/j.jcat.2014.03.002

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

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.",

keywords = "Alcohol synthesis, CO hydrogenation, Carbon nanotubes, Manganese promoter, Rhodium, STEM-EELS",

author = "Jingjing Liu and Zhao Guo and David Childers and Neil Schweitzer and Marshall, {Christopher L.} and Klie, {Robert F.} and Miller, {Jeffrey T.} and Meyer, {Randall J.}",

year = "2014",

month = may,

doi = "10.1016/j.jcat.2014.03.002",

language = "English (US)",

volume = "313",

pages = "149--158",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

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Correlating the degree of metal-promoter interaction to ethanol selectivity over MnRh/CNTs CO hydrogenation catalysts. / Liu, Jingjing; Guo, Zhao; Childers, David; Schweitzer, Neil; Marshall, Christopher L.; Klie, Robert F.; Miller, Jeffrey T.; Meyer, Randall J.

In: Journal of Catalysis, Vol. 313, 05.2014, p. 149-158.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Correlating the degree of metal-promoter interaction to ethanol selectivity over MnRh/CNTs CO hydrogenation catalysts

AU - Liu, Jingjing

AU - Guo, Zhao

AU - Childers, David

AU - Schweitzer, Neil

AU - Marshall, Christopher L.

AU - Klie, Robert F.

AU - Miller, Jeffrey T.

AU - Meyer, Randall J.

PY - 2014/5

Y1 - 2014/5

N2 - 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.

AB - 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.

KW - Alcohol synthesis

KW - CO hydrogenation

KW - Carbon nanotubes

KW - Manganese promoter

KW - Rhodium

KW - STEM-EELS

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