Kinetics and mechanisms of CO oxidation on Nd1-xSrxCoO3-y catalysts with static and flow methods

Ha Jun Jung, Jong Tae Lim, Sung Han Lee, Yong Rok Kim, Joong-Gill Choi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Perovskite-type Nd1-xSrxCoO3-y catalysts with various Sr mole fraction were prepared and investigated for the effect of Sr substitution on their catalytic activities in the oxidation of carbon monoxide. Utilizing the static and flow methods, kinetic studies have been carried out between 373 and 523 K. The initial reaction was investigated by the static reactor system using a differential photoacoustic cell, and for the study of reaction stage showing a constant catalytic activity after an initial stage characterized by high reaction rates, the flow reactor system using on-line gas chromatography was employed. The catalytic activity increased with increasing amounts of Sr substitution for Nd in NdCoO3 compounds, and it also increased with higher reaction temperature within the range of 373-523 K. Kinetic data obtained in an initial reaction stage by CO2 photoacoustic spectroscopy showed that the reaction partial orders to CO and O2 were 0.8-0.9 and 0, respectively. In the reaction stage showing a constant catalytic activity after an initial stage, the oxidation was found to be first order with respect to CO and 0.5 order with respect to O2. The concentration of oxygen vacancy in the solid catalyst was shown to be the controlling factor for the oxidation of carbon monoxide. According to the experimental results, the mechanisms of the CO oxidation processes are discussed, and it is believed that O2 adsorbs on the oxygen vacancies (Vox) formed by Sr substitution while CO adsorbs on the lattice oxygens during the reaction process.

Original languageEnglish
Pages (from-to)10243-10248
Number of pages6
JournalJournal of Physical Chemistry
Volume100
Issue number24
Publication statusPublished - 1996 Jun 13

Fingerprint

Carbon Monoxide
Catalyst activity
catalysts
Oxidation
oxidation
Catalysts
Kinetics
Substitution reactions
kinetics
Oxygen vacancies
catalytic activity
Carbon monoxide
Photoacoustic spectroscopy
substitutes
Online systems
Photoacoustic effect
carbon monoxide
Gas chromatography
Perovskite
oxygen

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

@article{22157308c220427ba7bad579de9df952,
title = "Kinetics and mechanisms of CO oxidation on Nd1-xSrxCoO3-y catalysts with static and flow methods",
abstract = "Perovskite-type Nd1-xSrxCoO3-y catalysts with various Sr mole fraction were prepared and investigated for the effect of Sr substitution on their catalytic activities in the oxidation of carbon monoxide. Utilizing the static and flow methods, kinetic studies have been carried out between 373 and 523 K. The initial reaction was investigated by the static reactor system using a differential photoacoustic cell, and for the study of reaction stage showing a constant catalytic activity after an initial stage characterized by high reaction rates, the flow reactor system using on-line gas chromatography was employed. The catalytic activity increased with increasing amounts of Sr substitution for Nd in NdCoO3 compounds, and it also increased with higher reaction temperature within the range of 373-523 K. Kinetic data obtained in an initial reaction stage by CO2 photoacoustic spectroscopy showed that the reaction partial orders to CO and O2 were 0.8-0.9 and 0, respectively. In the reaction stage showing a constant catalytic activity after an initial stage, the oxidation was found to be first order with respect to CO and 0.5 order with respect to O2. The concentration of oxygen vacancy in the solid catalyst was shown to be the controlling factor for the oxidation of carbon monoxide. According to the experimental results, the mechanisms of the CO oxidation processes are discussed, and it is believed that O2 adsorbs on the oxygen vacancies (Vox) formed by Sr substitution while CO adsorbs on the lattice oxygens during the reaction process.",
author = "Jung, {Ha Jun} and Lim, {Jong Tae} and Lee, {Sung Han} and Kim, {Yong Rok} and Joong-Gill Choi",
year = "1996",
month = "6",
day = "13",
language = "English",
volume = "100",
pages = "10243--10248",
journal = "Journal of Physical Chemistry",
issn = "0022-3654",
publisher = "American Chemical Society",
number = "24",

}

Kinetics and mechanisms of CO oxidation on Nd1-xSrxCoO3-y catalysts with static and flow methods. / Jung, Ha Jun; Lim, Jong Tae; Lee, Sung Han; Kim, Yong Rok; Choi, Joong-Gill.

