Adsorption and reduction of NO on tin(IV) oxide doped with chromium(III) oxide

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Rates for NO chemisorption were measured on SnO2 containing small amounts of Cr2O3. Evaluation of the NO chemisorption rate was done by the Elovich equation. Very large increases in the rate and amount of adsorbed NO were obtained by adding 1% Cr2O3 to SnO2. It was found that preadsorbed NO promotes the adsorption of CO. Analyses of the gas-phase during the adsorption and thermal desorption measurements indicated that the extent of the dissociative adsorption of NO was greatly enhanced by adding Cr2O3 to SnO2. The catalytic reduction of NO with CO on pure SnO2 proceeded with reproducible rates and complete conversion only above 360 °C. Catalytic reaction was detected below 200 °C as well. The conversion of NO, however, was much less and the surface very soon became poisoned by CO. A marked increase in the efficiency of the catalyst was experienced when a small amount of Cr2O3 was incorporated into the SnO2. The reduction of NO with CO occurred with a complete conversion and well-measurable rates at 150-220 °C. CO exerted no poisoning effect at all. The high activity of SnO2 containing Cr2O3 is attributed to the chromium ions located in the surface layer of SnO2, which can easily be oxidized by NO and rapidly reduced by CO. A possible mechanism of the catalytic reduction of NO is discussed.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalJournal of Catalysis
Volume54
Issue number1
DOIs
Publication statusPublished - 1978

Fingerprint

Chromium
Carbon Monoxide
Tin oxides
Oxides
chromium
tin
Chemisorption
Adsorption
adsorption
oxides
Thermal desorption
chemisorption
poisoning
Catalysts
Ions
surface layers
Gases
desorption
vapor phases
catalysts

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Adsorption and reduction of NO on tin(IV) oxide doped with chromium(III) oxide. / Solymosi, F.; Kiss, J.

In: Journal of Catalysis, Vol. 54, No. 1, 1978, p. 42-51.

Research output: Contribution to journalArticle

@article{0f7ba695218a4edaac62f021ce481683,
title = "Adsorption and reduction of NO on tin(IV) oxide doped with chromium(III) oxide",
abstract = "Rates for NO chemisorption were measured on SnO2 containing small amounts of Cr2O3. Evaluation of the NO chemisorption rate was done by the Elovich equation. Very large increases in the rate and amount of adsorbed NO were obtained by adding 1{\%} Cr2O3 to SnO2. It was found that preadsorbed NO promotes the adsorption of CO. Analyses of the gas-phase during the adsorption and thermal desorption measurements indicated that the extent of the dissociative adsorption of NO was greatly enhanced by adding Cr2O3 to SnO2. The catalytic reduction of NO with CO on pure SnO2 proceeded with reproducible rates and complete conversion only above 360 °C. Catalytic reaction was detected below 200 °C as well. The conversion of NO, however, was much less and the surface very soon became poisoned by CO. A marked increase in the efficiency of the catalyst was experienced when a small amount of Cr2O3 was incorporated into the SnO2. The reduction of NO with CO occurred with a complete conversion and well-measurable rates at 150-220 °C. CO exerted no poisoning effect at all. The high activity of SnO2 containing Cr2O3 is attributed to the chromium ions located in the surface layer of SnO2, which can easily be oxidized by NO and rapidly reduced by CO. A possible mechanism of the catalytic reduction of NO is discussed.",
author = "F. Solymosi and J. Kiss",
year = "1978",
doi = "10.1016/0021-9517(78)90025-8",
language = "English",
volume = "54",
pages = "42--51",
journal = "Journal of Catalysis",
issn = "0021-9517",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Adsorption and reduction of NO on tin(IV) oxide doped with chromium(III) oxide

AU - Solymosi, F.

AU - Kiss, J.

PY - 1978

Y1 - 1978

N2 - Rates for NO chemisorption were measured on SnO2 containing small amounts of Cr2O3. Evaluation of the NO chemisorption rate was done by the Elovich equation. Very large increases in the rate and amount of adsorbed NO were obtained by adding 1% Cr2O3 to SnO2. It was found that preadsorbed NO promotes the adsorption of CO. Analyses of the gas-phase during the adsorption and thermal desorption measurements indicated that the extent of the dissociative adsorption of NO was greatly enhanced by adding Cr2O3 to SnO2. The catalytic reduction of NO with CO on pure SnO2 proceeded with reproducible rates and complete conversion only above 360 °C. Catalytic reaction was detected below 200 °C as well. The conversion of NO, however, was much less and the surface very soon became poisoned by CO. A marked increase in the efficiency of the catalyst was experienced when a small amount of Cr2O3 was incorporated into the SnO2. The reduction of NO with CO occurred with a complete conversion and well-measurable rates at 150-220 °C. CO exerted no poisoning effect at all. The high activity of SnO2 containing Cr2O3 is attributed to the chromium ions located in the surface layer of SnO2, which can easily be oxidized by NO and rapidly reduced by CO. A possible mechanism of the catalytic reduction of NO is discussed.

AB - Rates for NO chemisorption were measured on SnO2 containing small amounts of Cr2O3. Evaluation of the NO chemisorption rate was done by the Elovich equation. Very large increases in the rate and amount of adsorbed NO were obtained by adding 1% Cr2O3 to SnO2. It was found that preadsorbed NO promotes the adsorption of CO. Analyses of the gas-phase during the adsorption and thermal desorption measurements indicated that the extent of the dissociative adsorption of NO was greatly enhanced by adding Cr2O3 to SnO2. The catalytic reduction of NO with CO on pure SnO2 proceeded with reproducible rates and complete conversion only above 360 °C. Catalytic reaction was detected below 200 °C as well. The conversion of NO, however, was much less and the surface very soon became poisoned by CO. A marked increase in the efficiency of the catalyst was experienced when a small amount of Cr2O3 was incorporated into the SnO2. The reduction of NO with CO occurred with a complete conversion and well-measurable rates at 150-220 °C. CO exerted no poisoning effect at all. The high activity of SnO2 containing Cr2O3 is attributed to the chromium ions located in the surface layer of SnO2, which can easily be oxidized by NO and rapidly reduced by CO. A possible mechanism of the catalytic reduction of NO is discussed.

UR - http://www.scopus.com/inward/record.url?scp=0002542078&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002542078&partnerID=8YFLogxK

U2 - 10.1016/0021-9517(78)90025-8

DO - 10.1016/0021-9517(78)90025-8

M3 - Article

VL - 54

SP - 42

EP - 51

JO - Journal of Catalysis

JF - Journal of Catalysis

SN - 0021-9517

IS - 1

ER -