In: Journal of Physical Chemistry, Vol. 100, No. 24, 13.06.1996, p. 10243-10248.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Kinetics and mechanisms of CO oxidation on Nd1-xSrxCoO3-y catalysts with static and flow methods

AU - Jung, Ha Jun

AU - Lim, Jong Tae

AU - Lee, Sung Han

AU - Kim, Yong Rok

AU - Choi, Joong-Gill

PY - 1996/6/13

Y1 - 1996/6/13

N2 - Perovskite-type Nd1-xSrxCoO3-y catalysts with various Sr mole fraction were prepared and investigated for the effect of Sr substitution on their catalytic activities in the oxidation of carbon monoxide. Utilizing the static and flow methods, kinetic studies have been carried out between 373 and 523 K. The initial reaction was investigated by the static reactor system using a differential photoacoustic cell, and for the study of reaction stage showing a constant catalytic activity after an initial stage characterized by high reaction rates, the flow reactor system using on-line gas chromatography was employed. The catalytic activity increased with increasing amounts of Sr substitution for Nd in NdCoO3 compounds, and it also increased with higher reaction temperature within the range of 373-523 K. Kinetic data obtained in an initial reaction stage by CO2 photoacoustic spectroscopy showed that the reaction partial orders to CO and O2 were 0.8-0.9 and 0, respectively. In the reaction stage showing a constant catalytic activity after an initial stage, the oxidation was found to be first order with respect to CO and 0.5 order with respect to O2. The concentration of oxygen vacancy in the solid catalyst was shown to be the controlling factor for the oxidation of carbon monoxide. According to the experimental results, the mechanisms of the CO oxidation processes are discussed, and it is believed that O2 adsorbs on the oxygen vacancies (Vox) formed by Sr substitution while CO adsorbs on the lattice oxygens during the reaction process.

AB - Perovskite-type Nd1-xSrxCoO3-y catalysts with various Sr mole fraction were prepared and investigated for the effect of Sr substitution on their catalytic activities in the oxidation of carbon monoxide. Utilizing the static and flow methods, kinetic studies have been carried out between 373 and 523 K. The initial reaction was investigated by the static reactor system using a differential photoacoustic cell, and for the study of reaction stage showing a constant catalytic activity after an initial stage characterized by high reaction rates, the flow reactor system using on-line gas chromatography was employed. The catalytic activity increased with increasing amounts of Sr substitution for Nd in NdCoO3 compounds, and it also increased with higher reaction temperature within the range of 373-523 K. Kinetic data obtained in an initial reaction stage by CO2 photoacoustic spectroscopy showed that the reaction partial orders to CO and O2 were 0.8-0.9 and 0, respectively. In the reaction stage showing a constant catalytic activity after an initial stage, the oxidation was found to be first order with respect to CO and 0.5 order with respect to O2. The concentration of oxygen vacancy in the solid catalyst was shown to be the controlling factor for the oxidation of carbon monoxide. According to the experimental results, the mechanisms of the CO oxidation processes are discussed, and it is believed that O2 adsorbs on the oxygen vacancies (Vox) formed by Sr substitution while CO adsorbs on the lattice oxygens during the reaction process.

UR - http://www.scopus.com/inward/record.url?scp=0000679879&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000679879&partnerID=8YFLogxK

M3 - Article

VL - 100

SP - 10243

EP - 10248

JO - Journal of Physical Chemistry

JF - Journal of Physical Chemistry

SN - 0022-3654

IS - 24

ER -